Compatible Systems 1250I Chapter 1

Chapter1 - Introduction 1

Chapter 1 - Introduction

Congratulationson your purchase of the MicroRouter 1250i multiport

wide arear outer with integrated Fractional/Full T1 CSU/DSU. The

MicroRouter 1250i supports the IP and IPX network protocols, wit h

leased-lineand/or dial-on-demand operation using the PPP, Frame

Relay and/or SMDS wide area protocols.

TheMicroRouter 1250i can be configured to be a very effective packet

screeningfirewall. However, you must carefully set up your network

and addp acketfilters in order for it to be effective in this role.

THE SHIPPING CONFIGURATIONIN YOUR MICROROUTER

1250iDO ES NOT PROVIDEAU TOMATICFIREWALL PROTEC-

TION. YOU MUST FIRST PROGRAM Y OURR OUTER TOWOR K

INTHIS R OLE ON YOUR NETWORK.

Note: Due to the natureof the IP protocol, IP packet filtering can

beq uite complicated. If you are attempting to design and implement a

comprehensiveset of filters, or an Internet Firewall, there are a number

ofreferences you should consult. Two good startingpoints are:

Building Internet Firewalls,by Brent Chapman, O’Reilly and

Associates,1995, and Firewalls and Internet Security: Repelling the

WilyHacker, by William R. Cheswick and Steven M. Bellovin,

Addison-WesleyPublishing Company,1994.

TheMicroRouter 1250i can be configured to provide cost effective

on-demandconnections over a wide area communications link (typi-

cally a voice phone line, a switched 56 line, or an ISDN line). Your

network traffican dt heco nfiguration you place in the router will deter-

minehow often and for how long such a link is connected.

THE SHIPPING CONFIGURATIONIN YOUR MICROROUTER

1250iDO ES NOT PROVIDE AUTOMATICON-DEMAND INTER-

NETWORKING. YOU MUST FIRST PROGRAM YOUR ROUTER

TOWORK IN THIS ROLE ON YOUR NETWORK.