Linksys Network Router BEFSR41 v2 User Manual
Instant Broadband™ Series  
®
EtherFast  
Cable/DSL Routers  
Use this User Guide to install the following Linksys product(s):  
BEFSRU31  
BEFSR41 v2 EtherFast Cable/DSL Router with 10/100 4-Port Switch  
BEFSR11 EtherFast 1-Port Cable/DSL Router  
EtherFast Cable/DSL Router with USB Port and 10/100 3-Port Switch  
User Guide  
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Instant Broadband Series  
EtherFast Cable/DSL Routers  
Table of Contents  
Introduction  
The Linksys EtherFast Cable/DSL Router  
Features  
Package Contents for the 4-Port Router  
Network Requirements  
Package Contents for the 1-Port Router  
Network Requirements  
Package Contents for the 3-Port Router  
Network Requirements  
Configuring Your Network with the  
Cable/DSL Router  
1
1
1
2
2
3
3
4
4
33  
34  
36  
Configuring Your Cable/DSL Router  
Configuring Your PCs to Connect to the Cable/DSL Router  
The Cable/DSL Router’s Web-based Utility  
Quick and Easy Router Administration  
Setup  
Password  
Status  
38  
38  
39  
41  
43  
44  
45  
47  
49  
50  
51  
53  
54  
DHCP  
Help  
Getting to Know the 4-Port  
EtherFast Cable/DSL Router  
The 4-Port Router’s Rear Panel  
5
5
6
IP Filtering  
IP Forwarding  
Dynamic Routing  
Static Routing  
DMZ Hosting  
Logging  
The 4-Port Router’s Front Panel LEDs  
Getting to Know the 1-Port  
EtherFast Cable/DSL Router  
The 1-Port Router’s Rear Panel  
8
8
The 1-Port Router’s Front Panel LEDs  
9
Troubleshooting  
Common Problems  
Frequently Asked Questions  
55  
55  
57  
Getting to Know the 3-Port  
EtherFast Cable/DSL Router  
The 3-Port Router’s Rear Panel  
The USB Icon  
11  
11  
12  
13  
Appendix  
How to Ping Your ISP’s E-mail & Web Addresses  
Installing the TCP/IP Protocol  
Twisted-Pair Cabling  
Crimping Your Own Network Cables  
4-Port Router Specifications  
Environmental Specifications  
1-Port Router Specifications  
Environmental Specifications  
3-Port Router Specifications  
Environmental Specifications  
Customer Support  
61  
61  
64  
66  
67  
68  
68  
69  
69  
70  
70  
71  
The 3-Port Router’s Front Panel LEDs  
Connecting Your Cable/DSL Router  
to Your Network  
Overview  
15  
15  
15  
16  
18  
20  
LANs and WANs  
IP Addresses: A Quick Lesson  
Connecting Your Hardware Together & Booting Up  
Uplinking: Connecting More Devices to Your Router  
Configuring Your Router’s USB Port  
Windows 98 Configuration  
21  
21  
25  
29  
Windows 2000 Configuration  
Windows Millennium Configuration  
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EtherFast Cable/DSL Routers  
Package Contents for the 4-Port Router  
Introduction  
The Linksys EtherFast Cable/DSL Router  
Congratulations on the purchase of your EtherFast Cable/DSL Router from  
Linksys! The EtherFast Cable/DSL Router is the perfect solution for connect-  
ing a network of PCs to a high-speed broadband Internet connection and to  
an Ethernet network backbone. Configurable as a DHCP server, the EtherFast  
Cable/DSL Router is the only visible network device on the Internet. The  
Router also serves as your Internet firewall, protecting your network’s PCs  
from being accessed by external users. All incoming data packets are moni-  
tored and filtered. Your Router can also be configured to block internal users'  
access to the Internet with IP Filtering, as well as play Internet games, video-  
conference, and much more.  
Now all of your PCs can enjoy lightning-fast broadband Internet connections  
and share internal network data. Link it all together and your network will  
blaze along faster than you ever thought possible.  
• One EtherFast Cable/DSL Router with 10/100 4-Port Switch  
• One Power Adapter  
• One Power Cord  
• One User Guide and Registration Card  
Features  
• Connects to a Broadband Modem and to an Ethernet Network Backbone  
• Equipped With a 3 or 4-Port 10/100 Switch (BEFSRU31 & BEFSR41 v2  
only)  
• Connects All of Your PCs to the Internet with Just One IP Address  
• Firewall Protects Your PCs From Outside Intruders on the Internet  
• Configurable Through a PC’s Web Browser Using Netscape Navigator 4.0  
or Internet Explorer 4.0  
• Supports IPSec Pass-Through for Virtual Private Networking (VPNs)  
• Administer Your Router Remotely Over the Internet  
• 10/100 Switch Speeds Up Your Gaming and Multimedia Connections  
(BEFSRU31 & BEFSR41 v2 only)  
Network Requirements  
• One RJ-45 broadband Internet connection, with a cable or DSL modem  
• One PC with a 10Mbps or 10/100 Mbps Ethernet card or adapter installed  
• TCP/IP network protocol installed on each PC  
• UTP CAT 5 network cables with RJ-45 connectors  
• Internet Explorer 4.0 and higher, or Netscape Navigator 4.0 and higher  
• Configurable as a DHCP Server on Your Network  
Version 5.5 for Internet Explorer and Version 4.7 for Netscape  
Navigator are highly recommended for optimal results.  
• Compatible with Virtually All Standard Internet Applications  
• Administrators Can Block Specific Internal Users' Internet Access  
• DMZ Hosting Feature Enables Internet Multimedia Applications  
Such as Video-Conferencing and Internet Gaming  
1
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EtherFast Cable/DSL Routers  
Package Contents for the 1-Port Router  
Package Contents for the 3-Port Router  
• One EtherFast 10/100 1-Port Cable/DSL Router  
• One Power Adapter  
• One User Guide and Registration Card  
• One EtherFast Cable/DSL Router with USB Port & 10/100 3-Port Switch  
• One USB Cable  
• One 3.5” Floppy Disk for USB Setup  
• One Power Adapter  
• One User Guide and Registration Card  
Network Requirements  
Network Requirements  
• One RJ-45 broadband Internet connection, with a cable or DSL modem  
• One PC with a 10/100 Mbps Ethernet card or adapter installed  
• TCP/IP network protocol installed on each PC  
• One RJ-45 broadband Internet connection, with a cable or DSL modem  
• One PC with a 10/100 Mbps Ethernet card or adapter installed,  
or a PC with a USB port  
• UTP CAT 5 network cables with RJ-45 connectors  
• TCP/IP network protocol installed on each PC  
• Internet Explorer 4.0 and higher, or Netscape Navigator 4.0 and higher  
• UTP CAT 5 network cables with RJ-45 connectors  
• Internet Explorer 4.0 and higher, or Netscape Navigator 4.0 and higher  
Version 5.5 for Internet Explorer and Version 4.7 for Netscape  
Navigator are highly recommended for optimal results.  
Version 5.5 for Internet Explorer and Version 4.7 for Netscape  
Navigator are highly recommended for optimal results.  
3
4
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EtherFast Cable/DSL Routers  
4-Port Router’s Front Panel LEDs  
Getting to Know the 4-Port  
EtherFast Cable/DSL Router  
The 4-Port Router’s Rear Panel  
Your Router’s ports, where network cables are connected, are located on the  
rear panel of your Router.  
The LAN Indicators  
BEFSR41 v2 shown above  
Power  
Green. The Power LED lights up when the Router is pow-  
ered on.  
Link/Act  
Green. The Link/Act LED serves two purposes. If the LED  
is continuously lit up, the Router is successfully connected  
to a device through the corresponding port (1, 2, 3 or 4). If  
the LED is flickering, the Router is actively sending or  
receiving data over that port.  
BEFSR41 v2 shown above  
The 4-Port Router’s Ports  
Full/Col  
Green. The Full/Col LED also serves two purposes. If this  
LED is lit up continuously, the connection made through  
the corresponding port is running in Full Duplex mode. If  
the LED flickers, the connection is experiencing collisions.  
Infrequent collisions are normal.  
WAN  
The WAN (Wide Area Network) port is where you  
connect your cable or DSL modem.  
Ports 1-4  
Uplink  
These four LAN (Local Area Network) ports con-  
nect to network devices, such as PCs, print servers,  
and remote hard drives. If port 1 is being used, the  
Uplink port will not work- these two shared ports  
have internally shared wiring.  
If this LED flickers too often, there may be a problem with  
your connection. See the Troubleshooting section if you  
have problems.  
The Uplink port is used to expand your network  
by connecting to another switch or hub. Uplinking  
to another Router, switch or a hub is done by sim-  
ply running a cable from the Uplink port to the  
other device. See page 10 for more on uplinking.  
100  
Orange. The 100 LED lights up when a successful  
100Mbps connection is made through the corresponding  
port.  
If this LED is not lighting up, then your connection speed is  
10 Mbps.  
If the Uplink port is being used, Port 1 will not  
work.  
