Re: Objection to draft-ietf-6man-rfc4291bis-07.txt - /63 and /65 RAs on linux

Alexandre Petrescu <alexandre.petrescu@gmail.com> Thu, 02 March 2017 11:06 UTC

Return-Path: <alexandre.petrescu@gmail.com>
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 D2F441297EA for <ipv6@ietfa.amsl.com>; Thu, 2 Mar 2017 03:06:41 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -5.353
X-Spam-Level:
X-Spam-Status: No, score=-5.353 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_ADSP_CUSTOM_MED=0.001, FREEMAIL_FROM=0.001, NML_ADSP_CUSTOM_MED=0.9, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_SOFTFAIL=0.665] 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 O21fKAe6QoVH for <ipv6@ietfa.amsl.com>; Thu, 2 Mar 2017 03:06:40 -0800 (PST)
Received: from oxalide-out.extra.cea.fr (oxalide-out.extra.cea.fr [132.168.224.8]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 48DD61297BE for <ipv6@ietf.org>; Thu, 2 Mar 2017 03:06:40 -0800 (PST)
Received: from pisaure.intra.cea.fr (pisaure.intra.cea.fr [132.166.88.21]) by oxalide.extra.cea.fr (8.15.2/8.15.2/CEAnet-Internet-out-2.4) with ESMTP id v22B6bb6031208; Thu, 2 Mar 2017 12:06:37 +0100
Received: from pisaure.intra.cea.fr (localhost [127.0.0.1]) by localhost (Postfix) with SMTP id 0C52820421E; Thu, 2 Mar 2017 12:06:37 +0100 (CET)
Received: from muguet1.intra.cea.fr (muguet1.intra.cea.fr [132.166.192.6]) by pisaure.intra.cea.fr (Postfix) with ESMTP id F1F3E20421C; Thu, 2 Mar 2017 12:06:36 +0100 (CET)
Received: from [10.8.34.184] (is227335.intra.cea.fr [10.8.34.184]) by muguet1.intra.cea.fr (8.15.2/8.15.2/CEAnet-Intranet-out-1.4) with ESMTP id v22B6aV5001530; Thu, 2 Mar 2017 12:06:36 +0100
Subject: Re: Objection to draft-ietf-6man-rfc4291bis-07.txt - /63 and /65 RAs on linux
To: Mikael Abrahamsson <swmike@swm.pp.se>
References: <20170223134026.GI5069@gir.theapt.org> <CAN-Dau0n6oFm538XdJOcuO1yg92BCDD3mBu5YfBVm_+g-gtcKA@mail.gmail.com> <CAL9jLaYO=uYgVfSZ0SoSe0SujJ1xgwEKE8WLzo_keJHywgXTtg@mail.gmail.com> <CAN-Dau1vJV5O_Ythp6THkAu4-YZXV82Upny1V+ybbjCVZQQX=A@mail.gmail.com> <27cce319-18ac-5c0e-3497-af92344f0062@gmail.com> <de4988be-6031-08d9-84ce-21c3fa4f9bc9@gmail.com> <98401ef7-cf41-b4a0-4d11-a7d840181bd0@gmail.com> <1047f5fc-ae40-be52-6bab-27f31fe5e045@gmail.com> <9a94feac-8d59-b153-d41c-04fc371e4db4@gmail.com> <CAO42Z2z7v4gDk91b6Of-1sczV88m3B9kzn0MeJU_VBJ416k6Ww@mail.gmail.com> <ae35b45a-0398-840f-fc0d-1f64dd2fcc58@gmail.com> <37851ee3-03be-8bee-6190-f4d28df86305@gmail.com> <alpine.DEB.2.02.1703012051590.30226@uplift.swm.pp.se> <b5784622-c24e-a531-4e68-249b03701941@gmail.com> <CAAedzxrSTFe0GgYuvtXPNE=R_ZCXotxL7HbKdj5A4-869rncmw@mail.gmail.com> <ba025be6-709d-87b4-f388-d6f143408277@gmail.com> <alpine.DEB.2.02.1703021029010.30226@uplift.swm.pp.se>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
Message-ID: <4e17a9f4-6daf-787f-0321-3327fe601d70@gmail.com>
Date: Thu, 2 Mar 2017 12:06:41 +0100
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.1
MIME-Version: 1.0
In-Reply-To: <alpine.DEB.2.02.1703021029010.30226@uplift.swm.pp.se>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 8bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/v6YjkvTXdv6OcZz7A-hsZXflLEo>
Cc: Erik Kline <ek@google.com>, IETF IPv6 Mailing List <ipv6@ietf.org>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.17
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: Thu, 02 Mar 2017 11:06:42 -0000

Le 02/03/2017 à 10:31, Mikael Abrahamsson a écrit :
> On Thu, 2 Mar 2017, Alexandre Petrescu wrote:
>
>> perfectly fine to use that plen==65 to have an entry in the rt
>> table, and use a manually configured address in that plen.
>
> Linux does the right thing in not autoconfiguring itself address(es)
> when plen isn't 64.

Whereas it is the right thing if on Ethernet (RFC2464) it is wrong on 
cellular links for which we have no RFC IPv6-over-foo.  Same with USB 
and to a certain extent on WiFi.

> However, what does it do when it receives an PIO with plen of 65 and
> M=1 and then it gets an IA_NA and configures that on the interface?

I dont know.  But I guess it still calls that 65 plen "illegal".

> Doesn't it install the /65 in the routing table?

Dont know, but there is a need to check.

How about the /63 case?  Do you think it is normal that linux kernel 
does not configure an IP address on Ethernet when receiving a plen==63?

Alex

>