Date: Thu, 9 Jun 2005 01:46:00 +0200 From: Jeremie Le Hen <jeremie@le-hen.org> To: Greg 'groggy' Lehey <grog@FreeBSD.org> Cc: Marc Olzheim <marcolz@stack.nl>, FreeBSD-net@freebsd.org, Jeremie Le Hen <jeremie@le-hen.org>, Neo-Vortex <root@Neo-Vortex.net> Subject: Re: Problems with gif tunnels Message-ID: <20050608234559.GS41050@obiwan.tataz.chchile.org> In-Reply-To: <20050608233136.GX64194@wantadilla.lemis.com> References: <20050607093717.GA76296@wantadilla.lemis.com> <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>
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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. Enjoy your tunnel ;-). [1] http://www.networksorcery.com/enp/protocol/gre.htm -- Jeremie Le Hen < jeremie at le-hen dot org >< ttz at chchile dot org >
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