Power  
The Power port is where you will connect the  
power adapter. Be sure to connect the power cord  
to the power adapter before plugging it in.  
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The WAN Indicators  
Getting to Know the 1-Port  
EtherFast Cable/DSL Router  
The One-Port Router’s Rear Panel  
Link  
Green. The Link LED lights up when a successful connec-  
tion is made between the Router and your broadband device  
or network.  
Act  
Green. The Act LED flickers when the Router is sending or  
receiving data over the broadband WAN port (to the  
Internet).  
The rear panel of the Router is where all of the Router’s cabling connections  
are made, and where you can reset or configure the Router’s LAN port.  
Diag  
Orange. The Diag LED lights up when the Router goes  
through its self-diagnosis mode during every boot-up, and  
also when you click Apply to update any changes made in  
the Router’s Utility. It will turn off upon successful comple-  
tion of the diagnosis.  
If this LED stays on for an abnormally long period of time,  
see the Troubleshooting section.  
*
The Reset Button The Reset button can be used in one of two ways.  
BEFSR11 shown above  
The One-Port Router’s Ports  
1. If your Router is having problems connecting to the Internet, press the  
Reset button in for just a moment with a paper clip or a pencil tip. This  
clears up any jammed connections, and is similar to pressing the Reset but-  
ton on your PC to reboot it.  
WAN  
LAN  
The WAN (Wide Area Network) port is where you  
connect your cable or DSL modem.  
The LAN (Local Area Network) port is where you  
connect your Router to a PC, hub, or switch. If  
you have more than one PC, connect an Ethernet  
hub or switch to your Router, then connect your  
PCs to that hub or switch.  
2. If you are experiencing extreme problems with your Router and have tried  
all other troubleshooting measures, press the Reset Button in and hold it  
down until the orange Diag LED on the front panel turns on and off  
completely.  
This will restore factory defaults and clear all of the Router’s settings,  
including the IP addresses you entered.  
Power  
The Power port connects to the power adapter.  
Leaving the power off for too long could result in the loss of network con-  
nections.  
See also restoring factory defaults through the Web-based Utility in the  
Cable/DSL Router’s Web-based Utility section.  
* The Reset Button is located on the front panel of the 4-Port Router, and the rear panel of the  
3-Port Router and the 1-Port Router.  
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Link/Act  
Green. The Link/Act LED serves two purposes. If the LED  
Buttons & Switches  
is continuously lit up, the Router is successfully connected  
to a device through the LAN port. If the LED is flickering,  
the Router is actively sending or receiving data through the  
LAN port.  
The Reset Button  
Details on the Reset button are found on page 7.  
The Crossover Switch The Crossover Switch (X II) toggles the LAN port  
between crossover mode (X) and straight-through  
mode (II).  
Full/Col  
Green. The Full/Col LED also serves two purposes. If this  
LED remains lit, a LAN port connection is being success-  
fully maintained. If the LED flickers, the connection is  
experiencing collisions. Infrequent collisions are normal.  
If you are connecting the Router’s LAN Port  
directly to a PC or an uplink port on a hub or  
switch, choose the crossover (X) mode.  
If this LED flickers too often, there may be a problem with  
your connection. See Troubleshooting on page 56 if you  
encounter problems.  
If you are connecting the Router’s LAN port to a  
standard port on a hub or switch, choose the  
straight-through (II) mode.  
10/100  
Orange. The 10/100 LED lights up when a successful  
100Mbps connection is made through the corresponding  
port.  
Note: If you’re not sure which mode to use on the Crossover Switch, check the  
LAN port’s Link LED on the front panel of the Router.  
If the Link LED does not light up after the Router is fully installed and config-  
ured, try switching the Crossover Switch to the other side. If the Link LED lights  
up, you know that your mode setting is correct.  
If a connection is running at 10Mbps, the 10/100 LED will  
not light up.  
The WAN Indicators  
When“uplinking,” or connecting two pieces of network hardware together, such  
as a router and a switch, a general rule of thumb is to plug one end of a network  
cable into a straight-through port, and the other end into a crossover port.  
Link  
Green. The Link LED lights up when a successful connec-  
tion is made between the Router and your Broadband  
device or network.  
Standard ports are straight-through ports, and uplink ports are crossover ports.  
The 1-Port Router’s Front Panel LEDs  
Act  
Green. The Act LED flickers when the Router is sending or  
receiving data over the broadband WAN port.  
Diag  
Red. The Diag LED lights up when the Router goes through  
its self-diagnostic test during boot-up. It will turn off upon  
successful completion of the diagnosis. The Diag LED also  
lights up when you press the Reset button or click Apply to  
save any changes made in the Web-based Utility.  
BEFSR11 shown above  
If this LED stays on for an abnormally long period of time,  
see the Troubleshooting section.  
The LAN Indicators  
Power  
Green. The Power LED lights up green when the Router is  
powered on.  
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The USB Icon  
Getting to Know the 3-Port  
This USB icon denotes the presence of a USB port or connector.  
EtherFast Cable/DSL Router  
The 3-Port Router’s Rear Panel Ports  
Your 3-Port Router comes with a USB cable that has two different types of  
connectors. Type A, the master connector, is shaped like a rectangle and  
plugs into your PC’s USB port. Type B, the slave connector, resembles a  
square and connects to the USB port on the rear panel of your Router.  
The 3-Port Router’s Ports  
BEFSRU31 shown above  
USB  
The USB port (Type B - slave) can connect to  
a USB-ready PC or a USB hub. This allows  
you to enjoy an immediate, plug-and-play connec-  
tion without even configuring a network adapter  
for your PC. To work with USB ports, your PC  
must be running Windows 98, 2000, or  
Millennium.  
USB Type B  
USB Type A  
USB ports do not work on PCs running  
1, 2, 3  
These three LAN ports connect to your PCs, hubs,  
switches, print servers, or any other device with an  
Ethernet port.  
Windows 95 or Windows NT.  
Uplink  
The Uplink port connects to another hub or switch  
for port expansion when you run out of open ports  
for your network devices. Since the Uplink port  
and the standard port right next to it share internal  
wiring, you can only use one of the two ports at a  
time.  
USB Compatibility with Your PC  
To use the USB port on the 3-Port Router, you must have Windows 98, 2000, or  
Millennium installed on your PC. USB cannot run in a Windows 95 or NT environ-  
ment.  
Also, your PC must have a USB port installed and enabled. Some PCs may have a  
disabled USB port. If your port doesn’t seem to be working, there may be jumpers  
on the motherboard or a menu option in the BIOS to enable a PC’s USB port.  
WAN  
Power  
This WAN port connects to your cable or DSL  
modem. Your modem connection will not work  
from any other port.  
Other motherboards have USB interfaces, but no ports. You can install your own  
USB port and attach it to your PC’s motherboard using hardware purchased at retail  
computer stores. See your PC’s User Guide for instructions.  
The Power port connects to the power adapter.  
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100  
Orange. The 100 LED lights up when a  
successful 100Mbps connection is made  
through the corresponding port. If this  
LED does not light up, then your connec-  
tion speed is 10 Mbps.  
Buttons  
The Reset Button  
Details on the Reset button are found on page 7.  
The 3-Port Router’s Front Panel LEDs  
USB  
The USB LED lights up when the USB  
port is successfully connected to a PC,  
USB hub, or other USB device.  
The WAN Indicators  
Link  
Green. The Link LED lights up when a successful connec-  
tion is made between the Router and your broadband device  
or network.  
The LAN Indicators  
Act  
Green. The Act LED flickers when the Router is sending or  
receiving data over the broadband WAN port.  
Power  
Green. The Power LED lights up green when the  
Router is powered on.  
Diag  
Orange. The Diag LED lights up when the Router goes  
through its self-diagnostic test during boot-up. It will turn  
off upon successful completion of the diagnosis. This LED  
will also light up when you make changes in the Utility and  
click Apply to save them.  
Link/Act  
Green. The Link/Act LED serves two purposes. If  
the LED is continuously lit up, the Router is suc-  
cessfully connected to a device through the corre-  
sponding RJ-45 port (1, 2, or 3). If the LED flick-  
ers, then that port is sending or receiving data to  
and from the network.  
If this LED stays on for an abnormally long period of time,  
see the Troubleshooting section.  
Full/Col  
Green. The Full/Col LED also serves two purpos-  
es. If this LED is continuously lit up, the connec-  
tion made through the corresponding port is suc-  
cessfully running in Full Duplex mode. If the  
LED is flickering, the connection is experiencing  
collisions. Infrequent collisions are normal.  
If this LED flickers too often, there may be a  
problem with your connection. See the  
Troubleshooting section if you have problems.  
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Your Router’s firewall (NAT) protects your network of PCs with security so  
users on the public, Internet side cannot “see” your PCs. This is why  
your internal LAN, or network, is private.  
