Multitech Network Card MTPSR1 120 User Manual

Dual Ethernet ProxyServer  
Model MTPSR1-120  
User Guide  
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Contents  
Chapter 1 - Introduction and Description  
Introduction ................................................................................................................................................ 6  
Preview of this Guide ................................................................................................................................. 6  
Front Panel Description.............................................................................................................................. 8  
Back Panel Description .............................................................................................................................. 9  
RS232/V.35 Connector ........................................................................................................................ 9  
Ethernet 1 and 2 10Base-T Connectors .............................................................................................. 9  
Command Connector ........................................................................................................................... 9  
Power Connector ................................................................................................................................. 9  
Specifications ........................................................................................................................................... 10  
Ethernet Ports .................................................................................................................................... 10  
Command Port................................................................................................................................... 10  
WAN Link ........................................................................................................................................... 10  
Electrical/Physical .............................................................................................................................. 10  
Chapter 2 - Installation  
Safety Warnings ....................................................................................................................................... 12  
Unpacking Your ProxyServer ................................................................................................................... 12  
V.35 Shunt Procedure .............................................................................................................................. 13  
Cabling Your ProxyServer ........................................................................................................................ 14  
Chapter 3 - Software Loading and Configuration  
Loading Your Software ............................................................................................................................. 18  
IP Port Configuration.......................................................................................................................... 20  
Default WAN Link Configuration ........................................................................................................ 21  
Chapter 4 - Firewall Software  
Introduction .............................................................................................................................................. 24  
Typical Applications .................................................................................................................................. 24  
Configuration 1 - Cable/DSL Modem ................................................................................................. 24  
Configuration 2 - Existing Dual-LAN with Router ............................................................................... 26  
Configuration 3 - New Dual-LAN with T1 DSU................................................................................... 27  
Firewall Program Group ........................................................................................................................... 29  
Firewall Configuration............................................................................................................................... 31  
Changing IP Parameters .......................................................................................................................... 32  
Changing WAN Port Parameters ............................................................................................................. 34  
Adding Proxy Applications........................................................................................................................ 35  
Enabling the DHCP Server....................................................................................................................... 36  
Enabling PPP/SLIP .................................................................................................................................. 37  
Applications .............................................................................................................................................. 39  
Statistics ................................................................................................................................................... 39  
Filtering .................................................................................................................................................... 40  
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Chapter 5 - Remote Configuration and Management  
Introduction .............................................................................................................................................. 42  
Modem-Based Remote Configuration Procedure..................................................................................... 42  
LAN-Based Remote Configuration Procedure ......................................................................................... 44  
Windows Sockets Compliant TCP/IP Stack ....................................................................................... 44  
Remote Management ............................................................................................................................... 46  
Telnet ................................................................................................................................................. 46  
WEB Management............................................................................................................................. 48  
Chapter 6 - Warranty, Service and Tech Support  
Introduction .............................................................................................................................................. 50  
Limited Warranty ...................................................................................................................................... 50  
On-line Warranty Registration............................................................................................................ 50  
Tech Support ............................................................................................................................................ 51  
Recording ProxyServer Information................................................................................................... 51  
Service ..................................................................................................................................................... 52  
The Multi-Tech BBS ................................................................................................................................. 53  
To Log on to the Multi-Tech BBS........................................................................................................ 53  
To Download a File ............................................................................................................................ 53  
About CompuServe .................................................................................................................................. 54  
About the Internet..................................................................................................................................... 54  
About the Multi-Tech Fax-Back Service ................................................................................................... 54  
Appendixes  
Appendix A - TCP/IP (Transmission Control Protocol/Internet Protocol) Description ............................... 56  
Index  
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Chapter 1 - Introduction and Description  
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Dual Ethernet ProxyServer User Guide  
Introduction  
Welcome to Multi-Tech's new Dual Ethernet ProxyServer, model number MTPSR1-120, a high  
speed Internet access device that provides firewall protection to your corporate (secured) LAN  
and allows Internet access to the Internet Services Network (public LAN) that resides outside the  
firewall. Internet access can be provided through new technologies, such as cable or DSL  
modems, connecting to an existing high speed public LAN, or connecting the RS232 WAN port  
on the back of the unit that allows Internet access up to T1/E1 access speeds. The Dual Ethernet  
ProxyServer provides two Ethernet connections that implement firewall protection and gateway  
security for your LAN resources and provides megabit data transfer rates (up to 20 times faster  
than a 56K modem) for your Internet access.  
The Dual Ethernet ProxyServer provides two Ethernet 10Base-T ports which connect your  
private secured LAN to the LAN 1 connection and the Internet Services Network resources to the  
LAN 2 connection, and a Command port for configuration. An additional RS232/V.35 port is  
provided for an alternate connection to an external WAN for connecting your secure corporate  
LAN directly to an ISP. System management is provided through the command port using  
bundled Windows® software which provides easy-to-use configuration menus.  
Figure 1-1. Dual Ethernet ProxyServer  
Preview of this Guide  
This guide describes the ProxyServer and tells you how to install and configure the unit. The  
information contained in each chapter is as follows:  
Chapter 1 - Introduction and Description  
Chapter 1 describes the Dual Ethernet ProxyServer. Descriptions of Transmission Control  
Protocol/Internet Protocol (TCP/IP) and Internet Protocol (IP), front panel indicators, and back  
panel connectors are provided. In addition, a list of relevant specifications is provided at the end  
of the chapter.  
Chapter 2 - Installation  
Chapter 2 provides information on unpacking and cabling your ProxyServer. The installation  
procedure describes each cable connection.  
Chapter 3 - Software Loading and Configuration  
Chapter 3 provides instructions for software loading and initial configuration. The ProxyServer  
software diskettes are Windows® based. Later chapters, as well as your on-line help program will  
describe the ProxyServer software in more detail.  
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Chapter 1 - Introduction and Description  
Chapter 4 - ProxyServer Software  
Chapter 4 describes the ProxyServer software package designed for the Windows ®  
environment. This chapter describes the ProxyServer software from an applications standpoint,  
and in so doing, not every screen is shown, nor is each field within a screen defined. For  
explanations and parameters of each field within a dialog box please refer to the on-line help  
system provided within the software.  
Chapter 5 - Remote Configuration and Management  
Chapter 5 provides procedures for changing the configuration of a remote ProxyServer. Remote  
configuration allows you to change the configuration of a unit by simply connecting two modems  
between the two ProxyServers and remotely controlling the unit. In addition, remote management  
utilities such as Telnet and Web-based management of the ProxyServer  
Chapter 6 - Warranty, Service and Tech Support  
Chapter 6 provides instructions on getting service for your ProxyServer at the factory, a  
statement of the limited warranty, information about our Internet presence, and space for  
recording information about your ProxyServer prior to calling Multi-Tech’s Technical Support.  
Appendixes  
Appendix A - TCP/IP (Transmission Control Protocol/Internet Protocol) Description  
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Dual Ethernet ProxyServer User Guide  
Front Panel Description  
The front panel, shown in Figure 1-2, contains four groups of LEDs that provide the status of the  
LAN connection, link activity, and general status of the ProxyServer. The Ethernet 1 and Ethernet  
2 LEDs display the activity of the public and private LANs, in whether the ProxyServer is  
connected to the LAN, transmitting or receiving packets, and if a collision is in progress. The  
WAN Link LEDs display the status of the RS232/V.35 WAN link, that can optionally be connected  
to an external DCE device, in whether the link is ready to transmit or receive serial data, and if an  
external communications device with a V.35 interface is connected to the ProxyServer. The last  
group of LEDs indicate whether the self test passed or failed and if the power On/Off switch on  
the back of the ProxyServer is turned On.  
Figure 1-2. Front Panel  
ETHERNET 1 and 2  
RCV Receive Data indicator blinks when packets are being received from the private (Ethernet  
1) or public (Ethernet 2) LANs.  
XMT Transmit Data indicator blinks when packets are being transmitted to the private  
(Ethernet 1) or public (Ethernet 2) LANs.  
LNK  
Link indicator lights when the Ethernet link senses voltage from a concentrator or  
external device.  
WAN Link  
RCV Receive Data indicator blinks when packets are being sent to the local area network.  
XMT Transmit Data indicator blinks when packets are being transmitted from the local area  
network.  
CD  
Carrier Detect indicator lights when a carrier signal is detected on the WAN link.  
V.35 indicator lights when internal shunt is set for V.35 operation.  
V35  
Fail  
ERR Error indicator lights when the ProxyServer is booting or downloading setup.  
Power  
PWR Power indicator lights when power is applied to the ProxyServer.  
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Chapter 1 - Introduction and Description  
Back Panel Description  
The cable connections for the ProxyServer are made at the back panel. In addition to the Power  
connector, Three groups of connectors are used on the ProxyServer: the Command Port,  
Ethernet 1 & 2 (10BASET) and RS232/V.35. The cable connections are shown in Figure 1-3 and  
defined in the following groups.  
ETHERNET  
COMMAND  
POWER  
RS232/V.35  
2
1
ON  
OFF  
10BASET  
10BASET  
Figure 1-3. Back Panel  
RS232/V.35 Connector  
The RS232/V.35 (DB-25) connector is used to connect the ProxyServer to an external modem,  
DSU, or other Data Communications Equipment (DCE). This connection can be either RS232C  
(default) or V.35. If the connection is V.35, then the shunt must be moved from the default RS232  
position to the V.35 position (for details on this procedure, refer to Chapter 2 - V.35 Shunt  
Procedure).  
