Multitech MTPSR1-120 manual Typical Applications, Configuration 1 - Cable/DSL Modem, Introduction

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

NovellTM Server

IP Address 192.168.0.102

Windows NT TM Server IP Address

192.168.0.103

Mail Server	Workstation
IP Address	IP Address
192.168.0.104	192.168.0.105

Private LAN

Workstation IP Address 192.168.0.107

Workstation IP Address 192.168.0.106

Figure 4-1. Cable/DSL Modem Configuration

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