From mboxrd@z Thu Jan  1 00:00:00 1970
From: Neels Hofmeyr <nhofmeyr@sysmocom.de>
Subject: Re: [PATCH net-next v3 1/8] gtp: add documentation
Date: Tue, 21 Feb 2017 02:12:45 +0100
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References: <20170213153624.14170-1-aschultz@tpip.net>
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 <20170220161552.tnewzagg4z4azikd@nataraja>
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Cc: laforge <laforge@gnumonks.org>, Jonas Bonn <jonas@southpole.se>,
        netdev <netdev@vger.kernel.org>,
        osmocom-net-gprs <osmocom-net-gprs@lists.osmocom.org>,
        Lionel Gauthier <Lionel.Gauthier@eurecom.fr>,
        pablo <pablo@netfilter.org>
To: Andreas Schultz <aschultz@tpip.net>
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On Mon, Feb 20, 2017 at 06:28:07PM +0100, Andreas Schultz wrote:
> >> +A specific tunnel is only defined by the destination entity. Since the
> >> +destination port is constant, only the destination IP and TEID define
> >> +a tunnel. The source IP and Port have no meaning for the tunnel.
> >=20
> > Are you absolutely sure about this?
>=20
> Yes. It took me a while to realize this. The crux is this statement in TS=
 29.060,
> Section 7.3.1:

Also sounds right to me. When the tunnel is established, each side of a GTP
tunnel stores the other side's IP and TEID; port number is constant
(unfortunately, which is one of the ideas/reasons behind gtphub).

~N


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