Linksys Network Router WRT54GX4 User Manual
®
A Division of Cisco Systems, Inc.  
2.4GHz  
802.11g  
Wireless-G  
Broadband Router  
User Guide  
WIRELESS  
with SRX400  
Model No.  
WRT54GX4  
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Wireless-G Broadband Router with SRX400  
Table of Contents  
Chapter 1: Introduction  
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1
Welcome  
What’s in this Guide?  
2
Chapter 2: Planning Your Wireless Network  
Network Topology  
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4
Ad-Hoc versus Infrastructure Mode  
Network Layout  
Chapter 3: Getting to Know the Wireless-G Broadband Router with SRX400  
The Router’s Ports and Reset Button  
The Router’s LEDs  
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6
7
Chapter 4: Connecting the Wireless-G Broadband Router with SRX400  
Overview  
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8
8
9
Hardware Installation for Connection to Your Broadband Modem  
Placement Options  
Chapter 5: Configuring the Wireless-G Broadband Router  
Overview  
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The Setup Tab - Basic Setup  
The Setup Tab - DDNS  
The Setup Tab - MAC Address Clone  
The Setup Tab - Advanced Routing  
The Wireless Tab - Basic Wireless Settings  
The Wireless Tab - Wireless Security  
The Wireless Tab - Wireless MAC Filter  
The Wireless Tab - Advanced Wireless Settings  
The Security Tab - Firewall  
The Access Restrictions Tab - Internet Access  
The Applications and Gaming Tab - Port Range Forward  
The Applications and Gaming Tab - Port Triggering  
The Applications and Gaming Tab - DMZ  
The Applications and Gaming Tab - QoS  
The Administration Tab - Management  
The Administration Tab - Log  
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The Administration Tab - Diagnostics  
The Administration Tab - Factory Defaults  
The Administration Tab - Firmware Upgrade  
The Administration Tab - Config Management  
The Status Tab - Router  
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The Status Tab - Local Network  
The Status Tab - Wireless  
The Status Tab - System Performance  
Appendix A: Troubleshooting  
Common Problems and Solutions  
Frequently Asked Questions  
Appendix B: Wireless Security  
Security Precautions  
Security Threats Facing Wireless Networks  
Appendix C: Upgrading Firmware  
Appendix D: Windows Help  
64  
Appendix E: Finding the MAC Address and IP Address for Your  
Ethernet Adapter  
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67  
Windows 98SE or Me Instructions  
Windows 2000 or XP Instructions  
For the Router’s Web-based Utility  
Appendix F: Glossary  
Appendix G: Specifications  
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81  
Appendix H: Warranty Information  
Appendix I: Regulatory Information  
Appendix J: Contact Information  
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List of Figures  
Figure 3-1: The Router’s Side Panel  
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Figure 3-2: The Router’s LEDs  
Figure 4-1: Connect a PC  
Figure 4-2: Connect the Modem  
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Figure 4-3: Connect the Power  
Figure 4-4: Router’s Stand  
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Figure 4-5: Wall-Mount Measurements  
Figure 5-1: Password Screen  
Figure 5-2: Setup Tab - Basic Setup  
Figure 5-3: DHCP Connection Type  
Figure 5-4: Static IP Connection Type  
Figure 5-5: PPPoE Connection Type  
Figure 5-6: PPTP Connection Type  
Figure 5-7: Telstra BigPond Connection Type  
Figure 5-8: Optional Settings  
Figure 5-9: Router IP  
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Figure 5-10: Network Address Server Settings  
Figure 5-11: Time Setting  
Figure 5-12: Setup Tab - DDNS  
Figure 5-13: Setup Tab - MAC Address Clone  
Figure 5-14: Setup Tab - Advanced Routing  
Figure 5-15: Setup Tab - Advanced Routing - NAT Mode  
Figure 5-16: Setup Tab - Advanced Routing - NAT Mode - Routing Table  
Figure 5-17: Wireless Tab - Basic Wireless Settings  
Figure 5-18: Wireless Tab - Wireless Security (WPA/WPA Personal)  
Figure 5-19: Wireless Tab - Wireless Security (WPA/WPA2 Enterprise)  
Figure 5-20: Wireless Tab - Wireless Security (WEP)  
Figure 5-21: Wireless Tab - Wireless MAC Filter  
Figure 5-22: Wireless MAC Filter - Networked Computers  
Figure 5-23: Wireless Tab - Advanced Wireless Settings  
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Figure 5-24: Security Tab - Firewall  
Figure 5-25: Access Restrictions Tab - Internet Access  
Figure 5-26: Internet Policy Summary  
Figure 5-27: List of PCs  
Figure 5-28: Port Services  
Figure 5-29: Applications and Gaming Tab - Port Range Forward  
Figure 5-30: Applications and Gaming Tab - Port Triggering  
Figure 5-31: Applications and Gaming Tab - DMZ  
Figure 5-32: Applications and Gaming Tab - QoS (Add a New Application  
Figure 5-33: QoS - Voice Device  
Figure 5-34: QoS - Online Game  
Figure 5-35: Administration Tab - Management  
Figure 5-36: Administration Tab - Log  
Figure 5-37: Administration Tab - Diagnostics  
Figure 5-38: Administration Tab - Factory Defaults  
Figure 5-39: Administration Tab - Firmware Upgrade  
Figure 5-40: Administration Tab - Config Management  
Figure 5-41: Status Tab - Router  
Figure 5-42: Status Tab - Local Network  
Figure 5-43: DHCP Active IP Table  
Figure 5-44: Status Tab - Wireless  
Figure 5-45: Status Tab - System Performance  
Figure C-1: Upgrade Firmware  
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Figure E-1: IP Configuration Screen  
Figure E-2: MAC Address/Adapter Address  
Figure E-3: MAC Address/Physical Address  
Figure E-4: MAC Address Clone  
Figure E-5: Wireless MAC Filter List  
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Wireless-G Broadband Router with SRX400  
Chapter 1: Introduction  
Welcome  
Thank you for choosing the Linksys Wireless-G Broadband Router with SRX400. The Router will allow you to  
network wirelessly better than ever, sharing Internet access, files and fun, easily and securely.  
How does the Router do all of this? A router is a device that allows access to an Internet connection over a  
network. When you use the Router, this access can be shared over the four switched ports or via the wireless  
network.  
mbps: one million bits per second; a unit of  
measurement for data transmission  
The Wireless-G Broadband Router with SRX400 combines smart antenna technology with standards-based  
Wireless-G (802.11g) networking. By overlaying the signals of two Wireless-G compatible radios, the “Multiple In,  
Multiple Out” (MIMO) technology effectively doubles the data rate. Unlike ordinary wireless networking  
technologies that are confused by signal reflections, MIMO actually uses these reflections to increase the range  
and reduce “dead spots” in the wireless coverage area. The robust signal travels farther, maintaining wireless  
connections up to 3 times farther than standard Wireless-G.  
browser: an application program that  
provides a way to look at and interact with all  
the information on the World Wide Web.  
lan (Local Area Network): The  
computers and networking products  
that make up the network in your home  
or office  
With SRX, the farther away you are, the more speed advantage you get, and SRX400 works great with standard  
Wireless-G and -B equipment, and other flavors of Linksys SRX. But when both ends of the wireless link are  
SRX400, the router can increase the throughput even more by using twice as much radio band, yielding speeds  
up to 10 times as fast as standard Wireless-G. But unlike other speed-enhanced technologies, SRX400 can  
dynamically enable this double-speed mode for SRX400 devices, while still connecting to non-SRX400 wireless  
devices at their respective fastest speeds. And SRX400 is a “good neighbor”, always checking for other wireless  
devices in the area before gobbling up the radio band.  
802.11b: an IEEE wireless networking standard  
that specifies a maximum data transfer rate of  
11Mbps and an operating frequency of 2.4GHz.  
In addition, the Router can encode all wireless transmissions with industrial-strength WPA encryption to help  
protect your data and privacy. The whole network is protected by a Stateful Packet Inspection (SPI) firewall and  
NAT technology. All of these security features, as well as full configurability, are accessed through the easy-to-  
use, browser-based utility.  
802.11g: an IEEE wireless networking standard  
that specifies a maximum data transfer rate of  
54Mbps, an operating frequency of 2.4GHz, and  
backward compatibility with 802.11b devices.  
But what does all of this mean?  
Networks are useful tools for sharing computer resources. You can access one printer from different computers  
and access data located on another computer's hard drive. Networks are even used for playing multiplayer video  
games. So, networks are not only useful in homes and offices, they can also be fun.  
Chapter 1: Introduction  
Welcome  
1
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PCs on a wired network create a Local Area Network. They are connected with Ethernet cables, which is why the  
network is called “wired”.  
PCs equipped with wireless cards or adapters can communicate without cumbersome cables. By sharing the  
same wireless settings, within their transmission radius, they form a wireless network. The Router bridges  
wireless networks of both 802.11b and 802.11g standards and wired networks, allowing them to communicate  
with each other.  
With your networks all connected, wired, wireless, and the Internet, you can now share files and Internet  
access—and even play games. All the while, the Router protects your networks from unauthorized and  
unwelcome users.  
You should always use the Setup CD-ROM when you first install the Router. If you do not wish to run the Setup  
Wizard on the Setup CD-ROM, then use the instructions in this Guide to help you connect the Router, set it up, and  
configure it to bridge your different networks. These instructions should be all you need to get the most out of the  
Wireless-G Broadband Router with SRX400.  
What’s in this Guide?  
This user guide covers the steps for setting up and using the Wireless-G Broadband Router with SRX400.  
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Chapter 1: Introduction  
This chapter describes the Router’s applications and this User Guide.  
Chapter 2: Planning Your Wireless Network  
This chapter describes the basics of wireless networking.  
Chapter 3: Getting to Know the Wireless-G Broadband Router with SRX400  
This chapter describes the Router’s physical features.  
Chapter 4: Connecting the Wireless-G Broadband Router with SRX400  
This chapter instructs you on how to connect the Router to your network.  
Chapter 5: Configuring the Wireless-G Broadband Router with SRX400  
This chapter explains how to use the Router’s Web-Based Utility.  
Appendix A: Troubleshooting  
This appendix describes some problems and solutions, as well as frequently asked questions, regarding  
installation and use of the Wireless-G Broadband Router.  
Chapter 1: Introduction  
What’s in this Guide?  
2
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Appendix B: Wireless Security  
This appendix explains the risks of wireless networking and some solutions to reduce the risks.  
Appendix C: Upgrading Firmware  
This appendix instructs you on how to upgrade the Router’s firmware should you need to do so.  
Appendix D: Windows Help  
This appendix describes how you can use Windows Help for instructions about networking, such as installing  
the TCP/IP protocol.  
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Appendix E: Finding the MAC Address and IP Address for your Ethernet Adapter  
This appendix describes how to find the MAC address for your computer’s Ethernet adapter so you can use  
the Router’s MAC filtering and/or MAC address cloning feature.  
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Appendix F: Glossary  
This appendix gives a brief glossary of terms frequently used in networking.  
Appendix G: Specifications  
This appendix provides the Router’s technical specifications.  
Appendix H: Warranty Information  
This appendix supplies the Router’s warranty information.  
Appendix I: Regulatory Information  
This appendix supplies the Router’s regulatory information.  
Appendix J: Contact Information  
This appendix provides contact information for a variety of Linksys resources, including Technical Support.  
Chapter 1: Introduction  
What’s in this Guide?  
3
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Chapter 2: Planning Your Wireless Network  
Network Topology  
network: a series of computers or devices  
connected for the purpose of data sharing,  
storage, and/or transmission between users.  
A wireless local area network is exactly like a regular local area network (LAN), except that each computer in the  
wireless network uses a wireless device to connect to the network. Computers in a wireless network share the  
same frequency channel and SSID, which is an identification name shared by the wireless devices belonging to  
the same wireless network.  
ssid: your wireless network’s name.  
Ad-Hoc versus Infrastructure Mode  
ad-hoc: a group of wireless devices  
communicating directly to each other  
(peer-to-peer) without the use of an  
access point.  
Unlike wired networks, wireless networks have two different modes in which they may be set up: infrastructure  
and ad-hoc. An infrastructure configuration is a wireless and wired network communicating to each other  
through an access point. An ad-hoc configuration is wireless-equipped computers communicating directly with  
each other. Choosing between these two modes depends on whether or not the wireless network needs to share  
data or peripherals with a wired network or not.  
Infrastructure: a wireless network  
that is bridged to a wired network via  
an access point.  
If the computers on the wireless network need to be accessible by a wired network or need to share a peripheral,  
such as a printer, with the wired network computers, the wireless network should be set up in Infrastructure  
mode. The basis of Infrastructure mode centers around a wireless router or an access point, which serves as the  
main point of communications in a wireless network. The Router transmits data to PCs equipped with wireless  
network adapters, which can roam within a certain radial range of the Router. You can arrange the Router and  
multiple access points to work in succession to extend the roaming range, and you can set up your wireless  
network to communicate with your Ethernet hardware as well.  
adapter: a device that adds  
network functionality to your PC  
ethernet: IEEE standard network protocol that  
specifies how data is placed on and retrieved  
from a common transmission medium  
If the wireless network is relatively small and needs to share resources only with the other computers on the  
wireless network, then the Ad-Hoc mode can be used. Ad-Hoc mode allows computers equipped with wireless  
transmitters and receivers to communicate directly with each other, eliminating the need for a wireless router or  
access point. The drawback of this mode is that in Ad-Hoc mode, wireless-equipped computers are not able to  
communicate with computers on a wired network. And, of course, communication between the wireless-  
equipped computers is limited by the distance and interference directly between them.  
access point: a device that allows wireless-  
equipped computers and other devices to  
communicate with a wired network. Also used  
to expand the range of a wireless network.  
Network Layout  
The Wireless-G Broadband Router has been specifically designed for use with both your 802.11b and 802.11g  
products. Now, products using these standards can communicate with each other.  
Chapter 2: Planning Your Wireless Network  
Network Topology  
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The Wireless-G Broadband Router is compatible with all 802.11b and 802.11g adapters, such as the notebook  
adapters for your laptop computers, PCI adapters for your desktop PCs, and USB adapters when you want to  
enjoy USB connectivity. The Router will also communicate with the Wireless-G PrintServer, as well as 802.11b  
and 802.11g wireless Ethernet bridges.  
When you wish to connect your wireless network with your wired network, you can use the Wireless-G  
Broadband Router’s four Ethernet ports. To add more ports, any of the Wireless-G Broadband Router's Ethernet  
ports can be connected to any of Linksys's switches.  
With these, and many other, Linksys products, your networking options are limitless. Go to the Linksys website at  
www.linksys.com for more information about products that work with the Wireless-G Broadband Router with  
SRX400.  
Chapter 2: Planning Your Wireless Network  
Network Layout  
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Chapter 3: Getting to Know the Wireless-G Broadband Router  
with SRX400  
The Router’s Ports and Reset Button  
The Router's ports and Reset button are located on one of the side panels.  
port: the connection point on a computer or networking  
device used for plugging in cables or adapters  
Figure 3-1: The Router’s Side Panel  
ETHERNET  
1, 2, 3, 4  
INTERNET  
Reset  
Color-coded yellow, these ports connect the Router to PCs and other Ethernet devices on your  
network.  
broadband: an always-on, fast Internet connection  
Color-coded blue, the INTERNET port is where you will connect your broadband Internet  
connection.  