Connecting the Cable/DSL Router to  
Your Network  
Remember that your Router’s ports connect to two sides: your 10/100 LAN  
port(s) and the Internet WAN port. The LAN port(s) transmit data at 10Mbps  
or 100 Mbps, whereas the broadband port, or WAN port, transmits data at 10  
Mbps, because 10Mbps is currently the maximum speed for cable and DSL  
service.  
Overview  
Unlike a hub or a switch, the Cable/DSL Router’s setup consists of more than  
simply plugging hardware together. Since the Router acts as a DHCP server,  
you will have to set some values for the Router and also configure your net-  
worked PCs to accept the IP addresses that the Router assigns them.  
IP Addressing: A Quick Lesson  
You will need the following data from your ISP (Internet Service Provider) to  
install the Cable/DSL Router:  
What’s an IP Address?  
IP stands for Internet Protocol.  
Every device on an IP-based network, including PCs, print servers, and  
routers, requires an IP address to identify  
• Your broadband-configured PCs’ Computer Name and Workgroup Name  
• Your broadband-configured PCs’ fixed  
Since your Router is a device that  
connects two networks, it needs two  
IP addresses - one for the LAN side,  
and one for the WAN side. In this  
User Guide, you’ll see references to  
the “WAN IP address” and the “LAN  
IP address.”  
its “location,” or address, on the network.  
Since the Internet is simply one huge global  
network, every PC that logs on to the  
Internet also requires an IP address.  
Internet IP Address  
• Your Subnet Mask  
Only if applicable  
}
• Your Default Gateway  
• Your Primary DNS Server IP address(es)  
There are two ways of assigning an IP  
address to your network devices.  
The installation technician from your ISP should have left this information  
with you after the installation. Or, you can call your ISP to request the data.  
Since the Router has firewall security  
(NAT), the only IP address that can  
be seen from the Internet for your  
network is the Router’s WAN IP  
address.  
Static IP Addresses  
Once you have the above values, you can begin the Installation and Setup of  
your EtherFast Cable/DSL Router.  
A static IP address is a fixed IP address  
that you assign manually to a PC or other  
device on the network. Since a static IP  
address remains valid until you disable it,  
static IP addressing ensures that the device  
you assigned it to will always have that  
same IP address. Static IP addresses are  
commonly used with network devices such  
as server PCs or print servers.  
LANs and WANs  
Simply put, a router is a network device that connects two networks together.  
However, even this WAN IP address  
for the Router can be blocked, so that  
your Router and network seem invisi-  
ble to the Internet - see Blocking  
WAN Requests on page 48.  
In this instance, your EtherFast Cable/DSL Router connects your Local Area  
Network (LAN), or the group of PCs in your home or office, to the Wide  
Area Network (WAN), that is, the Internet. Your Router processes and regu-  
lates the data that travels between these two networks.  
If you use your Router to share your cable or DSL Internet connection, con-  
tact your ISP to find out if they have assigned a static IP address to your  
account. If so, you will need that static IP address when configuring your  
Router.  
Think of your Router as a network device with two sides: the first side is  
made up of your private Local Area Network (LAN) of PCs, which this User  
Guide sometimes calls the “internal LAN.” The other, public side is  
the Internet, or the Wide Area Network (WAN), outside of your home or  
office.  
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Dynamic IP Addresses  
Connecting Your Hardware Together and Booting Up  
A dynamic IP address is automatically assigned to a device on the network,  
e.g., PCs and print servers. These IP addresses are called “dynamic” because  
they are only temporarily assigned to the PC or device. After a certain time  
period, they expire.  
1. Before you begin, make sure that all of your hardware is powered off,  
including your Router, PCs, hubs, switches, and the cable or DSL modem.  
2. A. If you have the 4-Port Cable/DSL Router, connect one end of a net-  
work cable to one of the LAN ports (labeled 1, 2, 3, or 4) on the back of  
the Router, and the other end into a standard port on a network device, e.g.,  
a PC, print server, hub, or switch. See page 66 for details on network  
cabling.  
If a PC logs on to the network (or the Internet) and its dynamic IP address  
has expired, the DHCP server will assign it a new dynamic IP address.  
DHCP (Dynamic Host Configuration Protocol) Servers  
A standard port is any port other than the WAN port  
and the Uplink port. It’s a straight-through port.  
PCs and other network devices using dynamic IP addressing are assigned a  
new IP address by a DHCP server. DHCP frees you from having to assign  
IP addresses manually every time a new user is added to your network.  
Repeat the above step to connect more PCs or network devices to the  
Router.  
2. B. If you are connecting the 1-Port Router to just one PC, plug one end  
of a network cable into the Router’s LAN port and the other end into the  
PC’s network adapter port. Set the Crossover Switch to crossover mode  
(X). If the crossover mode does not light up a Link LED, see page 10.  
DHCP servers can either be a designated PC on the network or another net-  
work device, such as the Cable/DSL Router.  
By factory default, DHCP is enabled on your Router. If you already  
have a DHCP server running on your network, you must disable one of the  
two DHCP servers. If you run more than one DHCP server on your network,  
you will experience network errors, such as conflicting IP addresses.  
If you are connecting the 1-Port Router to a hub or switch, plug one  
end of a network cable into the Router’s LAN port, and the other end into  
to a standard port on your network’s hub or switch. Set the LAN port’s  
Crossover Switch to its straight-through (II) mode.  
To disable DHCP on your Router, see page 44.  
If your hub or switch has no more standard ports available, connect the  
Router using its LAN port to the Uplink port on the hub or switch. Set  
the Crossover Switch to straight-through mode (II) for this set-up.  
Even if you assign a static IP address to a PC, that PC can  
still use DHCP’s dynamic IP addressing.  
If the dynamic IP addressing fails to provide a dynamic IP  
address for any reason, that PC automatically uses its default  
static IP address.  
2. C. If you have the 3-Port Cable/DSL Router, connect one end of a net-  
work cable from the one of the Router’s LAN ports (labeled 1, 2, or 3) to a  
port on a PC, hub, switch, or other network device.  
The 3-Port Router features one USB plug-and-play port that connects  
instantly to any USB-ready desktop or notebook PC. This allows you to  
connect to and access your Router without even configuring any network  
cards. Use the enclosed USB cable to connect your PC to the Router: the  
Type A end connects to your PC’s USB port, while Type B connects to the  
Router’s USB port.  
ing Your Hardware Toging Up  
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EtherFast Cable/DSL Routers  
3. Connect the network cable from your cable or DSL modem to the WAN  
port on your Router’s rear panel. This is the only port that will work for  
your modem connection.  
Uplinking: Connecting More Devices to Your Router  
If your Router’s LAN ports are all full and you still have PCs and/or  
devices to connect, add a hub or a switch to your Router.  
4. Connect the power adapter to the Power port on the rear panel of the  
Router, then plug the power adapter into a power outlet.  
To do so, use the Router’s Uplink port to connect to a standard port on a  
hub or switch. If you have a PC/device connected to the port right next to  
the Uplink port (on the 3- and 4-Port Routers), disconnect that PC/device  
and plug it into an open port on the new hub or switch.  
It is highly recommended that you plug your Router into a  
power strip with surge protection.  
Since the Uplink port shares internal wiring with the port right next to it,  
you can only use only one of these two ports at a time: these ports are  
called shared ports.  
• The Power LED on the front panel will light up green as soon as the  
power adapter is connected properly.  
If your new hub or switch also has an Uplink port, it too can be uplinked  
when you next run out of ports, and so on.  
• The Diag LED will light up red for a few seconds when the Router goes  
through its self-diagnostic test. This LED will turn off when the self-test  
is complete.  
Use the Router’s Uplink port to connect to a standard port on a hub or  
switch. This leaves you with new, open ports on the hub or switch, to  
which you can add more PCs and/or network devices.  
5. Power on the cable or DSL modem.  
See www.linksys.com for complete product lines of 10/100 Mbps hubs and  
switches.  
6. Press the Reset button on the Router’s front panel with a paper clip or a  
pencil. Hold the button in until the Diag LED lights up and then turns off.  
This will restore the Router’s factory default settings.  
Technical Checkpoint:  
Did you remember to check for Link LEDs for all your connections?  
If all of your Link LEDs are not lighting up, make sure that all your  
cables are securely plugged in, and that all of your hardware is pow-  
ered on properly.  
Your Router’s hardware installation is now complete!  
Continue with the next section to configure  
your Router and PCs.  
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3. Select “Search for the best driver for your device (Recommended).”  
Configuring Your Router’s USB Port  
Click Next.  
Now that all of your Router’s hardware is connected together, you must  
enable the PC that is connected to the Router through its USB port.  
Since your Router acts as a network adapter for your PC, there’s no need for  
you to install a USB adapter for that PC. Just follow the directions below to  
enable your PC’s USB connection to the Router:  
• If you are running Windows 98, continue on this page, below.  
• If you are running Windows 2000, go to page 26.  
• If you are running Windows Millennium, go to page 29.  
After you finish this configuration, make sure that TCP/IP is  
installed on your PC(s). For instructions on installing TCP/IP,  
see page 65.  
