Multitech PROXYSERVER MTPSR1-120 User's Guide Page 26

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Firewall User Guide
Introduction
This chapter describes the software used in the Firewall. It begins with the description of three
typical applications for the Firewall. 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 Firewall. 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 Firewall to connect your Secured (private) LAN to the
Internet using a cable or Digital Subscriber Line (DSL) modem, providing high speed Internet
access. The second application ties your Secured (private) LAN and Internet (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 Firewall to connect to the Internet.
Configuration 1 - Cable/DSL Modem
In the configuration shown in Figure 4-1, the Firewall is connected to the Secured (private) LAN
via the LAN 1 connection of the back of the unit. 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 Firewall.
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
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