There are two ways to reset the Router's factory defaults. Either press the Reset button, which  
is color-coded red, for approximately five seconds, using a object with a sharp point, such as a  
ball-point pen, or restore the default settings from the Administration tab - Factory Defaults in  
the Router's Web-based Utility.  
IMPORTANT: Resetting the Router will erase  
all of your settings (wireless security, network  
settings, etc.) and replace them with the  
factory defaults. Do not reset the Router if you  
want to retain these settings.  
Power  
Color-coded black, the Power port is where you will connect the power adapter.  
Chapter 3: Getting to Know the Wireless-G Broadband Router with SRX400  
The Router’s Ports and Reset Button  
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The Router’s LEDs  
The Router’s LEDs, which displays information about network activity, are located on another side panel.  
Figure 3-2: The Router’s LEDs  
POWER  
Green. The POWER LED lights up and will stay on while the Router is powered on. When the  
Router goes through its self-diagnostic mode during every boot-up, this LED will flash. When  
the diagnostic is complete, the LED will be solidly lit.  
ETHERNET  
1, 2, 3, 4  
Green. These numbered LEDs, corresponding with the numbered ports on the Router’s back  
panel, serve two purposes. If the LED is continuously lit, the Router is successfully connected  
to a device through that port. If the LED is flashing, that port is actively transmitting or  
receiving data.  
WIRELESS  
DMZ  
Green. The WIRELESS LED lights up whenever there is a successful wireless connection. If the  
LED is flashing, the Router is actively sending or receiving data over the wireless network.  
dmz: removes the Router's firewall protection from  
one PC, allowing it to be “seen” from the Internet  
Green. The DMZ LED indicates when the DMZ function is being used. This LED will remain lit  
as long as DMZ is enabled.  
INTERNET  
Green. The INTERNET LED lights up when there is a connection made through the Internet  
port. If the LED is flashing, that port is actively transmitting or receiving data.  
Chapter 3: Getting to Know the Wireless-G Broadband Router with SRX400  
The Router’s LEDs  
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Chapter 4: Connecting the Wireless-G Broadband Router  
with SRX400  
Overview  
Linksys recommends using the Setup Wizard on the Setup CD-ROM for first-time installation of the Router. For  
advanced users, you may follow the instructions in this chapter, and then configure the Router through its Web-  
based Utility (refer to “Chapter 5: Configuring the Wireless-G Broadband Router”).  
Hardware Installation for Connection to Your Broadband Modem  
1. Power down your network devices.  
2. Locate an optimum location for the Router. The best place for the Router is usually at the center of your  
wireless network, with line of sight to all of your mobile stations.  
3. Fix the direction of the antennas. Try to place the Router in a position that will best cover your wireless  
network. Normally, the higher you place the antennas, the better the performance will be.  
Figure 4-1: Connect a PC  
4. Connect your network PCs or Ethernet devices to the Router’s yellow Ethernet ports using standard Ethernet  
network cabling.  
5. Connect a standard Ethernet network cable to the Router’s blue Internet port. Then, connect the other end of  
the Ethernet cable to your cable or DSL broadband modem.  
6. Connect the AC power adapter to the Router's Power port and the other end to an electrical outlet.  
Figure 4-2: Connect the Modem  
Figure 4-3: Connect the Power  
IMPORTANT: Make sure that you use the power adapter that is supplied with the  
Router. Use of a different power adapter could damage the Router.  
Proceed to the next section, “Placement Options.”  
Chapter 4: Connecting the Wireless-G Broadband Router with SRX400  
Overview  
8
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Placement Options  
There are three ways to place the Router. The first way is to place it horizontally on a surface, so it sits on its four  
rubber feet. The second way is to stand the Router vertically on a surface (this uses a stand). The third way is to  
mount it on a wall. The second and third options are explained in further detail below.  
Stand Option  
Figure 4-4: Router’s Stand  
1. Line up the center of the Router’s stand with the center of the Router’s labeled edge.  
2. Insert the Router into the stand.  
Proceed to “Chapter 5: Configuring the Wireless-G Broadband Router.”  
60 mm  
(2.36 inches)  
There are three ways to place the Router. The first way is to place it horizontally on a surface, so it sits on its four  
rubber feet. The second way is to stand the Router vertically on a surface (this uses an optional stand). The third  
way is to mount it on a wall. The second and third options are explained in further detail below.  
Wall-Mount Option  
The Router has two wall-mount slots on its back panel.  
1. Determine where you want to mount the Router.  
2. Drill two holes into the wall. Make sure the holes are 60 mm (2.36 inches) apart.  
3. Insert a screw into each hole, and leave 5 mm (0.2 inches) of its head exposed.  
4. Maneuver the Router so the wall-mount slots line up with the two screws.  
5. Place the wall-mount slots over the screws and slide the Router down until the screws fit snugly into the wall-  
mount slots.  
Proceed to “Chapter 5: Configuring the Wireless-G Broadband Router.”  
Figure 4-5: Wall-Mount Measurements  
Chapter 4: Connecting the Wireless-G Broadband Router with SRX400  
Placement Options  
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Chapter 5: Configuring the Wireless-G Broadband Router  
Overview  
You should always use the Setup CD-ROM when first installing the Router. If you do not wish to run the Setup  
Wizard on the Setup CD-ROM, you can use the Web-based Utility to configure the Router. For advanced users, you  
may configure the Router’s advanced settings through the Web-based Utility.  
want to configure advanced settings, use this  
NOTE: When first installing the Router, you should  
use the Setup Wizard on the Setup CD-ROM. If you  
chapter to learn about the Web-based Utility.  
This chapter will describe each web page in the Utility and each page’s key functions. The utility can be accessed  
via your web browser through use of a computer connected to the Router. For a basic network setup, most users  
will use these two screens of the Utility:  
HAVE YOU: Enabled TCP/IP on your PCs? PCs  
communicate over the network with this protocol.  
Refer to “Appendix D: Windows Help” for more  
information on TCP/IP.  
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•
Basic Setup. On the Basic Setup screen, enter the settings provided by your ISP.  
Management. Click the Administration tab and then the Management tab. The Router’s default password is  
admin. To secure the Router, change the Password from its default.  
isp: your internet provider  
There are seven main tabs: Setup, Wireless, Security, Access Restrictions, Applications & Gaming, Administration,  
and Status. Additional tabs will be available after you click one of the main tabs.  
To access the Web-based Utility, launch Internet Explorer or Netscape Navigator, and enter the Router’s default IP  
address, 192.168.1.1, in the Address field. Then, press Enter.  
A password request page will appear. (Non-Windows XP users will see a similar screen.) Leave the User Name  
field blank. The first time you open the Web-based Utility, use the default password admin. (You can set a new  
password from the Administration tab’s Management screen.) Click the OK button to continue.  
Figure 5-1: Password Screen  
Chapter 5: Configuring the Wireless-G Broadband Router  
Overview  
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The Setup Tab - Basic Setup  
The first screen that appears displays the Setup tab. This allows you to change the Router's general settings.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
Internet Setup  
The Internet Setup section configures the Router to your Internet connection. Most of this information can be  
obtained through your ISP.  
Internet Connection Type  
Choose the type of Internet connection your ISP provides from the drop-down menu.  
•
Automatic Configuration - DHCP. By default, the Router’s Internet Connection Type is set to Automatic  
Configuration - DHCP, which should be kept only if your ISP supports DHCP or you are connecting through a  
dynamic IP address.  
Figure 5-2: Setup Tab - Basic Setup  
Figure 5-3: DHCP Connection Type  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Setup Tab - Basic Setup  
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Wireless-G Broadband Router with SRX400  
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Static IP. If you are required to use a permanent IP address to connect to the Internet, select Static IP.  
Internet IP Address. This is the Router’s IP address, when seen from the Internet. Your ISP will provide you  
with the IP Address you need to specify here.  
Subnet Mask. This is the Router’s Subnet Mask, as seen by users on the Internet (including your ISP). Your  
ISP will provide you with the Subnet Mask.  
Gateway. Your ISP will provide you with the Gateway Address, which is the ISP server’s IP address.  
Figure 5-4: Static IP Connection Type  
Static DNS 1-3. Your ISP will provide you with at least one DNS (Domain Name System) Server IP Address.  
static ip address: a fixed address assigned to  
a computer or device connected to a network.  
•
PPPoE. Some DSL-based ISPs use PPPoE (Point-to-Point Protocol over Ethernet) to establish Internet  
connections. If you are connected to the Internet through a DSL line, check with your ISP to see if they use  
PPPoE. If they do, you will have to enable PPPoE.  
subnet mask: an address code that determines  
the size of the network  
User Name and Password. Enter the User Name and Password provided by your ISP.  
Connect on Demand: Max Idle Time. You can configure the Router to cut the Internet connection after it has  
been inactive for a specified period of time (Max Idle Time). If your Internet connection has been terminated  
due to inactivity, Connect on Demand enables the Router to automatically re-establish your connection as  
soon as you attempt to access the Internet again. If you wish to activate Connect on Demand, click the radio  
button. In the Max Idle Time field, enter the number of minutes you want to have elapsed before your Internet  
connection terminates.  
Figure 5-5: PPPoE Connection Type  
Keep Alive Option: Redial Period. If you select this option, the Router will periodically check your Internet  
connection. If you are disconnected, then the Router will automatically re-establish your connection. To use  
this option, click the radio button next to Keep Alive. In the Redial Period field, you specify how often you want  
the Router to check the Internet connection. The default Redial Period is 30 seconds.  
pppoe: a type of broadband connection that  
provides authentication (username and  
password) in addition to data transport  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Setup Tab - Basic Setup  
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PPTP. Point-to-Point Tunneling Protocol (PPTP) is a service that applies to connections in Europe only.  
Specify Internet IP Address. This is the Router’s IP address, as seen from the Internet. Your ISP will provide  
you with the IP Address you need to specify here.  
Subnet Mask. This is the Router’s Subnet Mask, as seen by users on the Internet (including your ISP). Your  
ISP will provide you with the Subnet Mask.  
Gateway. Your ISP will provide you with the Gateway Address.  
Figure 5-6: PPTP Connection Type  
User Name and Password. Enter the User Name and Password provided by your ISP.  
Connect on Demand: Max Idle Time. You can configure the Router to cut the Internet connection after it has  
been inactive for a specified period of time (Max Idle Time). If your Internet connection has been terminated  
due to inactivity, Connect on Demand enables the Router to automatically re-establish your connection as  
soon as you attempt to access the Internet again. If you wish to activate Connect on Demand, click the radio  
button. In the Max Idle Time field, enter the number of minutes you want to have elapsed before your Internet  
connection terminates.  
Keep Alive Option: Redial Period. If you select this option, the Router will periodically check your Internet  
connection. If you are disconnected, then the Router will automatically re-establish your connection. To use  
this option, click the radio button next to Keep Alive. In the Redial Period field, you specify how often you want  
the Router to check the Internet connection. The default Redial Period is 30 seconds.  
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Telstra BigPond. Telstra BigPond is a service that applies to connections in Australia only.  
User Name and Password. Enter the User Name and Password provided by your ISP.  
Heart Beat Server. This is the IP address that the Router has, when seen from the Internet. Your ISP will  
provide you with the IP Address you need to specify here.  
Figure 5-7: Telstra BigPond Connection Type  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Setup Tab - Basic Setup  
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Optional Settings  
Some of these settings may be required by your ISP. Verify with your ISP before making any changes.  
Router Name. In this field, you can type a name of up to 39 characters to represent the Router.  
Host Name and Domain Name. These fields allow you to supply a host and domain name for the Router. Some  
ISPs, usually cable ISPs, require these names as identification. You may have to check with your ISP to see if your  
broadband Internet service has been configured with a host and domain name. In most cases, leaving these  
fields blank will work.  
Figure 5-8: Optional Settings  
packet: a unit of data sent over a network  
MTU. MTU is the Maximum Transmission Unit. It specifies the largest packet size permitted for Internet  
transmission. The default setting, Manual, allows you to enter the largest packet size that will be transmitted.  
The recommended size, entered in the Size field, is 1492. You should leave this value in the 1200 to 1500 range.  
To have the Router select the best MTU for your Internet connection, select Auto.  
Network Setup  
The Network Setup section changes the settings on the network connected to the Router’s Ethernet ports.  
Wireless setup is performed through the Wireless tab.  
Router IP  
This presents both the Router’s IP Address and Subnet Mask as seen by your local network.  
Figure 5-9: Router IP  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Setup Tab - Basic Setup  
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Network Address Server Settings (DHCP)  
The settings allow you to configure the Router’s Dynamic Host Configuration Protocol (DHCP) server function. The  
Router can be used as a DHCP server for your network. A DHCP server automatically assigns an IP address to  
each computer on your network. If you choose to enable the Router’s DHCP server option, you must configure all  
of your network PCs to connect to a DHCP server (the Router), and make sure there is no other DHCP server on  
your network.  
DHCP Server. DHCP is enabled by factory default. If you already have a DHCP server on your network, or you  
don’t want a DHCP server, then click the Disable radio button (no other DHCP features will be available).  
Figure 5-10: Network Address Server Settings  
Starting IP Address. Enter a value for the DHCP server to start with when issuing IP addresses. Because the  
Router’s default IP address is 192.168.1.1, the Starting IP Address must be 192.168.1.2 or greater, but smaller  
than 192.168.1.253. The default Starting IP Address is 192.168.1.100.  
Maximum Number of DHCP Users. Enter the maximum number of PCs that you want the DHCP server to assign  
IP addresses to. This number cannot be greater than 253. The default is 50.  
Client Lease Time. The Client Lease Time is the amount of time a network user will be allowed connection to the  
Router with their current dynamic IP address. Enter the amount of time, in minutes, that the user will be “leased”  
this dynamic IP address. After the time is up, the user will be automatically assigned a new dynamic IP address.  
The default is 0 minutes, which means one day.  
IP Address Range. The range of available IP addresses is displayed here.  
Static DNS 1-2. The Domain Name System (DNS) is how the Internet translates domain or website names into  
Internet addresses or URLs. Your ISP will provide you with at least one DNS Server IP Address. If you wish to use  
another, type that IP Address in one of these fields.  
Time Setting  
Change the time zone in which your network functions from this pull-down menu. (You can even automatically  
adjust for daylight savings time.) Then, check Automatically adjust clock for daylight saving changes.  
Figure 5-11: Time Setting  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Setup Tab - Basic Setup  
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The Setup Tab - DDNS  
The Router offers a Dynamic Domain Name System (DDNS) feature. DDNS lets you assign a fixed host and domain  
name to a dynamic Internet IP address. It is useful when you are hosting your own website, FTP server, or other  
server behind the Router. Before you can use this feature, you need to sign up for DDNS service at  
www.dyndns.org, a DDNS service provider.  
DDNS  
DDNS Service. To use DDNS, select DynDNS.org. If you do not want to use DDNS, keep the default, Disable.  
User Name. Enter the User Name for your DDNS account  
Password. Enter the Password for your DDNS account.  
Host Name. This is the DDNS URL assigned by the DDNS service.  
Internet IP Address. This displays the Router’s current IP Address as seen on the Internet.  
Status. This displays the status of the DDNS connection.  
Figure 5-12: Setup Tab - DDNS  
ddns: allows the hosting of a website, FTP server,  
or e-mail server with a fixed domain name (e.g.,  
www.xyz.com) on a dynamic IP address  
connection type.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Setup Tab - DDNS  
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The Setup Tab - MAC Address Clone  
A MAC address is a 12-digit code assigned to a unique piece of hardware for identification. Some ISPs will  
require you to register a MAC address in order to access the Internet. If you do not wish to re-register the MAC  
address with your ISP, you may assign the MAC address you have currently registered with your ISP to the Router  
with the MAC Address Clone feature.  
MAC  
Enable/Disable. To have the MAC Address cloned, click the radio button beside Enable.  
User Defined Entry. Enter the MAC Address registered with your ISP here.  
Clone Your PC’s MAC. Clicking this button will clone the MAC address of your registered PC.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
Figure 5-13: Setup Tab - MAC Address Clone  
mac address: the unique address that a  
manufacturer assigns to each networking device.  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Setup Tab - MAC Address Clone  
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The Setup Tab - Advanced Routing  
This tab is used to set up the Router’s advanced functions. NAT Mode allows you to select the type(s) of advanced  
functions you use. Static Routing sets up a fixed route to another network destination.  
Advanced Routing  
NAT Mode  
Select the mode in which this Router will function. If this Router is hosting your network’s connection to the  
Internet, select Enable. If another Router exists on your network, select Disable, which will disable the DHCP  
server on this Router.  
Dynamic Routing  
Figure 5-14: Setup Tab - Advanced Routing  
With Dynamic Routing you can enable the Router to automatically adjust to physical changes in the network’s  
layout. The Router, using the RIP protocol, determines the network packets’ route based on the fewest number of  
hops between the source and the destination. The RIP protocol regularly broadcasts routing information to other  
routers on the network.  
default gateway: a device that forwards  
Internet traffic from your local area network  
RIP. To use dynamic routing, click the Enable radio button.  
Receive RIP Version. To use dynamic routing for reception of network data, select the protocol you want: Both  
RIP v1 and v2, RIPv1, or RIPv2. If you do not want to use this feature, select None.  
Transmit RIP Version. To use dynamic routing for transmission of network data, select the protocol you want:  
Both RIP v1 and v2, RIPv1, or RIPv2. If you do not want to use this feature, select None.  
Static Routing  
To set up a static route between the Router and another network, select a number from the Select set number  
drop-down list. (A static route is a pre-determined pathway that network information must travel to reach a  
specific host or network.) Enter the information described below to set up a new static route. (Click the Delete  
This Entry button to delete a static route.)  
Enter Route Name. Enter a name for the Route here, using a maximum of 25 alphanumeric characters.  
Destination LAN IP. The Destination LAN IP is the address of the remote network or host to which you want to  
assign a static route.  
Figure 5-15: Setup Tab - Advanced Routing - NAT Mode  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Setup Tab - Advanced Routing  
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Subnet Mask. The Subnet Mask determines which portion of a Destination LAN IP address is the network  
portion, and which portion is the host portion.  
Default Gateway. This is the IP address of the gateway device that allows for contact between the Router and  
the remote network or host.  
Interface. This interface tells you whether the Destination IP Address is on the LAN & Wireless (Ethernet and  
wireless networks), the WAN (Internet), or Loopback (a dummy network in which one PC acts like a network—  
necessary for certain software programs).  
Click the Show Routing Table button to view the Static Routes you’ve already set up.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
Figure 5-16: Setup Tab - Advanced Routing - NAT  
Mode - Routing Table  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Setup Tab - Advanced Routing  
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The Wireless Tab - Basic Wireless Settings  
The basic settings for wireless networking are set on this screen.  
Wireless Network  
Wireless Network Mode. From this drop-down menu, you can select the wireless standards running on your  
network. If you have both 802.11g and 802.11b devices in your network, keep the default setting, Mixed. If you  
have only 802.11g devices, select G-Only. If you do not have any 802.11g and 802.11b devices in your network,  
select Disable. SRX400 works automatically with Mixed or G-Only mode, providing the added bonus of increased  
speed across your entire network and even greater speed when using SRX-enabled products only.  
Wireless Network Name (SSID). The SSID is the network name shared among all points in a wireless network.  
The SSID must be identical for all devices in the wireless network. It is case-sensitive and must not exceed 32  
characters (use any of the characters on the keyboard). Make sure this setting is the same for all points in your  
wireless network. For added security, you should change the default SSID (linksys) to a unique name.  
Figure 5-17: Wireless Tab - Basic Wireless Settings  
Wireless Channel. Select the appropriate channel from the list provided to correspond with your network  
settings. All devices in your wireless network must be broadcast on the same channel in order to function  
correctly and to avoid interference with other wireless items in your home. In most cases, you should keep the  
default, Auto, so the Router will automatically use the channel that has the least activity.  
Adaptive Channel Expansion. This feature increases the RF (radio frequency) bandwidth, so data rates are  
increased. The existing 20 MHz bandwidth is increased to up to 40 MHz by combining adjacent channels. In most  
cases, keep the default setting, Auto, so the Router automatically adjusts the increase depending on the  
channels available.  
Wireless SSID Broadcast. When wireless clients survey the local area for wireless networks to associate with,  
they will detect the SSID broadcast by the Router. To broadcast the Router's SSID, keep the default setting,  
Enable. To be more secure and not broadcast the Router's SSID, then select Disable.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Wireless Tab - Basic Wireless Settings  
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The Wireless Tab - Wireless Security  
The Wireless Security settings configure the security of your wireless network. There are five wireless security  
mode options supported by the Router: WPA-Personal, WPA2 Personal, WPA Enterprise, WPA2 Enterprise, and  
WEP. (WPA stands for Wi-Fi Protected Access, WEP stands for Wired Equivalent Privacy, and WPA Enterprise uses  
a RADIUS (Remote Authentication Dial-In User Service) server. WPA is a security standard stronger than WEP  
encryption. WPA2 is stronger than WPA. These options are briefly discussed here. For detailed instructions on  
configuring wireless security for the Router, turn to “Appendix B: Wireless Security.”  
Wireless Security  
Select WPA/WPA2 Personal, WPA/WPA2 Enterprise, or WEP from the Security Mode drop-down menu. Then  
proceed to the appropriate instructions. If you do not want to enable wireless security, select Disable.  
IMPORTANT: If you are using wireless security, always remember that  
each device in your wireless network MUST use the same wireless security  
method and shared key, or else the network will not function correctly. You  
may mix between WPA and WPA2 Personal or WPA and WPA2 Enterprise,  
but not between Personal and Enterprise, Personal and WEP, or Enterprise  
and WEP.  
Figure 5-18: Wireless Tab - Wireless Security (WPA/WPA  
Personal)  
encryption: encoding data transmitted in a network  
WPA/WPA2 Personal. Two WPA Personal options are available. To select WPA or WPA2 Personal, select Enable  
from the drop-down menu next to the desired option. WPA/WPA2 Personal gives you two encryption methods,  
TKIP and AES, with dynamic encryption keys. Select the type of algorithm, TKIP or AES. Enter a Personal Key of  
8-63 characters. Then enter a Group Key Renewal period, which instructs the Router how often it should change  
the encryption keys.  
WPA/WPA2 Enterprise. This option features WPA/WPA2 used in coordination with a RADIUS server. (This should  
only be used when a RADIUS server is connected to the Router.) Two WPA Enterprise options are available. To  
select WPA or WPA2 Enterprise, select Enable from the drop-down menu next to the desired option. Then, select  
the type of WPA algorithm you want to use, TKIP or AES. Enter the RADIUS server’s IP Address and port number,  
along with an Enterprise Key shared between the Router and the server. Last, enter a Key Renewal Timeout,  
which instructs the Router how often it should change the encryption keys.  
Figure 5-19: Wireless Tab - Wireless Security  
(WPA/WPA2 Enterprise)  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Wireless Tab - Wireless Security  
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WEP. WEP is a basic encryption method, which is not as secure as WPA or WPA2. To use WEP, select a Default  
Transmit Key (choose which Key to use), and a level of WEP encryption, 64 bits 10 hex digits or 128 bits 26 hex  
digits. Then either generate a WEP key using the Passphrase or enter the WEP key manually.  
IMPORTANT: If you are using wireless security, always remember that  
each device in your wireless network MUST use the same wireless security  
method and shared key, or else the network will not function correctly. You  
may mix between WPA and WPA2 Personal or WPA and WPA2 Enterprise,  
but not between Personal and Enterprise, Personal and WEP, or Enterprise  
and WEP.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes. For detailed instructions on configuring wireless security for the Router, turn to  
“Appendix B: Wireless Security.”  
Figure 5-20: Wireless Tab - Wireless Security (WEP)  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Wireless Tab - Wireless Security  
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The Wireless Tab - Wireless MAC Filter  
Wireless access can be filtered by using the MAC addresses of the wireless devices transmitting within your  
network.  
Wireless MAC Filter  
Wireless MAC Filter. This screen lets you filter wireless users by MAC Address. If you do not wish to filter users  
by MAC Address, select Disable.  
Permit Only. Clicking this button will allow wireless access by computers with specified MAC Addresses.  
There are 50 fields provided in which you can list users, by MAC Address, whose access you wish to allow. Just  
enter the MAC Address for the PC whose access you want to allow in one of the fields. For a more convenient way  
to add MAC addresses, click the Select MAC Address From Networked Computers button. The Networked  
Computers screen will appear. Select the MAC Addresses you want. Then click the Select button. Click the  
Refresh button if you want to refresh the screen. Click the Close Window button to return to the previous screen.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
Figure 5-21: Wireless Tab - Wireless MAC Filter  
Figure 5-22: Wireless MAC Filter - Networked  
Computers  
Chapter 5: Configuring the Wireless-G Broadband Router  
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The Wireless Tab - Advanced Wireless Settings  
This tab is used to set up the Router’s advanced wireless functions. These settings should only be adjusted by an  
expert administrator as incorrect settings can reduce wireless performance.  
Advanced Wireless  
Basic Rate Set. The Basic Rate is not the actual rate of data transmission; it is a series of rates at which the  
Router can transmit. (If you want to specify the Router’s rate of data transmission, configure the Transmission  
Rate setting.) The Router will advertise its Basic Rate Set to the other wireless devices in your network, so they  
know which rates will be supported. The Router will also advertise that it will automatically select the best rate  
for transmission. In most cases, you should keep the default setting, Basic Rate Set #2, which includes higher  
data rates for higher performance. If your wireless computers or other clients cannot associate with the Router,  
select Basic Rate Set #1, a set of data rates specified by the 802.11b standard.  
Transmission Rate. The rate of data transmission should be set depending on the speed of your wireless  
network. You can select from a range of transmission speeds, or you can select Auto to have the Router  
automatically use the fastest possible data rate and enable the Auto-Fallback feature. Auto-Fallback will  
negotiate the best possible connection speed between the Router and a wireless client. The default value is Auto.  
Figure 5-23: Wireless Tab - Advanced Wireless Settings  
cts (clear to send): a signal sent by a wireless  
CTS Protection Mode. CTS (Clear-To-Send) Protection Mode should remain set to its default, Auto, so when your  
Wireless-G products are not able to transmit to the Router in an environment with heavy 802.11b traffic, the CTS  
Protection Mode will be used. This function boosts the Router’s ability to catch all Wireless-G transmissions but  
will severely decrease performance.  
device, signifying that it is ready to receive data  
beacon interval: data transmitted on your wireless  
network that keeps the network synchronized  
Beacon Interval. The default value is 100. Enter a value between 1 and 65,535 milliseconds. The Beacon Interval  
value indicates the frequency interval of the beacon. A beacon is a packet broadcast by the Router to synchronize  
the wireless network.  
dtim: a message included in data packets  
that can increase wireless efficiency.  
DTIM Interval. This value, between 1 and 255, indicates the interval of the Delivery Traffic Indication Message  
(DTIM). A DTIM field is a countdown field informing clients of the next window for listening to broadcast and  
multicast messages. When the Router has buffered broadcast or multicast messages for associated clients, it  
sends the next DTIM with a DTIM Interval value. Its clients hear the beacons and awaken to receive the broadcast  
and multicast messages. The default value is 1.  
fragmentation: breaking a packet into smaller units  
when transmitting over a network medium that  
cannot support the original size of the packet.  
Fragmentation Threshold. This value specifies the maximum size for a packet before data is fragmented into  
multiple packets. If you experience a high packet error rate, you may slightly increase the Fragmentation  
Threshold. Setting the Fragmentation Threshold too low may result in poor network performance. Only minor  
reduction of the default value is recommended. In most cases, it should remain at its default value of 2346.  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Wireless Tab - Advanced Wireless Settings  
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RTS Threshold. Should you encounter inconsistent data flow, only minor reduction of the default value, 2347, is  
recommended. If a network packet is smaller than the preset RTS threshold size, the RTS/CTS mechanism will  
not be enabled. The Router sends Request to Send (RTS) frames to a particular receiving station and negotiates  
the sending of a data frame. After receiving an RTS, the wireless station responds with a Clear to Send (CTS)  
frame to acknowledge the right to begin transmission. The RTS Threshold value should remain at its default value  
of 2347.  
rts (request to send): a networking method of coordinating  
large packets through the RTS Threshold setting.  
Preamble Type. The preamble defines the length of the CRC block for communication between the Router and  
the roaming Network Card. (High network traffic areas should use the shorter preamble type.) Select the  
appropriate preamble type, Long (default) or Short.  
Network Density. This setting is a reflection of the Router’s range. Setting the density to Low provides you with  
a greater range. Setting the density to High gives you a lower range. The default setting is Low.  
Compression. This feature provides real-time hardware data compression, so pre-compressed frames are used,  
with no impact on the Router’s processor. Data throughput is thereby increased. To use compression, select  
Enable. The default setting is Disable.  
Concatenation. This feature allows data from several packets to be merged into one. Overhead is removed, so  
data throughput is increased, particularly at higher data transmission rates. If you do not want to use  
concatenation, select Disable. The default setting is Enable.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Wireless Tab - Advanced Wireless Settings  
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The Security Tab - Firewall  
Use this screen to configure the firewall and VPN pass through settings.  
Firewall  
Firewall Protection. Enable this feature to employ Stateful Packet Inspection (SPI) for more detailed review of  
data packets entering your network environment.  
Block WAN Request  
Block WAN Ping. Enable the Block WAN Ping feature by checking the box beside Block WAN Ping and you can  
prevent your network from being “pinged,” or detected, by other Internet users. The Block WAN Ping feature also  
reinforces your network security by hiding your network ports. Both functions of the Block WAN Ping feature  
make it more difficult for outside users to work their way into your network. This feature is enabled by default.  
Figure 5-24: Security Tab - Firewall  
VPN Pass Through  
firewall: a set of related programs located at a  
network gateway server that protects the resources  
of a network from users from other networks.  
These settings allow VPN tunnels using PPTP, IPSec, or L2TP protocols to pass through the Router’s firewall.  
PPTP Pass through. Point-to-Point Tunneling Protocol (PPTP) allows the Point-to-Point Protocol (PPP) to be  
tunneled through an IP network. To allow PPTP tunnels to pass through the Router, click Enable.  
IPSec Pass through. Internet Protocol Security (IPSec) is a suite of protocols used to implement secure  
exchange of packets at the IP layer. To allow IPSec tunnels to pass through the Router, click Enable.  
L2TP Pass through. Layer 2 Tunneling Protocol (L2TP) is the method used to enable Point-to-Point sessions via  
the Internet on the Layer 2 level. To allow L2TP tunnels to pass through the Router, click Enable.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Security Tab - Firewall  
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The Access Restrictions Tab - Internet Access  
The Internet Access screen allows you to block or allow specific kinds of Internet usage and traffic, such as  
Internet access, designated services, websites, and inbound traffic during specific days and times.  
