Re: [6lo] 6lowpan Fragmentation design team interest?

Carsten Bormann <cabo@tzi.org> Thu, 20 July 2017 07:53 UTC

Return-Path: <cabo@tzi.org>
X-Original-To: 6lo@ietfa.amsl.com
Delivered-To: 6lo@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 60EFC126B72 for <6lo@ietfa.amsl.com>; Thu, 20 Jul 2017 00:53:09 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.2
X-Spam-Level:
X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3] autolearn=ham autolearn_force=no
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 8-pvHQFyiS2f for <6lo@ietfa.amsl.com>; Thu, 20 Jul 2017 00:53:08 -0700 (PDT)
Received: from mailhost.informatik.uni-bremen.de (mailhost.informatik.uni-bremen.de [IPv6:2001:638:708:30c9::12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 56738126557 for <6lo@ietf.org>; Thu, 20 Jul 2017 00:53:08 -0700 (PDT)
X-Virus-Scanned: amavisd-new at informatik.uni-bremen.de
Received: from submithost.informatik.uni-bremen.de (submithost.informatik.uni-bremen.de [IPv6:2001:638:708:30c9::b]) by mailhost.informatik.uni-bremen.de (8.14.5/8.14.5) with ESMTP id v6K7qZQF029990; Thu, 20 Jul 2017 09:52:35 +0200 (CEST)
Received: from dhcp-808c.meeting.ietf.org (dhcp-808c.meeting.ietf.org [31.133.128.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by submithost.informatik.uni-bremen.de (Postfix) with ESMTPSA id 3xCmMl4PyPz3Z3M; Thu, 20 Jul 2017 09:52:35 +0200 (CEST)
Content-Type: text/plain; charset=utf-8
Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\))
From: Carsten Bormann <cabo@tzi.org>
In-Reply-To: <CAC8QAcdeGkYm2FxeiWkWKo4utA6Zgcq0P3a-mGCv4SWwKhQDPg@mail.gmail.com>
Date: Thu, 20 Jul 2017 09:52:33 +0200
Cc: Pascal Thubert <pthubert@cisco.com>, Samita Chakrabarti <samitac.ietf@gmail.com>, Gorry Fairhurst <gorry@erg.abdn.ac.uk>, lo <6lo@ietf.org>
X-Mao-Original-Outgoing-Id: 522229953.050354-8325d2c414e438f684361939672e095e
Content-Transfer-Encoding: quoted-printable
Message-Id: <AEBB1A46-68AC-43FE-B3D0-83ED6367FD5F@tzi.org>
References: <CAKmdBpcXJcWH3x2EE+FmM7sVJvo5ahpg-RHS5oyrdLsnA9Ck-g@mail.gmail.com> <7DA7530E-A090-48B3-9DD4-679FB8B8D1E4@tzi.org> <CAC8QAcdeGkYm2FxeiWkWKo4utA6Zgcq0P3a-mGCv4SWwKhQDPg@mail.gmail.com>
To: sarikaya@ieee.org
X-Mailer: Apple Mail (2.3273)
Archived-At: <https://mailarchive.ietf.org/arch/msg/6lo/JLQxdvuSCJGOW9oH5uaNk8l8944>
Subject: Re: [6lo] 6lowpan Fragmentation design team interest?
X-BeenThere: 6lo@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: "Mailing list for the 6lo WG for Internet Area issues in IPv6 over constrained node networks." <6lo.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/6lo>, <mailto:6lo-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/6lo/>
List-Post: <mailto:6lo@ietf.org>
List-Help: <mailto:6lo-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/6lo>, <mailto:6lo-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 20 Jul 2017 07:53:09 -0000

> On Jul 20, 2017, at 09:45, Behcet Sarikaya <sarikaya2012@gmail.com> wrote:
> 
> Hi Pascal,
> 
> Is fragmentation an issue in lpwan also?

Definitely, and there is a draft for that:

  LPWAN Static Context Header Compression (SCHC) and fragmentation for
                              IPv6 and UDP
               draft-ietf-lpwan-ipv6-static-context-hc-05

The tradeoffs are rather different there, so I’m not sure that the lpwan work applies to 6lo.

> If yes, maybe a joint DT can be formed.
> 
> Another question: I think we are talking about 802.15.4 maximum frame size of 127 limitation here, is that right?

The fragmentation scheme is general, but that number is the ballpark of the fragment size this would address (which is very different from LPWAN).

Grüße, Carsten