IETF Logo Mail Archive

Re: [Gen-art] Genart telechat review of draft-ietf-6man-rfc1981bis-06

Joe Touch <touch@isi.edu> Thu, 27 April 2017 17:00 UTC

Return-Path: <touch@isi.edu>
X-Original-To: gen-art@ietfa.amsl.com
Delivered-To: gen-art@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AE4F2129B37; Thu, 27 Apr 2017 10:00:16 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.901
X-Spam-Level:
X-Spam-Status: No, score=-6.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RP_MATCHES_RCVD=-0.001] 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 Vy4WfhiOxJxD; Thu, 27 Apr 2017 10:00:15 -0700 (PDT)
Received: from boreas.isi.edu (boreas.isi.edu [128.9.160.161]) (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 A61B0129B51; Thu, 27 Apr 2017 09:57:59 -0700 (PDT)
Received: from [128.9.160.211] (mul.isi.edu [128.9.160.211]) (authenticated bits=0) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id v3RGvh92009153 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Thu, 27 Apr 2017 09:57:43 -0700 (PDT)
To: Stewart Bryant <stewart.bryant@gmail.com>, Brian E Carpenter <brian.e.carpenter@gmail.com>, Fred Baker <fredbaker.ietf@gmail.com>
Cc: gen-art@ietf.org, 6man WG <ipv6@ietf.org>, IETF-Discussion Discussion <ietf@ietf.org>, draft-ietf-6man-rfc1981bis.all@ietf.org
References: <149305392811.25808.15115824976388262628@ietfa.amsl.com> <497d3868-406a-a38f-56d8-391b0fc16032@isi.edu> <a974da1d-a9e7-8c64-8086-0955f2dffb12@gmail.com> <f6088ab8-3533-96f1-d9eb-f8462b1f4a1b@isi.edu> <99FD5A05-EDBE-4764-941C-C95BD689237B@gmail.com> <a7c8a2d8-6a67-e78c-a3d9-7bf7f0b767a9@gmail.com> <8fdddab8-dba8-d151-6552-882d2c9a7918@gmail.com>
From: Joe Touch <touch@isi.edu>
Message-ID: <d998ea12-71d3-1a8f-03cf-91be1f710f9e@isi.edu>
Date: Thu, 27 Apr 2017 09:57:43 -0700
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.0.1
MIME-Version: 1.0
In-Reply-To: <8fdddab8-dba8-d151-6552-882d2c9a7918@gmail.com>
Content-Type: text/plain; charset="windows-1252"
Content-Transfer-Encoding: 7bit
Content-Language: en-US
X-ISI-4-43-8-MailScanner: Found to be clean
X-MailScanner-From: touch@isi.edu
Archived-At: <https://mailarchive.ietf.org/arch/msg/gen-art/PgWALFfeW5cw4SionWqxtBfS3zI>
Subject: Re: [Gen-art] Genart telechat review of draft-ietf-6man-rfc1981bis-06
X-BeenThere: gen-art@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: "GEN-ART: General Area Review Team" <gen-art.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/gen-art>, <mailto:gen-art-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/gen-art/>
List-Post: <mailto:gen-art@ietf.org>
List-Help: <mailto:gen-art-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/gen-art>, <mailto:gen-art-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 27 Apr 2017 17:00:17 -0000


On 4/27/2017 5:36 AM, Stewart Bryant wrote:
> ...
> So this seems to me to be an argument of principle vs pragmatism, and
> in general pragmatism has served the Internet well so far.
>
> I think pragmatism is what Fred and Brian arguing for. It is certainly
> the general approach that I support.

IMO, 1981bis should limit its advice to behavior in response to ICMPs, e.g.:

   In reaction to a received ICMP message, a node MUST NOT reduce its estimate of the Path MTU below the IPv6
   minimum link MTU.

Doing otherwise presents too big an attack surface.

Any other advice on how an end system manages its idea of MTU or
otherwise overrides the 1981bis computation of path MTU should be
limited to host requirements documents, not this one.

Joe

v2.23.0 | Report a Bug | By Email