Re: [Roll] [6tisch] Support of flow label to carry the RPL information in data packets

Fernando Gont <fernando@gont.com.ar> Thu, 17 April 2014 14:49 UTC

Return-Path: <fernando@gont.com.ar>
X-Original-To: roll@ietfa.amsl.com
Delivered-To: roll@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5594B1A0204; Thu, 17 Apr 2014 07:49:59 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.902
X-Spam-Level:
X-Spam-Status: No, score=-1.902 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham
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 Y3BnC2UAAqC5; Thu, 17 Apr 2014 07:49:54 -0700 (PDT)
Received: from web01.jbserver.net (web01.jbserver.net [IPv6:2a00:8240:6:a::1]) by ietfa.amsl.com (Postfix) with ESMTP id 28A151A01EA; Thu, 17 Apr 2014 07:49:53 -0700 (PDT)
Received: from [2001:5c0:1000:a::bc1] by web01.jbserver.net with esmtpsa (TLSv1:DHE-RSA-AES128-SHA:128) (Exim 4.82) (envelope-from <fernando@gont.com.ar>) id 1WandJ-0004WM-4F; Thu, 17 Apr 2014 16:49:45 +0200
Message-ID: <534FE9F4.9060700@gont.com.ar>
Date: Thu, 17 Apr 2014 11:49:24 -0300
From: Fernando Gont <fernando@gont.com.ar>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0
MIME-Version: 1.0
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, "6man@ietf.org" <6man@ietf.org>
References: <534D4F7A.3040605@cox.net> <CAH7SZV9WeQmuaHvUZ35_ySL4ak4+SDfbmpMbXgqQL+C833sTGw@mail.gmail.com> <1397607559.92815.YahooMailNeo@web120004.mail.ne1.yahoo.com> <CAP+sJUfx6=-22+A_=M_v3iSf6piGeyHkF2_BPm2ntbWnCEhTSw@mail.gmail.com> <CAMsDxWRgNoWdaRaZz=tOuWQ+ucCfFE7EnHxbbjBvBR64xoF_dQ@mail.gmail.com> <E045AECD98228444A58C61C200AE1BD842605A64@xmb-rcd-x01.cisco.com>
In-Reply-To: <E045AECD98228444A58C61C200AE1BD842605A64@xmb-rcd-x01.cisco.com>
X-Enigmail-Version: 1.5.2
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Archived-At: http://mailarchive.ietf.org/arch/msg/roll/4YMcIMKvwTo7U9gwYEGbCuKzK3E
X-Mailman-Approved-At: Thu, 17 Apr 2014 09:59:01 -0700
Cc: "6tisch@ietf.org" <6tisch@ietf.org>, Ines Robles <mariainesrobles@googlemail.com>, roll <roll@ietf.org>
Subject: Re: [Roll] [6tisch] Support of flow label to carry the RPL information in data packets
X-BeenThere: roll@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
Reply-To: Routing Over Low power and Lossy networks <roll@ietf.org>
List-Id: Routing Over Low power and Lossy networks <roll.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/roll>, <mailto:roll-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/roll/>
List-Post: <mailto:roll@ietf.org>
List-Help: <mailto:roll-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/roll>, <mailto:roll-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 17 Apr 2014 14:49:59 -0000

Hi, Pascal,

On 04/17/2014 11:27 AM, Pascal Thubert (pthubert) wrote:
> 
> Considering the support we have at 6TiSCH and ROLL for the work, I
> published draft-thubert-6man-flow-label-for-rpl-00.txt to the 6MAN WG.
> 
> The main discussion is probably to confirm whether our proposed use of
> the flow label inside the RPL domain is compatible with the goals that
> are achieved by RFC6437. Let us continue the discussion there from now on.

I just skimmed through the I-D. Two quick questions:

1) Does your document propose/require that the Flow Label be rewritten
by some border router? -- I ask because, at the time, there was strong
opposition to this.

2) Does the algorithm/scheme with which you'll rewrite the Flow-Label
lead to predictable sequences? And/or, would the resulting values have a
uniform distribution?

Thanks!

Best regards,
-- 
Fernando Gont
e-mail: fernando@gont.com.ar || fgont@si6networks.com
PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1