netdev - Re: [PATCH net-next v3 1/8] gtp: add documentation

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Message-ID: <20170221011245.GB1961@my.box>
Date:   Tue, 21 Feb 2017 02:12:45 +0100
From:   Neels Hofmeyr <nhofmeyr@...mocom.de>
To:     Andreas Schultz <aschultz@...p.net>
Cc:     laforge <laforge@...monks.org>, Jonas Bonn <jonas@...thpole.se>,
        netdev <netdev@...r.kernel.org>,
        osmocom-net-gprs <osmocom-net-gprs@...ts.osmocom.org>,
        Lionel Gauthier <Lionel.Gauthier@...ecom.fr>,
        pablo <pablo@...filter.org>
Subject: Re: [PATCH net-next v3 1/8] gtp: add documentation

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.
> > 
> > Are you absolutely sure about this?
> 
> 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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