Internet Access  
Internet Access Policy. Access can be managed by a policy. Use the settings on this screen to establish an  
access policy (after the Save Settings button is clicked). Selecting a policy from the drop-down menu will  
display that policy’s settings. To delete a policy, select that policy’s number and click the Delete button. To view  
all the policies, click the Summary button. (Policies can be deleted from the Summary screen by selecting the  
policy or policies and clicking the Delete button. To return to the Internet Access tab, click the Close button.)  
Status. Policies are disabled by default. To enable a policy, select the policy number from the drop-down menu,  
and click the radio button beside Enable.  
You can create a policy to manage Internet access.  
To create an Internet Access policy:  
Figure 5-25: Access Restrictions Tab - Internet Access  
1. Select a number from the Internet Access Policy drop-down menu.  
2. To enable this policy, click the radio button beside Enable.  
3. Enter a Policy Name in the field provided.  
4. Click the Edit List of PCs button to select which PCs will be affected by the policy. The List of PCs screen will  
appear. You can select a PC by MAC Address or IP Address. You can also enter a range of IP Addresses if you  
want this policy to affect a group of PCs. After making your changes, click the Save Settings button to apply  
your changes or Cancel Changes to cancel your changes. Then click the Close button.  
Figure 5-26: Internet Policy Summary  
Chapter 5: Configuring the Wireless-G Broadband Router  
The Access Restrictions Tab - Internet Access  
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5. Click the appropriate option, Deny or Allow, depending on whether you want to block or allow Internet access  
for the PCs you listed on the List of PCs screen (shown in Figure 5-26).  
6. Decide which days and what times you want this policy to be enforced. Select the individual days during  
which the policy will be in effect, or select Everyday. Then enter a range of hours and minutes during which  
the policy will be in effect, or select 24 Hours.  
7. You can filter access to various services accessed over the Internet, such as FTP or telnet, by selecting  
services from the drop-down menus next to Blocked Services. Then enter the range of ports you want to filter.  
Figure 5-27: List of PCs  
If the service you want to block is not listed or you want to edit a service’s settings, then click the Add/Edit  
Service button. Then the Port Services screen will appear.  
To add a service, enter the service’s name in the Service Name field. Select its protocol from the Protocol  
drop-down menu, and enter its range in the Port Range fields. Then click the Add button.  
To modify a service, select it from the list on the right. Change its name, protocol setting, or port range. Then  
click the Modify button.  
To delete a service, select it from the list on the right. Then click the Delete button.  
When you are finished making changes on the Port Services screen, click the Apply button to save changes.  
If you want to cancel your changes, click the Cancel button. To close the Port Services screen and return to  
the Access Restrictions screen, click the Close button.  
Figure 5-28: Port Services  
8. If you want to block websites with specific URL addresses, enter each URL in a separate field next to Website  
Blocking by URL Address.  
ftp: a protocol used to transfer files over a TCP/IP network  
9. If you want to block websites using specific keywords, enter each keyword in a separate field next to Website  
Blocking by Keyword.  
telnet: a user command and TCP/IP  
protocol used for accessing remote PCs  
10. Click the Save Settings button to save the policy’s settings. To cancel the policy’s settings, click the Cancel  
Changes button.  
url: the address of a file located on the Internet  
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The Applications and Gaming Tab - Port Range Forward  
The Applications and Gaming Tab allows you to set up public services on your network, such as web servers, ftp  
servers, e-mail servers, or other specialized Internet applications. (Specialized Internet applications are any  
applications that use Internet access to perform functions such as videoconferencing or online gaming. Some  
Internet applications may not require any forwarding.)  
Port Range Forward  
To forward a port, enter the necessary information.  
Port Range  
Application. In this field, enter the name you wish to give the application. Each name can be up to 12 characters.  
Figure 5-29: Applications and Gaming Tab - Port Range  
Forward  
Start/End. This is the port range. Enter the number that starts the port range under Start and the number that  
ends the range under End.  
Protocol. Enter the protocol used for this application, either TCP or UDP, or Both.  
IP Address. For each application, enter the IP Address of the PC running the specific application.  
Enable. Click the Enable checkbox to enable port forwarding for the relevant application.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
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The Applications and Gaming Tab - Port Triggering  
Port Triggering is used for special applications that can request a port to be opened on demand. For this feature,  
the Gateway will watch outgoing data for specific port numbers. The Gateway will remember the IP address of the  
computer that sends a transmission requesting data, so that when the requested data returns through the  
Gateway, the data is pulled back to the proper computer by way of IP address and port mapping rules.  
Port Triggering  
Application. In this field, enter the name you wish to give the application.  
Triggered Range and Forwarded Range  
Start Port and End Port. Enter the starting and ending port numbers of the Triggered Range and Forwarded  
Range.  
Figure 5-30: Applications and Gaming Tab - Port  
Triggering  
Enable. Click the Enable checkbox to enable port triggering for the relevant application.  
When finished making your changes on this tab, click the Save Settings button to save these changes, or click  
the Cancel Changes button to undo your changes.  
The Applications and Gaming Tab - DMZ  
The DMZ feature allows one network user to be exposed to the Internet for use of a special-purpose service such  
as Internet gaming or videoconferencing. DMZ hosting forwards all the ports at the same time to one PC. The Port  
Range Forward feature is more secure because it only opens the ports you want to have opened, while DMZ  
hosting opens all the ports of one computer, exposing the computer to the Internet.  
Any PC whose port is being forwarded must have its DHCP client function disabled and should have a new static  
IP address assigned to it because its IP address may change when using the DHCP function.  
DMZ  
To expose one PC, select Enable. Then, enter the computer's IP address in the DMZ Host IP Address field.  
Figure 5-31: Applications and Gaming Tab - DMZ  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
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The Applications and Gaming Tab - QoS  
Quality of Service (QoS) ensures better service to high-priority types of network traffic, which may involve  
demanding, real-time applications, such as videoconferencing.  
QoS (Quality of Service)  
Wireless  
ACK Mode. This setting prioritizes QoS for users who also have ACK Mode enabled. Users with Immediate ACK  
(the default setting) will experience reliable connectivity for normal network use. Burst ACK is faster but less  
reliable and may also affect long-range wireless performance. The No ACK setting disables the ACK feature.  
Clients utilizing ACK must have their wireless adapter on the same setting as the Router. This is normally used in  
a multicast broadcast like video. Do not use this unless you are an advanced user.  
802.11e/QoS. QoS will be enabled by default to provide the best performance for your wireless connection.  
Select Disable to improve performance for a mixed wireless network.  
Internet Access Priority  
In this section, you can set priority based on Application, Port Range, or MAC Address. There are four priories you  
can set: High, Medium, Normal, or Low.  
Enable/Disable. To limit outgoing bandwidth for the QoS policies in use, select Enable. Otherwise, select  
Disable.  
Figure 5-32: Applications and Gaming Tab - QoS (Add a  
New Application  
Set Internet Bandwidth. This setting allows you to limit the outgoing bandwidth for the QoS policies in use, so  
you can control how much bandwidth a particular application is allowed to use. Enter the bandwidth in the field.  
Application. With this option you can select None, Add a New Application, Voice Device, Online Game, or  
select from the list of applications you want to set. To create a new entry, select Add a New Application, and  
refer to the Add a New Application section.  
Priority. Select the bandwidth priority for the application you selected. Select High, Medium, Normal, or Low  
for the bandwidth you need for that application. Don’t set all applications to High, because this will defeat the  
purpose of allocating the available bandwidth. If you want to select below normal bandwidth, select Low.  
Depending on the application, a few attempts may be needed to set the appropriate bandwidth priority. Once you  
have made your selection, click Add to add to the Summary list.  
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Add a New Application  
Enter a Name  
Category  
Enter any name to indicate the name of the entry.  
Select from Port Range or MAC Address for the Router to use to set the bandwidth priority.  
Port Range  
If you selected Port Range, then this category will be available. It allows you to enter the port  
range that the application will be using. For example, if you want to allocate bandwidth for FTP,  
you can enter 21-21. If you need services for an application that uses from 1000 to 1250, you  
enter 1000-1250 as your settings. You can have up to three ranges to define for this bandwidth  
allocation. Port numbers can range from 1 to 65535. Check your application's documentation  
for details on the service ports used.  
MAC Address  
If you selected MAC Address, then this category will be available. Enter the 12 hexadecimal  
digit MAC Address to represent the device you want to set as a bandwidth priority. This is a  
unique identifier for your network device. When the Router identifies the device entered, the  
Router will allocate the priority set for that entry. Check the device’s documentation to obtain  
the MAC Address.  
Priority  
Select the bandwidth priority for the application you selected. Select High, Medium, Normal,  
or Low for the bandwidth, but don’t set all applications to High. Once you have made your  
selection, click Add to add to the Summary list.  
Figure 5-33: QoS - Voice Device  
Voice Device  
Enter the name of your network device in the Enter a Name field, enter its MAC Address, select its priority  
from the drop-down menu, and click Add.  
Online Game  
Selecting Online Game will display the Select a Game drop-down menu, which will list a few common pre-  
configured games. Select the game from the list, and then select its priority.  
Summary  
Priority  
This displays the bandwidth allocation priority of High, Medium, Normal, or Low, that you set  
for the application.  
Name  
This displays the application name or the entries you entered to be allocated.  
Information  
This displays the Port Range or MAC Address entered when you added a new application. If a  
pre-configured application was selected, there will be no valid entry shown in this section.  
Figure 5-34: QoS - Online Game  
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Remove This button allows you to remove the application entry. To remove the entry, click the Remove  
button. To save the configuration, click the Save Settings button. Otherwise, to cancel, click  
the Cancel Changes button.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
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The Administration Tab - Management  
This section of the Administration tab allows the network’s administrator to manage specific Router functions for  
access and security.  
Router Password  
Local Router Access  
Router Password and Re-enter to confirm. You can change the Router’s password from here. Enter a new  
Router password and then type it again in the Re-enter to confirm field to confirm.  
HTTPS Web Access  
Access Server. HTTP (HyperText Transport Protocol) is the communications protocol used to connect to servers  
on the World Wide Web. HTTPS is a similar protocol, but it uses SSL (Secured Socket Layer) to encrypt  
transmitted data, so security is increased. To use HTTPS when you access the Web-based Utility, click the Enable  
radio button.  
Remote Router Access  
Remote Management and Management Port. To access the Router remotely, from outside the network, verify  
that Enable is selected. Then, enter the port number that will be open to outside access. You will need to enter  
the Router’s password when accessing the Router this way, as usual.  
Figure 5-35: Administration Tab - Management  
Use HTTPS. If you want to require the use of SSL (Secured Socket Layer) to encrypt transmitted data, click the  
checkbox.  
SNMP  
The Simple Network Management Protocol (SNMP) provides network administrators with the ability to monitor  
the status of the Router and receive notification of any critical events as they occur on the network.  
SNMP. To enable SNMP, select the Enable radio button. To configure SNMP, complete all fields. To disable SNMP,  
select the Disable radio button.  
Contact. Enter the name of the network administrator for the Router, and a contact number or e-mail address.  
Device Name. Enter the name of the Router.  
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Location. Enter the location of the Router. For example, you could include the name of the building, floor number,  
and room location, such as Head Office - Floor 5 - Networking 3.  
Get Community. Enter the password that allows read-only access to the Router’s SNMP information. The default  
name is public.  
Set Community. Enter the password that allows read/write access to the Router’s SNMP information. The default  
name is private. A name must be entered in this field.  
SNMP Trap-Community. Enter the password required by the remote host computer that will receive trap  
messages or notices sent by the Router.  
SNMP Trap-Destination. Enter the IP address of the remote host computer that will receive the trap messages.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
UPnP  
UPnP. UPnP allows Windows XP and Windows Me to automatically configure the Router for various Internet  
applications, such as gaming and videoconferencing. To enable UPnP, check the Enable radio box. Because  
allowing this may present a risk to security, this feature is disabled by default.  
Multicast  
Multicast Pass Through. Multicasting allows for multiple transmissions to specific recipients at the same time.  
If multicasting is permitted, then the Router will allow IP multicast packets to be forwarded to the appropriate  
computers. Select Enable to allow multicasting, or Disable to disable this feature.  
Change these settings as described here and click the Save Settings button to apply your changes or Cancel  
Changes to cancel your changes.  
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The Administration Tab - Log  
When you click the Administration tab, you will see the Log screen. The Log screen provides you with options for  
system, Firewall, WAN Connection, and New Traffic logs of all incoming and outgoing URLs or IP addresses for  
your Internet connection. To enable the Router’s log function, click the Log button you want to enable and view  
the log.  
System Log  
Show System Log. You can view logs for events relating to your system: Unauthorized Login Attempt, Update  
Time By NTP Client, and Authorized Login.  
URL Filter Log  
Show URL Filter Log. You can view logs for specific types of Internet attacks and events: Syn Flooding, IP  
Spoofing, Deny Policies, Allow Policies, Content Filtering, ICMP Redirect, TCP Null Scan, Smurf Attack, RIP Detect,  
UDP Flood, and ICMP flood.  
Figure 5-36: Administration Tab - Log  
DoS Log  
Show DoS Log. You can view incoming connection logs for Failed Connection and Successful Connection.  
New Connection Log  
Show New Connection Log. You can view outgoing and incoming traffic logs.  
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The Administration Tab - Diagnostics  
The diagnostic tests (Ping and Traceroute) allow you to check the connections of your network components.  
Ping Test  
Ping Parameters  
Ping Target IP or Domain Name, No. of Pings, and Packets Sent. The Ping test will check the status of a  
connection. To start the test, enter the IP address or domain name of the PC whose connection you wish to test,  
how many times you wish to test it, and the size of the packet for testing. Then, click the Start Test button. The  
test field will show if the test was successful. To stop the test, click the Abort Test button. Click the Clear button  
to clear the field.  
Traceroute Test  
Figure 5-37: Administration Tab - Diagnostics  
Traceroute Parameters  
IP Address or Domain Name. To test the performance of a connection, enter the IP address or domain name of  
the PC whose connection you wish to test and click the Start Test button. The test field will show if the test was  
successful. To stop the test, click the Abort Test button. Click the Clear button to clear the screen.  
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The Administration Tab - Factory Defaults  
Use this screen to reset the Router to its factory default settings.  
Factory Defaults  
Restore Factory Defaults. Click the Yes button to reset all configuration settings to their default values, and then  
click the Save Settings button. Any settings you have saved will be lost when the default settings are restored.  
This feature is disabled by default.  
Figure 5-38: Administration Tab - Factory Defaults  
The Administration Tab - Firmware Upgrade  
Use this screen to upgrade the Router’s firmware.  
Do not upgrade your firmware unless you are experiencing problems with the Router. For more information about  
upgrading firmware, refer to “Appendix C: Upgrading Firmware”.  
Upgrade Firmware  
To upgrade the Router’s firmware, first download the firmware file from www.linksys.com. Then extract the file  
on your computer.  
Please select a file to upgrade. Enter the name of the file, or click the Browse button to locate the extracted  
file. Then click the Upgrade button.  
Figure 5-39: Administration Tab - Firmware Upgrade  
firmware: the programming code that runs a networking device  
download: to receive a file transmitted over a network  
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The Administration Tab - Config Management  
The Config Management screen allows you to backup the Router’s settings and restore them later.  
Backup Configuration  
Backup. Simply, click the Backup button and save the config file to your hard drive.  
