From owner-freebsd-net@FreeBSD.ORG  Mon Apr 17 19:35:10 2006
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
X-Original-To: freebsd-net@freebsd.org
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 0761216A401
	for <freebsd-net@freebsd.org>; Mon, 17 Apr 2006 19:35:10 +0000 (UTC)
	(envelope-from bzeeb-lists@lists.zabbadoz.net)
Received: from transport.cksoft.de (transport.cksoft.de [62.111.66.27])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 6870C43D46
	for <freebsd-net@freebsd.org>; Mon, 17 Apr 2006 19:35:09 +0000 (GMT)
	(envelope-from bzeeb-lists@lists.zabbadoz.net)
Received: from transport.cksoft.de (localhost [127.0.0.1])
	by transport.cksoft.de (Postfix) with ESMTP
	id 65DF620013F; Mon, 17 Apr 2006 21:35:08 +0200 (CEST)
Received: by transport.cksoft.de (Postfix, from userid 66)
	id A16A0200116; Mon, 17 Apr 2006 21:35:05 +0200 (CEST)
Received: from maildrop.int.zabbadoz.net (maildrop.int.zabbadoz.net
	[10.111.66.10])
	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(No client certificate requested)
	by mail.int.zabbadoz.net (Postfix) with ESMTP id EDA19444F41;
	Mon, 17 Apr 2006 19:34:11 +0000 (UTC)
Date: Mon, 17 Apr 2006 19:34:11 +0000 (UTC)
From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
X-X-Sender: bz@maildrop.int.zabbadoz.net
To: Kelly Yancey <kbyanc@posi.net>
In-Reply-To: <20060413155210.R73176@gateway.posi.net>
Message-ID: <20060417192638.U13011@maildrop.int.zabbadoz.net>
References: <442D8E98.6050903@vineyard.net> <20060331222813.GA29047@zen.inc>
	<20060331223613.GD80492@spc.org>
	<20060402130227.G99958@atlantis.atlantis.dp.ua>
	<20060402113516.D76259@maildrop.int.zabbadoz.net>
	<20060402151039.R51461@atlantis.atlantis.dp.ua>
	<20060411153224.L55107@gateway.posi.net>
	<20060411213528.F13011@maildrop.int.zabbadoz.net>
	<20060413155210.R73176@gateway.posi.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
X-Virus-Scanned: by AMaViS cksoft-s20020300-20031204bz on transport.cksoft.de
Cc: freebsd-net@freebsd.org
Subject: Re: tcpdump and ipsec
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 17 Apr 2006 19:35:11 -0000

On Thu, 13 Apr 2006, Kelly Yancey wrote:

> I'm curious: how are you performing NAT on your tunnelled traffic?

the answer is simple: do not NAT on the ipsec interface though it's
not fully correct because I do even NAT traffic that goes like:

A ---- lan1(ipsec only) --- gw(NAT) --- lan2(ipsec only) ---- B

[ipsec only == esp and ike allowed]

so the better explanation perhaps is:
do not nat on the ipsec interface of the outgoing direction.

-- 
Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT