From owner-freebsd-ipfw@FreeBSD.ORG  Wed Oct 26 04:46:42 2011
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Date: Wed, 26 Oct 2011 08:46:38 +0400
From: "Andrey V. Elsukov" <bu7cher@yandex.ru>
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Cc: freebsd-ipfw@freebsd.org
Subject: Re: ipfw features
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On 25.10.2011 17:19, Серега Гончаров wrote:
> Hi all. Is there some plans to make ipfw can change ip header fields of
> going throught packets, like TTL, DF flag etc. pf and iptables can, so maybe
> in freebsd 9 it will be implemented? thanks.

You can use ng_patch(4) for that.

-- 
WBR, Andrey V. Elsukov