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Date: Thu, 14 Jul 2005 10:37:04 +0400
From: Alex Povolotsky <tarkhil@webmail.sub.ru>
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To: compunction <compunction@gmail.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: GRE and PF problem
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compunction wrote:

>GRE needs to pass bidirectional.  You will need a binat to make it
>work.  I have not found a firewall that will allow GRE to work with a
>many to one nat.
>  
>

The most painful thing is that pf's nat works for GRE - SOMETIMES :-(

The only thing firewall needs to implement for natting GRE is creation 
of two rules (forward and back) for GRE packet, just like it does for ICMP.

I'm not a firewall writer, but as far as I understand general procedural 
programming, it cannot be THAT complicated.

Alex.