Re: [Casm] [homenet] prefix assignment

Juliusz Chroboczek <jch@irif.fr> Wed, 29 March 2017 20:56 UTC

Return-Path: <jch@irif.fr>
X-Original-To: casm@ietfa.amsl.com
Delivered-To: casm@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4569412945D; Wed, 29 Mar 2017 13:56:28 -0700 (PDT)
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 HP2lVjp_IezK; Wed, 29 Mar 2017 13:56:26 -0700 (PDT)
Received: from korolev.univ-paris7.fr (korolev.univ-paris7.fr [IPv6:2001:660:3301:8000::1:2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 64909129891; Wed, 29 Mar 2017 13:56:25 -0700 (PDT)
Received: from mailhub.math.univ-paris-diderot.fr (mailhub.math.univ-paris-diderot.fr [81.194.30.253]) by korolev.univ-paris7.fr (8.14.4/8.14.4/relay1/56228) with ESMTP id v2TKuNUF013675; Wed, 29 Mar 2017 22:56:23 +0200
Received: from mailhub.math.univ-paris-diderot.fr (localhost [127.0.0.1]) by mailhub.math.univ-paris-diderot.fr (Postfix) with ESMTP id ADB7AD78B7; Wed, 29 Mar 2017 22:56:23 +0200 (CEST)
X-Virus-Scanned: amavisd-new at math.univ-paris-diderot.fr
Received: from mailhub.math.univ-paris-diderot.fr ([127.0.0.1]) by mailhub.math.univ-paris-diderot.fr (mailhub.math.univ-paris-diderot.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id arPhDVrfdgX9; Wed, 29 Mar 2017 22:56:22 +0200 (CEST)
Received: from ijon.irif.fr (dhcp-8558.meeting.ietf.org [31.133.133.88]) (Authenticated sender: jch) by mailhub.math.univ-paris-diderot.fr (Postfix) with ESMTPSA id D7242D78F6; Wed, 29 Mar 2017 22:56:18 +0200 (CEST)
Date: Wed, 29 Mar 2017 15:56:22 -0500
Message-ID: <87shlvhkeh.wl-jch@irif.fr>
From: Juliusz Chroboczek <jch@irif.fr>
To: Michael Richardson <mcr+ietf@sandelman.ca>
Cc: casm@ietf.org, anima@ietf.org, homenet@ietf.org
In-Reply-To: <28218.1490799848@obiwan.sandelman.ca>
References: <21984.1490644275@obiwan.sandelman.ca> <CANMVOuzYpcBdG2ZOhEXRnQU0Q=_i0i-09SPKzruJnznVoWW=OA@mail.gmail.com> <9240.1490649148@obiwan.sandelman.ca> <672bec4c-0e93-362c-21bf-99938cd0a066@gmail.com> <27800.1490654163@obiwan.sandelman.ca> <27680a33-708d-84b7-f378-3a47ee71840a@gmail.com> <2491.1490716597@obiwan.sandelman.ca> <5a41375c-2a4c-d5ca-e703-06d8e76f8728@gmail.com> <28218.1490799848@obiwan.sandelman.ca>
User-Agent: Wanderlust/2.15.9
MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue")
Content-Type: text/plain; charset=US-ASCII
X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (korolev.univ-paris7.fr [194.254.61.138]); Wed, 29 Mar 2017 22:56:23 +0200 (CEST)
X-Miltered: at korolev with ID 58DC1F77.000 by Joe's j-chkmail (http : // j-chkmail dot ensmp dot fr)!
X-j-chkmail-Enveloppe: 58DC1F77.000 from mailhub.math.univ-paris-diderot.fr/mailhub.math.univ-paris-diderot.fr/null/mailhub.math.univ-paris-diderot.fr/<jch@irif.fr>
X-j-chkmail-Score: MSGID : 58DC1F77.000 on korolev.univ-paris7.fr : j-chkmail score : . : R=. U=. O=. B=0.000 -> S=0.000
X-j-chkmail-Status: Ham
Archived-At: <https://mailarchive.ietf.org/arch/msg/casm/zLM_bm73vz-BGRA8mR3sYeK8-Ds>
X-Mailman-Approved-At: Wed, 29 Mar 2017 14:28:05 -0700
Subject: Re: [Casm] [homenet] prefix assignment
X-BeenThere: casm@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: Coordinated Address Space Management <casm.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/casm>, <mailto:casm-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/casm/>
List-Post: <mailto:casm@ietf.org>
List-Help: <mailto:casm-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/casm>, <mailto:casm-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 29 Mar 2017 20:56:28 -0000

brian> But if the CE includes a little autonomic service agent (ASA) which
brian> is in the ISP's security domain (not the SOHO domain), it can act for
brian> HNCP to solicit address space from the ISP. That's the southern side
brian> of the CASM model and the northern side of HNCP.

HNCP just doesn't care.  HNCP has a notion of "External Connection", and
an External Connection may provide one or more External Prefixes.  HNCP
will assign to each link in the HNCP one /64 from each External Prefix.

HNCP doesn't care where these External Connection TLVs come from, but it
is my understanding that there is WG consensus that DHCPv6-PD is the
default mechanism.  I don't think there's anything in any of our RFCs that
would prevent an implementation from obtaining External Prefixes using
a different protocol, e.g. manual configuration, a proprietary
provisioning protocol or even algorithmically derived from an IPv4 address
(as with 6rd).

Both implementations of HNCP are easy to extend with a different mechanism
for obtaining External Prefixes, should you wish to experiment.

-- Juliusz