Re: Review of draft-ietf-6man-rfc4291bis-06

Randy Bush <randy@psg.com> Fri, 13 January 2017 07:09 UTC

Return-Path: <randy@psg.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 7159412948F; Thu, 12 Jan 2017 23:09:01 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -10.1
X-Spam-Level:
X-Spam-Status: No, score=-10.1 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RP_MATCHES_RCVD=-3.199, 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 Ntl5aEPLZtaH; Thu, 12 Jan 2017 23:09:00 -0800 (PST)
Received: from ran.psg.com (ran.psg.com [IPv6:2001:418:8006::18]) (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 2B3B3129479; Thu, 12 Jan 2017 23:09:00 -0800 (PST)
Received: from localhost ([127.0.0.1] helo=ryuu.psg.com) by ran.psg.com with esmtp (Exim 4.86_2) (envelope-from <randy@psg.com>) id 1cRvys-0003L2-Bp; Fri, 13 Jan 2017 07:08:58 +0000
Date: Fri, 13 Jan 2017 16:08:55 +0900
Message-ID: <m2lguffnco.wl-randy@psg.com>
From: Randy Bush <randy@psg.com>
To: Lorenzo Colitti <lorenzo@google.com>
Subject: Re: Review of draft-ietf-6man-rfc4291bis-06
In-Reply-To: <CAKD1Yr1cvZ8Y3+bHeML=Xwqr+YgDspZGnZi=jqQj4qe2kMc4zw@mail.gmail.com>
References: <148406593094.22166.2894840062954191477.idtracker@ietfa.amsl.com> <m2fukqbbwv.wl-randy@psg.com> <F6953234-3F85-4E28-9861-433ADD01A490@gmail.com> <m2wpdzhncn.wl-randy@psg.com> <82245ef2-cd34-9bd6-c04e-f262e285f983@gmail.com> <m2d1frhjfn.wl-randy@psg.com> <18e6e13c-e605-48ff-4906-2d5531624d64@gmail.com> <CAKD1Yr1cvZ8Y3+bHeML=Xwqr+YgDspZGnZi=jqQj4qe2kMc4zw@mail.gmail.com>
User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/24.5 Mule/6.0 (HANACHIRUSATO)
MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue")
Content-Type: text/plain; charset=US-ASCII
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/r79d6mRYcN8kDgPnaj0haMnjka4>
Cc: IPv6 List <ipv6@ietf.org>, IETF <ietf@ietf.org>, int-dir@ietf.org, Bob Hinden <bob.hinden@gmail.com>, draft-ietf-6man-rfc4291bis.all@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: Fri, 13 Jan 2017 07:09:01 -0000

> So while Randy may well be right that we will move away from classful
> eventually

that is the line i was fed 15+ years ago.  i did not accept it then and
i see no good reason to accept it now.

> we certainly never had it in the top 64 bite of the address

bzzt!  you may want to look at rfc 2450.

> For now, I'd much prefer to just add a similar exception to the one we
> have in 7421.

you'll need to start an iana registry.  for p2p some use /127, some
/126, and i have seen /120 on a multipoint mesh, worked fine.

we have had to fight massively with vendors to make it classless.
please do not give them excuses to break things.

randy