Ethernet 1 and 2 10Base-T Connectors  
The Ethernet 10Base-T connectors are used to connect the ProxyServer to a LAN using  
unshielded twisted cable. Ethernet 1 connects the private LAN, and Ethernet 2 connects the  
public LAN. These connectors are RJ-45 jacks.  
Command Connector  
The Command connector is used to configure the ProxyServer using a PC with a serial port and  
running Windows® software. The Command connector is an RJ-45 jack and a short adapter  
cable is provided to convert to a standard serial port DB-25 female connector.  
Power Connector  
The Power connector is used to connect the external power supply to the ProxyServer. The  
Power connector is a 6-pin circular DIN connector. A separate power cord is connected to the  
power supply and the live AC grounded outlet.  
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Dual Ethernet ProxyServer User Guide  
Specifications  
Protocols - Point-To-Point Protocol (PPP), and Serial Line Internet Protocol (SLIP)  
Ethernet Ports  
Two Ethernet Interface - 10Base-T (twisted pair) RJ-45 connectors.  
Command Port  
Single 19.2K bps asynchronous Command Port using a short RJ-45 to DB-25 cable with a  
DB-25 female connector  
WAN Link  
One RS232/V.35 port connector.  
Electrical/Physical  
Voltage - 115 VAC (Standard), 240 Volts AC (Optional)  
Frequency - 47 to 63 Hz  
Power Consumption - 10 Watts  
Dimensions - 1.625" high x 6" wide x 9" deep  
5.63cm high x 22.34cm wide x 33.51cm deep  
Weight - 2 pounds (.92 kg)  
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Chapter 2 - Installation  
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Dual Ethernet ProxyServer User Guide  
Safety Warnings  
1.  
Never install telephone wiring during a lightning storm.  
2.  
Never install telephone jacks in wet locations unless the jack is specifically designed for  
wet locations.  
3.  
Never touch uninsulated telephone wires or terminals unless the telephone line has been  
disconnected at the network interface.  
4.  
5.  
Use caution when installing or modifying telephone lines.  
Avoid using a telephone (other than a cordless type) during an electrical storm. There  
may be a remote risk of electrical shock from lightning.  
6.  
Do not use the telephone to report a gas leak in the vicinity of the leak.  
Unpacking Your ProxyServer  
The shipping box contains the Dual Ethernet ProxyServer, external power supply, power cord,  
Command Port (DB-25 to RJ-45) cable, your Quick Start Guide, and three diskettes (i.e., the  
ProxyServer User Guide, and the ProxyServer Software). Inspect the contents for signs of any  
shipping damage. If damage is observed, do not power up the unit, contact Multi-Tech’s Technical  
Support for advice (refer to Chapter 6). If no damage is observed, place the ProxyServer in its  
final location and continue with the next section.  
MADE IN U.S.A  
MADE IN U.S.A  
Figure 2-1. Unpacking  
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Chapter 1 - Introduction and Description  
V.35 Shunt Procedure  
If you are using an external DCE device on the WAN RS232/V.35 port, and the connection will be  
a V.35 connection, the internal shunt must be moved from the RS232C (default) position prior to  
cabling and power-up. The following steps detail the procedures for switching the shunt.  
Step Procedure  
1
2
Ensure that the external power supply is disconnected from the ProxyServer.  
Turn the ProxyServer over and remove the cabinet mounting screw from the chassis.  
Back Panel  
Front Panel  
Cabinet Mounting Screw  
Figure 2-2. Cabinet Mounting Screw  
3
Being sure to support the back panel, turn the ProxyServer right-side-up, tilt the back  
panel down, and slide the circuit board out of the chassis.  
4
5
Place the unit on a flat, grounded surface with the LED’s facing you.  
Pry the shunt out of the RS232 position, and insert it in the V.35 position.  
Back Panel Connectors  
LEDs  
V.35 Shunt Position  
RAM Sockets  
RS232C Shunt Position  
Figure 2-3. Shunt Positions  
6
7
8
Align the board with the guide slots on the inside of the chassis and carefully slide the  
board back into the chassis.  
Being sure to support the back panel, turn the ProxyServer over again, and replace the  
cabinet mounting screw.  
Turn the ProxyServer right-side-up again and proceed to the next section to connect the  
cables.  
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Dual Ethernet ProxyServer User Guide  
Cabling Your ProxyServer  
Cabling your ProxyServer involves making the proper Power, Command Port, and two Ethernet  
connections. An optional WAN connection is provided to connect to an external WAN device.  
Figure 2-4 shows the back panel connectors and the associated cable connections, and the table  
that follows details the procedures for connecting the cables to your ProxyServer.  
ETHERNET  
COMMAND  
POWER  
2
1
ON  
RS232/V.35  
OFF  
10BASET  
10BASET  
Power  
Connection  
WAN  
Connection  
Internet  
LAN  
Secured  
LAN  
PC  
Connection  
Figure 2-4. Cable Connections  
Cabling Procedure  
Step  
Procedure  
1.  
Connect one end of the power supply to a live AC outlet and connect the other end to the  
ProxyServer as shown in Figure 2-4. The power connector is a 6-pin circular DIN  
connector.  
2.  
Connect the ProxyServer to a PC by using the short RJ-45 to DB-25 (female) cable  
provided in your unit. Plug the RJ-45 end of the cable into the Command port of the  
ProxyServer and the other end into the RS-232 cable from the PC serial port. See Figure  
2-4.  
3.  
4.  
To connect your secure (private) LAN, connect one end of an RJ-45 (UTP) cable to the  
LAN 1 connector on the back of the ProxyServer. Connect the other end of the cable to  
your private LAN.  
To connect a cable modem, DSL modem, or your Internet (public) LAN, connect one end  
of an RJ-45 (UTP) cable to the LAN 2 connector on the back of the ProxyServer.  
Proceed to step 6.  
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Chapter 2 - Installation  
Table 2-1. (cont’d.)  
Step  
Procedure  
5.  
If a cable modem, DSL modem, or your Internet LAN is being used, no cable connection  
will be made to the RS232/V.35 connector on the back of the ProxyServer.  
If the RS232/V.35 connector on the ProxyServer is going to be connected to a WAN  
device (i.e., connecting your secure (private) LAN to an ISP, connect one end of an  
RS232 or V.35 interface cable to the RS232/V.35 connector on the back of the  
ProxyServer. Connect the other end of this cable to the WAN device.  
6.  
Turn on power to the ProxyServer by placing the ON/OFF switch on the back panel to  
the ON position. Wait for the Fail LED on the ProxyServer to go OFF before proceeding.  
This may take a couple of minutes to go OFF.  
At this time your ProxyServer is completely cabled. Proceed to Chapter 3 to load the Firewall  
software.  
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Dual Ethernet ProxyServer User Guide  
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Chapter 3 - Software Loading and Configuration  
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Dual Ethernet ProxyServer User Guide  
Loading Your Software  
The following loading procedure does not provide every screen or option in the process of  
installing the Firewall software. The assumption is that the installation is being performed by a  
technical person with a thorough knowledge of Windows and the software loading process.  
Additional information on the Firewall software is provided in the Chapter 4, and in the on-line  
help provided with your Firewall software.  
1.  
2.  
Run Windows on the PC connected to the Command Port.  
Insert the ProxyServer diskette labeled Disk 1 into the disk drive on the PC connected to  
the Command port.  
3.  
Win3.1 users - In Program Manager click File | Run. In the Run dialog box, type  
a:\setup or b:\setup (depending on the location of your floppy disk drive) in the  
Command Line field and then click OK.  
Win95 users - click Start | Run. In the Run dialog box click on the down arrow and  
choose a:\setup or b:\setup (depending on the location of your floppy disk drive) in the  
Command Line field and then click OK.  
4.  
Follow the on-screen instructions to install your Firewall software.  
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Chapter 3 - Software Loading and Configuration  
5.  
The following dialog box selects the COM port of your PC connected to the Command  
port of the ProxyServer. From the Select Port window, click on the down arrow and  
choose the COM port of your PC.  
Click OK to continue.  
6.  
Click Finish to continue.  
7.  
The “Do you want to download default setup?” dialog is displayed.  
Click Yes to download the default setup. Clicking No prevents the defaults from being  
down loaded to the ProxyServer.  
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Dual Ethernet ProxyServer User Guide  
IP Port Configuration  
This dialog allows for the configuration of IP parameters that are generally applicable to IP  
proxying on all ports.  
8.  
The Secured LAN Port Parameters have to be changed to your private (secure) LAN  
parameters. Enter your Secured LAN Port IP Address in the IP Address field, followed by  
the Net Mask in its field, and finally the Default Route IP address.  
The Secured LAN Port IP Address can be an unregistered IP address. The Internet LAN  
port IP address and the Gateway IP address must be in the same IP network.  
9.  
The Internet LAN Port Parameters depend on how LAN 2 on the ProxyServer is  
configured. If a DHCP Server is providing IP addresses, click on the OK button and  
proceed to step 13.  
