From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jesse Gordon" <jesseg@nikola.com>
Subject: Unmatchable packet?
Date: Tue, 22 Nov 2005 12:58:20 -0800
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To: netfilter <netfilter@lists.netfilter.org>

My box is running a TCP service. When another box tries to my box, my box 
responds with a reply packet.(Just like it should.)
 How do I match that (and all subsequent) reply packets so I can SNAT on 
them?

I even tried:

iptables -t nat -A POSTROUTING -o eth1 -j SNAT --to 222.222.222.222

and sure enough, everything going out eth1 was 'from' 222.222.222.222 except 
the reply packets to incoming connections.

Also tried -t nat OUTPUT, -t mangle OUTPUT, etc.. Nothing seemed to work.

Should I expect such a feat to be possible?

Thanks!

-Jesse