Re: [dna] #17: DHCP and ND probes complete with different results

Suresh Krishnan <suresh.krishnan@ericsson.com> Wed, 16 September 2009 19:21 UTC

Return-Path: <suresh.krishnan@ericsson.com>
X-Original-To: dna@core3.amsl.com
Delivered-To: dna@core3.amsl.com
Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 5041E3A69FA for <dna@core3.amsl.com>; Wed, 16 Sep 2009 12:21:44 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.599
X-Spam-Level:
X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4]
Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yFzovLCURis6 for <dna@core3.amsl.com>; Wed, 16 Sep 2009 12:21:43 -0700 (PDT)
Received: from imr1.ericy.com (imr1.ericy.com [198.24.6.9]) by core3.amsl.com (Postfix) with ESMTP id 9481F3A6827 for <dna@ietf.org>; Wed, 16 Sep 2009 12:21:43 -0700 (PDT)
Received: from eusrcmw750.eamcs.ericsson.se (eusrcmw750.exu.ericsson.se [138.85.77.50]) by imr1.ericy.com (8.13.1/8.13.1) with ESMTP id n8GJKiAS032683; Wed, 16 Sep 2009 14:22:32 -0500
Received: from eusrcmw751.eamcs.ericsson.se ([138.85.77.51]) by eusrcmw750.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.3959); Wed, 16 Sep 2009 14:21:47 -0500
Received: from eusaamw0706.eamcs.ericsson.se ([147.117.20.31]) by eusrcmw751.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.3959); Wed, 16 Sep 2009 14:21:46 -0500
Received: from [142.133.10.113] (147.117.20.212) by eusaamw0706.eamcs.ericsson.se (147.117.20.91) with Microsoft SMTP Server id 8.1.375.2; Wed, 16 Sep 2009 15:21:46 -0400
Message-ID: <4AB13993.7000800@ericsson.com>
Date: Wed, 16 Sep 2009 15:16:35 -0400
From: Suresh Krishnan <suresh.krishnan@ericsson.com>
User-Agent: Thunderbird 2.0.0.23 (X11/20090817)
MIME-Version: 1.0
To: Bernard Aboba <bernard_aboba@hotmail.com>
References: <066.877f7a236780113f81cb0d6f5fff6060@tools.ietf.org> <075.6eada793adc012b3d7e50503c25d48f6@tools.ietf.org> <BLU137-W27913D96DEE50BFBF84C2D93E20@phx.gbl>
In-Reply-To: <BLU137-W27913D96DEE50BFBF84C2D93E20@phx.gbl>
Content-Type: text/plain; charset="ISO-8859-1"; format=flowed
Content-Transfer-Encoding: 7bit
X-OriginalArrivalTime: 16 Sep 2009 19:21:46.0697 (UTC) FILETIME=[EEA89B90:01CA3702]
Cc: "dna@ietf.org" <dna@ietf.org>
Subject: Re: [dna] #17: DHCP and ND probes complete with different results
X-BeenThere: dna@ietf.org
X-Mailman-Version: 2.1.9
Precedence: list
List-Id: DNA working group mailing list <dna.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/listinfo/dna>, <mailto:dna-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/dna>
List-Post: <mailto:dna@ietf.org>
List-Help: <mailto:dna-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dna>, <mailto:dna-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 16 Sep 2009 19:21:44 -0000

Hi Bernard,

On 09-09-16 02:43 PM, Bernard Aboba wrote:
> 
>  > o If the DHCPv6 exchange was not authenticated and the neighbor
>  > discovery exchange was protected by SEND [RFC3971], use the result
>  > from the neighbor discovery probe.
> 
> What if the RA (protected by SEND) no longer announces a prefix and 
> indicates that DHCPv6 is now used for address assignment.  Should the 
> host not use the address assigned by DHCPv6 and instead use the address 
> formed as the result of a (no longer advertised) prefix?

In this case the neighbor discovery probe will conclude with the result 
that there has been a link change (since the prefix is no longer 
advertised). So the host will conclude that neither of these addresses 
are usable on the link.

Thanks
Suresh