Date: Wed, 8 Jun 2005 12:40:53 +0200 From: Jeremie Le Hen <jeremie@le-hen.org> To: Neo-Vortex <root@Neo-Vortex.net> Cc: Greg 'groggy' Lehey <grog@freebsd.org>, Marc Olzheim <marcolz@stack.nl>, Jeremie Le Hen <jeremie@le-hen.org>, FreeBSD-net@freebsd.org Subject: Re: Problems with gif tunnels Message-ID: <20050608104053.GK41050@obiwan.tataz.chchile.org> In-Reply-To: <20050608195837.Q65103@Neo-Vortex.net> 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>
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> > It's currently pushing 7:30 pm, and I was going to send out a reply
> > tomorrow. But indeed, it seems that Linux people prefer GRE tunnels,
> > we prefer (with good reason) IP tunnels, and the whole issue was one
> > of documentation. After changing my tunnel from GRE to IP, it worked
> > (and works) like a charm.
IIRC,
- Linux uses the ipip module to do IP-over-IP tunnel
- FreeBSD uses the gre(4) interface to do GRE tunnels
- GRE is a Cisco product and means ``Generic Routing
Encapsulation''. I don't know what they mean with the term
"Generic" because I have only seen IP encapsulated tunnel so far.
According to the GRE header, I guess GRE is far more powerful
than a simple IP-over-IP encapsulation, and I would be glad if
someone could explain us what are the benefits of this protocol.
I would conclude by saying that indeed Linux users tend to use
GRE tunnels whereas a IP-over-IP tunnel would be enough, because
they used to be trendy.
> What is the difference between gre and gif tunnels anyway... the man mages
> were not that informative...
Read above. Usually gre(4) tunnels are used as simple IP-over-IP tunnel,
so a gif(4) would do the same with less overload (due to GRE header size).
GRE seems far more powerful, but I don't know its benefits.
Regards,
--
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >
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