4. Select “Floppy disk drives” and click Next to start the search for your  
driver.  
You can also connect your Router’s USB port to other USB devices besides  
USB-ready PCs, such as USB hubs.  
USB Installation for Windows 98  
1. Start up your PC in Windows 98.  
2. Windows will display a message saying that it has detected new hardware.  
Click Next.  
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5. A new window will appear, saying that Windows is now ready to install  
7. Windows will notify you that it has completed copying the driver files to  
the best driver for this device. Click Next to continue.  
your PC. Click Finish.  
6. Windows will begin copying the files to your PC. Do not click Cancel or  
8. Windows will ask you if you want to restart your PC. Click Yes so your  
press the Esc key during this process.  
new installation will take effect.  
If Windows asks for your Windows operating system files before copying,  
direct your PC to the location of those files, e.g,  
If it does not ask you, go to Start, Shut Down, then select Restart and  
click Yes.  
c:\windows\options\cabs, or D:\Win98 (assuming that your  
CD-ROM drive is named D).  
Your USB installation is now complete.  
Go to page 33 to configure your network  
to work with the Router.  
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3. When Windows asks you where to search for driver files, select “Floppy  
USB Installation for Windows 2000  
Disk Drives” and click Next.  
1. Start up your PC in Windows 2000. Windows will show a message  
notifying you that the PC has found new hardware. Windows’ Hardware  
Wizard will show a message to say that it is ready to start installing the  
driver files to your PC. Click Next.  
4. Windows will show a message saying that it has found the driver files.  
Click Next.  
2. Select “Search for a suitable driver for my device (Recommended)” and  
click Next.  
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4. Windows will ask you if you want to continue with the installation.  
EtherFast Cable/DSL Routers  
6. Windows will display a message saying that it has finished installing the  
Click Yes.  
driver files on your PC. Click Finish.  
5. Windows will copy the driver files to your PC.  
7. Go to Start, Settings, Control Panel, and Network to display the screen  
If Windows asks for your Windows operating system files before copying,  
direct your PC to the location of those files, e.g,  
below. Make sure that TCP/IP is installed for this PC.  
c:\windows\options\cabs, or D:\Win98 (assuming that your  
CD-ROM drive is named D).  
Your USB installation is now complete.  
Go to page 33 to configure your network  
to work with the Router.  
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USB Installation for Windows Millennium  
EtherFast Cable/DSL Routers  
3. Windows will notify you that it is ready to install the driver file on to your  
PC. Select “Specify a location” and type in “a:\Win98” in the field.  
Click Next to continue.  
1. Start up your PC in Windows Millennium.  
2. Windows will notify you that new hardware has been detected (shown  
above). Select “Automatic search for a better drive (Recommended)” and  
click Next.  
4. Windows will complete its search for driver files. Click Next to begin  
installing the files.  
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5. Windows will display a message saying that it has finished installing the  
7. When your PC is finished restarting, click on Start, Settings, Control  
driver files on your PC. Click Finish.  
Panel, and Network. Make sure that TCP/IP is installed for your PC.  
6. Windows will ask you to restart your PC. Click Yes.  
Your USB installation is now complete.  
Go to page 33 to configure your network  
to work with the Router.  
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Configuring Your Network with the  
Cable/DSL Router  
EtherFast Cable/DSL Routers  
3. A username and password prompt will appear. Leave the User Name  
field empty and type admin, which is the default password, into the  
Password box. Click OK.  
Configuring the Cable/DSL Router  
Now that your Cable/DSL Router is connected to your network, you can  
begin configuring your Router.  
IMPORTANT! If you have previously enabled any Internet-sharing  
proxy server software on any of your PCs, you must disable it now.  
Some examples of proxy server software are Internet LanBridge,  
Wingate, and Sygate. To disable your proxy server software:  
4. The Cable/DSL Router’s Setup page will appear.  
• If you are running Netscape Navigator: Click Edit >> Preferences >>  
Advanced >> Proxies> and click Direct Connection to the Internet.  
• If you are running Internet Explorer, click Start>> Settings>> Control  
Panel>> Internet Options>> Connections>> LAN Settings. Remove  
the checks from all three boxes. Click OK to continue.  
Also, you must disable any Internet log-on software (such as Ivasion  
Winpoet or Enternet 300) and any firewall software (such as  
ZoneAlarm and Watchdog) on all of your PCs.  
1. Make sure that each of your PCs has the TCP/IP protocol configured.  
Otherwise, see page 64 now to do so, before configuring your Router.  
2. Open your web browser and type http://192.168.1.1in the  
browser’s Address field. This number is the default IP address of your  
Router. Press Enter.  
5. Configure the following values:  
Host Name & Domain Name These fields allow you to give a Host and  
Domain name for the Router. Some ISPs require these names as identifi-  
cation. You may have to check with your ISP to see if your broadband  
Internet service has been configured with Host and Domain names. In  
most cases, leaving these two fields blank will still work.  
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LAN IP Address These values refer to your internal network settings.  
Unless you have specific internal needs, there should be no reason to  
change these values. For the internal LAN side, the Router’s default val-  
ues are as follows:  
10. Reset the power on the cable or DSL modem, then restart the PC so  
the new Router settings will take effect.  
Your Cable/DSL Router is now configured on your network.  
Continue on to the next section to complete your network setup.  
• Private IP Address:  
192.168.1.1  
• Subnet Mask:  
255.255.255.0  
Configuring PCs to Connect to the Cable/DSL Router  
WAN IP Address These values refer to the external network (the Internet)  
you connect to every time you access your Internet connection.  
Now that your Router is configured, you will have to configure your other  
PCs to accept the IP addresses that your Router will provide.  
Most broadband ISPs assign their clients to a different IP address each  
time they log on. If this is the case with your ISP, select Obtain an IP  
Address Automatically and go to step 5.  
Note: Make sure that a network card or adapter has been successfully  
installed in each PC you plan on configuring before continuing.  
If your ISP assigns you a fixed, static IP address, select Specify an IP  
Address and enter the appropriate values into the IP Address, Subnet  
Mask, Default Gateway Address and DNS (Required) fields provided  
by your ISP.  
These instructions apply only to Windows 95 and Windows 98  
machines. For TCP/IP setup under Windows NT, see your  
Windows NT manual.  
1. Click the Start button, select Settings, then Control Panel.  
If you need to enable PPPoE support, choose Enable. If you do  
enable PPPoE, remember to remove any existing PPPoE applica-  
tions already on any of your PCs. More information on PPPoE  
can be found on page 41.  
2. Double-click on the Network icon.  
3. In the Configuration window, select the TCP/IP protocol line associated  
with your network card/adapter. If there is no TCP/IP protocol line listed  
for your card/adapter, go to page 64 to install the TCP/IP protocol now.  
6. When you have properly configured the Setup window, click Apply, then  
click Continue.  
7. Select the DHCP tab.  
8. DHCP is already enabled on your Router by factory default. By leaving  
the setting on Enable, the Router is configured to automatically assign IP  
addresses to each of your PCs.  
Optional: In the Number of DHCP Users field, enter the number of PCs  
you plan on networking to the Router. If you add more PCs to your net-  
work in the future, don’t forget to change this value.  
If you already have a DHCP server on your network, select Disable for  
the DHCP Server option. If you do so, you must assign your Router a new  
static IP address.  
9. Click Apply, then click Continue.  
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4. Click the Properties button, then choose the IP Address tab. Select  
EtherFast Cable/DSL Routers  
The Cable/DSL Router’s Web-based  
Obtain an IP address automatically. Click OK.  
You have now completed the PC’s client settings, so it can connect to the  
Router.  
Utility  
Quick & Easy Router Administration  
The EtherFast Cable/DSL Router uses a web browser-based administrative  
Utility that is programmed into a chipset. All administrative tasks for the  
Router are performed through this Setup Utility. The Utility can be accessed  
through any PC on the network by typing http://192.168.1.1into the  
web browser’s Address field (even if that PC does not yet have Internet  
access), shown below.  
After entering the address value into the web browser, a password request  
page will pop up, shown below.  
Leave the User Name field blank and type “admin” into the Password field.  
5. Click OK. Windows may ask for original Windows installation files. Direct  
your PC to the location of the files, e.g., D:\win98or D:\win95,  
c:\windows\options\cabs.  
6. Windows will ask you to restart the PC. Click Yes.  
7. Repeat steps 1-6 for each PC on your network.  
When all of your PCs are configured, the Cable/DSL Router  
Setup and Configuration is complete.  
In this section, you’ll find brief descriptions of each web page in the Utility  
and each page’s key functions. More detailed explanations and instructions  
can be found by clicking each page’s Help button in your Router’s Setup  
Utility.  
If you want to learn more about the Router’s Web-based  
Utility, proceed to the next section.  
To apply any settings you’ve changed on a page, click the Apply button, then  
click Continue. To clear any values you’ve entered on any page, click  
Cancel.  
