IETF Logo Mail Archive

Re: Updating to RFC6434 to deal with 8200-style header insertion by IPIP

Fernando Gont <fernando@gont.com.ar> Mon, 06 November 2017 18:02 UTC

Return-Path: <fernando@gont.com.ar>
X-Original-To: ipv6@ietfa.amsl.com
Delivered-To: ipv6@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3C65B13FC1A for <ipv6@ietfa.amsl.com>; Mon, 6 Nov 2017 10:02:15 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.901
X-Spam-Level:
X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-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 fASx3Fe59Z0E for <ipv6@ietfa.amsl.com>; Mon, 6 Nov 2017 10:02:13 -0800 (PST)
Received: from fgont.go6lab.si (fgont.go6lab.si [91.239.96.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 46A5013F6BC for <ipv6@ietf.org>; Mon, 6 Nov 2017 10:02:10 -0800 (PST)
Received: from [192.168.3.67] (unknown [181.165.119.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by fgont.go6lab.si (Postfix) with ESMTPSA id 2DDFD80EB1; Mon, 6 Nov 2017 19:02:06 +0100 (CET)
Subject: Re: Updating to RFC6434 to deal with 8200-style header insertion by IPIP
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, "C. M. Heard" <heard@pobox.com>, 6man WG <ipv6@ietf.org>
Cc: Michael Richardson <mcr+ietf@sandelman.ca>
References: <CACL_3VETxNVQ+YD5j6ZiWjycQ=ojAuWwB23offNdVKm+S9c_7A@mail.gmail.com> <23308.1509623865@obiwan.sandelman.ca> <CACL_3VFrcombGczXU6Zz=Pk1u2GE=wGG-r+yEefdHai1REqXmQ@mail.gmail.com> <c8911f45-2afc-9d26-c0a8-1017d034a251@gmail.com>
From: Fernando Gont <fernando@gont.com.ar>
Message-ID: <1e62fab6-c434-a474-e53b-e4c7f2d83de0@gont.com.ar>
Date: Mon, 06 Nov 2017 15:02:14 -0300
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0
MIME-Version: 1.0
In-Reply-To: <c8911f45-2afc-9d26-c0a8-1017d034a251@gmail.com>
Content-Type: text/plain; charset="utf-8"
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/4_6KKtwPxU-GhhsIR4kd_6QfAJk>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: "IPv6 Maintenance Working Group \(6man\)" <ipv6.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ipv6>, <mailto:ipv6-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ipv6/>
List-Post: <mailto:ipv6@ietf.org>
List-Help: <mailto:ipv6-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ipv6>, <mailto:ipv6-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 06 Nov 2017 18:02:15 -0000

On 11/02/2017 04:33 PM, Brian E Carpenter wrote:
> On 03/11/2017 04:26, C. M. Heard wrote:
>> On Thu, Nov 2, 2017, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
>>
>>>
>>> C. M. Heard <heard@pobox.com> wrote:
>>>     > On Wed, 01 Nov 2017, Michael Richardson wrote:
>>>     >> Yet we skip other extension headers in order to find the ULP.
>>>
>>>     > Not so. An end node that encounters an unrecognized extension header
>>> is
>>>
>>> Both AH and IPIP are well known and recognized extension headers.
> 
> AH is an extension header. "IPIP" isn't. It's Protocol 41, and Protocol 41
> is otherwise known as IPv6. (That's why it's also called IPPROTO_IPV6).
> In RFC8200 terms that makes it an "upper-layer header". Strictly speaking,
> RFC8200 doesn't specify what to do with an unrecognized upper-layer header.

Based on the std, anything that is unknown is an EH. In the context of
RFC8200/FC2460, there's only:

* Known EHs
* Known ULP
* Unknown EHs


with the last one being the default branch :-)


-- 
Fernando Gont
e-mail: fernando@gont.com.ar || fgont@si6networks.com
PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1

v2.23.0 | Report a Bug | By Email