From owner-freebsd-net@FreeBSD.ORG  Tue Nov 29 13:07:31 2005
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Date: Tue, 29 Nov 2005 13:07:27 +0000
From: Brian Candler <B.Candler@pobox.com>
To: asko <asko_nospam@ultrasoft.ee>
Message-ID: <20051129130727.GA40492@uk.tiscali.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: natd redirected ports from LAN
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On Tue, Nov 29, 2005 at 12:46:10PM +0200, asko wrote:
> I'm searching for a better, faster solution.. 
> Does it exist?

Do your constraints allow you switch to 'pf' instead of 'ipfw'? I think you
may be able to do it that way. I had a similar situation where I wanted
traffic originating from the local host to be processed specially. The case
in point was redirection rather than NAT, but the same principles probably
apply. Using pf I forced the traffic back through the loopback interface so
it was treated as 'incoming' traffic. e.g. see thread around
http://lists.freebsd.org/pipermail/freebsd-pf/2005-September/001495.html

Maybe in your case you just need two rdr rules: one bound to the internal
interface, and one to the external one.

I stopped using ipfw several years ago because of a number of issues with
NAT, especially some horrible scenarios with multiple external interfaces,
IPSEC tunnels, and needing to run multiple instances of natd :-{

Regards,

Brian.