Restore Configuration  
Please select a file to restore. When you wish to restore the configuration file, click the Browse button to  
locate the file. Then click the Restore button.  
Figure 5-40: Administration Tab - Config Management  
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The Status Tab - Router  
The Router screen on the Status Tab displays the Router’s current status. Depending on the Router’s Internet  
connection type, the status information may differ.  
Router Information  
Firmware Version. This is the Router’s current firmware version.  
Loader Version. This shows the Router’s BIOS version.  
NAT. This shows if Network Address Translation (NAT) is enabled for Internet sharing.  
Current Time. This shows the time, as you set on the Setup Tab.  
System Up Time. This is the amount of time since the Router was first booted up.  
Figure 5-41: Status Tab - Router  
Internet Connection  
Connection Type. This shows the connection type you set on the Setup Tab.  
Internet IP Address. Displayed here is the Internet IP Address of the Router.  
Subnet Mask. Displayed here is the Subnet Mask of the Router.  
Default Gateway. Displayed here is the IP address of the Default Gateway.  
DNS IP Address. Displayed here is IP address of the DNS server.  
MAC Address. This is the Router’s MAC Address, as seen by your ISP.  
DHCP Release and DHCP Renew. These buttons are available if the Router is using the DHCP Client connection  
type. Click the DHCP Release button to release the Router’s IP address. Click the DHCP Renew button to retrieve  
a new IP address for the Router.  
Connect and Disconnect. These buttons are available if the Router is using a dial-up style connection, such as  
PPTP. Click the Connect button to start the Internet connection. Click the Disconnect button to end the Internet  
connection.  
Click the Refresh button to update the on-screen information. Help information is shown on the right-hand side  
of the screen.  
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The Status Tab - Local Network  
The Local Network screen on the Status Tab displays the status of your network.  
Local Network  
MAC Address. This is the Router’s MAC Address, as seen on your local, Ethernet network.  
IP Address. This shows the Router’s IP Address, as it appears on your local, Ethernet network.  
Subnet Mask. When the Router is using a Subnet Mask, it is shown here.  
DHCP Server. If you are using the Router as a DHCP server, that will be displayed here.  
Starting IP Address. For the range of IP Addresses used by devices on your local, Ethernet network, the  
beginning of that range is shown here.  
Figure 5-42: Status Tab - Local Network  
Ending IP Address. For the range of IP Addresses used by devices on your local, Ethernet network, the end of  
that range is shown here.  
DHCP Client Table. Clicking this button will open a screen to show you which PCs are utilizing the Router as a  
DHCP server.  
Figure 5-43: DHCP Active IP Table  
Click the Refresh button to update the on-screen information. Help information is shown on the right-hand side  
of the screen.  
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The Status Tab - Wireless  
The Wireless screen on the Status Tab displays the status of your wireless network.  
Wireless  
MAC Address. This is the Router’s MAC Address, as seen on your local, wireless network.  
Mode. As selected from the Wireless tab, this will display the wireless mode (Mixed, G-Only, or Disabled) used by  
the network.  
SSID. As entered on the Wireless tab, this will display the wireless network name or SSID.  
Channel. As entered on the Wireless tab, this will display the channel on which your wireless network is  
broadcasting.  
Figure 5-44: Status Tab - Wireless  
Encryption Mode. As selected on the Wireless Security Tab, this will display what type of encryption the Router  
uses for security.  
Click the Refresh button to update the on-screen information. Help information is shown on the right-hand side  
of the screen.  
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The Status Tab - System Performance  
The System Performance screen displays status information about network traffic for the Internet, wireless  
activities, and wired connectivity.  
System Performance  
Internet/Wireless  
Statistics for the network traffic on the Internet connection and wireless connectivity are shown in two separate  
columns.  
IP Address. The IP address of the Router’s interface is displayed here.  
MAC Address. The MAC address of the Router’s interface is shown here.  
Packets Received. The number of packets received are displayed here.  
Connection. The status of the connection is shown here.  
Packets Sent. The number of packets sent are displayed here.  
Bytes Received. The number of bytes received is shown here.  
Figure 5-45: Status Tab - System Performance  
Bytes Sent. The number of bytes sent is shown here.  
Error Packets Received. The number of error packets received is displayed here.  
Dropped Packets Received. The number of dropped packets received is displayed here.  
LAN  
Statistics for the network traffic on each of the four LAN ports are shown in four separate columns.  
IP Address. The IP address of the Router’s interface is displayed here.  
MAC Address. The MAC address of the Router’s interface is shown here.  
Port 1, 2, 3, 4. This shows the status of the LAN Port connection and speed.  
Packets Received. The number of packets received is displayed here.  
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Packets Sent. The number of packets sent is displayed here.  
Bytes Received. The number of bytes received is shown here.  
Bytes Sent. The number of bytes sent is shown here.  
Error Packets Received. The number of error packets received is displayed here.  
Dropped Packets Received. The number of dropped packets received is displayed here.  
Click the Refresh button to update the on-screen information. Help information is shown on the right-hand side  
of the screen.  
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Appendix A: Troubleshooting  
This appendix consists of two parts: “Common Problems and Solutions” and “Frequently Asked Questions.”  
Provided are possible solutions to problems that may occur during the installation and operation of the Router.  
Read the descriptions below to help you solve your problems. If you can’t find an answer here, check the Linksys  
website at www.linksys.com.  
Common Problems and Solutions  
1. I’m trying to access the Router’s Web-based Utility, but I do not see the login screen. Instead, I see a  
screen saying, “404 Forbidden.”  
If you are using Windows Explorer, perform the following steps until you see the Web-based Utility’s login  
screen (Netscape Navigator will require similar steps):  
1. Click File. Make sure Work Offline is NOT checked.  
2. Press CTRL + F5. This is a hard refresh, which will force Windows Explorer to load new webpages,  
not cached ones.  
3. Click Tools. Click Internet Options. Click the Security tab. Click the Default level button. Make sure  
the security level is Medium or lower. Then click the OK button.  
2. I need to set a static IP address on a PC.  
You can assign a static IP address to a PC by performing the following steps:  
•
For Windows 98SE and Me:  
1. Click Start, Settings, and Control Panel. Double-click Network.  
2. In The following network components are installed box, select the TCP/IP-> associated with your  
Ethernet adapter. If you only have one Ethernet adapter installed, you will only see one TCP/IP line  
with no association to an Ethernet adapter. Highlight it and click the Properties button.  
3. In the TCP/IP properties window, select the IP address tab, and select Specify an IP address. Enter  
a unique IP address that is not used by any other computer on the network connected to the Router.  
Make sure that each IP address is unique for each PC or network device.  
4. Click the Gateway tab, and in the New Gateway prompt, enter 192.168.1.1, which is the default IP  
address of the Router. Click the Add button to accept the entry.  
5. Click the DNS tab, and make sure the DNS Enabled option is selected. Enter the Host and Domain  
names (e.g., John for Host and home for Domain). Enter the DNS entry provided by your ISP. If your ISP  
has not provided the DNS IP address, contact your ISP to get that information or go to its website for  
the information.  
6. Click the OK button in the TCP/IP properties window, and click Close or the OK button for the Network  
window.  
7. Restart the computer when asked.  
Appendix A: Troubleshooting  
Common Problems and Solutions  
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•
For Windows 2000:  
1. Click Start, Settings, and Control Panel. Double-click Network and Dial-Up Connections.  
2. Right-click the Local Area Connection that is associated with the Ethernet adapter you are using, and  
select the Properties option.  
3. In the Components checked are used by this connection box, highlight Internet Protocol (TCP/IP),  
and click the Properties button. Select Use the following IP address option.  
4. Enter a unique IP address that is not used by any other computer on the network connected to the  
Router.  
5. Enter the Subnet Mask, 255.255.255.0.  
6. Enter the Default Gateway, 192.168.1.1 (Router’s default IP address).  
7. Toward the bottom of the window, select Use the following DNS server addresses, and enter the  
Preferred DNS server and Alternative DNS server (provided by your ISP). Contact your ISP or go on its  
website to find the information.  
8. Click the OK button in the Internet Protocol (TCP/IP) Properties window, and click the OK button in the  
Local Area Connection Properties window.  
9. Restart the computer if asked.  
•
For Windows XP:  
The following instructions assume you are running Windows XP with the default interface. If you are using  
the Classic interface (where the icons and menus look like previous Windows versions), please follow the  
instructions for Windows 2000.  
1. Click Start and Control Panel.  
2. Click the Network and Internet Connections icon and then the Network Connections icon.  
3. Right-click the Local Area Connection that is associated with the Ethernet adapter you are using,  
and select the Properties option.  
4. In the This connection uses the following items box, highlight Internet Protocol (TCP/IP). Click the  
Properties button.  
5. Enter a unique IP address that is not used by any other computer on the network connected to the  
Router.  
6. Enter the Subnet Mask, 255.255.255.0.  
7. Enter the Default Gateway, 192.168.1.1 (Router’s default IP address).  
8. Toward the bottom of the window, select Use the following DNS server addresses, and enter the  
Preferred DNS server and Alternative DNS server (provided by your ISP). Contact your ISP or go on its  
website to find the information.  
9. Click the OK button in the Internet Protocol (TCP/IP) Properties window. Click the OK button in the  
Local Area Connection Properties window.  
3. I want to test my Internet connection.  
Check your TCP/IP settings.  
A
For Windows 98SE, Me, 2000, and XP:  
Appendix A: Troubleshooting  
Common Problems and Solutions  
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Wireless-G Broadband Router with SRX400  
•
B
Refer to “Appendix D: Windows Help” for details. Make sure Obtain IP address automatically is selected in  
the settings.  
Open a command prompt.  
For Windows 98SE and Me:  
Click Start and Run. In the Open field, type command. Press the Enter key or click the OK button.  
For Windows 2000 and XP:  
•
•
Click Start and Run. In the Open field, type cmd. Press the Enter key or click the OK button. In the  
command prompt, type ping 192.168.1.1 and press the Enter key.  
•
•
If you get a reply, the computer is communicating with the Router.  
If you do NOT get a reply, please check the cable, and make sure Obtain an IP address automatically is  
selected in the TCP/IP settings for your Ethernet adapter.  
C
In the command prompt, type ping followed by your Internet or WAN IP address and press the Enter key.  
The Internet or WAN IP Address can be found on the Status screen of the Router’s web-based utility. For  
example, if your Internet or WAN IP address is 1.2.3.4, you would enter ping 1.2.3.4 and press the Enter key.  
•
If you get a reply, the computer is connected to the Router.  
•
If you do NOT get a reply, try the ping command from a different computer to verify that your original  
computer is not the cause of the problem.  
D
•
In the command prompt, type ping www.yahoo.com and press the Enter key.  
If you get a reply, the computer is connected to the Internet. If you cannot open a webpage, try the ping  
command from a different computer to verify that your original computer is not the cause of the problem.  
If you do NOT get a reply, there may be a problem with the connection. Try the ping command from a  
different computer to verify that your original computer is not the cause of the problem.  
•
5. I am not getting an IP address on the Internet with my Internet connection.  
•
•
Refer to “Problem #3, I want to test my Internet connection” to verify that you have connectivity.  
If you need to register the MAC address of your Ethernet adapter with your ISP, please see “Appendix E:  
Finding the MAC address and IP Address for Your Ethernet Adapter.” If you need to clone the MAC address  
of your Ethernet adapter onto the Router, see the System section of “Chapter 5: Configuring the  
Wireless-G Broadband Router” for details.  
•
Make sure you are using the right Internet connection settings. Contact your ISP to see if your Internet  
connection type is DHCP, Static IP Address, or PPPoE (commonly used by DSL consumers). Please refer to  
the Setup section of “Chapter 5: Configuring the Wireless-G Broadband Router” for details on Internet  
connection settings.  
•
•
Make sure you have the right cable. Check to see if the Internet column has a solidly lit Link/Act LED.  
Make sure the cable connecting from your cable or DSL modem is connected to the Router’s Internet port.  
Verify that the Status page of the Router’s web-based utility shows a valid IP address from your ISP.  
Turn off the computer, Router, and cable/DSL modem. Wait 30 seconds, and then turn on the Router,  
cable/DSL modem, and computer. Check the Status tab of the Router’s web-based utility to see if you get  
an IP address.  
•
Appendix A: Troubleshooting  
Common Problems and Solutions  
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Wireless-G Broadband Router with SRX400  
6. I am not able to access the Setup page of the Router’s web-based utility.  
•
Refer to “Problem #3, I want to test my Internet connection” to verify that your computer is properly  
connected to the Router.  
•
Refer to “Appendix E: Finding the MAC Address and IP address for Your Ethernet Adapter” to verify that  
your computer has an IP Address, Subnet Mask, Gateway, and DNS.  
Set a static IP address on your system; refer to “Problem #2: I need to set a static IP address.”  
Refer to “Problem #11: I am a PPPoE user, and I need to remove the proxy settings or the dial-up pop-up  
window.”  
•
•
7. I need to set up a server behind my Router and make it available to the public.  
To use a server like a web, ftp, or mail server, you need to know the respective port numbers they are using.  
For example, port 80 (HTTP) is used for web; port 21 (FTP) is used for FTP, and port 25 (SMTP outgoing) and  
port 110 (POP3 incoming) are used for the mail server. You can get more information by viewing the  
documentation provided with the server you installed.  
Follow these steps to set up port forwarding through the Router’s web-based utility. We will be setting up  
web, ftp, and mail servers.  
1. Access the Router’s web-based utility by going to http://192.168.1.1 or the IP address of the Router.  
Go to the Applications & Gaming => Port Forwarding tab.  
2. Enter any name you want to use for the Customized Application.  
3. Enter the External Port range of the service you are using. For example, if you have a web server, you  
would enter the range 80 to 80.  
4. Check the protocol you will be using, TCP and/or UDP.  
5. Enter the IP address of the PC or network device that you want the port server to go to. For example,  
if the web server’s Ethernet adapter IP address is 192.168.1.100, you would enter 100 in the field  
provided. Check “Appendix E: Finding the MAC Address and IP Address for Your Ethernet Adapter” for  
details on getting an IP address.  
6. Check the Enable option for the port services you want to use. Consider the example below:  
Application  
Web server  
Start and End  
80 to 80  
Protocol  
Both  
IP Address  
Enabled  
192.168.1.100  
192.168.1.101  
192.168.1.102  
192.168.1.102  
X
X
X
X
FTP server  
21 to 21  
TCP  
SMTP (outgoing)  
POP3 (incoming)  
25 to 25  
Both  
110 to 110  
Both  
When you have completed the configuration, click the Save Settings button.  
Appendix A: Troubleshooting  
Common Problems and Solutions  
48  
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Wireless-G Broadband Router with SRX400  
8. I need to set up online game hosting or use other Internet applications.  
If you want to play online games or use Internet applications, most will work without doing any port  
forwarding or DMZ hosting. There may be cases when you want to host an online game or Internet  
application. This would require you to set up the Router to deliver incoming packets or data to a specific  
computer. This also applies to the Internet applications you are using. The best way to get the information on  
what port services to use is to go to the website of the online game or application you want to use. Follow  
these steps to set up online game hosting or use a certain Internet application:  
1. Access the Router’s web interface by going to http://192.168.1.1 or the IP address of the Router. Go to  
the Applications & Gaming => Port Forwarding tab.  
2. Enter any name you want to use for the Customized Application.  
3. Enter the External Port range of the service you are using. For example, if you want to host Unreal  
Tournament (UT), you would enter the range 7777 to 27900.  
