From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrea Rossato <mailing_list@istitutocolli.org>
Subject: Re: how to forward packets to another gateway, if i'm one
Date: Tue, 17 Dec 2002 17:07:09 +0100
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Saulius Menkevicius wrote:
>   Now, I want to make some traffic that comes from some client and 
> that should go through gateway 10.0.0.1 to be forwarded to 10.0.0.2 
> (without any changes). The need is to make the forwarding transparent 
> to both 10.0.0.2 and the client.

in 10.0.0.1

ip rule add from YOUR_CLIENT [to DESTINATION] table fbsd.out
ip route add default via 10.0.0.2 dev $DEV table fbsd.out

I think this should do the job (for more information http://lartc.org/)
you create a routing table (fbsd.out) that will use 10.0.0.2 as gateaway 
for packets comming from your client.

I did not test this config, since I'm marking packets in the FORWARD 
chain of the mangle table and use
ip rule add fwmark to route them.

hope this helps.
andrea