If a DHCP Server is not providing the IP address, then click on the DHCP Client option  
and the IP Address and Net Mask fields become active. Enter your valid Public LAN IP  
address in the IP Address field, also, enter your valid Net Mask in its field.  
DHCP Relay Agent does not apply.  
10.  
If a cable modem, DSL modem, or your public (Internet) LAN is connected to LAN 2 on  
the ProxyServer, the WAN Port Parameters are not required.  
The WAN Port Parameters are only required if a device is connected to the RS-232/  
V.35 connector on the back of the ProxyServer. If your ISP for your local (secured LAN)  
dynamically assigns the WAN port IP addresses, you do not have to do anything for the  
WAN Port Parameters. Proceed to the step 12.  
If a static WAN Port IP address needs to be assigned, click on the ISP assigns Dynamic  
Address check box to disable the feature, then click on the IP Address field and enter  
your registered WAN Port IP address. Also, enter the Net Mask for WAN port.  
11.  
If a DHCP Server is not providing the IP addresses in step 9 and a cable modem, DSL  
modem, or your public (Internet) LAN is connected to LAN 2 on your ProxyServer, then  
click on the Internet LAN IP Address field and enter the valid Gateway IP address (i.e.,  
the IP address of the cable or DSL modem, or your public (Internet) LAN router’s  
address).  
If a static WAN Port IP was assigned in step 10 and the Internet access is through the  
RS232 connection on the back of the ProxyServer, then click on the Internet Gateway  
Parameters WAN option.  
12.  
Click OK.  
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Chapter 3 - Software Loading and Configuration  
Default WAN Link Configuration  
The default WAN Link(s) Setup dialog box is only used if a device is connected to the RS-232/  
V.35 connector on the back panel of the ProxyServer. This connection allows your private  
(secured) LAN to be connected to a local ISP for Internet service.  
If a cable modem, DSL modem, or your public (Internet) LAN is connected to LAN 2, then the  
Default WAN Link has to be disabled.  
13.  
If a cable modem, DSL modem, or Internet LAN is connected to LAN 2, click on the  
Enable option to disable the WAN port. Click OK and proceed to step 18 to download the  
default setup.  
If a device is connected to the RS-232/V.35 connector on the back of the ProxyServer,  
proceed to step 14.  
14.  
15.  
Click on the down arrow for the Modem Type and choose the device from the listing that  
is connected to the RS-232/V.35 connector.  
Click on Dial Number and enter the telephone number supplied by your ISP. The  
telephone number can be a standard local number and it can include a long distance  
prefix.  
16.  
Click on User Name and enter your user name that you negotiated with your ISP. The  
User Name can be up to 40 alphanumeric characters. The User Name is not case  
sensitive.  
17.  
18.  
Click on Password and enter your password that you negotiated with your ISP. The  
password can be up to 15 alphanumeric character and also is not case sensitive.  
Turn on power to the ProxyServer and the checking ProxyServer dialog box is displayed.  
The Setup utility is "Ready to Download default Setup Choose OK to proceed." Click OK  
to proceed.  
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Dual Ethernet ProxyServer User Guide  
19.  
The Writing Setup dialog box is displayed as the setup configuration is written to the  
ProxyServer.  
20.  
21.  
Check to ensure that the FAIL LED on the ProxyServer is Off after the download is  
complete and the ProxyServer is rebooted.  
Win3.1 users - you are returned to your Program Manager where the Firewall Program  
Group and Program Item (Windows icons) have been created.  
Win95 users - you are returned to the Firewall folder which will be visible on your  
desktop.  
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Chapter 4 - Firewall Software  
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Dual Ethernet ProxyServer User Guide  
Introduction  
This chapter describes the Firewall software used in the Dual Ethernet ProxyServer. It begins  
with the description of three typical applications for the ProxyServer. These configuration  
examples are followed by a description of the Firewall program group, and examples of how to  
add some of the advanced features provided with the software.  
Typical Applications  
This section describes three typical applications for the Dual Ethernet ProxyServer. This is done  
with the assumption that the unit will be configured for a particular application during the initial  
installation. The three examples include a detailed diagram, along with a description of the  
process involved in setting up the configuration shown.  
The first of the applications uses the ProxyServer to connect your private LAN to the Internet  
using a cable or Digital Subscriber Line (DSL) modem, providing high speed Internet access. The  
second application ties your private LAN and public Internet Services Network (e.g., your existing  
public LAN) through its router to the Internet. The third application is similar to the second, but  
uses a Data Communications Equipment (DCE) device—in this example, a T1 DSU—connected  
to the RS232 port on the back of the ProxyServer to connect to the Internet.  
Configuration 1 - Cable/DSL Modem  
In the configuration shown in Figure 4-1, the Dual Ethernet ProxyServer is connected to the  
private LAN via the LAN 1 connection of the back of the ProxyServer. Connection to the Internet  
is then provided by the cable or DSL modem by connecting the Ethernet connector on the  
modem to the LAN 2 connection on the ProxyServer.  
Internet  
Cable/DSL  
Modem  
LAN 2  
Public  
MTPSR1-120 Firewall  
IP Address 192.168.0.101  
Mask 255.255.255.0  
LAN 1  
Private  
HUB  
Private LAN  
NovellTM Server  
Workstation  
IP Address  
IP Address  
192.168.0.107  
192.168.0.102  
Windows NTTM Server  
IP Address  
192.168.0.103  
Workstation  
IP Address  
192.168.0.106  
Workstation  
IP Address  
192.168.0.105  
Mail Server  
IP Address  
192.168.0.104  
Figure 4-1. Cable/DSL Modem Configuration  
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Chapter 4 - Firewall Software  
During the loading of the Firewall software, the Secured LAN Port Parameters group (in the IP  
Setup dialog box) was configured to include an unregistered IP Address of 192.168.0.101 and  
default Net Mask of 255.255.255.0 for the private LAN (LAN 1). The Internet LAN Port  
Parameters group was configured with the DHCP Client option active. This enables the Internet  
Services Provider (ISP) to dynamically provide the registered Internet IP addresses. If a static IP  
addressing scheme is provided by the ISP, then the DHCP Client field in the Internet LAN Port  
Parameters group is deactivated and the IP Address field becomes active. The static IP address  
is then entered in this field.  
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Dual Ethernet ProxyServer User Guide  
Configuration 2 - Existing Dual-LAN with Router  
Another typical configuration ties the private LAN (LAN 1) to an existing Internet Services  
Network, which already provides Internet services. This configuration provides firewall and  
gateway security for the LAN users, and supports Internet access restrictions based on IP  
address, client protocols, or a list of forbidden sites.  
Internet  
MTPSR1-120 Firewall  
IP Address 192.168.0.101  
Mask 255.255.255.0  
Internet LAN  
IP Address 204.26.12.9  
Mask 255.255.255.0  
Router  
IP address  
204.26.12.10  
LAN 2  
Public  
LAN 1  
Private  
HUB  
HUB  
NovellTM Server  
IP Address  
192.168.0.102  
Workstation  
IP Address  
192.168.0.107  
Windows NTTM Server  
IP Address  
192.168.0.103  
Workstation  
IP Address  
192.168.0.106  
Workstation  
Mail Server  
IP Address  
192.168.0.104  
IP Address  
192.168.0.105  
Web Server  
IP Address  
204.26.12.20  
FTP Server  
IP Address  
204.26.12.30  
Video Server  
IP Address  
Private LAN  
204.26.12.40  
Internet Services  
Network  
Figure 4-2. Existing Dual-LAN with Router Configuration  
In the configuration shown in Figure 4-2, the ProxyServer is connected to the private LAN via the  
LAN 1 connection of the back of the ProxyServer. The Internet Services Network, or public LAN,  
is connected to the LAN 2 connector on the back of the unit. Connection to the Internet is then  
provided by the existing router connected to the Internet Services Network.  
During the loading of the Firewall software, the Secured LAN Port Parameters group (in the IP  
Setup dialog box) was configured to include an IP Address of 192.168.0.101, and a default Net  
Mask of 255.255.2.55.0 for the private LAN (LAN 1). The Internet LAN Port Parameters group  
was configured with the DHCP Client option disabled, and the static IP Address of 204.26.12.10  
was entered. This address is the existing static IP address that had already been assigned to the  
Internet Services Network router. A Net Mask of 255.255.255.0 was then entered to complete the  
configuration of the public LAN (LAN 2).  
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Chapter 4 - Firewall Software  
Configuration 3 - New Dual-LAN with T1 DSU  
The final typical configuration adds Internet services to existing LAN users. With this  
configuration, the private LAN (LAN 1) is secured by the firewall while the Internet Services  
Network is outside the firewall allowing Internet users to access the public LAN (LAN 2)  
resources, such as the Web, FTP, etc. servers. The Internet connection is provided with a T1  
DSU connected to the RS232 connection on the back of the unit.  
