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How to Share a Cable MODEM With Windows 98 Second Edition - Preliminary Work
Last updated: 10/11/00

PRELIMINARY WORK. This article builds on two previous articles written for the Digest and assumes the reader will have reviewed them and, if need be, will refer to them.

It also assumes:

1.  You have an operating Windows 95/98 LAN.  Don't worry about the protocol for now; just be sure it works.

2.  You have a PC with Windows 98 SE installed and it is interfaced to operational external cable MODEM.  This PC will have two Network Interface Cards (NICs) or adapters installed.  One (NIC1 in the diagram above) is for is for the local area network  and the other (NIC2) is for the external CM.  (If anyone can figure-out how to do this with one adapter, I'd appreciate an E-Mail.)  The network equipment in ICS Gateway computer I configured consisted of:

This PC is attached to two networks: the LAN and the Internet (that cloud depicted above actually lowers (like fog) to include the ICS gateway PC when the PC is connected to the Internet; i.e., it becomes a host computer on the Internet like any other computer on the Internet).  These two networks cannot "talk" to each other directly.  Again, ICS becomes a gateway between.

ICS will not work with an Internal, one-way CM, which must rely on a separate dial-up MODEM and dial-up adapter software for upstream traffic. That is, ICS cannot "talk" to more than on entity on the Internet side of the gateway.

An external CM (with an integral dial-up MODEM on a one-way cable) is connected to a PC with a network card.  In this case, ICS works because it "talks" to a single Internet entity, the network adapter.  The network adapter is actually assigned an Internet IP address by the ISP's DHCP server acting through the CM.   During installation, ICS assigns a static IP address ( to the network adapter on the LAN and after installation the ICS DHCP component assigns/leases additional IP addresses to client computers on the LAN (,, etc.).  One NIC is on the Internet, the other is on the LAN, and ICS is the go between.

IP addresses 192.168.0.XXX are block of 256 class C network numbers which the Internet Assigned Numbers Authority (IANA) reserved for private internets per RFC 1918 (Address Allocation for Private Internets) they used with subnet mask (more Greek, huh?).  These addresses may not be used directly on the Internet.

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Copyright, Disclaimer, and Trademark Information Copyright © 1996-2006 Larry F. Byard.  All rights reserved. This material or parts thereof may not be copied, published, put on the Internet, rewritten, or redistributed without explicit, written permission from the author.