From owner-freebsd-net@FreeBSD.ORG  Thu Apr 21 17:21:04 2005
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Date: Thu, 21 Apr 2005 13:20:58 -0400
From: Karim Fodil-Lemelin <kfl@xiphos.ca>
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Subject: ipfw fwd to localhost
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Hi,

    I just did a cvsup of RELENG_5 and got some problem doing forwarding 
to localhost using a rule like this:

ipfw add fwd 127.0.0.1,1234 tcp from any to any in via re1

    I have those options in my kernel config:

options   IPFIREWALL
options   IPFIREWALL_FORWARD_EXTENDED
options   IPFIREWALL_DEFAULT_TO_ACCEPT

    I understand that 5.4 is using ipfw2 by default so I did not add 
IPFW2="YES" in /etc/make.conf and used the ipfw that I had installed 
with 5.3.

The error I get is somehting like setsockopt (IP_FW_ADD) invalid 
argument when issuing the ipfw call.

Anybody has encountered this problem?

Karim.