Internet  
T1 DSU  
WAN Port  
MTPSR1-120 Firewall  
IP Address 192.168.0.101  
Mask 255.255.255.0  
LAN 1  
Private  
LAN 2  
Public  
Internet LAN  
IP address  
204.26.12.10  
HUB  
HUB  
NovellTM Server  
IP Address  
192.168.0.102  
Workstation  
IP Address  
192.168.0.107  
Windows NTTM Server  
IP Address  
192.168.0.103  
Workstation  
IP Address  
192.168.0.106  
Workstation  
Mail Server  
IP Address  
192.168.0.104  
IP Address  
Web Server  
192.168.0.105  
FTP Server  
Video Server  
IP Address  
IP Address  
IP Address  
204.26.12.20  
204.26.12.30  
204.26.12.40  
Private LAN  
Internet Services  
Network  
Figure 4-3. New Dual-LAN with T1 DSU Configuration  
In the configuration shown in Figure 4-3, the ProxyServer is connected to the private LAN via the  
LAN 1 connection of the back of the ProxyServer. The Internet Services Network, or public LAN,  
is connected to the LAN 2 connector on the back of the unit. Connection to the Internet is then  
provided by a T1 DSU connected to the RS232/V.35 connector on the back of the unit.  
During the loading of the Firewall software, the Secured LAN Port Parameters group (in the IP  
Setup dialog box) was configured to include an unregistered IP Address of 192.168.0.101 and  
default Net Mask of 255.255.255.0 for the private LAN (LAN 1).  
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Dual Ethernet ProxyServer User Guide  
The Internet LAN Port Parameters group is either configured with the DHCP Client option  
active, enabling the ISP to dynamically provide the registered Internet IP addresses, or with the  
DHCP Client option disabled if a static IP addressing scheme is provided by the ISP. If the DHCP  
Client field is deactivated the static IP Address of 204.26.12.10 is then entered and the WAN  
option is checked in the Internet Gateway Parameters group.  
In the Default WAN Link Setup dialog, the WAN Enable option is activated.  
In the Dial Number field, the number for the ISP is entered and in the User Name and  
Password fields, the user name and password agreed upon with the ISP are entered.  
The sections that follow provide examples of how to add some of the advanced features that  
enhance and build upon this basic setup.  
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Chapter 4 - Firewall Software  
Firewall Program Group  
This section describes the advanced features of your Firewall software. The major configuration  
parameters are set when the software is loaded into your PC and the setup configuration is  
downloaded to the ProxyServer at the conclusion of the software installation. Our intent is not to  
cover every dialog box nor every field within a dialog box. The ProxyServer on-line help provided  
with your software provides such definitions, along with explanations of parameters and defaults  
where applicable. This constitutes a dynamic help system in that the information presented  
always relates to the dialog box or window that is currently open.  
Your Firewall Program Group contains several applications which provide the maximum flexibility  
for configuration and use. These applications are also accessible in Windows by clicking Start |  
Programs | Firewall | (application). The various options include Configuration Port Setup,  
Download Default Setup, Download Firmware Update, Firewall Configuration, Uninstall Firewall  
Configuration and Wan Device Configuration.  
Firewall Configuration will be discussed in detail later in this chapter. A brief description of the  
other components is provided here:  
Configuration Port Setup  
The Configuration Port Setup program allows you to set up and configure the configuration port  
on your ProxyServer. This dialog is included in the initial installation process. Although  
parameters can be changed, be sure to note the current status of the software before making any  
alterations.  
When you installed the Firewall software, you selected to configure the port as either an IP or  
COM Port. When COM Port is selected, you can assign the proper COM Port and define the  
modem Init String, Dial String, and various responses. If IP is selected, you can assign a static IP  
address or select one from the drop down list. For more information on each individual  
parameter, refer to the on-line help provided with the software.  
Download Default Setup  
This feature allows you to download the default settings, configured during installation, to the  
ProxyServer. If you are installing for the first time, you will download this setup at the end of the  
installation before operating the ProxyServer. If you have made changes to the Firewall  
Configuration and wish to revert to the default setup, you can do so through the Firewall Program  
Group.  
Choose Download Default Setup to download the factory default settings. If the ProxyServer is  
running, you will be queried to reboot. Click Yes to continue with the download. You will then be  
presented with two dialogs including IP Setup and Default WAN Link(s) Setup. These screens  
will contain the original setup information. Click OK on each to accept the default settings, or  
make any necessary changes and then click OK. When prompted, click OK again to proceed  
with the download. The default setup will be written to the Firewall. This process may take a few  
minutes. When it is finished, you will be returned to Windows.  
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Download Firmware Update  
This application allows you to update the firmware of the ProxyServer. This may be necessary in  
the case of repair or upgrade. To download the firmware update, choose Download Firmware  
Update from the Firewall Program Group, and the Open dialog box is displayed (if the  
ProxyServer is running, you will be queried to reboot to update firmware; click OK to proceed and  
the Open dialog will be displayed).  
By default, the Firewall software will display the proper firmware from the Firewall folder. Double  
click on this file in the File Name list.  
The Downloading Code dialog is displayed, which includes a status bar to monitor the download.  
When the download is complete the ProxyServer will reboot. This process will take several  
minutes. After rebooting, you will be returned to Windows.  
Uninstall Firewall Configuration  
Selecting Uninstall Firewall Configuration will allow you to completely remove all the components  
of the Firewall Program Group. Upon selecting this option your will be queried for confirmation.  
Click Yes to continue with the uninstall, or click No to abort.  
Note: You will not be able to use the ProxyServer without Firewall Configuration. If you remove  
the components, you will need to reinstall the software. Refer to your ProxyServer Firewall Quick  
Start Guide for installation instructions.  
WAN Device Configuration  
If you have an external WAN device connected to the WAN port of the ProxyServer, this  
application will open the Firewall Print Console, a terminal emulation program, that will allow  
configuration of the external device.  
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Chapter 4 - Firewall Software  
Firewall Configuration  
To view or change your ProxyServer configuration in Windows 95, click on the Start | Programs  
| Firewall | Firewall Configuration. After loading, the Firewall Setup menu will appear.  
The Firewall Setup menu consists of 13 buttons which allow you to display and change the  
protocol stacks, define the output of the ProxyServer, perform network management functions,  
test the communications link, print messages received from the target ProxyServer, and  
download setup information to the ProxyServer.  
In the bottom row, there are two buttons to open the on-line Help system (Firewall Setup Help)  
and end (Exit) a Proxy configuration session.  
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Changing IP Parameters  
The IP Setup dialog box establishes the IP addressing for your private LAN, Public LAN, and, if  
the Proxy Server is directly connected to the Internet, the WAN port. To change the IP Setup  
parameters that were configured during the initial setup, click on the IP button in the Firewall  
Setup menu. The IP Setup dialog is displayed.  
The Secured LAN Port Parameters group is used to assign the Ethernet parameters of your  
private LAN (LAN 1) port. If a router is used to connect a second private LAN, the IP address of  
that router is also entered in this group.  
IP Address - This field defines the IP address of the private LAN (LAN 1) port on the  
ProxyServer. This must be a unique host IP address that falls in the LAN IP network, and can  
be an unregistered address.  
Net Mask - This field defines the Subnetwork Mask of the private LAN (LAN 1) port on the  
ProxyServer.  
Default Route - This field defines the IP address of a router on the private LAN that connects  
a second private LAN to the ProxyServer.  
The Internet LAN Port Parameters group is used to configure the public LAN (LAN 2) port. The  
parameters of this group will vary, depending on the LAN configuration. The Internet LAN Port  
Parameters group defines the static or dynamic addressing scheme for the public LAN (LAN 2)  
DHCP Client - If this option is active, the Internet Services Provider (ISP) is able to  
dynamically provide the registered Internet IP addresses. If a static IP addressing scheme is  
provided by the ISP, then the DHCP Client option must be deactivated and the IP Address  
field becomes active. The static IP address is then entered in this field.  
IP Address - If the DHCP Client option is active, this address is dynamically  
assigned by the ISP. If the DHCP Client is inactive, then the static IP address of the  
router connected to the Internet Services Network is entered in this field.  
Net Mask - If the DHCP Client option is active, the Net Mask is dynamically assigned  
by the ISP. If the DHCP Client is inactive, then the Net Mask of the router connected  
to the Internet Services Network is entered in this field.  
DHCP Relay Agent - Enabling this option allows the ProxyServer to relay IP address  
requests from the Internet to the DHCP server through the WAN. If this option is enabled, the  
DHCP Server Address field becomes active, and the IP address of the DHCP server must be  
entered.  
DHCP Server Address - If the DHCP Relay Agent option is active, enter the IP  
address of the DHCP server in this field.  
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Chapter 4 - Firewall Software  
The WAN Port Parameters group is used to configure the WAN port, if enabled. The WAN port  
parameters are established when the ProxyServer is directly connected to the Internet via the  
RS232/V.35 connector on the back of the unit.  
ISP Assigns Dynamic Address - Normally, the ISP assigns a dynamic address when the  
port comes up. If this is not the case, disable this option and assign a valid registered Internet  
address in the IP Address field.  
IP Address - If dynamic addressing is enabled, this field is dynamically assigned by  
the ISP. If static addressing is enabled, enter a valid Internet address in this field.  
Net Mask - Enter the Subnetwork Mask for the WAN port in this field.  
The Internet Gateway Parameters group is used to configure the Internet gateway if used by  
the Internet LAN (LAN 2) port.  
WAN - If a connection to the Internet Services Network is provided via a DCE device  
connected to the RS232/V.35 port on the back of the ProxyServer, then this option must be  
selected.  