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• WAN IP Address This is the IP address that your Router has, when seen  
from the external WAN, or the Internet.  
Setup  
• MAC Address Cloning Click on "MAC Address" (next to WAN IP  
Address) to display your Router's MAC address, which is a 12-digit code  
assigned to a unique piece of hardware for identification, like a social  
security number. Some ISPs require that you register the MAC address of  
your network card/adapter, which was connected to your cable or DSL  
modem during installation. If your ISPs require MAC address registra-  
tion, find your adapter's MAC address by doing the following:  
Note: The Setup  
page in this pic-  
ture may differ  
slightly from the  
one you see.  
• If you are running Windows 98:  
Go to Start, Run, type in "command," and press Enter. At the DOS  
prompt, type "winipcfg."  
• If you are running Windows 2000 or Millennium:  
Go to Start, Run, type in "command," and press Enter. At the DOS  
prompt, type "ipconfig/all." The"Physical Address" with 12 digits is your  
Router’s MAC address.  
Enter those 12 digits into the fields below, and click Apply. This “clones”  
your network adapter’s MAC address onto your Router, and prevents you  
from having to call your ISP to change the registered MAC address to the  
Router’s MAC address.  
The Basic Setup screen is the first screen you see when you access the Setup  
Utility. If you have already installed and set up your Router, you have already  
seen this screen and properly configured all of the screen’s values.  
Note: This is a  
sample screen.  
Please enter  
the MAC  
• Host Name This entry is required by some ISPs.  
• Domain Name This entry is required by some ISPs.  
Address for  
your Network  
Card/Adapter  
into this field.  
• Firmware Version This entry shows the version and date of the firmware  
you are using. Future versions of the Router’s firmware will be posted and  
available for download on the Linksys Web site.  
• LAN IP Address and Subnet Mask The IP Address and Subnet Mask of  
the Router as it is seen on the internal LAN. The default value is  
192.168.1.1 for the IP address and 255.255.255.0 for the Subnet Mask.  
• Subnet Mask This is the Router’s Subnet Mask, as seen by external users  
on the Internet (including your ISP). If you select “Obtain an IP address  
automatically,” your ISP will assign these values.  
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• Default Gateway Address Your ISP will provide you with the Default  
Gateway IP Address. If you select “Obtain an IP address automatically,”  
your ISP will assign these values.  
Password  
• DNS (Domain Name Server) IP Address Your ISP will provide you with  
at least one DNS Server IP Address. If you select “Obtain an IP address  
automatically,” these values will be assigned by your ISP.  
You can check whether the values you entered for the above  
settings are correct by testing your Internet access.  
• PPPoE (Point-to-Point Protocol over Ethernet) Some DSL-based ISPs  
use PPPoE to establish communications with an end-user. If you are using  
a DSL line, check with your ISP to see if they use PPPoE. If they do use  
PPPoE, you must enable it. To enable PPPoE:  
1. Click on the Enable option in the PPPoE section of the Setup screen.  
2. Enter the User Name you use to log on to your Internet connection.  
3. Enter your corresponding Password.  
It is strongly recommended that you set a password for the Router. When you  
first power up the Router, there is no default Password setting assigned.  
• Connect on Demand If you aren’t actively using the Internet, you can  
configure your Router to cut your connection with your ISP after a certain  
period of time. If you have been disconnected due to inactivity, Connect  
on Demand enables your Router to automatically re-establish your con-  
nection as soon as you attempt to access the Internet again. If you wish to  
activate Connect on Demand, choose the Enable option.  
If you leave the password field blank, all users on your network will be able  
to access the Router simply by entering the unit's IP address into their web  
browser's location window.  
If you select the Restore Factory Default option and click  
Apply, you will clear all of the Router’s settings.  
• Max Idle Time Max Idle Time is the number of minutes that passes  
before the Router drops your Internet connection, due to inactivity. If you  
want your Internet connection to remain on at all times, enter zero (0) in  
this field and click Apply. Otherwise, enter in the number of minutes you  
want to elapse before your Internet access disconnects.  
Do not restore the factory defaults unless you are having  
difficulties with the Router and have exhausted all other  
troubleshooting measures. Once the Router is reset, you  
will have to re-enter all of your configuration data.  
• Keep Alive Option This option keeps your PPPoE-enabled Internet access  
connected indefinitely, even when it sits idle. It keeps the connection  
alive by sending out a few data packets periodically, so your Internet serv-  
ice thinks that the connection is still active. To use this option, click on  
the box next to Keep Alive to select it, and click Apply.  
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Status  
DHCP Server This field shows the status of the Router's DHCP server  
function, which is either enabled or disabled.  
• WAN These fields display the WAN IP Address, WAN Subnet Mask and  
WAN Default Gateway IP address of the Router, as seen by external users  
on the Internet.  
DNS (Domain Name System) IP Address These fields show the IP  
Address(es) of the DNS currently used by the Router. Multiple DNS IP  
settings are common. In most cases, the first available DNS entry is used.  
DHCP  
This tab displays the current status of the Router; it reflects the data and  
selections you’ve entered under the Setup tab.  
A DHCP (Dynamic Host Configuration Protocol) server automatically  
assigns IP addresses to each PC on your network for you. Unless you already  
have one, it is highly recommended that you leave your Router enabled as a  
DHCP server.  
All of the information provided on this screen is read-only. To make changes,  
select the Setup tab.  
• Host Name This field shows the name of your Router. This entry is nec-  
essary for some ISPs.  
• DHCP Server DHCP is already enabled by factory default. If you  
already have a DHCP server on your network, set the Router's DHCP  
option to Disable and click Apply. If you disable DHCP, remember to  
assign a static IP address to your Router.  
• Firmware Version This field shows the installed version and date of the  
firmware. Version dates are slightly more accurate than version numbers.  
• PPPoE (Point-to-Point Protocol over Ethernet) This field shows  
whether you have enabled the use of the Router’s PPPoE support.  
• Starting IP Address Enter a value for the DHCP server to start with  
when issuing IP addresses. This value must be (192.168.1.) 2 or greater,  
because the default IP address for your Router is 192.168.1.1.  
• LAN These fields display the current IP Address and Subnet Mask of the  
Router, as seen by users on your internal network.  
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• Number of DHCP Users (Optional) Enter the maximum number of PCs  
that you want the DHCP server to assign IP addresses to. This number  
cannot be greater than 253.  
To upgrade the Router’s firmware:  
1. Select the Help tab (shown on the previous page).  
• DHCP Clients Table Click on the Clients Table button to show the cur-  
rent DHCP Client data. (This data is stored in temporary memory and  
changes periodically).  
2. Click on Upgrade Firmware to display a new window (shown below):  
Help  
3. Enter your Router’s administration password into the Password Confirm  
field.  
4. Click the Browse button to find the firmware upgrade file that you down-  
loaded from the Linksys Web site.  
5. Double-click the Upgrade file. Click on the Upgrade button and follow  
the instructions there.  
Under the Help tab, you’ll find links to all of the Utility’s internal support  
documentation, including the application that upgrades the Router’s firmware.  
New firmware versions are posted on www.linksys.com, and can be down-  
loaded for free. If your Router can access the Internet already, there’s no  
need to download a newer firmware version, unless that version has a new  
feature that you want to use. “Flashing,” or loading new firmware onto your  
Router does not enhance the speed or the quality of your connection speed.  
See page 48 for directions on enabling remote firmware upgrades (IP  
Filtering).  
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IP Filtering  
Blocking WAN Requests  
• By enabling the Block WAN Request feature, you can prevent your network  
from being “pinged,” or detected, by other Internet users. The Block WAN  
Request feature also reinforces your network security by hiding your net-  
work ports. Both functions of the Block WAN Request feature make it more  
difficult for outside users to work their way into your network.  
• Click the Apply button to save your changes.  
Using IPSec Pass Through  
• This feature lets you use IPSec Pass Through. To use this feature, click on  
Enable next to “IPSec Pass Through,” then click on Apply.  
• To disable IPSec Pass Through, click on Disable and then click on Apply.  
Using PPTP Pass Through  
• Point-to-Point Tunneling Protocol is the method used to enable VPN  
(Virtual Private Networking) sessions. To enable this feature, click on  
Enable next to PPTP Pass Through, and then click Apply.  
IP Filters block specific internal users from accessing the Internet and enable  
VPN (Virtual Private Network) sessions. You can set up filters by using IP  
addresses or network port numbers (or a range of ports).  
• To disable this feature, click on Disable next to PPTP Pass Through, and  
then click Apply.  
Note: Only one VPN session may be conducted at a time.  
Remote Management  
and Remote Upgrades  
Using Remote Management  
Setting Up Filters  
must be activated  
before you leave to a  
remote location.  
• This feature allows you to manage your Router  
from a remote location, via the Internet. To enable  
this feature, click on Enable, then click on Apply.  
