Great Circle Associates Firewalls
(July 1997)
 

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Subject: Re: Faking IPaddresses
From: Bernd Eckenfels <lists @ lina . inka . de>
Date: Thu, 10 Jul 1997 21:43:05 +0200
To: "David A. Baldwin" <daveyb @ bigdipper . iagi . net>
Cc: firewalls @ greatcircle . com
In-reply-to: <Pine . NEB . 3 . 95 . 970710130742 . 16727A-100000 @ bigdipper . iagi . net>; from David A. Baldwin on Thu, Jul 10, 1997 at 01:22:30PM -0400
References: <Pine . NEB . 3 . 95 . 970710130742 . 16727A-100000 @ bigdipper . iagi . net>

Hello,


On Jul 10, David A. Baldwin wrote
> However, I may have a client with a labtop set up to use IPaddress
> 128.8.10.5 and another client with a labtop set up to use IPaddress
> 10.1.1.130 and I want to be able to plug them into the same ethernet HUB
> and have that HUB plugged into my internet router, and have them both use
> the internet seemlessly. 

You can use a dedicated Interface on a Linux BOX. On this interface the
Linux Box will Proxy Arp for all Addresses. At the first incoming package
Linux will assign a route to its source address with a little script arount
tcpdump. With the IP-Masquerade Feature assigned to all incoming pacjets on
this gues port you are done. Expire the routes to the source after a day,
and its possible to plug in even multiple hosts.

Greetings
Bernd
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References:
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