From owner-freebsd-hackers Thu Mar 19 16:41:53 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id QAA10754 for freebsd-hackers-outgoing; Thu, 19 Mar 1998 16:41:53 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from whistle.com (s205m131.whistle.com [207.76.205.131]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id QAA10708 for ; Thu, 19 Mar 1998 16:41:31 -0800 (PST) (envelope-from archie@whistle.com) Received: (from smap@localhost) by whistle.com (8.7.5/8.6.12) id QAA10159; Thu, 19 Mar 1998 16:40:22 -0800 (PST) Received: from bubba.whistle.com(207.76.205.7) by whistle.com via smap (V1.3) id sma010155; Thu Mar 19 16:40:20 1998 Received: (from archie@localhost) by bubba.whistle.com (8.8.7/8.6.12) id QAA06132; Thu, 19 Mar 1998 16:40:05 -0800 (PST) From: Archie Cobbs Message-Id: <199803200040.QAA06132@bubba.whistle.com> Subject: Re: Natd Support for Microsoft PPTP / VPN using protocol 47 In-Reply-To: <19980319012952.45187@follo.net> from Eivind Eklund at "Mar 19, 98 01:29:52 am" To: eivind@yes.no (Eivind Eklund) Date: Thu, 19 Mar 1998 16:40:05 -0800 (PST) Cc: jeff@netronix.com, freebsd-hackers@FreeBSD.ORG, grog@lemis.com X-Mailer: ELM [version 2.4ME+ PL31 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Eivind Eklund writes: > On Wed, Mar 18, 1998 at 04:26:55PM +0000, Jeff Buseman wrote: > > Finally, my question(s) is this: Is there some way to make NATd do > > the translation on this protocol, or does it only handle TCP and UDP > > traffic? > > It only handle TCP and UDP traffic. The only way to get it to handle > something else is by asking Charles or me to make libalias do so, preferably > with pointer to suitable documentation. I might find time to handle this > fairly quickly if you come up with docs. This would be pretty easy. Proto 47 is GRE [1, 2] and is used by PPTP [3]. Each packet has a two byte "Call ID" parameter you could use to multiplex the translated packets. -Archie References: [1] http://www.es.net/pub/rfcs/rfc1701.txt [2] http://www.es.net/pub/rfcs/rfc1702.txt [3] ftp://ietf.org/internet-drafts/draft-ietf-pppext-pptp-02.txt ___________________________________________________________________________ Archie Cobbs * Whistle Communications, Inc. * http://www.whistle.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message