Internet LAN - If a connection to the Internet Services Network is provided through the  
Internet LAN (LAN 2), then this option must be selected. If the Internet LAN is configured as  
a DHCP Client, then the IP address will be dynamically assigned by the ISP. If the DHCP  
Client option is disabled, then a valid registered Internet address must be entered in the IP  
Address field.  
IP Address - If the Internet LAN is configured as a DHCP Client, this address will be  
dynamically assigned by the ISP. If the DHCP Client option is disabled, the a valid  
registered Internet address must be entered in the IP Address field.  
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Changing WAN Port Parameters  
In order to change the WAN port parameters of a DCE device connected to the RS232/V.35  
connector on the ProxyServer, click on the WAN button in the Firewall Setup menu. The WAN  
Port Setup dialog box is displayed.  
From this dialog, you can configure the parameters of the WAN port. To enable the WAN port,  
click on the Port Enable check box.  
The Mode group allows you to configure the WAN interface to match the DCE device connected  
to the RS232/V.35 port on the ProxyServer. Options include Asynchronous or Synchronous  
mode. If asynchronous is chosen, you can select the proper Baud speed. If synchronous is  
chosen, External Clocking or Internal Clocking must be selected.  
The Connection Method group allows you to configure the port as Direct Connect/Leased  
Line, Answering or Dialing, and allows you to select the Modem Type and Dial Number for the  
DCE device.  
For a detailed description of each field, refer to the on-line help provided with your Firewall  
software.  
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Chapter 4 - Firewall Software  
Adding Proxy Applications  
Certain software on your LAN may require a TCP or UDP port usage that is not currently  
supported by the ProxyServer. If this is the case, you must refer to the software documentation to  
determine the proper port usage and number. Without this information, the Proxy will not allow  
packets through to the Internet from the unknown software. Once the necessary information has  
been determined, you can add the application(s) to the supported list.  
This list includes many of the most common port usages, however, not all are included because  
an increase in the number of port usages supported means a possible decrease in performance  
speed, and an increased security risk.  
If you wish to add ProxyServer applications that are not currently supported, click on the Proxy  
Server button in the Firewall Setup menu. The Proxy Applications Configuration dialog box  
appears. This menu includes a list of all the applications currently supported by the ProxyServer.  
Click on the Add button. The Add/Edit Entry dialog box appears.  
This dialog will allow you choose the desired protocol, and enter a Port Name/Number and  
Description. After you have entered these items, click on OK to add the port usage to the list of  
supported usages.  
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Enabling the DHCP Server  
The DHCP Server feature of the ProxyServer manages all the IP address assignments on the  
private LAN. IP address management becomes completely transparent.  
To enable the DHCP Server ability in the ProxyServer, click on the DHCP Server button in the  
Firewall Setup menu. The DHCP Server Setup dialog box appears.  
The DHCP Server Setup menu allows you to customize each client PC configuration from one  
central point. You can establish a range of client addresses in the Manage Addresses group.  
You can then exclude specific addresses from that range in the Exclude Range field. You can  
also add, delete, edit and bind addresses using the corresponding buttons in this group.  
The Option Types and Values group on the bottom portion of the menu allows you to customize  
the configuration of the client platform. Again, you can add, delete and edit an option by  
highlighting it and clicking on the appropriate button. You cannot, however, edit or delete entries  
provided in the default list.  
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Chapter 5 - Remote Configuration and Management  
Enabling PPP/SLIP  
If you wish to use Point to Point Protocol (PPP) or Serial Line IP Protocol (SLIP) on the WAN  
port, you can enable in the PPP/SLIP menu. In order to configure these options, you must first  
enable the WAN port.  
To enable the WAN port, click on the WAN button in the Firewall Setup menu. The WAN Setup  
dialog box appears.  
Click on the Port Enable check box enable the WAN port. Click OK.  
You are returned to the Firewall Setup menu. Click on PPP/SLIP. The PPP Port Setup menu is  
displayed.  
Enabling PPP  
If you wish to configure the port for use with PPP, click on the Enable check box in the PPP  
group. Enter a valid User Name and Password and verify (or change) the Periodic Timer and  
Number of Retries (for definition and parameters of a specific field, refer to the on-line help).  
By default, Dial On Demand is enabled. If you do not wish to use this feature, click on the Enable  
check box in the Dial On Demand group to disable it.  
When you have finished the configuration, click OK. You are returned to the Firewall Setup  
menu. Click Download Setup to save the new configuration to the ProxyServer.  
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Enabling SLIP  
If you wish to configure the port for use with SLIP, click on the Enable check box in the SLIP  
group.  
The following message appears:  
Click OK. This value was assigned in the initial software installation and was downloaded to the  
ProxyServer at the end of the installation. If you wish to verify or change the WAN IP address,  
click on IP in the Firewall Setup menu.  
If you wish to make use of CSLIP (Van Jacobsen Compression), click on the CSLIP (Van  
Jacobsen Compression check box to enable CSLIP. Verify (or change) the Maximum Transmit  
Unit value (for definition and parameters of a specific field, refer to the on-line help).  
By default, Dial On Demand is enabled. If you do not wish to use this feature, click on the Enable  
check box in the Dial On Demand group to disable it.  
When you have finished the configuration, click OK. You are returned to the Firewall Setup  
menu. Click Download Setup to save the new configuration to the ProxyServer.  
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Chapter 4 - Firewall Software  
Applications  
In addition to local configuration, the ProxyServer supports various applications which allow it to  
be configured remotely from anywhere on the connected Internet. To manage these applications,  
click Others in the Proxy Setup menu.  
The Applications Setup dialog box appears.  
Enter a valid Server Password and Server IP Address (the IP address of the ProxyServer) and  
then verify that the desired applications are enabled. By default, the ProxyServer supports Telnet,  
TFTP, WEB, and Dumb Terminal management. If you wish to disable any of these applications,  
click the corresponding check box to disable support.  
For more information on using these remote configuration applications, please refer to Chapter 5.  
Statistics  
The ProxyServer is capable of providing statistics for each port and for the whole system. These  
statistics can be useful for troubleshooting and management purposes. To access this  
information, click Statistics in the Proxy Setup menu. The Statistics dialog box is displayed.  
From this menu, you can query the details of a specific port or observe total system statistics  
such as Total System Up Time, and Total Calls. In addition, statistics can be saved to a log file for  
future use.  
For more details and parameters about specific fields within the statistics dialog, refer to the on-  
line help.  
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Filtering  
The IP Filtering Setup dialog provides tabs that let you configure the ProxyServer so that IP  
packets that are received by the server can be selectively filtered or forwarded based on their  
addresses or by the protocol ports to which they are destined.  
The three filtering methods are:  
IP Protocol Port Based Filtering - In this method, IP packets can be filtered based on their  
specific purposes; e.g. Telnet packets (TCP based) or TFTP (UDP based) can be filtered or  
forwarded.  
IP Address Based Filtering - In this method, filtering is based on the source and destination  
IP addresses in the packet.  
ICMP Filtering - Separate filtering support is provided for specific kinds of received ICMP  
packets.  
For a more detailed description of filtering, refer to the on-line help provided with your Firewall  
software.  
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Chapter 5 - Remote Configuration and Management  
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Introduction  
This chapter provides procedures for changing the configuration of a remote unit. Remote  
configuration allows a PC at one site (local site) to dial a remote ProxyServer and change the  
configuration of that remote unit. Remote configuration can be accomplished either directly  
through the LAN or remotely using modems. To remotely configure a ProxyServer, a local PC  
needs to be connected to a dial-up line and the ProxyServer software configured to call the  
remote ProxyServer. The remote ProxyServer needs to have a modem connected to a dial-up  
line and the Command Port. Once the connection to the remote unit is made, you can change the  
configuration as you see fit. Once the configuration is changed, you can down load the new  
configuration to the remote ProxyServer. Refer to the Modem-Based Remote Configuration  
Procedure to remotely configure a ProxyServer.  
To configure the remote ProxyServer through the LAN, change the communication type to the IP  
based Trivial File Transfer Protocol (known as TFTP) and change the configuration as you see fit.  
Refer to the LAN-Based Remote Configuration Procedure in this chapter to configure a remote  
ProxyServer.  
Modem-Based Remote Configuration Procedure  
1
At the remote site, remove the serial cable from the PC to the Command Port connector  
on the back panel of the ProxyServer.  
2
At the remote site, connect a special cable (Remote Configuration Cable) to the  
Command Port connector on the back panel of the ProxyServer and the RS232  
connector on the modem. The special cable is a serial cable with male connectors on  
both ends.  
Connect the modem to your local telephone line.  
Provide your telephone number to the person verifying your configuration.  
3
4
At the main site, connect your local PC to a modem that is connected to a dial-up line.  
Install the ProxyServer software on the local PC. When installed, click Start | Programs  
| Firewall | Configuration Port Setup, or double click on the Configuration Port icon in  
the Firewall program group.  
5
The Firewall Setup dialog box is displayed.  
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Chapter 5 - Remote Configuration and Management  
Verify that the Communication Type is set for COM Port and the Select Port field is set  
for the COM port of your local PC.  
In the Dial String field, enter the AT command for dialing (ATDT) plus the phone number  
of the remote ProxyServer.  
If your Modem Initialization String, Initialization Response, or Connect Response values  
are different than the defaults in the dialog box, refer to your modem user documentation  
and change the default values to match your modem.  