• To set up a filter using IP addresses, enter the range of IP addresses you  
wish to filter into the IP address fields. Users who have filtered IP address-  
es will not be able to access the Internet at all. If you only want to filter  
one IP address instead of a range of IP addresses, enter the same value into  
both fields. For instance, if you wish to filter the PC with the IP address of  
192.168.1.5, enter 5 into both fields on one line: 192.168.1.5~ 192.168.1.5.  
Click Apply when you’re done.  
• To disable Remote Management, click on Disable, then click on Apply.  
Using Remote Upgrade  
• This feature allows you to “flash,” or upgrade, your Router’s firmware from  
a remote location. To enable Remote Upgrade, click on Enable, then click  
on Apply.  
• To filter users by network port number, enter a network port number or a  
range of network ports. Enter the port numbers you want to filter into the  
port numbers fields. Users connected to the Router will no longer be able  
to access any port number listed there.  
• To disable this feature, click on Disable, then click on Apply.  
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IP Forwarding  
Dynamic Routing  
With Dynamic Routing, you can automatically adjust to physical changes in  
the network's layout. The Router, using the RIP protocol, calculates the most  
efficient route for the network’s data packets to travel between the source and  
the destination, based upon the shortest paths. The RIP protocol regularly  
broadcasts routing information to other routers on the network.  
Forwarding sets up public services on your network, such as web servers, ftp  
servers, or email servers.  
When users send this type of request to your network via the Internet, the  
Router will forward those requests to the appropriate PC. Before using  
Forwarding, the Router's DHCP function must be disabled under the DHCP  
tab and the Router must be assigned a new static LAN IP address.  
To set up dynamic routing:  
1. Select the correct working mode. Gateway Mode should be used if your  
Router is hosting your network's connection to the Internet. Router Mode  
should be selected if the Router exists on a network with other routers.  
If you need to forward all ports for one PC, use DMZ Hosting.  
To add a server using Forwarding:  
2. Select the protocol by which you transmit data on the network.  
3. Select the protocol by which the Router receives network data.  
4. Click the Apply button to save your changes.  
1. Enter the port number or range of ports used by the server. On the same  
line, enter the LAN IP address of the server that you want the Internet  
user(s) to access.  
2. Configure as many entries as needed- the Router supports up to 10 ranges  
of ports. Click Apply when you’re done.  
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2. Enter the following data to create a static route:  
Static Routing  
Destination LAN IP The Destination LAN IP address is the Address of  
the remote network or host to which you want to assign a static route.  
Enter the IP address of the host for which you wish to create a static route  
here. If you are establishing a route to an entire network, be sure that the  
network portion of the IP address is set to zero (0).  
For example, the Router’s standard IP address is 192.168.1.1. Based on  
this address, the address of the network to which the Router is connected  
is 192.168.1, with the last digit (1, in this case) determining the Router’s  
place on the network. Therefore, you would enter the IP address  
192.168.1.0 if you wanted to route to the Router’s entire network, rather  
than to just the Router.  
Subnet Mask The Subnet Mask (also called the Network Mask) deter-  
mines which portion of an IP address is the network portion and which  
portion is the host portion. In the example above, the Network Mask is  
255.255.255.0. This determines (by using the values 255) that the first  
three numbers of an network IP address identify this particular network,  
while the last digit (from 1 to 254) would identify the specific host.  
Default Gateway This IP address must be the IP address of the gateway  
device that allows for contact between the Router and the remote network  
or host.  
If your Cable/DSL Router is connected to more than one network, you may  
have to set up a static route between the two networks. A static route is a pre-  
determined pathway that network data packets must travel to reach a specific  
host or network. Click the Show Routing Table button to view the current  
static routing configuration.  
Hop Count This value gives the number of nodes that a data packet pass-  
es through before reaching its destination. A node is any device  
on the network, such as switches, PCs, etc.  
Interface Interface tells you whether your network is on the internal  
LAN or the WAN, or the external Internet. If you’re connecting to a sub-  
network, select LAN. If you’re connecting to another network through  
the Internet, select WAN.  
To create a static route entry:  
1. Select Static Route Entry from the drop-down list. The Cable/DSL  
Router supports up to 20 static route entries.  
3. Click Apply to save your changes.  
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DMZ Hosting  
Logging  
The Log feature provides you with a log of all incoming and outgoing URLs  
or IP addresses for your Internet connection.  
Outgoing Access Log lists all the URLS or IP addresses of Internet sites that  
users on your network have accessed, and Incoming Access Log gives you a  
log of all incoming Internet traffic.  
The DMZ Hosting feature allows one local user to be exposed to the Internet  
to use a special-purpose service such as Internet gaming and video-confer-  
encing.  
This data can also be accessed by other network users if the file is shared out.  
• To activate logging, click on Enable next to “Access Log.”  
Whereas IP Forwarding can only forward a maximum of 10 ranges of ports,  
DMZ hosting forwards all the ports for one PC simultaneously.  
• Enter in the IP address of the PC that you want to send the log to. Make  
sure that this PC is using a static IP address. Click Apply when you’re  
done.  
• To expose one PC, enter the computer’s IP address and click Apply.  
• Deactivate DMZ by entering a zero (0) in the field and clicking Apply.  
• Click on Outgoing Access Log or Incoming Access Log to view each log.  
• To disable Logging, click on Disable in the Log window, then click Apply.  
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should be the Router’s IP Address, and DNS (in "More".)  
• Same as above, check the same setup values in the Status Monitor page  
of the Cable/DSL Router.  
Troubleshooting  
Common Problems and Solutions  
4. When I enter a URL or IP address, I get a “Request timed out” error.  
• Check to see if other PCs give you the same error message. If they do,  
make sure that your workstations’ IP settings are correct: IP address,  
Subnet Mask, Default Gateway and DNS Server data.  
This section provides possible solutions to problems regarding the installation  
and operation of the Cable/DSL Router. Read below description to solve your  
problems. If you can’t find an answer here, check the Linksys website at  
www.linksys.com.  
• If the PCs are configured correctly but still not working, check the  
Cable/DSL Router. Make sure that it is connected and powered on.  
Connect to the Router and check its settings. If you cannot connect to  
it, check the LAN and power connections.  
• If the Cable/DSL Router is configured correctly, check your Internet  
connection. (DSL/cable modem, etc.) to see that it is working correctly.  
1. I can’t connect to the Cable/DSL Router.  
• Check to see that the Cable/DSL Router is properly installed, the LAN  
connections are OK (Link LEDs should be on), and it is powered ON.  
• Make sure that your PC and the Router are on the same network seg-  
ment. If you are not sure, initiate the DHCP function and let the PC get  
the IP address automatically.  
• Make sure that your PC is using an IP address between 192.168.1.2 to  
192.168.1.254 and thus compatible with the Cable/DSL Router default  
IP address of 192.168.1.1.  
• Also, the Subnet Mask must be set to 255.255.255.0 to match the  
Cable/DSL Router’s Subnet Mask. You can check these settings for the  
Router by going to Start, Settings, Control Panel, and Network:  
check the Properties for the TCP/IP protocol.  
5. I can’t obtain an IP address from my cable or DSL modem.  
• Make sure that all of your cabling is properly connected and that all of  
the Router’s WAN and LAN LEDs are lighting up.  
• Power down your cable or DSL modem for a few seconds. Turn it back  
on. After the modem goes through its self-test, check to see if you now  
have an IP address.  
• Make sure that your cable or DSL modem is DHCP-capable.  
• You may have to enter the Host or Domain name in the Setup page of  
the Router’s web-based utility. Go to page 33 for more information.  
• Your ISP may require MAC Addresses. Check with your ISP. This  
address can be obtained in the Status screen of the Router’s Web-based  
Utility.  
2. The Diag LED stays lit when it should not be lit.  
• The Diag LED lights up when the Router is first powered up.  
Meantime, the system will boot up itself and check for proper opera-  
tion. After finishing the checking procedure, the LED turns off to show  
the system is working fine. If the LED remains lit after this time, the  
device is not working properly. Try to re-flash the firmware by assign-  
ing a static IP address to the computer, then upgrade the firmware  
again. If that doesn’t help, contact your dealer for further inspection.  
6. I can’t access my email or the Internet.  
• Some ISPs,especially cable providers, configure their networks so that  
you don’t have to enter a full Internet address into your web browser or  
e-mail application to reach your home page or receive your e-mail.  
• If your Internet home page address is something very simple, such as  
“www”, instead of “www.linksys.com”, or your e-mail server’s address  
is something like “e-mail” or “pop3”, instead of “pop.mail.linksys.com,”  
you won’t be able to properly configure your Cable/DSL Router until  
you determine the actual Internet addresses of your Web and e-mail  
connections.  
• You must obtain this information before connecting the Router to your  
network. To do so, you can ask your ISP, or turn to page 61 to learn  
how to find this data yourself by “pinging” your Router for an IP  
address.  
3. I can’t browse through the Cable/DSL Router.  
• Check if both ends of the network cable and power adapter are properly  
connected. Check if the status LEDs on the front panel are functioning  
properly.  
