IETF Logo Mail Archive

Re: [v6ops] new draft: draft-asati-v6ops-dad-loopback

Washam Fan <washam.fan@gmail.com> Fri, 21 October 2011 03:11 UTC

Return-Path: <washam.fan@gmail.com>
X-Original-To: v6ops@ietfa.amsl.com
Delivered-To: v6ops@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 079EF21F852E; Thu, 20 Oct 2011 20:11:18 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -3.599
X-Spam-Level:
X-Spam-Status: No, score=-3.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KpyrUyeFV1gp; Thu, 20 Oct 2011 20:11:17 -0700 (PDT)
Received: from mail-gy0-f172.google.com (mail-gy0-f172.google.com [209.85.160.172]) by ietfa.amsl.com (Postfix) with ESMTP id 6D5AC21F846C; Thu, 20 Oct 2011 20:11:17 -0700 (PDT)
Received: by gyh20 with SMTP id 20so4149911gyh.31 for <multiple recipients>; Thu, 20 Oct 2011 20:11:13 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=wTD9KChA8xP4VESafDdDPdObPjF9SCbQXnxbvog/vjM=; b=rovqEfl8Iw1Nxj874EKVAsvwp5sOIqb6eHhYtNBnoWY1bce0gOrR2KrqsFIMc1lnVv FQ/FhvNIyFz3/J/XCWkfttDvnGeGkUy9eVN2zlZkZpaR6O+W54KOWNRlz4bEO3asrGHo IbL/g9GeHMQu3VDexrXffeA0Do+wKA8PSqzLE=
MIME-Version: 1.0
Received: by 10.182.115.38 with SMTP id jl6mr725409obb.35.1319166673756; Thu, 20 Oct 2011 20:11:13 -0700 (PDT)
Received: by 10.182.44.74 with HTTP; Thu, 20 Oct 2011 20:11:13 -0700 (PDT)
In-Reply-To: <5B6B2B64C9FE2A489045EEEADDAFF2C3031FD138@XMB-RCD-109.cisco.com>
References: <201108261355.p7QDt0r13136@ftpeng-update.cisco.com> <CAAedzxp0XaO2LocUWvVogz8+MhFixhe3Y7-ts=sA-G9AP=rZrA@mail.gmail.com> <CAKD1Yr1gnPVxMZqFbmgnw5PKD00HwM_7gAGJeGSapqmQefsbPg@mail.gmail.com> <5B6B2B64C9FE2A489045EEEADDAFF2C3030A3507@XMB-RCD-109.cisco.com> <CAAuHL_CfPtKb_KDjf3uJT4Qdji13vJXvFfAdStrNZ2JyrUtS4w@mail.gmail.com> <5B6B2B64C9FE2A489045EEEADDAFF2C3031FD138@XMB-RCD-109.cisco.com>
Date: Fri, 21 Oct 2011 11:11:13 +0800
Message-ID: <CAAuHL_CPaS91svpC7Ded7NVp4AF-MpfoKgn2=jRwhtMnDJ1LjQ@mail.gmail.com>
From: Washam Fan <washam.fan@gmail.com>
To: "Hemant Singh (shemant)" <shemant@cisco.com>
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: quoted-printable
Cc: v6ops@ietf.org, draft-asati-v6ops-dad-loopback@tools.ietf.org, ipv6@ietf.org
Subject: Re: [v6ops] new draft: draft-asati-v6ops-dad-loopback
X-BeenThere: v6ops@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: v6ops discussion list <v6ops.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/v6ops>, <mailto:v6ops-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/v6ops>
List-Post: <mailto:v6ops@ietf.org>
List-Help: <mailto:v6ops-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/v6ops>, <mailto:v6ops-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 21 Oct 2011 03:11:18 -0000

Hi Hemant,

2011/10/20 Hemant Singh (shemant) <shemant@cisco.com>:
> Washam,
>
> -----Original Message-----
> From: Washam Fan [mailto:washam.fan@gmail.com]
> Sent: Thursday, October 20, 2011 9:47 AM
> To: Hemant Singh (shemant)
> Cc: Lorenzo Colitti; Erik Kline; v6ops@ietf.org;
> draft-asati-v6ops-dad-loopback@tools.ietf.org; ipv6@ietf.org
> Subject: Re: [v6ops] new draft: draft-asati-v6ops-dad-loopback
>
>>Since NS(DAD) traverse the same link, couldn't we just use src MAC of
> the received NS(DAD) to identify if the NS is the one sent by the
> interface earlier?
>
> No.  Two nodes could almost simultaneously issue a NS(DAD) and both the
> nodes have the same mac-address and thus the situation is a DAD failure
> and not a looped back NS(DAD).

Good catch. Thanks.
washam

> I use the term of NS(DAD) to denote a NS
> issue for the purpose of DAD where the NS has a unspecified source
> address.  That is why a nonce is needed and specified in a completed
> algorithm to detect looped back NS(DAD) messages in
>
> http://tools.ietf.org/html/draft-hsingh-6man-enhanced-dad-01
>
> Hemant
>

v2.23.0 | Report a Bug | By Email