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Date: Sun, 14 Nov 2004 14:14:29 -0800
From: Julian Elischer <julian@elischer.org>
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To: "Jacob S. Barrett" <jbarrett@amduat.net>
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cc: freebsd-net@freebsd.org
Subject: Re: Universal Client Gateway
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Jacob S. Barrett wrote:
> I am trying to make what some call a universal client gateway.  Finding 
> anything via google on the subject is turning up nothing.  Basically I want 
> setup a gateway that will masquerade IP from any host reguardless of its IP 
> configuration.  For example if a host is configured with IP 192.168.2.2 and a 
> gateway of 192.168.2.1 my gateway would reply to ARP requests for 
> 192.168.2.1.  When the host forwards its IP traffic to me I would masquerade 
> the packet with my IP and forward it.  When the reply comes back my gateway 
> would de-masquerade the packet and forward it back the host.  I have it all 
> working except for the return forwarding.
> 

[...]


> 
> So does anyone understand what I am trying to do?  Do you know how to do it?  
> Am I going about this all wrong?
> 

sounds like you just want to run natd.