netdev - Re: [PATCH net-next] net/gtp: Add udp source port generation according to flow hash

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Message-ID: <CAJ3xEMiF_T_JxTik+yxvYoBQCiG=kKzukSsORApKB9nhTSvqeQ@mail.gmail.com>
Date:   Wed, 15 Mar 2017 18:14:02 +0200
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     Andreas Schultz <aschultz@...p.net>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Tom Herbert <tom@...bertland.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        laforge <laforge@...monks.org>,
        Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net/gtp: Add udp source port generation
 according to flow hash

On Thu, Feb 23, 2017 at 7:54 PM, David Miller <davem@...emloft.net> wrote:
> From: Andreas Schultz <aschultz@...p.net>
> Date: Thu, 23 Feb 2017 18:19:16 +0100 (CET)
>
>> When we are talking about the xmit path, then currently none of the
>> receivers we are talking to is going to be Linux and we have no
>> idea how they will behave nor do we have any influence on them. Do
>> we really need to make assumptions about other vendors implementations?
>>
>> Traces on live GRX networks show that about 90% of the SGSN/S-GW
>> that would talk to us always use the default GTP-U port as source
>> port. Some multi chassis GSN's seem to assign source port ranges to
>> chassis, but that has nothing todo with DDOS protection.
>
> This is exactly what other UDP tunnel implementations did before
> flow separation was prevelant.
>
> I don't see the point of any of this discussion discouraging the
> enablement of proper flow separation.

Hi Dave,

So where do we  go from here? should I resubmit the patch?

Or.