Home network routing setup

From: Shawn T. Rutledge <rutledge_at_cx47646-a.phnx1.az.home.com>
Date: Wed Apr 12 23:54:26 2000

On Wed, Apr 12, 2000 at 10:38:12PM -0500, Eros, Anthony wrote:
> I'd like to set up more of my systems in a home network environment, but I
> don't really properly understand routing and am looking for some help.
> My internet access is through a cable modem that acts as a DHCP server,
> allocating up to three IP addresses to specifically-named systems. For
> instance systems "foo1", "foo2" and "foo3" will get IP addresses from the
> modem, while "foo4", "foo5" and "foo6" will not.
> I thought about snagging a small PC with a couple of NICs and running
> ShareTheNet or WinGate, but I recently picked up a used Alpha running NT
> with a pair of NICs that I'd like to try out as a router. Right now, the
> Alpha has one of the magic system names (foo1), so one of the network
> adapters gets a DHCP-served IP address. I have the other adapter's IP
> address defined as, with the mask as and no
> gateway defined.
> I want to set the following systems up with static IP addresses:
> SGI Indy
> Symbolics Lisp Machine
> NeXT Cube
> Pentium II Laptop
> Pentium Desktop
> DEC Shark
> iOpener
> I'd like to set up these machines to use as their gateway.
> Seems to me that if I have the Alpha set up properly, I shouldn't need to do
> any special route definitions on the other systems, right?
> So, any suggestions on how I should set up the two NICs on the Alpha under
> NT 4.0?

May be possible with NT but this is screaming for Linux... what you need
is IP masquerading, which will let all the machines hide behind one IP
address, that of the gateway machine. It will let all the machines on the
whole LAN access the Internet, but they won't have real Internet IP
addresses. You could also use the two remaining IP addresses on two
other machines, to expose them directly to the Internet, in case you want
to run services on them. I've been doing this for 4 or 5 years, it
works great. And it's just one excuse among many to get into Linux if
you haven't already... with a NeXT and an Indy evidently you aren't Unix-
phobic, so should have no trouble... There are a couple of good howto's
on the 'net about routing and masquerading respectively. You can install
Linux on the alpha machine or just get another 386 or 486 for that purpose.

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Received on Wed Apr 12 2000 - 23:54:26 BST

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