From owner-freebsd-net@FreeBSD.ORG Thu Jun 9 00:10:07 2005 Return-Path: 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 5AB7816A41C for ; Thu, 9 Jun 2005 00:10:07 +0000 (GMT) (envelope-from grog@lemis.com) Received: from blackwater.lemis.com (wantadilla.lemis.com [192.109.197.135]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9003843D1F for ; Thu, 9 Jun 2005 00:10:06 +0000 (GMT) (envelope-from grog@lemis.com) Received: by blackwater.lemis.com (Postfix, from userid 1004) id 86238856C6; Thu, 9 Jun 2005 09:40:04 +0930 (CST) Date: Thu, 9 Jun 2005 09:40:04 +0930 From: Greg 'groggy' Lehey To: Jeremie Le Hen Message-ID: <20050609001004.GB64194@wantadilla.lemis.com> References: <20050607100958.GU41050@obiwan.tataz.chchile.org> <20050607093717.GA76296@wantadilla.lemis.com> <20050607094848.GB16223@stack.nl> <20050607231218.GD64194@wantadilla.lemis.com> <20050608084946.GI41050@obiwan.tataz.chchile.org> <20050608095703.GM64194@wantadilla.lemis.com> <20050608195837.Q65103@Neo-Vortex.net> <20050608104053.GK41050@obiwan.tataz.chchile.org> <20050608233136.GX64194@wantadilla.lemis.com> <20050608234559.GS41050@obiwan.tataz.chchile.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="lUWNHpMBvmChTRKs" Content-Disposition: inline In-Reply-To: <20050608234559.GS41050@obiwan.tataz.chchile.org> User-Agent: Mutt/1.4.2.1i Organization: The FreeBSD Project Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.FreeBSD.org/ X-PGP-Fingerprint: 9A1B 8202 BCCE B846 F92F 09AC 22E6 F290 507A 4223 Cc: Marc Olzheim , FreeBSD-net@freebsd.org, Neo-Vortex Subject: Re: Problems with gif tunnels X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 09 Jun 2005 00:10:07 -0000 --lUWNHpMBvmChTRKs Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thursday, 9 June 2005 at 1:46:00 +0200, Jeremie Le Hen wrote: > Greg, > >> My understanding is that GRE is to IP as PPP is to SLIP: it allows >> multiple protocols to be encapsulated. I've done some tracing with >> Ethereal, and the only difference is a four-byte header in front of >> the payload for GRE; in an IP tunnel, it's simply missing. I've >> written this up in my diary >> (http://www.lemis.com/grog/diary-jun2005.html#8), along with the >> traces. > > yes it's usually a simple four-byte header when doing a simple tunnel. > But from what I have read [1] and according to what Giorgos said, > it seems it can be a lot more longer, depending on the value of the > five first bits of the GRE header. Ah, that seems reasonable. =20 Greg -- The virus contained in this message was not detected. Finger grog@FreeBSD.org for PGP public key. See complete headers for address and phone numbers. --lUWNHpMBvmChTRKs Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQFCp4jcIubykFB6QiMRAswaAJ45MEqco5cqsqwMaWaQECsvpqsMhgCgofKb 1nIXTVo6qr4XMLHFJNN+NGM= =AxVZ -----END PGP SIGNATURE----- --lUWNHpMBvmChTRKs--