From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nathaniel Hall <nathaniel.d.hall@gmail.com>
Subject: Change outbound ICMP source
Date: Mon, 10 Apr 2006 13:02:12 -0500
Message-ID: <443A9DA4.30801@gmail.com>
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I have been trying to figure out how to change the source IP address of 
an ICMP packet that originates from the firewall.  Here is my application.

Instead of dropping a packet I reject it with ICMP host unreachable 
messages.  I would like to make it appear that the firewall isn't there, 
so I would like to change the source IP address to be that of our 
upstream router.  How would I go about doing this?

-- 
Nathaniel Hall, GSEC GCFW GCIA