IETF Logo Mail Archive

Re: Last Call: <draft-ietf-6man-rfc1981bis-04.txt> (Path MTU Discovery for IP version 6) to Internet Standard

Joe Touch <touch@isi.edu> Tue, 07 February 2017 21:24 UTC

Return-Path: <touch@isi.edu>
X-Original-To: ietf@ietfa.amsl.com
Delivered-To: ietf@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BA669129499; Tue, 7 Feb 2017 13:24:52 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.9
X-Spam-Level:
X-Spam-Status: No, score=-6.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RP_MATCHES_RCVD=-0.001, URIBL_BLOCKED=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 aVChaKyucpBN; Tue, 7 Feb 2017 13:24:51 -0800 (PST)
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 702EA128874; Tue, 7 Feb 2017 13:24:51 -0800 (PST)
Received: from [128.9.184.104] ([128.9.184.104]) (authenticated bits=0) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id v17LOMfc024098 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Tue, 7 Feb 2017 13:24:23 -0800 (PST)
Subject: Re: Last Call: <draft-ietf-6man-rfc1981bis-04.txt> (Path MTU Discovery for IP version 6) to Internet Standard
To: otroan@employees.org
References: <148599312602.18643.4886733052828400859.idtracker@ietfa.amsl.com> <1859B1D9-9E42-4D65-98A8-7A326EDDE560@netapp.com> <f8291774-409e-2948-3b29-83dbb09d39d9@si6networks.com> <63eaf82e-b6d5-bff5-4d48-479e80ed4698@gmail.com> <2d36e28c-ee7d-20fc-3fec-54561e520691@si6networks.com> <C0A114C1-5E4A-4B8E-A408-55AF1E30873F@netapp.com> <3A5429F6-0EA6-436A-AF30-E55C9026F456@employees.org> <8cf1fe7d-bdfd-5e81-e61f-55d9ecd5d28a@isi.edu> <7E9AB9E8-3FCB-4475-BEEB-F18CFC4BC752@employees.org> <8076a1ea-182d-9cbe-f954-3e50f0fc53d9@isi.edu> <E11F9A4D-DE9E-4BFD-8D0D-252842719FC5@employees.org> <a479d81e-42f9-0695-f31a-c494c02de9af@isi.edu> <4118C6CE-7649-436B-9598-78A034AFFE50@employees.org>
From: Joe Touch <touch@isi.edu>
Message-ID: <1d3c4a88-8c50-a0e2-f852-798d671c8750@isi.edu>
Date: Tue, 07 Feb 2017 13:24:23 -0800
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0
MIME-Version: 1.0
In-Reply-To: <4118C6CE-7649-436B-9598-78A034AFFE50@employees.org>
Content-Type: text/plain; charset="windows-1252"
Content-Transfer-Encoding: 7bit
X-ISI-4-43-8-MailScanner: Found to be clean
X-MailScanner-From: touch@isi.edu
Archived-At: <https://mailarchive.ietf.org/arch/msg/ietf/x_d7pU5C_fV8NlWhhUqPLX4D64o>
Cc: 6man WG <ipv6@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "draft-ietf-6man-rfc1981bis@ietf.org" <draft-ietf-6man-rfc1981bis@ietf.org>, "tsv-area@ietf.org" <tsv-area@ietf.org>, "6man-chairs@ietf.org" <6man-chairs@ietf.org>
X-BeenThere: ietf@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: IETF-Discussion <ietf.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ietf>, <mailto:ietf-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ietf/>
List-Post: <mailto:ietf@ietf.org>
List-Help: <mailto:ietf-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ietf>, <mailto:ietf-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 07 Feb 2017 21:24:53 -0000

I'd add one sentence about Fred's observation too:

In addition, spoofed ICMP messages can also affect the correct operation
of PMTUD.

That'd do it...

Joe


On 2/7/2017 12:32 PM, otroan@employees.org wrote:
> Joe,
>
> Thanks!
>
>> I appreciate that you want to not point at PLPMTUD because it's not
>> widely supported, but **for the same reason** this doc should not hold
>> up this solution without pointing out very clearly that it basically
>> isn't going to be work.
> Would something like this help?
> (borrowed from https://en.wikipedia.org/wiki/Path_MTU_Discovery)
>
> "Many network security devices block all ICMP messages for perceived
>  security benefits, including the errors that are necessary for the proper
>  operation of PMTUD. This can result in connections that complete the
>  TCP three-way handshake correctly, but then hang when data is transferred.
>  This state is referred to as a black hole connection."
>
>
> Best regards,
> Ole

v2.23.0 | Report a Bug | By Email