From owner-freebsd-net@FreeBSD.ORG  Fri Jul 18 03:05:09 2003
Return-Path: <owner-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 D7ACA37B401
	for <net@freebsd.org>; Fri, 18 Jul 2003 03:05:09 -0700 (PDT)
Received: from exchange.wan.no (exchange.wan.no [80.86.128.88])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 9750243F93
	for <net@freebsd.org>; Fri, 18 Jul 2003 03:05:08 -0700 (PDT)
	(envelope-from sten.daniel.sorsdal@wan.no)
content-class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
X-MimeOLE: Produced By Microsoft Exchange V6.0.6249.0
Date: Fri, 18 Jul 2003 12:03:43 +0200
Message-ID: <0AF1BBDF1218F14E9B4CCE414744E70F1F3DF4@exchange.wanglobal.net>
X-MS-Has-Attach: 
X-MS-TNEF-Correlator: 
Thread-Topic: NAT and PPTP
Thread-Index: AcNMmo3QJfAOFMqlRG2kR9U0vBGG/wAeQXUA
From: =?iso-8859-1?Q?Sten_Daniel_S=F8rsdal?= <sten.daniel.sorsdal@wan.no>
To: "Brett Glass" <brett@lariat.org>, <net@freebsd.org>
Subject: RE: NAT and PPTP
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.1
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: Fri, 18 Jul 2003 10:05:10 -0000

=20
> FreeBSD makes a very good NAT router... for most applications.
> But a client of mine is having terrible trouble with it when
> trying to use NAT with one particular protocol: PPTP.
>=20
> Here's what's going on. A client has a FreeBSD box that's serving as a
> NAT router. He has one public IP, and lots of PCs behind the router on
> unregistered IPs. This works fine when they're doing=20
> browsing, etc., but
> fails horribly when users try to use PPTP to tunnel out into=20
> another LAN
> across the Internet.
>=20

natd handles pptp. we have multiple clients who are NATed and they =
connect
to different pptp gateways (occasionally the same too).

if you are running a poptop pptp server and you want multiple clients=20
connecting to this one pptp server; make sure you get the GRE ID update
(poptop always sets the id to 0 - messes up two connections).

make sure you divert gre packets on their way out as well.

- sten