Click OK when you are satisfied with your selections.  
6
7
Run the Proxy Server Configuration program. Click Start | Programs | Firewall |  
Firewall Configuration, or double click on the Firewall Configuration icon in the  
Firewall program group.  
The Dialing Router dialog box is displayed while software is dialing the remote  
ProxyServer.  
8
9
The Reading Setup dialog box is displayed.  
The Firewall Setup menu is displayed. This is the dialog box of the remote ProxyServer.  
Refer to the on-line help provided with your software for a description of each dialog box  
and field within a dialog box.  
10  
After you have changed the configuration of the remote ProxyServer, click Download  
Setup to update the configuration. The remote ProxyServer will be brought down, the  
new configuration written to the unit, and the unit will reboot.  
11  
12  
Click Exit when the downloading is complete.  
The Hangup connection with Router? dialog box is displayed  
Click Yes to disconnect the phone connection to the remote site.  
13  
14  
If the same telephone number is not going to be used again in the immediate future, you  
may want to remove it from the Port Setup dialog box.  
At the remote site, reconnect the ProxyServer to the serial port of the PC and from the  
Firewall program group double click on the Firewall Configuration icon to verify that the  
ProxyServer is running.  
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LAN-Based Remote Configuration Procedure  
Windows Sockets Compliant TCP/IP Stack  
The configuration program requires a Windows Sockets compliant TCP/IP stack. TCP/IP protocol  
software must be installed and functional before the configuration program can be used.  
1
You must assign an Internet (IP) address for the PC and for each node that will be  
managed by the configuration program. Refer to the protocol software documentation for  
instructions on how to set the IP addresses.  
Once you have completed this step, you should be able to use the protocol Ping  
command for the PC host name. You should also test the network interface configuration  
by Pinging another TCP/IP device that is connected to the network.  
2
3
Install the Proxy Server software on the local PC. When installed click Start | Programs  
| Firewall | Configuration Port Setup, or double click on the Configuration Port Setup  
icon in the Firewall program group.  
The Firewall Setup dialog box is displayed.  
Verify that the Communication Type field is set IP.  
In the Router IP Address field, enter the IP Address of the remote ProxyServer.  
Click OK when you are satisfied with your selections.  
4
5
Run the Proxy Server Configuration program. Click Start | Programs | Firewall |  
Firewall Configuration, or double click on the Firewall Configuration icon in the  
Firewall program group.  
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Chapter 5 - Remote Configuration and Management  
6
The Firewall Setup dialog box is displayed. This is the dialog box of the remote  
ProxyServer. Refer to the on-line help provided with your ProxyServer for the definition of  
each dialog box and field within a dialog box.  
7
After you have changed the configuration of the remote ProxyServer, click Download  
Setup to update the configuration. The remote ProxyServer will be brought down, the  
new configuration written to the unit, and the unit will reboot.  
8
9
Click Exit when the downloading is complete.  
Double click on the Firewall Configuration icon in the Firewall program group to verify  
that the ProxyServer is running.  
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Remote Management  
This section describes typical client applications that can be used to configure the ProxyServer  
remotely. It is important to note that although any subsequent changes to configuration can be  
made using these applications, the initial setup and configuration of the ProxyServer must be  
done on the local PC, using the ProxyServer software provided with your unit.  
Although establishing access to the ProxyServer varies between applications, the configuration  
functions mirror those of the ProxyServer software. For more information on ProxyServer  
software, refer to Chapter 4 - Proxy Server Software.  
Telnet  
A typical Telnet client application is described in this chapter. The Firewall ProxyServer has a  
built-in Telnet Server that enables Telnet client PCs to access the ProxyServer. A typical Telnet  
client is allowed to configure the ProxyServer and WAN devices. A typical TCP/IP program group  
is shown below with a Tcpman icon and a Telnet icon.  
The TCP/IP stack has to be loaded before the Telnet client (a Windows application) will run, and  
the Telnet Server option has to be selected from the Applications Setup dialog box using Firewall  
Configuration (see Chapter 4 - Applications). Double click on the Telnet icon (or shortcut) and a  
blank Telnet screen is displayed. Click Connect | Remote System and the Connect dialog box is  
displayed. Select (or enter) a Host Name (the IP address of the ProxyServer). In this example,  
the Host Name is 192.168.2.4.  
When you enter a valid Host Name (IP address) and click on Connect, you are immediately  
connected to the target ProxyServer and the Firewall Management Menu screen is displayed.  
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Chapter 5 - Remote Configuration and Management  
Firewall Management Menu  
The Firewall Management Menu provides two basic options: Firewall Configuration and WAN  
Device Configuration. A further option enables you to close the Telnet session from this menu by  
pressing the Esc key.  
Firewall Configuration  
Selecting Option 1 displays the Firewall Configuration menu with options that enable you to  
configure ProxyServer parameters and download settings. In addition, you can obtain statistics  
and system information, or reset the ProxyServer.  
For more details on Firewall configuration, refer to Chapter 4 - Firewall Software, and the on-line  
helps.  
WAN Device Configuration  
Selecting Option 2 displays the WAN Device Configuration options, which enable you to gain  
direct access to the DCE device on the WAN port.  
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Dual Ethernet ProxyServer User Guide  
WEB Management  
The ProxyServer can be accessed, via a standard web-browser, from anywhere on the  
connected Internet. In order to provide this support, the WEB Server option has to be enabled in  
the Applications Setup dialog box (see Chapter 4 - Firewall Software, Applications).  
Once enabled, users can access the ProxyServer by entering its IP address in the destination  
field of their web browser. The following screen appears.  
Click on the word ‘login’ to log in to the ProxyServer configuration program. The Enter Network  
Password screen is displayed.  
Type supervisor in the User Name field (no password needed) and click OK. The Firewall  
Configuration screen is displayed.  
From this screen you can access all the configuration options. Refer to Chapter 4 - Firewall  
Software, for a description of the various options.  
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Chapter 6 - Warranty, Service and Tech Support  
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Dual Ethernet ProxyServer User Guide  
Introduction  
This chapter starts out with statements about your Dual Ethernet ProxyServer 2-year warranty.  
The next section, Tech Support, should be read carefully if you have questions or problems with  
your ProxyServer. It includes the technical support telephone numbers, space for recording your  
product information, and an explanation of how to send in your ProxyServer should you require  
service. The final three sections explain how to use our bulletin board service (BBS), and get  
support through CompuServe and the Internet.  
Limited Warranty  
Multi-Tech Systems, Inc. (“MTS”) warrants that its products will be free from defects in material or  
workmanship for a period of two years from the date of purchase, or if proof of purchase is not  
provided, two years from date of shipment. MTS MAKES NO OTHER WARRANTY,  
EXPRESSED OR IMPLIED, AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND  
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. This warranty does not  
apply to any products which have been damaged by lightning storms, water, or power surges or  
which have been neglected, altered, abused, used for a purpose other than the one for which  
they were manufactured, repaired by the customer or any party without MTS’s written  
authorization, or used in any manner inconsistent with MTS’s instructions.  
MTS’s entire obligation under this warranty shall be limited (at MTS’s option) to repair or  
replacement of any products which prove to be defective within the warranty period, or, at MTS’s  
option, issuance of a refund of the purchase price. Defective products must be returned by  
Customer to MTS’s factory transportation prepaid.  
MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES AND UNDER NO  
CIRCUMSTANCES WILL ITS LIABILITY EXCEED THE PURCHASE PRICE FOR DEFECTIVE  
PRODUCTS.  
On-line Warranty Registration  
To register your ProxyServer on-line, click on the following link:  
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Chapter 6 - Warranty, Service and Technical Support  
Tech Support  
Multi-Tech has an excellent staff of technical support personnel available to help you get the most  
out of your Multi-Tech product. If you have any questions about the operation of this unit, call 1-  
800-972-2439. Please fill out the ProxyServer information (below), and have it available when  
you call. If your ProxyServer requires service, the tech support specialist will guide you on how to  
send in your ProxyServer (refer to the next section).  
Recording ProxyServer Information  
Please fill in the following information on your Multi-Tech ProxyServer. This will help tech support  
in answering your questions. (The same information is requested on the Warranty Registration  
Card.)  
Model No.: _________________________  
Serial No.: _________________________  
Software Version: ____________________  
The model and serial numbers are on the bottom of your ProxyServer.  
Please note the type of external link device that is connected to your ProxyServer before calling  
tech support. Also, note the status of your ProxyServer including LED indicators, screen  
messages, diagnostic test results, DIP-Switch settings, problems with a specific application, etc.  
Use the space below to note the ProxyServer status:  
________________________________________________________________________________________________________  
________________________________________________________________________________________________________  
________________________________________________________________________________________________________  
________________________________________________________________________________________________________  
______________________________________________________________________________________________________________  
______________________________________________________________________________________________________  
______________________________________________________________________________________________________________  
______________________________________________________________________________________________________  
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Dual Ethernet ProxyServer User Guide  
Service  
If your tech support specialist decides that service is required, your ProxyServer may be sent  
(freight prepaid) to our factory. Return shipping charges will be paid by Multi-Tech Systems.  
Include the following with your ProxyServer:  
a description of the problem.  
return billing and return shipping addresses.  
contact name and phone number.  
check or purchase order number for payment if the ProxyServer is out of warranty. (Check  
with your technical support specialist for the standard repair charge for your ProxyServer).  
if possible, note the name of the technical support specialist with whom you spoke.  
If you need to inquire about the status of the returned product, be prepared to provide the serial  
number of the product sent.  
Send your ProxyServer to this address:  
MULTI-TECH SYSTEMS, INC.  
2205 WOODALE DRIVE  
MOUNDS VIEW, MINNESOTA 55112  
ATTN: SERVICE OR REPAIRS  
You should also check with the supplier of your ProxyServer on the availability of local service  
and/or loaner units in your part of the country.  
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Chapter 6 - Warranty, Service and Technical Support  
The Multi-Tech BBS  
For customers who do not have Internet access, Multi-Tech maintains a bulletin board system  
(BBS). Information available from the BBS includes new product information, product upgrade  
files, and problem-solving tips. The phone number for the Multi-Tech BBS is (800) 392-2432  
(USA and Canada) or (612) 785-3702 (international and local).  
The BBS can be accessed by any asynchronous modem operating at 1200 bps to 56K bps at a  
setting of 8 bits, no parity, and 1 stop bit (8-N-1).  
To Log on to the Multi-Tech BBS  
1.  
2.  
Set your communications program to 8-N-1.  
Dial our BBS at (800) 392-2432 (USA and Canada) or (612) 785-3702 (international and  
local).  
3.  
At the prompts, type your first name, last name, and password; then press ENTER. If  
you are a first time caller, the BBS asks if your name is spelled correctly. If you answer  
yes, a questionnaire appears. You must complete the questionnaire to use the BBS on  
your first call.  
4.  
Press ENTER until the Main Menu appears. From the Main Menu you have access to  
two areas: the Files Menu and News. For help on menu commands, type ?.  
To Download a File  
If you know the file name  
1.  
2.  
3.  
4.  
5.  
From the Main Menu, type F to access the Files Menu, then type D.  
Enter the name of the file you wish to download from the BBS.  
If a password is required, enter the password.  
Answer Y or N to the automatic logoff question.  
Select a file transfer protocol by typing the indicated letter, such as Z for Zmodem (the  
recommended protocol).  
6.  
If you select Zmodem, the transfer will begin automatically. If you select another protocol,  
you may have to initiate the transfer yourself. (In most data communications programs,  
the PAGE DOWN key initiates the download.)  
7.  
8.  
When the download is complete, press ENTER to return to the File Menu.  
To exit the BBS, type G and press ENTER.  
If you don’t know the file name  
1.  
From the Main Menu, type F to access the Files Menu. For a list of file areas, type L,  
press ENTER, then type L and press ENTER again. (If you do not type the second L,  
you will list all of the files on the BBS.)  
2.  
3.  
4.  
Mark each file area you would like to examine by typing its list number and pressing  
ENTER.  
Enter L to list all the files in the selected file areas. Enter C to go forward in the file list  
and P to go back.  
To mark one or more files for download, type M, press ENTER, type the list numbers of  
the files, and press ENTER again.  
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Dual Ethernet ProxyServer User Guide  
5.  
6.  
7.  
Enter D. You will see a list of the files you have marked. Enter E if you would like to edit  
the list; otherwise enter D again to start the download process.  
Select a file transfer protocol by typing the indicated letter, such as Z for Zmodem (the  
recommended protocol).  
If you select Zmodem, the file will transfer automatically. If you select another protocol,  
you may have to initiate the transfer yourself. (In most data communications programs,  
the PAGE DOWN key initiates the download.)  
8.  
9.  
When the download is complete, press ENTER to return to the File Menu.  
To exit the BBS, type G and press ENTER.  
About CompuServe  
In addition to the BBS, Multi-Tech provides support through CompuServe’s Modem Vendor  
Forum (GO MODEMVEN). Refer to your CompuServe documentation for special operating  
procedures.  
About the Internet  
Multi-Tech is a commercial user on the Internet, and we retrieve messages from our customers  
on a periodic basis. If you prefer to receive technical support via the Internet, you can contact  
Tech Support at the following address:  
Multi-Tech’s presence includes a Web site at:  
and an ftp site at:  
About the Multi-Tech Fax-Back Service  
Multi-Tech’s fax-back system provides 24-hour access to sales, marketing, and technical  
literature. Dial 612-717-5888, follow the voice prompts, and request document number 10 for a  
catalog of available documents. For convenience, have your fax number handy:  
_________________________. From the catalog of available documents, you can order  
newsletters, white papers, press releases, etc. from the sales and marketing index (pages 1-4),  
or order basic modem operation and troubleshooting guides from the technical support and  
engineering index. Just enter the applicable FB Doc. # from the left column of the catalog.  
54  
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Appendixes  
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Dual Ethernet ProxyServer User Guide  
Appendix A - TCP/IP (Transmission Control Protocol/  
Internet Protocol) Description  
TCP/IP is a protocol suite and related applications developed for the U.S. Department of Defense  
in the 1970s and 1980s specifically to permit different types of computers to communicate and  
exchange information with one another. TCP/IP is currently mandated as an official U.S.  
Department of Defense protocol and is also widely used in the UNIX community.  
Before you install TCP/IP on your network, you need to establish your Internet addressing  
strategy. First, choose a domain name for your company. A domain name is the unique Internet  
name, usually the name of your business, that identifies your company. For example, Multi-Tech’s  
domain name is multitech.com ( .com indicates this is a commercial organization; .edu denotes  
educational organizations, .gov denotes government organizations). Next, determine how many  
IP addresses you’ll need. This depends on how many individual network segments you have, and  
how many systems on each segment need to be connected to the Internet. You’ll need an IP  
address for each network interface on each computer and hardware device.  
IP addresses are 32 bits long and come in two types: network and host. Network addresses  
come in five classes: A, B, C, D, and E. Each class of network address is allocated a certain  
number of host addresses. For example, a class B network can have a maximum of 65,534  
hosts, while a class C network can have only 254. The class A and B addresses have been  
exhausted, and the class D and E addresses are reserved for special use. Consequently,  
companies now seeking an Internet connection are limited to class C addresses.  
Early IP implementations ran on hosts commonly interconnected by Ethernet local area networks  
(LAN). Every transmission on the LAN contains the local network, or medium access control  
(MAC), address of the source and destination nodes. The MAC address is 48-bits in length and is  
non-hierarchical; MAC addresses are never the same as IP addresses.  
When a host needs to send a datagram to another host on the same network, the sending  
application must know both the IP and MAC addresses of the intended receiver. Unfortunately,  
the IP process may not know the MAC address of the receiver. The Address Resolution Protocol  
(ARP), described in RFC 826 (http://info.internet.isi.edu:80/in-notes/rfc/files/rfc826.txt) provides a  
mechanism for a host to determine a receiver’s MAC address from the IP address. In the  
process, the host sends an ARP packet in a frame containing the MAC broadcast address; and  
then the ARP request advertises the destination IP address and asks for the associated MAC  
address. The station on the LAN that recognizes its own IP address will send an ARP response  
with its own MAC address. An ARP message is carried directly in an IP datagram.  
Other address resolution procedures have also been defined, including those which allow a  
diskless processor to determine its IP address from its MAC address (Reverse ARP, or RARP),  
provides a mapping between an IP address and a frame relay virtual circuit identifier (Inverse  
ARP, or InARP), and provides a mapping between an IP address and ATM virtual path/channel  
identifiers (ATMARP).  
The TCP/IP protocol suite comprises two protocols that correspond roughly to the OSI Transport  
and Session Layers; these protocols are called the Transmission Control Protocol and the User  
Datagram Protocol (UDP). Individual applications are referred to by a port identifier in TCP/UDP  
messages. The port identifier and IP address together form a “socket”. Well-known port numbers  
on the server side of a connection include 20 (FTP data transfer), 21 (FTP control), 23 (Telnet),  
25 (SMTP), 43 (whois), 70 (Gopher), 79 (finger), and 80 (HTTP).  
TCP, described in RFC 793 (http://info.internet.isi.edu:80/in-notes/rfc/files/rfc793.txt) provides a  
virtual circuit (connection-oriented) communication service across the network. TCP includes  
rules for formatting messages, establishing and terminating virtual circuits, sequencing, flow  
control, and error correction. Most of the applications in the TCP/IP suite operate over the  
“reliable” transport service provided by TCP.  
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Appendix A - TCP/IP Description  
UDP, described in RFC 768 (http://info.internet.isi.edu:80/in-notes/rfc/files/rfc768.txt) provides an  
end-to-end datagram (connectionless) service. Some applications, such as those that involve a  
simple query and response, are better suited to the datagram service of UDP because there is no  
time lost to virtual circuit establishment and termination. UDP’s primary function is to add a port  
number to the IP address to provide a socket for the application.  
The Application Layer protocols are examples of common TCP/IP applications and utilities, which  
include:  
Telnet (Telecommunication Network): a virtual terminal protocol allowing a user logged on to  
one TCP/IP host to access other hosts on the network, described in RFC 854 (http://  
FTP: the File Transfer Protocol allows a user to transfer files between local and remote host  
Archie: a utility that allows a user to search all registered anonymous FTP sites for files on a  
specified topic.  