4. Check the protocol you will be using, TCP and/or UDP.  
5. Enter the IP address of the PC or network device that you want the port server to go to. For example,  
if the web server’s Ethernet adapter IP address is 192.168.1.100, you would enter 100 in the field  
provided. Check “Appendix E: Finding the MAC Address and IP Address for Your Ethernet Adapter” for  
details on getting an IP address.  
6. Check the Enable option for the port services you want to use. Consider the example below:  
Application  
UT  
Start and End  
7777 to 27900  
27015 to 27015  
5631 to 5631  
500 to 500  
Protocol  
Both  
IP Address  
Enabled  
192.168.1.100  
192.168.1.105  
192.168.1.102  
192.168.1.100  
X
X
X
X
Halflife  
Both  
PC Anywhere  
VPN IPSEC  
UDP  
UDP  
When you have completed the configuration, click the Save Settings button.  
9. I can’t get the Internet game, server, or application to work.  
If you are having difficulties getting any Internet game, server, or application to function properly, consider  
exposing one PC to the Internet using DeMilitarized Zone (DMZ) hosting. This option is available when an  
application requires too many ports or when you are not sure which port services to use. Make sure you  
disable all the forwarding entries if you want to successfully use DMZ hosting, since forwarding has priority  
over DMZ hosting. (In other words, data that enters the Router will be checked first by the forwarding settings.  
If the port number that the data enters from does not have port forwarding, then the Router will send the data  
to whichever PC or network device you set for DMZ hosting.)  
Appendix A: Troubleshooting  
Common Problems and Solutions  
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Wireless-G Broadband Router with SRX400  
Follow these steps to set DMZ hosting:  
1. Access the Router’s web-based utility by going to http://192.168.1.1 or the IP address of the Router.  
Go to the Applications & Gaming => Port Forwarding tab.  
2. Disable or remove the entries you have entered for forwarding. Keep this information in case you  
want to use it at a later time.  
3. Go to the Applications & Gaming => DMZ tab.  
4. Select Enable next to DMZ. In the DMZ Host IP Address field, enter the IP address of the computer you  
want exposed to the Internet. This will bypass the NAT technology for that computer. Please refer to  
“Appendix E: Finding the MAC Address and IP Address for Your Ethernet Adapter” for details on getting  
an IP address.  
5. Once completed with the configuration, click the Save Settings button.  
10.I forgot my password, or the password prompt always appears when I am saving settings to the  
Router.  
Reset the Router to factory default by pressing the Reset button for 10 seconds and then releasing it. If you  
are still getting prompted for a password when saving settings, then perform the following steps:  
1. Access the Router’s web-based utility by going to http://192.168.1.1 or the IP address of the Router.  
Enter the default password admin, and click the Administrations => Management tab.  
2. Enter a different password in the Router Password field, and enter the same password in the second  
field to confirm the password.  
3. Click the Save Settings button.  
11.I am a PPPoE user, and I need to remove the proxy settings or the dial-up pop-up window.  
If you have proxy settings, you need to disable these on your computer. Because the Router is the gateway for  
the Internet connection, the computer does not need any proxy settings to gain access. Please follow these  
directions to verify that you do not have any proxy settings and that the browser you use is set to connect  
directly to the LAN.  
•
For Microsoft Internet Explorer 5.0 or higher:  
1. Click Start, Settings, and Control Panel. Double-click Internet Options.  
2. Click the Connections tab.  
3. Click the LAN settings button and remove anything that is checked.  
4. Click the OK button to go back to the previous screen.  
5. Click the option Never dial a connection. This will remove any dial-up pop-ups for PPPoE users.  
For Netscape 4.7 or higher:  
•
1. Start Netscape Navigator, and click Edit, Preferences, Advanced, and Proxies.  
2. Make sure you have Direct connection to the Internet selected on this screen.  
3. Close all the windows to finish.  
Appendix A: Troubleshooting  
Common Problems and Solutions  
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Wireless-G Broadband Router with SRX400  
12.To start over, I need to set the Router to factory default.  
Hold the Reset button for 10 seconds and then release it. This will return the password, forwarding, and other  
settings on the Router to the factory default settings. In other words, the Router will revert to its original  
factory configuration.  
13.My power LED will not stop flashing.  
Press and hold the reset button for five seconds. If this does not work, your firmware may be corrupted. To  
upgrade the firmware, follow the steps in “Appendix C: Upgrading Firmware.”  
14.I need to upgrade the firmware.  
In order to upgrade the firmware with the latest features, you need to go to the Linksys website and download  
the latest firmware at www.linksys.com.  
Follow these steps:  
1. Go to the Linksys website at http://www.linksys.com and download the latest firmware.  
2. To upgrade the firmware, follow the steps in “Appendix C: Upgrading Firmware.”  
15.My DSL service’s PPPoE is always disconnecting.  
PPPoE is not actually a dedicated or always-on connection. The DSL ISP can disconnect the service after a  
period of inactivity, just like a normal phone dial-up connection to the Internet.  
•
There is a setup option to “keep alive” the connection. This may not always work, so you may need to re-  
establish connection periodically.  
1. To connect to the Router, go to the web browser, and enter http://192.168.1.1 or the IP address of the  
Router.  
2. Enter the password, if asked. (The default password is admin.)  
3. On the Setup screen, select the option Keep Alive, and set the Redial Period option at 20 (seconds).  
4. Click the Save Settings button.  
5. Click the Status tab, and click the Connect button.  
6. You may see the login status display as Connecting. Press the F5 key to refresh the screen, until you  
see the login status display as Connected.  
•
•
Click the Save Settings button to continue.  
If the connection is lost again, follow steps 1- 6 to re-establish connection.  
16.I can’t access my e-mail, web or I am getting corrupted data from the Internet.  
The Maximum Transmission Unit (MTU) setting may need to be adjusted. By default, the MTU is set at 1500.  
For most DSL users, it is strongly recommended to use MTU 1492.  
•
If you are having some difficulties, perform the following steps:  
1. To connect to the Router, go to the web browser, and enter http://192.168.1.1 or the IP address of the  
Router.  
2. Enter the password, if asked. (The default password is admin.)  
3. Look for the MTU option, and select Manual. In the Size field, enter 1492.  
Appendix A: Troubleshooting  
Common Problems and Solutions  
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Wireless-G Broadband Router with SRX400  
4. Click the Save Settings button to continue.  
If your difficulties continue, change the Size to different values. Try this list of values, one value at a time,  
•
in this order, until your problem is solved:  
1462  
1400  
1362  
1300  
17.When I enter a URL or IP address, I get a time-out error or am prompted to retry.  
•
Check if other PCs work. If they do, ensure that your workstation’s IP settings are correct (IP Address,  
Subnet Mask, Default Gateway, and DNS). Restart the computer that is having a problem.  
If the PCs are configured correctly, but still not working, check the Router. Ensure that it is connected and  
powered on. Connect to it and check its settings. (If you cannot connect to it, check the LAN and power  
connections.)  
•
•
If the Router is configured correctly, check your Internet connection (DSL/cable modem, etc.) to see if it is  
working correctly. You can remove the Router to verify a direct connection.  
•
•
Manually configure the TCP/IP settings with a DNS address provided by your ISP.  
Make sure that your browser is set to connect directly and that any dial-up is disabled. For Internet  
Explorer, click Tools, Internet Options, and then the Connection tab. Make sure that Internet Explorer is  
set to Never dial a connection. For Netscape Navigator, click Edit, Preferences, Advanced, and Proxy.  
Make sure that Netscape Navigator is set to Direct connection to the Internet.  
18.I cannot connect to the Internet.  
•
For Cable users - Click on the Status tab and make sure you have the Internet IP address is not 0.0.0.0. If  
it is, click the DHCP Renew button, and wait a few minutes for the router to try and contact your service  
provider. After the router successfully obtains an IP address, restart your computer.  
For DSL users - 1) Make sure you have typed in your user name and password correctly. Some service  
providers use your full e-mail address as the user name. If you are sure you have enter the right user  
name, try using username@[isp.com], where isp.com is the name of your service provider. 2) Power down  
your DSL Modem, your PC, and your router. Then power on your DSL Modem, wait for the LEDs on the DSL  
modem to stop flashing. Power on your router and wait for the power LED to stop flashing. Finally, power  
on your PC.  
•
19.My wireless-G speed seems to be slow.  
•
•
•
Reposition the antenna.  
Reposition the router so that it's higher up, above your other networking gear.  
Change CTS Protection to Disable under advanced wireless settings.  
Appendix A: Troubleshooting  
Common Problems and Solutions  
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Wireless-G Broadband Router with SRX400  
20.I do not see a speed improvement while surfing wirelessly with my SRX equipment.  
•
•
•
Your Internet connection is usually much slower than your wireless network with SRX equipment. This  
equipment will not affect the speed of your Internet connection.  
You will see the most improvements in transferring or streaming files from one computer to another in  
your network.  
Your network speed will slow down if you have mixed 802.11g and SRX clients. For maximum  
performance, use all SRX devices on your network.  
21.How do I turn on SRX on my router?  
SRX is automatically turned on in Mixed and G-Only mode. There's nothing you need to do to utilize this  
feature.  
Frequently Asked Questions  
What is the maximum number of IP addresses that the Router will support?  
The Router will support up to 253 IP addresses.  
Is IPSec Pass-Through supported by the Router?  
Yes, it is a built-in feature that the Router automatically enables.  
Where is the Router installed on the network?  
In a typical environment, the Router is installed between the cable/DSL modem and the LAN. Plug the Router into  
the cable/DSL modem’s Ethernet port.  
Does the Router support IPX or AppleTalk?  
No. TCP/IP is the only protocol standard for the Internet and has become the global standard for communications.  
IPX, a NetWare communications protocol used only to route messages from one node to another, and AppleTalk, a  
communications protocol used on Apple and Macintosh networks, can be used for LAN to LAN connections, but  
those protocols cannot connect from the Internet to a LAN.  
Does the Internet connection of the Router support 100Mbps Ethernet?  
The Router’s current hardware design supports up to 100Mbps Ethernet on its Internet port; however, the Internet  
connection speed will vary depending on the speed of your broadband connection. The Router also supports  
100Mbps over the auto-sensing Fast Ethernet 10/100 switch on the LAN side of the Router.  
What is Network Address Translation and what is it used for?  
Network Address Translation (NAT) translates multiple IP addresses on the private LAN to one public address that  
is sent out to the Internet. This adds a level of security since the address of a PC connected to the private LAN is  
never transmitted on the Internet. Furthermore, NAT allows the Router to be used with low cost Internet accounts,  
Appendix A: Troubleshooting  
Frequently Asked Questions  
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Wireless-G Broadband Router with SRX400  
such as DSL or cable modems, when only one TCP/IP address is provided by the ISP. The user may have many  
private addresses behind this single address provided by the ISP.  
Does the Router support any operating system other than Windows 98SE, Windows Millennium,  
Windows 2000, or Windows XP?  
Yes, but Linksys does not, at this time, provide technical support for setup, configuration or troubleshooting of  
any non-Windows operating systems.  
Does the Router support ICQ send file?  
Yes, with the following fix: click ICQ menu -> preference -> connections tab->, and check I am behind a firewall  
or proxy. Then set the firewall time-out to 80 seconds in the firewall setting. The Internet user can then send a file  
to a user behind the Router.  
I set up an Unreal Tournament Server, but others on the LAN cannot join. What do I need to do?  
If you have a dedicated Unreal Tournament server running, you need to create a static IP for each of the LAN  
computers and forward ports 7777, 7778, 7779, 7780, 7781, and 27900 to the IP address of the server. You can  
also use a port forwarding range of 7777 ~ 27900. If you want to use the UT Server Admin, forward another port.  
(Port 8080 usually works well but is used for remote admin. You may have to disable this.) Then in the  
[UWeb.WebServer] section of the server.ini file, set the ListenPort to 8080 (to match the mapped port above) and  
ServerName to the IP assigned to the Router from your ISP.  
Can multiple gamers on the LAN get on one game server and play simultaneously with just one public IP  
address?  
It depends on which network game or what kind of game server you are using. For example, Unreal Tournament  
supports multi-login with one public IP.  
How do I get Half-Life: Team Fortress to work with the Router?  
The default client port for Half-Life is 27005. The computers on your LAN need to have “+clientport 2700x”  
added to the HL shortcut command line; the x would be 6, 7, 8, and on up. This lets multiple computers connect  
to the same server. One problem: Version 1.0.1.6 won’t let multiple computers with the same CD key connect at  
the same time, even if on the same LAN (not a problem with 1.0.1.3). As far as hosting games, the HL server does  
not need to be in the DMZ. Just forward port 27015 to the local IP address of the server computer.  
How can I block corrupted FTP downloads?  
If you are experiencing corrupted files when you download a file with your FTP client, try using another FTP  
program.  
Appendix A: Troubleshooting  
Frequently Asked Questions  
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Wireless-G Broadband Router with SRX400  
The web page hangs; downloads are corrupt, or nothing but junk characters are being displayed on the  
screen. What do I need to do?  
Force your Ethernet adapter to 10Mbps or half duplex mode, and turn off the “Auto-negotiate” feature of your  
Ethernet adapter as a temporary measure. (Please look at the Network Control Panel in your Ethernet adapter’s  
Advanced Properties tab.) Make sure that your proxy setting is disabled in the browser. Check our website at  
www.linksys.com for more information.  
If all else fails in the installation, what can I do?  
Reset the Router by holding down the reset button until the Power LED fully turns on and off. Reset your cable or  
DSL modem by powering the unit off and then on. Obtain and flash the latest firmware release that is readily  
available on the Linksys website, www.linksys.com.  
How will I be notified of new Router firmware upgrades?  
All Linksys firmware upgrades are posted on the Linksys website at www.linksys.com, where they can be  
downloaded for free. To upgrade the Router’s firmware, use the System tab of the Router’s web-based utility. If  
the Router’s Internet connection is working well, there is no need to download a newer firmware version, unless  
that version contains new features that you would like to use. Downloading a more current version of Router  
firmware will not enhance the quality or speed of your Internet connection, and may disrupt your current  
connection stability.  
Will the Router function in a Macintosh environment?  
Yes, but the Router’s setup pages are accessible only through Internet Explorer 4.0 or Netscape Navigator 4.0 or  
higher for Macintosh.  
I am not able to get the web configuration screen for the Router. What can I do?  
You may have to remove the proxy settings on your Internet browser, e.g., Netscape Navigator or Internet  
Explorer. Or remove the dial-up settings on your browser. Check with your browser documentation, and make  
sure that your browser is set to connect directly and that any dial-up is disabled. Make sure that your browser is  
set to connect directly and that any dial-up is disabled. For Internet Explorer, click Tools, Internet Options, and  
then the Connection tab. Make sure that Internet Explorer is set to Never dial a connection. For Netscape  
Navigator, click Edit, Preferences, Advanced, and Proxy. Make sure that Netscape Navigator is set to Direct  
connection to the Internet.  
What is DMZ Hosting?  
Demilitarized Zone (DMZ) allows one IP address (computer) to be exposed to the Internet. Some applications  
require multiple TCP/IP ports to be open. It is recommended that you set your computer with a static IP if you  
want to use DMZ Hosting. To get the LAN IP address, see “Appendix E: Finding the MAC Address and IP Address  
for Your Ethernet Adapter.”  
