From mboxrd@z Thu Jan  1 00:00:00 1970
From: sven@hin.de
Subject: Re: Change outbound ICMP source
Date: Tue, 11 Apr 2006 00:12:33 +0200
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To: nathaniel.d.hall@gmail.com
Cc: netfilter@lists.netfilter.org

> That doesn't achieve what I want.  If a TCP connection is rejected at
> the firewall, then blocking ICMP at the upstream router will block the
> host-unreachable from going out, not make it seem as if the router is
> the source.

You want to do SNAT?