• If using Windows 95 or Windows 98, check the TCP/IP setup on the  
client side. Run "winipcfg" by clicking on the Start button, then select-  
ing Run. The PC should have an IP address of 192.168.1.xxx ("xxx" is  
from 2 to 254.) Subnet Mask is 255.255.255.0, the default gateway IP  
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Frequently Asked Questions  
Does the Cable/DSL Router support ICQ send files? Yes, with the following fix:  
ICQ menu-> preference -> connections tab-> check "I am behind a firewall  
or proxy," and 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.  
How many IP addresses can the Cable/DSL Router support? The Router sup-  
ports a maximum of 253 IP addresses.  
How do I get Napster to work with the Router? Napster is fully compatible  
Is IPSec Pass-Thru supported by the EtherFast Cable/DSL Router? Yes, it is a  
with the Router and requires no special settings.  
built-in feature that the Router automatically enables.  
I set up an Unreal Tournament server, but others on the network cannot join.  
What do I do? If you are running a dedicated Unreal Tournament server, you  
must create a static IP address for each of the network’s PCs and forward  
ports 7777, 7778, 7779, 7780, 7781, and 27900 to the IP address of the  
server. If you want to use the UT Server Admin, forward another port (8080  
usually works well), 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.  
Where is the Cable/DSL Router installed on the network? In a typical environ-  
ment, the Router is installed between the Cable/DSL Modem and the LAN.  
Plug the Cable/DSL Router into the cable or DSL modem's Ethernet port.  
Does the Cable/DSL 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 from LAN to  
LAN connections, but those protocols cannot connect from WAN to LAN.  
Can multiple gamers on the LAN log on to one game server and play simultane-  
ously with just one public IP address? It depends on which network game  
you’re playing, and/or what kind of game server you are using. For exam-  
ple, Unreal Tournament does support multi-login with just one public IP  
address.  
Does the WAN connection of the Cable/DSL Router support 100Mbps Ethernet?  
Since broadband Internet connections like cable and DSL do not exceed  
10Mbps, the Cable/DSL Router’s current hardware design only supports  
10Mbps Ethernet on its WAN port. It does support 100Mbps through the  
built-in auto-sensing Fast Ethernet 10/100 Switch on the LAN side of the  
How do I get Half-Life: Team Fortress to Work with the Router? The default  
client port for Half-Life is 27005. The PCs on your LAN must have  
"+clientport 2700x" to the HL shortcut command line; the x would be 6, 7,  
8, and on up. This lets multiple PCs connect to the same server.  
Router. (for the 3 and 4-Port Routers only)  
What is Network Address Translation (NAT) 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 network security since the addresses of PCs connected to the private  
LAN is never transmitted over the Internet. Furthermore, NAT allows the  
Cable/DSL Router to be used with low-cost Internet accounts, such as DSL  
or cable modems, where only one TCP/IP address is provided by the ISP.  
The user may have 253 private addresses behind this single address provid-  
ed by the ISP.  
One exception: Version 1.0.1.6 won't let multiple PCs with the same CD  
key connect at the same time, even if they’re on the same LAN (not a prob-  
lem with Version 1.0.1.3). For hosting games, the HL server does not need  
to be in the DMZ. Just forward port 27015 to the local IP of the server PC.  
There remains, however, a problem with people being booted after a few  
minutes with an "illegible server” message.  
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.  
Does the Cable/DSL Router support any operating system other than Windows  
95, Windows 98, Windows 2000, or Windows NT? Yes, but Linksys does not  
provide technical support for setup, configuration or troubleshooting of any  
non-Windows operating systems at this time.  
My Web pages hang (distorted), I get corrupted downloads, or nothing but junk  
characters are being displayed on the screen. What do I do? Force your NIC  
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to 10Mbps or half duplex mode, and turn off the "Autonegotiate" feature on  
it temporarily. (To do this, go to the Network Control Panel, in your  
Ethernet Adapter's Advanced Properties tab). Check our web site at  
www.linksys.com for more information.  
with a static IP address if you want to use DMZ Hosting.  
If DMZ Hosting is used, does the exposed user/PC share the public IP address  
with the Router? No.  
Does the Router pass PPTP packets or actively route PPTP sessions? The  
If all else fails in the installation, what can I do? Reset the Router by holding  
down the Reset button for at least three seconds and reset your cable or  
DSL modem by powering the unit off and then on. Obtain and flash  
(upload) the latest firmware release available on the Linksys website,  
www.linksys.com.  
Router allows PPTP packets to pass through.  
What is the maximum number of users supported by the Router? The Router  
supports up to 253 users.  
Is the Router cross-platform compatible? Any platform that supports Ethernet  
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 downloaded for free. The Router's firmware can be upgraded with  
TFTP programs. If your Router’s Internet connection is working well, there  
is no need to download a newer firmware version, unless that version con-  
tains 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.  
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.  
Does the Router replace a modem? Is there a cable or DSL modem in the  
Router? No, this version of the Router must work in conjunction with a  
cable or DSL modem.  
Does the Cable/DSL Router support IPsec? A new IPsec Pass Through features  
is now available in firmware versions 1.30 and later, which can be down-  
loaded at www.linksys.com.  
Which modems are compatible with the Router? This Router is compatible  
with virtually any cable or DSL modem that supports Ethernet.  
Does the Router function in a Macintosh environment? Yes, but the Router's  
setup pages are accessible only through Internet Explorer v4.0 or Netscape  
Navigator v4.0 or higher for Macintosh PCs.  
What are the advanced features of the Router? The Router's advanced features  
include IP Filtering, IP Forwarding, Dynamic Routing, Static Routing, DMZ  
hosting, and Logging.  
What type of firewall does the Router have? The Cable/DSL Router uses NAT  
What is the maximum number of VPN sessions allowed by the Router?  
(Network Address Translation) and TCP/IP port inspections.  
One VPN session at a time.  
Does the Router do stateful packet inspection? No.  
How big is the memory buffer on the Router? 512KB.  
I cannot get the web configuration screen for the Router. What can I do? Yo u  
may have forgotten to remove the proxy server settings on your Internet  
browser, e.g., Netscape Navigator or Internet Explorer. Or, remove the dial-  
up settings on your browser. Check your browser documentation.  
Does Linksys provided syslog support? No, Linksys does not currently provide  
syslog support.  
How can I check whether I have static or DHCP IP Addresses? Consult your ISP  
to obtain this information.  
What is DMZ Hosting? Demilitarized Zone (DMZ) allows one IP address (or  
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  
How do I get mIRC to work with the Router? Under the Fowarding tab, set port  
forwarding to 113 for the PC on which you are using mIRC.  
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Step One: To Ping an IP Address  
Appendix  
How to Ping Your ISP’s E-mail & Web Addresses  
The first step to determining your ISP’s web and e-mail server address is to  
ping its IP Address.  
1. Power on the PC and the cable or DSL modem, and restore the net-  
Almost all Internet addresses are configured with words and characters, i.e.,  
www.linksys.com, www.yahoo.com, etc. However, these Internet addresses are  
actually assigned to IP addresses, numerical values which are the true  
addresses on the Internet.  
work configuration set by your ISP if you have since changed it.  
2. Click Start, then Run, and type "command" to bring up the DOS win-  
dow.  
For example, www.linksys.com is actually 206.135.116.3. Type it into your  
web browser and you will bring up the Linksys home page every time.  
3. At the DOS command prompt, type "ping mail" (assuming that the  
location for which you’re trying to find an IP address is configured as  
“mail”). Press Enter. Information such as the following data, taken from  
a ping of Microsoft Network’s email server, will be displayed.  
However, IP and web addresses are sometimes long and hard to remember.  
Because of this, certain ISPs will shorten their server addresses to single  
words or codes on their customers’ web browser or e-mail configurations.  
C:\>ping mail  
If your ISP’s e-mail and Web server addresses are configured with single  
words (“www”, “e-mail”, “home”, “pop3”, etc.) instead of complete Internet  
addresses or IP addresses, your Router may have problems sending or receiv-  
ing email and accessing the Internet. This happens because your Router has  
not been configured by your ISP to accept their abbreviated server addresses.  
Pinging mail [24.53.32.4] with 32 bytes of data:  
Reply from 24.53.32.4: bytes=32 time<10ms TTL=128  
Reply from 24.53.32.4: bytes=32 time<10ms TTL=128  
Reply from 24.53.32.4: bytes=32 time<10ms TTL=128  
Reply from 24.53.32.4: bytes=32 time<10ms TTL=128  
The solution is to find the true web addresses behind your ISP’s code words.  
You can find these IP and web addresses of your ISP’s servers by “pinging”  
them.  
Ping statistics for 24.53.32.4:  
Packets: Sent = 4, Received = 4, Lost = 0 (0%  
loss),  
Approximate round trip times in milli-seconds:  
Minimum = 0ms, Maximum = 0ms, Average = 0ms  
If you do not have your ISP’s web and e-mail IP addresses,  
you must either get them from your ISP or follow these steps  
prior to connecting your Cable/DSL Router to your network.  