Appendix A: Troubleshooting  
Frequently Asked Questions  
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Wireless-G Broadband Router with SRX400  
If DMZ Hosting is used, does the exposed user share the public IP with the Router?  
No.  
Does the Router pass PPTP packets or actively route PPTP sessions?  
The Router allows PPTP packets to pass through.  
Is the Router cross-platform compatible?  
Any platform that supports Ethernet and TCP/IP is compatible with the Router.  
How many ports can be simultaneously forwarded?  
Theoretically, the Router can establish 520 sessions at the same time, but you can only forward 10 ranges of  
ports.  
What are the advanced features of the Router?  
The Router’s advanced features include Advanced Wireless settings, Filters, Port Forwarding, Routing, and DDNS.  
How do I get mIRC to work with the Router?  
Under the Port Forwarding tab, set port forwarding to 113 for the PC on which you are using mIRC.  
Can the Router act as my DHCP server?  
Yes. The Router has DHCP server software built-in.  
Can I run an application from a remote computer over the wireless network?  
This will depend on whether or not the application is designed to be used over a network. Consult the  
application’s documentation to determine if it supports operation over a network.  
What is the IEEE 802.11g standard?  
It is one of the IEEE standards for wireless networks. The 802.11g standard allows wireless networking hardware  
from different manufacturers to communicate, provided that the hardware complies with the 802.11g standard.  
The 802.11g standard states a maximum data transfer rate of 54Mbps and an operating frequency of 2.4GHz.  
What is the IEEE 802.11b standard?  
It is one of the IEEE standards for wireless networks. The 802.11b standard allows wireless networking hardware  
from different manufacturers to communicate, provided that the hardware complies with the 802.11b standard.  
The 802.11b standard states a maximum data transfer rate of 11Mbps and an operating frequency of 2.4GHz.  
Appendix A: Troubleshooting  
Frequently Asked Questions  
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Wireless-G Broadband Router with SRX400  
What IEEE 802.11g features are supported?  
The product supports the following IEEE 802.11g functions:  
•
•
•
•
•
•
•
CSMA/CA plus Acknowledge protocol  
OFDM protocol  
Multi-Channel Roaming  
Automatic Rate Selection  
RTS/CTS feature  
Fragmentation  
Power Management  
What IEEE 802.11b features are supported?  
The product supports the following IEEE 802.11b functions:  
•
•
•
•
•
•
CSMA/CA plus Acknowledge protocol  
Multi-Channel Roaming  
Automatic Rate Selection  
RTS/CTS feature  
Fragmentation  
Power Management  
What is ad-hoc mode?  
When a wireless network is set to ad-hoc mode, the wireless-equipped computers are configured to  
communicate directly with each other. The ad-hoc wireless network will not communicate with any wired  
network.  
What is infrastructure mode?  
When a wireless network is set to infrastructure mode, the wireless network is configured to communicate with a  
wired network through a wireless access point.  
What is roaming?  
Roaming is the ability of a portable computer user to communicate continuously while moving freely throughout  
an area greater than that covered by a single access point. Before using the roaming function, the workstation  
must make sure that it is the same channel number with the access point of dedicated coverage area.  
To achieve true seamless connectivity, the wireless LAN must incorporate a number of different functions. Each  
node and access point, for example, must always acknowledge receipt of each message. Each node must  
maintain contact with the wireless network even when not actually transmitting data. Achieving these functions  
simultaneously requires a dynamic RF networking technology that links access points and nodes. In such a  
system, the user’s end node undertakes a search for the best possible access to the system. First, it evaluates  
such factors as signal strength and quality, as well as the message load currently being carried by each access  
point and the distance of each access point to the wired backbone. Based on that information, the node next  
Appendix A: Troubleshooting  
Frequently Asked Questions  
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selects the right access point and registers its address. Communications between end node and host computer  
can then be transmitted up and down the backbone.  
As the user moves on, the end node’s RF transmitter regularly checks the system to determine whether it is in  
touch with the original access point or whether it should seek a new one. When a node no longer receives  
acknowledgment from its original access point, it undertakes a new search. Upon finding a new access point, it  
then re-registers, and the communication process continues.  
What is ISM band?  
The FCC and their counterparts outside of the U.S. have set aside bandwidth for unlicensed use in the ISM  
(Industrial, Scientific and Medical) band. Spectrum in the vicinity of 2.4 GHz, in particular, is being made available  
worldwide. This presents a truly revolutionary opportunity to place convenient high-speed wireless capabilities in  
the hands of users around the globe.  
What is Spread Spectrum?  
Spread Spectrum technology is a wideband radio frequency technique developed by the military for use in  
reliable, secure, mission-critical communications systems. It is designed to trade off bandwidth efficiency for  
reliability, integrity, and security. In other words, more bandwidth is consumed than in the case of narrowband  
transmission, but the trade-off produces a signal that is, in effect, louder and thus easier to detect, provided that  
the receiver knows the parameters of the spread-spectrum signal being broadcast. If a receiver is not tuned to  
the right frequency, a spread-spectrum signal looks like background noise. There are two main alternatives,  
Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS).  
What is DSSS? What is FHSS? And what are their differences?  
Frequency-Hopping Spread-Spectrum (FHSS) uses a narrowband carrier that changes frequency in a pattern that  
is known to both transmitter and receiver. Properly synchronized, the net effect is to maintain a single logical  
channel. To an unintended receiver, FHSS appears to be short-duration impulse noise. Direct-Sequence Spread-  
Spectrum (DSSS) generates a redundant bit pattern for each bit to be transmitted. This bit pattern is called a chip  
(or chipping code). The longer the chip, the greater the probability that the original data can be recovered. Even if  
one or more bits in the chip are damaged during transmission, statistical techniques embedded in the radio can  
recover the original data without the need for retransmission. To an unintended receiver, DSSS appears as low  
power wideband noise and is rejected (ignored) by most narrowband receivers.  
What is WEP?  
WEP is Wired Equivalent Privacy, a data privacy mechanism based on a 64-bit or 128-bit shared key algorithm, as  
described in the IEEE 802.11 standard.  
What is a MAC Address?  
The Media Access Control (MAC) address is a unique number assigned by the manufacturer to any Ethernet  
networking device, such as a network adapter, that allows the network to identify it at the hardware level. For all  
Appendix A: Troubleshooting  
Frequently Asked Questions  
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practical purposes, this number is usually permanent. Unlike IP addresses, which can change every time a  
computer logs onto the network, the MAC address of a device stays the same, making it a valuable identifier for  
the network.  
How do I reset the Router?  
Press the Reset button on the back panel for about ten seconds. This will reset the Router to its default settings.  
How do I resolve issues with signal loss?  
There is no way to know the exact range of your wireless network without testing. Every obstacle placed between  
the Router and a wireless PC will create signal loss. Lead glass, metal, concrete floors, water and walls will  
inhibit the signal and reduce range. Start with the Router and your wireless PC in the same room and move it  
away in small increments to determine the maximum range in your environment.  
You may also try using different channels, as this may eliminate interference affecting only one channel.  
I have excellent signal strength, but I cannot see my network.  
Wireless security is probably enabled on the Router, but not on your wireless adapter (or vice versa). Verify that  
the same wireless security method and settings are being used on all devices of your wireless network.  
How many channels/frequencies are available with the Router?  
There are eleven available channels, ranging from 1 to 11 (in North America).  
If your questions are not addressed here, refer to the Linksys website, www.linksys.com.  
Appendix A: Troubleshooting  
Frequently Asked Questions  
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Appendix B: Wireless Security  
Linksys wants to make wireless networking as safe and easy for you as possible. The current generation of  
Linksys products provide several network security features, but they require specific action on your part for  
implementation. So, keep the following in mind whenever you are setting up or using your wireless network.  
Security Precautions  
The following is a complete list of security precautions to take (at least steps 1 through 5 should be followed):  
1. Change the default SSID.  
2. Disable SSID Broadcast.  
3. Change the default password for the Administrator account.  
4. Enable MAC Address Filtering.  
NOTE: Some of these security features are  
available only through the network router or  
access point. Refer to the router or access  
point’s documentation for more information.  
5. Change the SSID periodically.  
6. Use the highest encryption algorithm possible. Use WPA if it is available. Please note that this may reduce  
your network performance.  
7. Change the WEP encryption keys periodically.  
For information on implementing these security features, refer to “Chapter 5: Configuring the Wireless-G  
Broadband Router.”  
Security Threats Facing Wireless Networks  
Wireless networks are easy to find. Hackers know that in order to join a wireless network, wireless networking  
products first listen for “beacon messages”. These messages can be easily decrypted and contain much of the  
network’s information, such as the network’s SSID (Service Set Identifier). Here are the steps you can take:  
Change the administrator’s password regularly. With every wireless networking device you use, keep in mind  
that network settings (SSID, WEP keys, etc.) are stored in its firmware. Your network administrator is the only  
person who can change network settings. If a hacker gets a hold of the administrator’s password, he, too, can  
change those settings. So, make it harder for a hacker to get that information. Change the administrator’s  
password regularly.  
Appendix B: Wireless Security  
Security Precautions  
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SSID. There are several things to keep in mind about the SSID:  
1. Disable Broadcast  
2. Make it unique  
3. Change it often  
Most wireless networking devices will give you the option of broadcasting the SSID. While this option may be  
more convenient, it allows anyone to log into your wireless network. This includes hackers. So, don’t broadcast  
the SSID.  
Wireless networking products come with a default SSID set by the factory. (The Linksys default SSID is “linksys”.)  
Hackers know these defaults and can check these against your network. Change your SSID to something unique  
and not something related to your company or the networking products you use.  
Change your SSID regularly so that any hackers who have gained access to your wireless network will have to  
start from the beginning in trying to break in.  
MAC Addresses. Enable MAC Address filtering. MAC Address filtering will allow you to provide access to only  
those wireless nodes with certain MAC Addresses. This makes it harder for a hacker to access your network with  
a random MAC Address.  
WEP Encryption. Wired Equivalent Privacy (WEP) is often looked upon as a cure-all for wireless security  
concerns. This is overstating WEP’s ability. Again, this can only provide enough security to make a hacker’s job  
more difficult.  
There are several ways that WEP can be maximized:  
1. Use the highest level of encryption possible  
2. Use “Shared Key” authentication  
IMPORTANT: Always remember that each  
device in your wireless network MUST use the  
same encryption method and encryption key or  
your wireless network will not function properly.  
3. Change your WEP key regularly  
WPA. Wi-Fi Protected Access (WPA) is the newest and best available standard in Wi-Fi security. Two modes are  
available: Pre-Shared Key and RADIUS. Pre-Shared Key gives you a choice of two encryption methods: TKIP  
(Temporal Key Integrity Protocol), which utilizes a stronger encryption method and incorporates Message  
Integrity Code (MIC) to provide protection against hackers, and AES (Advanced Encryption System), which utilizes  
a symmetric 128-Bit block data encryption. RADIUS (Remote Authentication Dial-In User Service) utilizes a  
RADIUS server for authentication and the use of dynamic TKIP, AES, or WEP.  
Appendix B: Wireless Security  
Security Threats Facing Wireless Networks  
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WPA/WPA2 Personal. Select the type of algorithm, TKIP or AES, enter a password in the Personal Key field of  
8-64 characters, and enter a Group Key Renewal time period between 0 and 7,200 seconds, which instructs  
the Router or other device how often it should change the encryption keys.  
WPA/WPA2 Enterprise. WPA used in coordination with a RADIUS server. (This should only be used when a  
RADIUS server is connected to the Router or other device.) First, select the type of WPA algorithm, TKIP or  
AES. Enter the RADIUS server’s IP Address and port number, along with a key shared between the device and  
the server. Last, enter a Group Key Renewal period, which instructs the device how often it should change the  
encryption keys.  
RADIUS. WEP used in coordination with a RADIUS server. (This should only be used when a RADIUS server is  
connected to the Router or other device.) First, enter the RADIUS server’s IP Address and port number, along  
with a key shared between the device and the server. Then, select a WEP key and a level of WEP encryption,  
and either generate a WEP key through the Passphrase or enter the WEP key manually.  
Implementing encryption may have a negative impact on your network’s performance, but if you are transmitting  
sensitive data over your network, encryption should be used.  
These security recommendations should help keep your mind at ease while you are enjoying the most flexible  
and convenient technology Linksys has to offer.  
Appendix B: Wireless Security  
Security Threats Facing Wireless Networks  
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Appendix C: Upgrading Firmware  
The Broadband Router's firmware is upgraded through the Web-based Utility's Administration tab. Follow these  
instructions:  
1. Download the firmware from Linksys's website at www.linksys.com.  
2. Extract the firmware file on your PC.  
3. Click Firmware Upgrade from the Web-Utility's Administration tab, and the Upgrade Firmware screen, will  
appear.  
4. Enter the location of the firmware's file or click the Browse button to find the file.  
5. Then, click the Upgrade button to upgrade the firmware.  
Figure C-1: Upgrade Firmware  
Appendix C: Upgrading Firmware  
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Appendix D: Windows Help  
Almost all Linksys wireless products require Microsoft Windows. Windows is the most used operating system in  
the world and comes with many features that help make networking easier. These features can be accessed  
through Windows Help and are described in this appendix.  
TCP/IP  
Before a computer can communicate with the Broadband Router, TCP/IP must be enabled. TCP/IP is a set of  
instructions, or protocol, all PCs follow to communicate over a network. This is true for wireless networks as well.  
Your PCs will not be able to utilize wireless networking without having TCP/IP enabled. Windows Help provides  
complete instructions on enabling TCP/IP.  
Shared Resources  
If you wish to share printers, folder, or files over your network, Windows Help provides complete instructions on  
utilizing shared resources.  
Network Neighborhood/My Network Places  
Other PCs on your network will appear under Network Neighborhood or My Network Places (depending upon the  
version of Windows you're running). Windows Help provides complete instructions on adding PCs to your  
network.  
Appendix D: Windows Help  
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Appendix E: Finding the MAC Address and IP Address for Your  
Ethernet Adapter  
This section describes how to find the MAC address for your computer’s Ethernet adapter so you can use the MAC  
filtering and/or MAC address cloning feature of the Router. You can also find the IP address of your computer’s  
Ethernet adapter. This IP address is used for the Router’s filtering, forwarding, and/or DMZ features. Follow the  
steps in this appendix to find the adapter’s MAC or IP address in Windows 98, Me, 2000, or XP.  
Windows 98SE or Me Instructions  
1. Click Start and Run. In the Open field, enter winipcfg. Then press the Enter key or the OK button.  
Figure E-1: IP Configuration Screen  
2. When the IP Configuration screen appears, select the Ethernet adapter you have connected to the Router via a  
CAT 5 Ethernet network cable.  
3. Write down the Adapter Address as shown on your computer screen. This is the MAC address for your  
Ethernet adapter and is shown as a series of numbers and letters.  
The MAC address/Adapter Address is what you will use for MAC address cloning or MAC filtering.  
Another screen will show the Ethernet adapter’s IP address. (Shown in the example as 192.168.1.100.) Your  
computer may show something different.  
Figure E-2: MAC Address/Adapter Address  
NOTE: The MAC address is also called the Adapter Address.  
Figure E-3: MAC Address/Physical Address  
Appendix E: Finding the MAC Address and IP Address for Your Ethernet Adapter  
Windows 98SE or Me Instructions  
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Windows 2000 or XP Instructions  
1. Click Start and Run. In the Open field, enter cmd. Press the Enter key or click the OK button.  
2. At the command prompt, enter ipconfig /all. Then press the Enter key.  
3. Write down the Physical Address as shown on your computer screen; it is the MAC address for your Ethernet  
adapter. This appears as a series of numbers and letters.  
