Re: [6lo] Barry Leiba's Discuss on draft-ietf-6lo-deadline-time-04: (with DISCUSS and COMMENT)

Charlie Perkins <charles.perkins@earthlink.net> Fri, 31 May 2019 02:37 UTC

Return-Path: <charles.perkins@earthlink.net>
X-Original-To: 6lo@ietfa.amsl.com
Delivered-To: 6lo@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 59888120048; Thu, 30 May 2019 19:37:38 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -3.115
X-Spam-Level:
X-Spam-Status: No, score=-3.115 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.415, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=earthlink.net; domainkeys=pass (2048-bit key) header.from=charles.perkins@earthlink.net header.d=earthlink.net
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 3WLW-_Wpp4hB; Thu, 30 May 2019 19:37:36 -0700 (PDT)
Received: from elasmtp-galgo.atl.sa.earthlink.net (elasmtp-galgo.atl.sa.earthlink.net [209.86.89.61]) (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 2D403120019; Thu, 30 May 2019 19:37:36 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=earthlink.net; s=dk12062016; t=1559270256; bh=OS+P0xHRchG/2kr+qQAOkW1X6mywkg62F+vj wsrMQPs=; h=Received:Subject:To:Cc:References:From:Message-ID:Date: User-Agent:MIME-Version:In-Reply-To:Content-Type: Content-Transfer-Encoding:Content-Language:X-ELNK-Trace: X-Originating-IP; b=nbFRYZ8/QzkaRdLuD2QCRSx4gtx3TWCTjeDIOIuuxdju+8 u1odeJ7wKXeV+Og5kh447yIe3nmQZYeDqo2rZV+xO6asv7yRceaCKhLAslT0a2UYU5u v9wNSgNod58vNdliJukLRHdxgWWpmed7Bqg3KaxT2E+5WusZ/Bpksic835PrmZ31JXP o/jarfIWAbPOvKDPqnPacsyC4Y67iQdtzQWD8Kz6TGcAeUV73MaulfbslUZJHita9hu 0R+EYWhfUIS9MlbjRk939Obqo6gDSz5oVlXu98X6ZWYyYC/UGN27z1OgJb158PLL/B5 rtOSTBqNJ4PMYBzde2noiXULslug==
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk12062016; d=earthlink.net; b=fA3R2f4HsDOuoKH3rgKhqfsbS4QPjCD+/AW2HfoLdwdoSJTXqfZnmY9kz9YrFIjPvvoavIEL6j+ZI3bo8YO4Dh+0UOT7EpVS8H5Mo9gewWhs93doD11LUOfvSRIXnGEDzJTgt32R7qvcaJDem0XDYgXYJET8V9gwHaopjeKE4jBMV8xwNHkY/lVlTqAkonui8XKi8OA/D3dKa51vz/BS+LDjFaU7YiT03c852EEDOs/J+NUsjj6Q2Qw0LNqm4Lxk6ylYTom59aGYLy7V/DQZI7eapfYNFwFbUnBCz2b5+WKvLAM0KsHgFxa5HXFofWyTYLcGaggiP0RcptGJd4Cr7A==; h=Received:Subject:To:Cc:References:From:Message-ID:Date:User-Agent:MIME-Version:In-Reply-To:Content-Type:Content-Transfer-Encoding:Content-Language:X-ELNK-Trace:X-Originating-IP;
Received: from [99.51.72.196] (helo=[192.168.1.82]) by elasmtp-galgo.atl.sa.earthlink.net with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4) (envelope-from <charles.perkins@earthlink.net>) id 1hWXQD-000450-E5; Thu, 30 May 2019 22:37:33 -0400
To: Carsten Bormann <cabo@tzi.org>
Cc: Barry Leiba <barryleiba@computer.org>, The IESG <iesg@ietf.org>, draft-ietf-6lo-deadline-time@ietf.org, 6lo-chairs@ietf.org, Samita Chakrabarti <samitac.ietf@gmail.com>, Shwetha Bhandari <shwethab@cisco.com>, 6lo@ietf.org
References: <155766926695.31687.17410585533455050681.idtracker@ietfa.amsl.com> <5D48BA8F-7AB3-46B1-8558-0D8CE88CC420@tzi.org>
From: Charlie Perkins <charles.perkins@earthlink.net>
Message-ID: <5c6f67b6-089d-a417-d1c7-323eb4a3456b@earthlink.net>
Date: Thu, 30 May 2019 19:37:28 -0700
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0
MIME-Version: 1.0
In-Reply-To: <5D48BA8F-7AB3-46B1-8558-0D8CE88CC420@tzi.org>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
Content-Language: en-US
X-ELNK-Trace: 137d7d78656ed6919973fd6a8f21c4f2d780f4a490ca6956846b590522b13c95516f9391cc5cedfd5048824a2d3af4ba350badd9bab72f9c350badd9bab72f9c
X-Originating-IP: 99.51.72.196
Archived-At: <https://mailarchive.ietf.org/arch/msg/6lo/yyku_iqsn0dqVherY3IiTxDD0-w>
Subject: Re: [6lo] Barry Leiba's Discuss on draft-ietf-6lo-deadline-time-04: (with DISCUSS and COMMENT)
X-BeenThere: 6lo@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "Mailing list for the 6lo WG for Internet Area issues in IPv6 over constrained node networks." <6lo.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/6lo>, <mailto:6lo-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/6lo/>
List-Post: <mailto:6lo@ietf.org>
List-Help: <mailto:6lo-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/6lo>, <mailto:6lo-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 31 May 2019 02:37:38 -0000

Hello Carsten,

Thanks for pointing out that typo.  The expressions should have been 
"4..64-bit" in both cases.  It's amazing how often we can look at the 
text and still miss obvious mistakes.

Regards,
Charlie P.


On 5/12/2019 11:49 AM, Carsten Bormann wrote:
> On May 12, 2019, at 15:54, Barry Leiba via Datatracker <noreply@ietf.org> wrote:
>> Why is DTL the length *minus 1*?  Doesn’t that invite mistakes?  Is there a
>> reason not to make it the length, and to say that 0 is not a valid value?
> Fundamentally, a small integer encoded into a bitfield is best encoded as a value starting from 0, instead of creating holes at the bottom *and* the top.  Also, in this case, the 4-bit value encoding DTL can be between 0 and 15, so the length in bits could be 0 to 60, which is not enough for 64 bits.
> So adding one sounds fine, even if you believe holes are good.
>
> But then, I don’t understand why both DT and OTD are said to be “8..64” bits — that needs 15 possible values, not 16; OTL has only 3 bits (which cannot express 15 possible values, which are probably not needed anyway), and the example for OTL has a DT of 4 bits.
>
> Grüße, Carsten
>
>