4. Write down the IP address returned by the ping command. (In the  
example above: 24.53.32.4.) This IP address is the actual IP address of  
the server “mail”, or any other word or value you have pinged.  
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Installing the TCP/IP Protocol  
Step Two: Pinging for a Web Address  
Follow these instructions to install the TCP/IP protocol on one of your PCs  
only after a network card has been successfully installed inside the PC. These  
instructions are for Windows 95 and Windows 98. For TCP/IP setup under  
Windows NT, see your Windows NT manual.  
While the IP address returned above would work as your e-mail server  
address, it may not be permanent. IP addresses change all the time. Web  
addresses, however, usually don’t. Because of this, you’re likely to have less  
problems by configuring your system with web addresses rather than IP  
addresses. Follow the instructions below to find the web address assigned to  
the IP address you just pinged.  
1. Click the Start button. Choose Settings, then Control Panel.  
2. Double-click on the Network icon to bring up your Network window.  
Select the Configuration tab.  
1. At the DOS command prompt, type “ping -a 24.53.32.4”, where  
24.53.32.4 is the IP address you just pinged. Information such as the fol-  
lowing data will be displayed.  
C:\>ping -a 24.53.32.4  
Pinging mail.msnv3.occa.home.com [24.53.32.4] with  
32 bytes of data:  
Reply from 24.53.32.4: bytes=32 time<10ms TTL=127  
Reply from 24.53.32.4: bytes=32 time<10ms TTL=127  
Reply from 24.53.32.4: bytes=32 time<10ms TTL=127  
Reply from 24.53.32.4: bytes=32 time<10ms TTL=127  
Ping statistics for 24.53.32.4:  
Packets: Sent = 4, Received = 4, Lost = 0 (0%  
loss),  
Approximate round trip times in milli-seconds:  
Minimum = 0ms, Maximum = 0ms, Average = 0ms  
3. Click the Add button.  
4. Double-click on Protocol.  
2. Write down the web address returned by the ping command. (In the  
example above: mail.msnv3.occa.home.com.) This web address is the web  
address assigned to the IP address you just pinged. While the IP address  
of “mail” could change, it is likely that this web address will not.  
5. Highlight Microsoft under the list of manufacturers.  
3. Replace your ISP’s abbreviated server address with this extended web  
address in the corresponding Internet application (web browser, e-mail  
application, etc.).  
Once you have replaced the brief server address with the true server address,  
your Router should have no problem accessing the Internet through that  
Internet application.  
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6. Find and double-click TCP/IP in the list to the right (below).  
EtherFast Cable/DSL Routers  
Twisted-Pair Cabling  
There are different grades, or “categories,” of twisted-pair cabling. Category  
5 is the most reliable and most highly recommended. Category 3 is a good  
second choice. Straight-through cables are used for connecting computers to a  
hub. Crossover cables are used for connecting a hub to another hub (there is  
an exception: some hubs have a built-in uplink port that is crossed internally,  
which allows you to link or connect hubs together with a straight-through  
cable instead).  
You can buy pre-made Category 5  
cables, or cut and crimp your own.  
Category 5 cables can be purchased or  
crimped as either straight-through or  
crossover. Inside a Category 5 cable  
are 8 thin, color-coded wires inside  
that run from one end of the cable to  
the other. All 8 wires are used. In a  
straight-through cable, wires 1, 2, 3,  
and 6 at one end of the cable are also  
wires 1, 2, 3, and 6 at the other end. In  
a crossover cable, the order of the  
wires change from one end to the  
other: wire 1 becomes 3, and 2  
becomes 6. See the diagrams on the  
next page for more  
7. After a few seconds, the main Network window will appear. The TCP/IP  
Protocol should now be listed.  
detailed information on  
straight-through and  
crossover cabling.  
To determine which wire is wire number 1, hold the cable  
so that the end of the plastic RJ-45 tip (the part that goes  
into a wall jack first) is facing away from you. Face the  
clip down so that the copper side faces up (the springy clip  
will now be parallel to the floor). When looking down on  
the copper side, wire 1 will be on the far left.  
8. Click OK. Windows may ask for original Windows installation files.  
Supply them as needed, e.g., D:\win98, D:\win95, c:\windows\options\cabs.  
9. Windows will ask you to restart the PC. Click Yes.  
The TCP/IP Installation is now complete.  
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4-Port Router Specifications  
Crimping Your Own Network Cables  
Model Number  
Standards  
Protocol  
BEFSR41  
IEEE 802.3 (10BaseT), IEEE 802.3u (100BaseTX)  
CSMA/CD  
• Straight-Through Cabling  
Ports  
(LAN) Four 10/100 RJ-45 switched ports  
(WAN) One 10Base-T Ethernet RJ-45 port  
for the cable or DSL modem  
(LAN) 10/100Mbps, (WAN) 10Mbps,  
(10BaseT) UTP Category 3 or better  
(100BaseTX) UTP Category 5 or better  
Star  
Speed  
Cabling Type  
Topology  
LED Indicators  
Power,  
(LAN) Link/Act, Full/Coll, 100  
(WAN) Link, Act, Diag  
Environmental Specifications  
Dimensions  
186mm x 154mm x 48mm (7.31” x 6.16” x 1.88”)  
Unit Weight  
13.4 oz. (0.42 Kg)  
Power Input  
External, 9V AC, 1 Amp  
Certifications  
FCC Class B, CE Mark Commercial  
0°C to 40°C (32°F to 104°F)  
-20°C to 70°C (-4°F to 158°F)  
10% to 85%, Non-condensing  
5% to 90%, Non-condensing  
Operating Temperature  
Storage Temperature  
Operating Humidity  
Storage Humidity  
• Cross-Over Cabling  
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1-Port Router Specifications  
3-Port Router Specifications  
Model Number  
Standards  
Protocol  
BEFSR11  
Model Number  
Standards  
BEFSRU31  
IEEE 802.3 (10BaseT), IEEE 802.3u  
(100BaseTX)  
IEEE 802.3 (10BaseT), IEEE 802.3u (100BaseTX)  
CSMA/CD  
Ports  
(LAN) One 10BaseT/100BaseTX RJ-45 port  
(WAN) One10BaseT Broadband Uplink port  
(WAN) 10Mbps (10BaseT Ethernet)  
(LAN) 10Mbps (10BaseT Ethernet) or  
100Mbps (100BaseTX Fast Ethernet)  
(10BaseT) UTP Category 3 or better  
(100BaseTX) UTP Category 5 or better  
Star  
Protocol  
Ports  
CSMA/CD  
(LAN) Three 10/100 RJ-45 Switched ports  
(WAN) One 10Base-T Ethernet RJ-45 port  
for the cable or DSL modem  
(LAN)10/100Mbps  
Speed  
Speed  
Cabling Type  
(WAN) 10Mbps  
Cabling Type  
(10BaseT) UTP Category 3 or better  
(100BaseTX) UTP Category 5 or better  
Star  
Topology  
LED Indicators  
Power,  
Topology  
(LAN) Link/Act, Full/Coll, 100  
(WAN) Link, Act, Diag  
LED Indicators  
Power  
(LAN) Link/Act, Full/Coll, 100  
(WAN) Link, Act, Diag  
(USB) USB  
Environmental Specifications  
Environmental Specifications  
Dimensions  
186mm x 154mm x 48mm (7.31” x 6.16” x 1.88”)  
Dimensions  
186mm x 154mm x 48mm (7.31” x 6.16” x 1.88”)  
Unit Weight  
13.4 oz. (0.42 Kg)  
Unit Weight  
12.6 oz. (0.35kg)  
Power Input  
Certifications  
Operating Temperature  
Storage Temperature  
Operating Humidity  
Storage Humidity  
External, 9V AC, 1 Amp  
Power Input  
Certifications  
Operating Temperature  
Storage Temperature  
Operating Humidity  
Storage Humidity  
External, 7.5V DC, 7Amps  
FCC Class B, CE Mark Commercial  
0°C to 40°C (32°F to 104°F)  
-20°C to 70°C (-4°F to 158°F)  
10% to 85%, Non-condensing  
5% to 90%, Non-condensing  
FCC Class B, CE Mark Commercial  
0°C to 40°C (32°F to 104°F)  
-20°C to 70°C (-4°F to 158°F)  
10% to 85%, Non-condensing  
5% to 90%, Non-condensing  
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Instant Broadband Series  
EtherFast Cable/DSL Routers  
Customer Support  
For help with the installation or operation of your Instant Broadband  
EtherFast Cable/DSL Router, contact Linksys Customer Support at one of the  
phone numbers or Internet addresses below.  
Information  
Customer Support  
800-546-5797 (1-800-LINKSYS)  
800-326-7114  
949-261-1288  
Fax  
949-261-8868  
Email  
Web site  
FTP site  
support@linksys.com  
http://www.linksys.com  
fttp://ftp.linksys.com  
www.linksys.com  
© Copyright 2000 Linksys, All Rights Reserved.  
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