From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pascal Hambourg <pascal.mail@plouf.fr.eu.org>
Subject: Re: Iptables proxy to a different network
Date: Fri, 09 Feb 2007 18:01:00 +0100
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References: <D392D4803D14354CBC49D772E19DD0CD45660A@zeus.w2k.nrlmry.navy.mil>	<45CC5A91.4090200@plouf.fr.eu.org><Pine.LNX.4.61.0702091338030.31955@yvahk01.tjqt.qr>	<45CC919C.7030104@plouf.fr.eu.org>
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Andrus, Mr. Brian (Contractor) a =E9crit :
>=20
> So to properly do this, I _must_ SNAT the connection

It is a possibility.

> and route them back from system C via system B?

"Or", not "and". If you SNAT, the return traffic will be routed properly.

> Diagram:
>=20
> +---------------+
> |   System A    |
> +-------+-------+
>         |
> {=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D}
> {    Internet   }
> {=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D}
>         |
> +---------------+        +---A.B.C.x-----+
> |    Router     +--------|   System B    +
> +-------+-------+        +---------------+
>         |
> +-------+-------+
> |   System C    |
> +---X.Y.Z.x-----+

This is getting complicated...
In your first message, you said that A (the proxy) was a.b.c.1 and  B=20
(the server) was x.y.z.1.
In this diagram, where are the client, the proxy and the server ?