[6lowpan] IETF85: Adaptation Layer Fragmentation Indication (ALFI) on intarea agenda

Carsten Bormann <cabo@tzi.org> Thu, 25 October 2012 08:12 UTC

Return-Path: <cabo@tzi.org>
X-Original-To: 6lowpan@ietfa.amsl.com
Delivered-To: 6lowpan@ietfa.amsl.com
Received: from localhost (localhost []) by ietfa.amsl.com (Postfix) with ESMTP id AE5E321F89B6; Thu, 25 Oct 2012 01:12:11 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -106.114
X-Spam-Status: No, score=-106.114 tagged_above=-999 required=5 tests=[AWL=0.135, BAYES_00=-2.599, HELO_EQ_DE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100]
Received: from mail.ietf.org ([]) by localhost (ietfa.amsl.com []) (amavisd-new, port 10024) with ESMTP id xTLLZ16mDoCj; Thu, 25 Oct 2012 01:12:11 -0700 (PDT)
Received: from informatik.uni-bremen.de (mailhost.informatik.uni-bremen.de [IPv6:2001:638:708:30c9::12]) by ietfa.amsl.com (Postfix) with ESMTP id C609421F89CB; Thu, 25 Oct 2012 01:12:10 -0700 (PDT)
X-Virus-Scanned: amavisd-new at informatik.uni-bremen.de
Received: from smtp-fb3.informatik.uni-bremen.de (smtp-fb3.informatik.uni-bremen.de []) by informatik.uni-bremen.de (8.14.3/8.14.3) with ESMTP id q9P8Bw0a014709; Thu, 25 Oct 2012 10:12:00 +0200 (CEST)
Received: from [] (reingewinn.informatik.uni-bremen.de []) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp-fb3.informatik.uni-bremen.de (Postfix) with ESMTPSA id 1D491D73; Thu, 25 Oct 2012 10:11:46 +0200 (CEST)
Content-Type: text/plain; charset="iso-8859-1"
Mime-Version: 1.0 (Mac OS X Mail 6.2 \(1499\))
From: Carsten Bormann <cabo@tzi.org>
Date: Thu, 25 Oct 2012 10:11:46 +0200
Content-Transfer-Encoding: quoted-printable
Message-Id: <4FB2FFE4-ABD7-44DD-84F0-C5BA38493891@tzi.org>
To: "6lowpan@ietf.org" <6lowpan@ietf.org>, "core@ietf.org WG" <core@ietf.org>
X-Mailer: Apple Mail (2.1499)
Subject: [6lowpan] IETF85: Adaptation Layer Fragmentation Indication (ALFI) on intarea agenda
X-BeenThere: 6lowpan@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
Reply-To: "6lowpan@ietf.org" <6lowpan@ietf.org>
List-Id: Working group discussion for IPv6 over LowPan networks <6lowpan.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/6lowpan>, <mailto:6lowpan-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/6lowpan>
List-Post: <mailto:6lowpan@ietf.org>
List-Help: <mailto:6lowpan-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/6lowpan>, <mailto:6lowpan-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 25 Oct 2012 08:12:11 -0000

One problem we have in 6LoWPAN networks is that the 6LoWPAN fragmentation is "transparent", i.e. there is no equivalent of Path MTU discovery that would enable applications to make informed decisions about the packet sizes they choose.
Since that problem is not specific to 6LoWPAN, and not even to IPv6, it is being discussed in the intarea working group.
(The specific proposal is currently focused on IPv6, however.)

If you care about this subject, below is a snippet from the current intarea agenda (which, of course, can change).

Grüße, Carsten

http://www.ietf.org/proceedings/85/agenda/agenda-85-intarea says:

> intarea WG Agenda 
> IETF 85
> Monday, November 5, 2012
> 1300-1500 Afternoon Session I
> 1. Agenda Bashing, WG & Document Status (Chairs) 10 minutes
> 2. Adaptation Layer Fragmentation Indication
>    Carsten Bormann 20 minutes
>    draft-bormann-intarea-alfi-01
> Objective:
> Present the draft that describes a mechanism by which an
> IPv6 adaptation layer can indicate the presence of
> fragmentation capability and can specify preferred packet
> sizes for the link type. The goal is to publicize the work
> and identify a suitable venue to continue this work.