Re: [multipathtcp] Multipath TCP Address advertisement 1/5 - Load Balancing

Alan Ford <alan.ford@gmail.com> Tue, 02 August 2016 13:56 UTC

Return-Path: <alan.ford@gmail.com>
X-Original-To: multipathtcp@ietfa.amsl.com
Delivered-To: multipathtcp@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 75CDE12D5F2 for <multipathtcp@ietfa.amsl.com>; Tue, 2 Aug 2016 06:56:52 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.7
X-Spam-Level:
X-Spam-Status: No, score=-2.7 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DWvaABxOh-iA for <multipathtcp@ietfa.amsl.com>; Tue, 2 Aug 2016 06:56:50 -0700 (PDT)
Received: from mail-wm0-x22f.google.com (mail-wm0-x22f.google.com [IPv6:2a00:1450:400c:c09::22f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4423D12D5CA for <multipathtcp@ietf.org>; Tue, 2 Aug 2016 06:56:50 -0700 (PDT)
Received: by mail-wm0-x22f.google.com with SMTP id o80so291734633wme.1 for <multipathtcp@ietf.org>; Tue, 02 Aug 2016 06:56:50 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=KmirDSc2rT76pFRgwZGWGi2noX5B2QXJGUptTqOT3k0=; b=Gpzk2xWwv5hWiHqWPNbU/Yoyt6Q9Ut1hJTed+YZ6XWaM1PbzKudc1yZdvE9HMRXCCX CQYNwUiFwRCJnPD4avNNN92mh2U32XkckW13b4NIaZnikCNf1Jak5I2u/uDNZRjatN7y ab1Da2sJ11j6L6BkbVnGggjTMbu9tOvcOq8Iqy0E2lLJoGcPj45G/ZfoL/KQENrXGnxZ JRgqVt8t1JfI6tujZDdoV1mOBiAIP+NrCFQbbdZq58U4ab29zDZYFsFDBquANVwKpTRR RfbV9vaeXDoifVIzMVFxCJjP2IQ9srobro3FgRe1PPLnFnD2/4vblXO/zkiRqo6HDvkA pVQQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=KmirDSc2rT76pFRgwZGWGi2noX5B2QXJGUptTqOT3k0=; b=QPI3CMUdY1lCPzhMOvCLM3FyXkI6Cm5WGapv2nwpA7WQPyeW+rrzJb164epK4WpPnZ 9lF/k9KDaBxlnQV5WiW+m+ahKzzEs6tJhHKUjEx3aaR1jSA+f30ru7Q/AsVkXGTV92PP bh6/uigjXcWyyu9bHyWaqugJ57y+AprdH+0P74RpbKmXzl2JxKdbdDgMwHWpefE9Ja+Z ADMV54fuj3HOYLKun0c84LnuRxJV9lBJVjoqB+Wjf5kZZjHwv/NwvtSO2nP0WTaAzJgt vQvQ/Lg2OrJyzls4eQkAl3OCJAmD2jZrtW5i5Rq1fwQasxwsDp6UNmW0Azz2/2HvG3MY emVw==
X-Gm-Message-State: AEkoousD+YFgE0AzEwbsaOv1XjZrkcxwsMRffYXuF/dSTVoddjfNrCJ+iGFS7WXm3tY6bg==
X-Received: by 10.194.97.17 with SMTP id dw17mr54920830wjb.8.1470146208753; Tue, 02 Aug 2016 06:56:48 -0700 (PDT)
Received: from alans-mbp.lan (188.201.125.91.dyn.plus.net. [91.125.201.188]) by smtp.gmail.com with ESMTPSA id q4sm2791109wjk.24.2016.08.02.06.56.48 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 02 Aug 2016 06:56:48 -0700 (PDT)
Content-Type: text/plain; charset=utf-8
Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\))
From: Alan Ford <alan.ford@gmail.com>
In-Reply-To: <5799F82E.2080306@uclouvain.be>
Date: Tue, 2 Aug 2016 14:56:47 +0100
Content-Transfer-Encoding: quoted-printable
Message-Id: <D1D81B29-141B-46E8-ADE0-E2FF67BFAAD8@gmail.com>
References: <5799F82E.2080306@uclouvain.be>
To: =?utf-8?Q?Fabien_Duch=C3=AAne?= <fabien.duchene@uclouvain.be>
X-Mailer: Apple Mail (2.3124)
Archived-At: <https://mailarchive.ietf.org/arch/msg/multipathtcp/2dOZqPZ4jZMjXiZaVTSkf5rjrQM>
Cc: "multipathtcp@ietf.org" <multipathtcp@ietf.org>
Subject: Re: [multipathtcp] Multipath TCP Address advertisement 1/5 - Load Balancing
X-BeenThere: multipathtcp@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: Multi-path extensions for TCP <multipathtcp.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/multipathtcp>, <mailto:multipathtcp-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/multipathtcp/>
List-Post: <mailto:multipathtcp@ietf.org>
List-Help: <mailto:multipathtcp-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/multipathtcp>, <mailto:multipathtcp-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 02 Aug 2016 13:56:52 -0000

Hi Fabien, all,

I support the addition of this flag - it seems useful for the two use cases you have identified below, could be added at little implementation and spec cost, and could potentially find new useful purposes in the future.

I look forward to mails 2-5 of this series ;-)

Regards,
Alan

> On 28 Jul 2016, at 13:18, Fabien Duchêne <fabien.duchene@uclouvain.be> wrote:
> 
> Hello,
> 
> As agreed in Berlin during IETF96, I'm sending a series of emails to
> discuss the different contributions proposed
> inhttps://datatracker.ietf.org/doc/draft-duchene-mptcp-add-addr/
> 
> To allow Multipath TCP to operate for servers residing behind unmodified
> layer 4 load balancers we propose to define the "B" flag in the
> MP_CAPABLE option.
> 
> This flag can only be used during the three-way handshake. When this
> flag is set, it indicates that the source IP address of the segment
> containing this flag does not accept the establishment of additional
> subflows for this connection. Otherwise, the source IP address of this
> segment can be used as destination address to create additional subflows.
> 
> There are two use cases for this flag :
> 
> - servers behind a load balancer can use this flag in the SYN+ACK to
> indicate that the IP address of the load balancer should not be used to
> establish subflows. Those servers will typically announce one or more
> other addresses with the ADD_ADDR option.
> - clients behind firewalls or NAT can use this flag in the SYN. If set
> in the SYN, the flag MUST also be set in the third ACK to support
> stateless servers.
> 
> We would appreciate your feedback on this proposition.
> 
> Thanks!
> 
> Fabien
> 
> _______________________________________________
> multipathtcp mailing list
> multipathtcp@ietf.org
> https://www.ietf.org/mailman/listinfo/multipathtcp