Gopher: a tool that allows users to search through data repositories using a menu-driven,  
hierarchical interface, with links to other sites, per RFC 1436 (http://info.internet.isi.edu:80/in-  
SMTP: the Simple Mail Transfer Protocol is the standard protocol for the exchange of  
electronic mail over the Internet, per RFC 821 (http://info.internet.isi.edu:80/in-notes/rfc/files/  
HTTP: the Hypertext Transfer Protocol is the basis for exchange of information over the  
World Wide Web (WWW). Various versions of HTTP are in use over the Internet, with HTTP  
the most current.  
HTML: WWW pages are written in the Hypertext Markup Language (HTML), an ASCII-based,  
platform-independent formatting language, per RFC 1866 (http://info.internet.isi.edu:80/in-  
Finger: used to determine the status of other hosts and/or users, per RFC 1288 (http://  
POP: the Post Office Protocol defines a simple interface between a user’s mail reader  
software and an electronic mail server; the current version is POP3, described in RFC 1460  
DNS: the Domain Name System defines the structure of Internet names and their association  
with IP addresses, as well as the association of mail, name, and other servers with domains.  
SNMP: the Simple Network Management Protocol defines procedures and management  
information databases for managing TCP/IP-based network devices. SNMP, defined by RFC  
1157 (http://info.internet.isi.edu:80/in-notes/rfc/files/rfc1157.txt) is widely deployed in local and  
wide area network. SNMP Version 2 (SNMPv2), per RFC 1441 (http://info.internet.isi.edu:80/  
in-notes/rfc/files/rfc1441.txt) adds security mechanisms that are missing in SNMP, but is also  
more complex.  
Ping: a utility that allows a user at one system to determine the status of other hosts and the  
latency in getting a message to that host. Ping uses ICMP Echo messages.  
Whois/NICNAME: Utilities that search databases for information about Internet domain and  
domain contact information, per RFC 954 (http://info.internet.isi.edu:80/in-notes/rfc/files/  
Traceroute: a tool that displays the route that packets will take when traveling to a remote  
host.  
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Dual Ethernet ProxyServer User Guide  
Internet Protocol (IP)  
IP is the Internet standard protocol that tracks Internetwork node addresses, routes outgoing  
messages and recognizes incoming messages, allowing a message to cross multiple networks  
on the way to its final destination. The IPv6 Control Protocol (IPV6CP) is responsible for  
configuring, enabling, and disabling the IPv6 protocol modules on both ends of the point-to-point  
link. IPV6CP uses the same packet exchange mechanism as the Link Control Protocol (LCP).  
IPV6CP packets are not exchanged until PPP has reached the Network-Layer Protocol phase.  
IPV6CP packets received before this phase is reached are silently discarded. (See also TCP/IP.)  
Before you install TCP/IP on your network, you need to establish your Internet addressing  
strategy. You first choose a domain name for your company. A domain name is the unique  
Internet name, usually the name of your business, that identifies your company. For example,  
Multi-Tech’s domain name is multitech.com (where .com indicates this is a commercial  
organization; .edu denotes educational organizations, .gov denotes government organizations).  
Next, you determine how many IP addresses you’ll need. This depends on how many individual  
network segments you have, and how many systems on each segment need to be connected to  
the Internet. You need an IP address for each network interface on each computer and hardware  
device.  
IP addresses are 32 bits long and come in two types: network and host. Network addresses  
come in five classes: A, B, C, D, and E. Each class of network address is allocated a certain  
number of host addresses. For example, a class B network can have a maximum of 65,534  
hosts, while a class C network can have only 254. The class A and B addresses have been  
exhausted, and the class D and E addresses are reserved for special use. Consequently,  
companies now seeking an Internet connection are limited to class C addresses. The current  
demand for Internet connections will exhaust the current stock of 32-bit IP addresses. In  
response, Internet architects have proposed the next generation of IP addresses, Ipng (IP Next  
Generation). It will feature 16-byte addressing, surpassing the capacities of 32-bit IP. Still in its  
design phase, IPng is not expected to be widely deployed before late 1997.  
An IP address can serve only a single physical network. Therefore, if your organization has  
multiple physical networks, you must make them appear as one to external users. This is done  
via “subnetting”, a complex procedure best left to ISPs and others experienced in IP addressing.  
Since IP addresses and domain names have no inherent connection, they are mapped together  
in databases stored on Domain Name Servers (DNS). If you decide to let an Internet Service  
Provider (ISP) administer your DNS server, the ISP can assist you with the domain name and IP  
address assignment necessary to configure your company’s site-specific system information.  
Domain names and IP addresses are granted by the InterNIC. To check the availability of a  
specific name or to obtain more information, call the InterNIC at (703)742-4777, or visit the  
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Index  
F
Index  
Fax-Back Service ...............................................54  
Filtering...............................................................40  
Finger .................................................................57  
Firewall Configuration .........................................31  
Firewall Program Group .....................................29  
Firewall Software ................................................24  
Front Panel ...........................................................8  
LEDs .................................................................8  
FTP ....................................................................57  
A
About CompuServe ............................................54  
About the Internet ...............................................54  
About the Multi-Tech Fax-Back Service ..............54  
Adding Proxy Applications ..................................35  
Applications ........................................................39  
Archie .................................................................57  
G
B
Gopher ...............................................................57  
Back Panel ...........................................................9  
Connectors .......................................................9  
BBS ....................................................................53  
H
HTML .................................................................57  
HTTP ..................................................................57  
C
I
Cabinet Mounting Screw.....................................13  
Cabling Your ProxyServer ..................................14  
Changing IP Parameters ....................................32  
Changing WAN Port Parameters ........................34  
Command Connector ...........................................9  
CompuServe ......................................................54  
Configuration Port Setup ....................................29  
Connectors ...........................................................9  
10Base-T ..........................................................9  
Command .........................................................9  
Ethernet 1 and 2 ...............................................9  
Power ...............................................................9  
RS232/V.35 .......................................................9  
Internet ...............................................................54  
Internet Gateway Parameters .............................33  
Internet LAN Port Parameters ..................... 20, 32  
Internet Protocol .......................................... 56, 58  
Internet Services Network ....................................6  
IP ........................................................................58  
IP Parameters ....................................................32  
IP Port Configuration ..........................................20  
L
LEDs ....................................................................8  
ETHERNET 1 and 2..........................................8  
Fail ....................................................................8  
Power ...............................................................8  
WAN Link ..........................................................8  
Limited Warranty ................................................50  
Loading Your Software ......................................18  
D
Data Communications Equipment ........................9  
DCE. See Data Communications Equipment  
Default WAN Link Configuration .........................21  
DHCP Client ................................................ 20, 32  
DHCP Relay Agent ...................................... 20, 32  
DHCP Server......................................................36  
DNS....................................................................57  
Download Default Setup .....................................29  
Download Firmware Update ...............................30  
O
On-line Warranty Registration.............................50  
P
Ping ....................................................................57  
POP....................................................................57  
Power Connector..................................................9  
PPP/SLIP ...........................................................37  
Program Group...................................................29  
Proxy Applications ..............................................35  
E
Enabling PPP/SLIP.............................................37  
Enabling the DHCP Server .................................36  
Ethernet 1 and 2 Connectors ................................9  
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R
V
Remote Configuration .........................................42  
LAN-Based Procedure ....................................44  
Modem-Based Procedure ...............................42  
Remote Management .........................................46  
Telnet ..............................................................46  
WEB Management ..........................................48  
RS232/V.35 Connector .........................................9  
V.35 Shunt ..........................................................13  
V.35 Shunt Procedure .....................................13  
W
WAN Device Configuration .................................30  
WAN Port Parameters .......................... 20, 33, 34  
Warranty .............................................................50  
On-line Warranty Registration .........................50  
WEB Management .............................................48  
Whois/NICNAME ................................................57  
S
Safety Warnings .................................................12  
Secured LAN Port Parameters .................... 20, 32  
Service ...............................................................52  
Shunt Positions ..................................................13  
SMTP .................................................................57  
SNMP .................................................................57  
Software .............................................................24  
Applications ....................................................39  
Configuration Port Setup .................................29  
DHCP Server ..................................................36  
Download Default Setup .................................29  
Download Firmware Update............................30  
Filtering ...........................................................40  
Firewall Configuration .....................................31  
IP Parameters .................................................32  
Loading ...........................................................18  
PPP/SLIP........................................................37  
Program Group ...............................................29  
Proxy Applications...........................................35  
Statistics .........................................................39  
Uninstall Firewall Configuration .......................30  
WAN Device Configuration .............................30  
WAN Port Parameters ....................................34  
Specifications .....................................................10  
Statistics .............................................................39  
T
TCP/IP................................................................56  
Tech Support ......................................................51  
Technical Specifications .....................................10  
Telnet........................................................... 46, 57  
The Multi-Tech BBS ............................................53  
Traceroute ..........................................................57  
Transmission Control Protoco ............................56  
Typical Applications ............................................24  
Configuration 1 - Cable/DSL Modem...............24  
Configuration 2 - Existing Dual-LAN with Router26  
Configuration 3 - New Dual-LAN with T1 DSU 27  
U
Uninstall Firewall Configuration ..........................30  
Unpacking Your ProxyServer..............................12  
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