The MAC address/Physical Address is what you will use for MAC address cloning or MAC filtering.  
NOTE: The MAC address is also called the Physical Address.  
Figure E-4: MAC Address Clone  
Another screen will show the Ethernet adapter’s IP address. (Shown in the example as 192.168.1.100.) Your  
computer may show something different.  
For the Router’s Web-based Utility  
For MAC address cloning, enter the 12-digit MAC address in the MAC Address fields provided, two digits per field.  
For wireless MAC filtering, enter the 12-digit MAC address in this format, XXXXXXXXXXXX, WITHOUT the hyphens.  
Figure E-5: Wireless MAC Filter List  
Appendix E: Finding the MAC Address and IP Address for Your Ethernet Adapter  
Windows 2000 or XP Instructions  
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Appendix F: Glossary  
This glossary contains some basic networking terms you may come across when using this product. For more  
advanced terms, see the complete Linksys glossary at http://www.linksys.com/glossary.  
Access Point - A device that allows wireless-equipped computers and other devices to communicate with a  
wired network. Also used to expand the range of a wireless network.  
Ad-hoc - A group of wireless devices communicating directly with each other (peer-to-peer) without the use of  
an access point.  
AES (Advanced Encryption Standard) - A security method that uses symmetric 128-bit block data encryption.  
Bandwidth - The transmission capacity of a given device or network.  
Bit - A binary digit.  
Boot - To start a device and cause it to start executing instructions.  
Broadband - An always-on, fast Internet connection.  
Browser - An application program that provides a way to look at and interact with all the information on the  
World Wide Web.  
Byte - A unit of data that is usually eight bits long  
Cable Modem - A device that connects a computer to the cable television network, which in turn connects to the  
Internet.  
Daisy Chain - A method used to connect devices in a series, one after the other.  
DDNS (Dynamic Domain Name System) - Allows the hosting of a website, FTP server, or e-mail server with a  
fixed domain name (e.g., www.xyz.com) and a dynamic IP address.  
Default Gateway - A device that forwards Internet traffic from your local area network.  
DHCP (Dynamic Host Configuration Protocol) - A networking protocol that allows administrators to assign  
temporary IP addresses to network computers by “leasing” an IP address to a user for a limited amount of time,  
instead of assigning permanent IP addresses.  
Appendix F: Glossary  
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DMZ (Demilitarized Zone) - Removes the Router's firewall protection from one PC, allowing it to be “seen” from  
the Internet.  
DNS (Domain Name Server) - The IP address of your ISP's server, which translates the names of websites into IP  
addresses.  
Domain - A specific name for a network of computers.  
Download - To receive a file transmitted over a network.  
DSL (Digital Subscriber Line) - An always-on broadband connection over traditional phone lines.  
Dynamic IP Address - A temporary IP address assigned by a DHCP server.  
EAP (Extensible Authentication Protocol) - A general authentication protocol used to control network access.  
Many specific authentication methods work within this framework.  
Encryption - Encoding data transmitted in a network.  
Ethernet - IEEE standard network protocol that specifies how data is placed on and retrieved from a common  
transmission medium.  
Firewall - A set of related programs located at a network gateway server that protects the resources of a  
network from users from other networks.  
Firmware - The programming code that runs a networking device.  
FTP (File Transfer Protocol) - A protocol used to transfer files over a TCP/IP network.  
Full Duplex - The ability of a networking device to receive and transmit data simultaneously.  
Gateway - A device that interconnects networks with different, incompatible communications protocols.  
Half Duplex - Data transmission that can occur in two directions over a single line, but only one direction at a  
time.  
HTTP (HyperText Transport Protocol) - The communications protocol used to connect to servers on the World  
Wide Web.  
Infrastructure - A wireless network that is bridged to a wired network via an access point.  
IP (Internet Protocol) - A protocol used to send data over a network.  
Appendix F: Glossary  
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IP Address - The address used to identify a computer or device on a network.  
IPCONFIG - A Windows 2000 and XP utility that displays the IP address for a particular networking device.  
IPSec (Internet Protocol Security) - A VPN protocol used to implement secure exchange of packets at the IP layer.  
ISP (Internet Service Provider) - A company that provides access to the Internet.  
LAN - The computers and networking products that make up your local network.  
MAC (Media Access Control) Address - The unique address that a manufacturer assigns to each networking  
device.  
Mbps (MegaBits Per Second) - One million bits per second; a unit of measurement for data transmission.  
NAT (Network Address Translation) - NAT technology translates IP addresses of a local area network to a different  
IP address for the Internet.  
Network - A series of computers or devices connected for the purpose of data sharing, storage, and/or  
transmission between users.  
Packet - A unit of data sent over a network.  
Passphrase - Used much like a password, a passphrase simplifies the WEP encryption process by automatically  
generating the WEP encryption keys for Linksys products.  
Ping (Packet INternet Groper) - An Internet utility used to determine whether a particular IP address is online.  
POP3 (Post Office Protocol 3) - A standard mail server commonly used on the Internet.  
Port - The connection point on a computer or networking device used for plugging in cables or adapters.  
Power over Ethernet (PoE) - A technology enabling an Ethernet network cable to deliver both data and power.  
PPPoE (Point to Point Protocol over Ethernet) - A type of broadband connection that provides authentication  
(username and password) in addition to data transport.  
PPTP (Point-to-Point Tunneling Protocol) - A VPN protocol that allows the Point to Point Protocol (PPP) to be  
tunneled through an IP network. This protocol is also used as a type of broadband connection in Europe.  
RADIUS (Remote Authentication Dial-In User Service) - A protocol that uses an authentication server to control  
network access.  
Appendix F: Glossary  
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RJ-45 (Registered Jack-45) - An Ethernet connector that holds up to eight wires.  
Roaming - The ability to take a wireless device from one access point's range to another without losing the  
connection.  
Router - A networking device that connects multiple networks together.  
Server - Any computer whose function in a network is to provide user access to files, printing, communications,  
and other services.  
SMTP (Simple Mail Transfer Protocol) - The standard e-mail protocol on the Internet.  
SNMP (Simple Network Management Protocol) - A widely used network monitoring and control protocol.  
SPI (Stateful Packet Inspection) Firewall - A technology that inspects incoming packets of information before  
allowing them to enter the network.  
SSID (Service Set IDentifier) - Your wireless network's name.  
Static IP Address - A fixed address assigned to a computer or device that is connected to a network.  
Static Routing - Forwarding data in a network via a fixed path.  
Subnet Mask - An address code that determines the size of the network.  
Switch - 1. A data switch that connects computing devices to host computers, allowing a large number of  
devices to share a limited number of ports. 2. A device for making, breaking, or changing the connections in an  
electrical circuit.  
TCP (Transmission Control Protocol) - A network protocol for transmitting data that requires acknowledgement  
from the recipient of data sent.  
TCP/IP (Transmission Control Protocol/Internet Protocol) - A set of instructions PCs use to communicate over a  
network.  
Telnet - A user command and TCP/IP protocol used for accessing remote PCs.  
TFTP (Trivial File Transfer Protocol) - A version of the TCP/IP FTP protocol that has no directory or password  
capability.  
Throughput - The amount of data moved successfully from one node to another in a given time period.  
Appendix F: Glossary  
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TKIP (Temporal Key Integrity Protocol) - a wireless encryption protocol that provides dynamic encryption keys for  
each packet transmitted.  
Topology - The physical layout of a network.  
TX Rate - Transmission Rate.  
Upgrade - To replace existing software or firmware with a newer version.  
Upload - To transmit a file over a network.  
URL (Uniform Resource Locator) - The address of a file located on the Internet.  
VPN (Virtual Private Network) - A security measure to protect data as it leaves one network and goes to another  
over the Internet.  
WAN (Wide Area Network)- The Internet.  
WEP (Wired Equivalent Privacy) - A method of encrypting network data transmitted on a wireless network for  
greater security.  
WLAN (Wireless Local Area Network) - A group of computers and associated devices that communicate with  
each other wirelessly.  
WPA (Wi-Fi Protected Access) - A wireless security protocol using TKIP (Temporal Key Integrity Protocol)  
encryption, which can be used in conjunction with a RADIUS server.  
Appendix F: Glossary  
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Appendix G: Specifications  
Model  
WRT54GX4  
Standards  
Channels  
IEEE 802.3, IEEE 802.3u, IEEE 802.11g, IEEE 802.11b  
11 Channels (US, Canada)  
13 Channels (Europe)  
Ports/Buttons  
Internet: One 10/100 RJ-45 Port  
LAN: Four 10/100 RJ-45 Switched Ports  
One Power Port  
One Reset Button  
Cabling Type  
LEDs  
UTP CAT 5  
Power, DMZ, Wireless, Ethernet (1, 2, 3, 4), Internet  
20 dBm for Wireless-B/20 dBm for Wireless-G  
Able  
Transmit Power  
UPnP able/cert  
Security Features  
Wireless Security  
Stateful Packet Inspection (SPI) Firewall  
WPA, WPA2, 802.1x, WEP, and Wireless MAC Filtering  
Dimensions  
(W x H x D)  
5.51" x 5.51" x 1.42"  
(140 mm x 140 mm x 36 mm)  
Unit Weight  
Power  
14.7 oz. (0.417 kg)  
External, 12V DC, 1.0A  
Certification  
FCC, IC-03, CE, Wi-Fi (802.11b, 802.11g, WPA)  
Appendix G: Specifications  
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Operating Temp.  
Storage Temp.  
Operating Humidity  
Storage Humidity  
Warranty  
0° C to 40° C (32° F to 104° F)  
-10° C to 65° C (14° F to 149° F)  
15% to 95% Non-Condensing  
5% to 80% Non-Condensing  
3-Years Limited  
Appendix G: Specifications  
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Appendix H: Warranty Information  
LIMITED WARRANTY  
Linksys warrants to You that, for a period of three years (the “Warranty Period”), your Linksys Product will be substantially  
free of defects in materials and workmanship under normal use. Your exclusive remedy and Linksys' entire liability under  
this warranty will be for Linksys at its option to repair or replace the Product or refund Your purchase price less any  
rebates. This limited warranty extends only to the original purchaser.  
If the Product proves defective during the Warranty Period call Linksys Technical Support in order to obtain a Return  
Authorization Number, if applicable. BE SURE TO HAVE YOUR PROOF OF PURCHASE ON HAND WHEN CALLING. If You are  
requested to return the Product, mark the Return Authorization Number clearly on the outside of the package and include a  
copy of your original proof of purchase. RETURN REQUESTS CANNOT BE PROCESSED WITHOUT PROOF OF PURCHASE. You  
are responsible for shipping defective Products to Linksys. Linksys pays for UPS Ground shipping from Linksys back to You  
only. Customers located outside of the United States of America and Canada are responsible for all shipping and handling  
charges.  
ALL IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED  
TO THE DURATION OF THE WARRANTY PERIOD. ALL OTHER EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND  
WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF NON-INFRINGEMENT, ARE DISCLAIMED. Some jurisdictions do not  
allow limitations on how long an implied warranty lasts, so the above limitation may not apply to You. This warranty gives  
You specific legal rights, and You may also have other rights which vary by jurisdiction.  
This warranty does not apply if the Product (a) has been altered, except by Linksys, (b) has not been installed, operated,  
repaired, or maintained in accordance with instructions supplied by Linksys, or (c) has been subjected to abnormal  
physical or electrical stress, misuse, negligence, or accident. In addition, due to the continual development of new  
techniques for intruding upon and attacking networks, Linksys does not warrant that the Product will be free of  
vulnerability to intrusion or attack.  
TO THE EXTENT NOT PROHIBITED BY LAW, IN NO EVENT WILL LINKSYS BE LIABLE FOR ANY LOST DATA, REVENUE OR  
PROFIT, OR FOR SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, REGARDLESS OF THE THEORY  
OF LIABILITY (INCLUDING NEGLIGENCE), ARISING OUT OF OR RELATED TO THE USE OF OR INABILITY TO USE THE PRODUCT  
(INCLUDING ANY SOFTWARE), EVEN IF LINKSYS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. IN NO EVENT  
WILL LINKSYS’ LIABILITY EXCEED THE AMOUNT PAID BY YOU FOR THE PRODUCT. The foregoing limitations will apply even  
if any warranty or remedy provided under this Agreement fails of its essential purpose. Some jurisdictions do not allow the  
exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to You.  
Please direct all inquiries to: Linksys, P.O. Box 18558, Irvine, CA 92623 USA.  
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Appendix I: Regulatory Information  
FCC Statement  
This product has been tested and complies with the specifications for a Class B digital device, pursuant to Part 15 of the  
FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential  
installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used  
according to the instructions, may cause harmful interference to radio communications. However, there is no guarantee  
that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or  
television reception, which is found by turning the equipment off and on, the user is encouraged to try to correct the  
interference by one or more of the following measures:  
•
•
•
•
Reorient or relocate the receiving antenna  
Increase the separation between the equipment or devices  
Connect the equipment to an outlet other than the receiver's  
Consult a dealer or an experienced radio/TV technician for assistance  
FCC Radiation Exposure Statement  
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment  
should be installed and operated with minimum distance 20cm between the radiator and your body.  
Safety Notices  
Caution: To reduce the risk of fire, use only No.26 AWG or larger telecommunication line cord.  
Do not use this product near water, for example, in a wet basement or near a swimming pool.  
Avoid using this product during an electrical storm. There may be a remote risk of electric shock from lightning.  
Industry Canada (Canada)  
This device complies with Canadian ICES-003 and RSS210 rules.  
Cet appareil est conforme aux normes NMB-003 et RSS210 d'Industry Canada.  
Appendix I: Regulatory Information  
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Wireless-G Broadband Router with SRX400  
User Information for Consumer Products Covered by EU Directive 2002/96/EC on Waste Electric and Electronic  
Equipment (WEEE)  
This document contains important information for users with regards to the proper disposal and recycling of Linksys  
products. Consumers are required to comply with this notice for all electronic products bearing the following symbol:  
Appendix I: Regulatory Information  
76  
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Wireless-G Broadband Router with SRX400  
Appendix I: Regulatory Information  
77  
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Wireless-G Broadband Router with SRX400  
Appendix I: Regulatory Information  
78  
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Wireless-G Broadband Router with SRX400  
Appendix I: Regulatory Information  
79  
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Dual-Band Wireless Access Point  
For more information, visit www.linksys.com.  
Appendix I: Regulatory Information  
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Wireless-G Broadband Router with SRX400  
Appendix J: Contact Information  
Need to contact Linksys?  
Visit us online for information on the latest products and updates  
to your existing products at:  
http://www.linksys.com or  
ftp.linksys.com  
Can't find information about a product you want to buy  
on the web? Do you want to know more about networking  
with Linksys products? Give our advice line a call at:  
Or fax your request in to:  
800-546-5797 (LINKSYS)  
949-823-3002  
If you experience problems with any Linksys product,  
you can call us at:  
800-326-7114  
Don't wish to call? You can e-mail us at:  
support@linksys.com  
If any Linksys product proves defective during its warranty period,  
you can call the Linksys Return Merchandise Authorization  
department for obtaining a Return Authorization Number at:  
(Details on Warranty and RMA issues can be found in the Warranty  
Information section in this Guide.)  
949-823-3000  
81  
Appendix J: Contact Information  
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