Date: Thu, 9 Jun 2005 09:40:04 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Jeremie Le Hen <jeremie@le-hen.org> Cc: Marc Olzheim <marcolz@stack.nl>, FreeBSD-net@freebsd.org, Neo-Vortex <root@Neo-Vortex.net> Subject: Re: Problems with gif tunnels Message-ID: <20050609001004.GB64194@wantadilla.lemis.com> In-Reply-To: <20050608234559.GS41050@obiwan.tataz.chchile.org> 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>
next in thread | previous in thread | raw e-mail | index | archive | help
--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--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050609001004.GB64194>