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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.
MTPSR1-120 Firewall
IP Address 192.168.0.101
Mask 255.255.255.0
Internet
Novell Server
IP Address
192.168.0.102
Windows NT Server
IP Address
192.168.0.103
Mail Server
IP Address
192.168.0.104
Workstation
IP Address
192.168.0.105
Workstation
IP Address
192.168.0.106
Workstation
IP Address
192.168.0.107
HUB
TM
TM
LAN 1
Private
LAN 2
Public
Private LAN
Cable/DSL
Modem
Figure 4-1. Cable/DSL Modem Configuration