From owner-freebsd-ipfw@FreeBSD.ORG  Tue Oct 18 07:36:17 2005
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Date: Tue, 18 Oct 2005 11:36:13 +0400
From: "Andrey V. Elsukov" <bu7cher@yandex.ru>
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To: Alessandro Parrinello <parrinello_alessandro@yahoo.it>
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Cc: ipfw@freebsd.org
Subject: Re: Dynamically adding ipfw & natd rule
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Alessandro Parrinello wrote:
> Hi, i need to change the natting rules of natd by a c
> program dynamically based on information gived me by a
> server. How can i do this? 

If you speak about an ipfw divert rules, then you can see the sbin/ipfw 
source code as example.

-- 
WBR, Andrey V. Elsukov