From owner-freebsd-net@FreeBSD.ORG  Fri Jan 20 21:53:38 2006
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Date: Fri, 20 Jan 2006 21:53:33 +0000
From: Brian Candler <B.Candler@pobox.com>
To: Alexey Popov <llp@iteranet.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: IPSEC documentation
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> On Thu, Dec 29, 2005 at 09:50:47AM +0300, Alexey Popov wrote:
> > If we would also have NAT-T support, FreeBSD would be the best choice 
> > of VPN concentrator.

I just saw this patch posted on the ipsec-tools-devel list:
http://ipsec-tools.sf.net/freebsd6-natt.diff

It's for FreeBSD 6 but also seems to apply cleanly to 5.4, apart from one
file which I think needs this instead:

--- ./netinet/in_proto.c.orig	Mon Mar 21 16:05:35 2005
+++ ./netinet/in_proto.c	Fri Jan 20 21:41:59 2006
@@ -108,7 +108,7 @@
   &nousrreqs
 },
 { SOCK_DGRAM,	&inetdomain,	IPPROTO_UDP,	PR_ATOMIC|PR_ADDR,
-  udp_input,	0,		udp_ctlinput,	ip_ctloutput,
+  udp_input,	0,		udp_ctlinput,	udp_ctloutput,
   0,
   udp_init,	0,		0,		0,
   &udp_usrreqs

Haven't tested it yet - just waiting for kernel to recompile :-)

Regards,

Brian.