Re: [tcpm] timestamp options (was Re: New Version Notification for draft-touch-tcpm-tcp-edo-01.txt)

Joe Touch <touch@isi.edu> Mon, 02 June 2014 18:12 UTC

Return-Path: <touch@isi.edu>
X-Original-To: tcpm@ietfa.amsl.com
Delivered-To: tcpm@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 02C8A1A0380 for <tcpm@ietfa.amsl.com>; Mon, 2 Jun 2014 11:12:28 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.551
X-Spam-Level:
X-Spam-Status: No, score=-2.551 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RP_MATCHES_RCVD=-0.651] 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 fEqS96MHnH0i for <tcpm@ietfa.amsl.com>; Mon, 2 Jun 2014 11:12:27 -0700 (PDT)
Received: from darkstar.isi.edu (darkstar.isi.edu [128.9.128.127]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1B8AC1A0337 for <tcpm@ietf.org>; Mon, 2 Jun 2014 11:12:27 -0700 (PDT)
Received: from [192.168.1.93] (pool-71-105-87-112.lsanca.dsl-w.verizon.net [71.105.87.112]) (authenticated bits=0) by darkstar.isi.edu (8.13.8/8.13.8) with ESMTP id s52IBsVB018224 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Mon, 2 Jun 2014 11:11:57 -0700 (PDT)
Message-ID: <538CBE6C.2030700@isi.edu>
Date: Mon, 02 Jun 2014 11:11:56 -0700
From: Joe Touch <touch@isi.edu>
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0
MIME-Version: 1.0
To: "Scharf, Michael (Michael)" <michael.scharf@alcatel-lucent.com>, "mallman@icir.org" <mallman@icir.org>
References: <5384EFC3.50803@isi.edu> <20140602175057.1216F780B80@lawyers.icir.org> <655C07320163294895BBADA28372AF5D31326E@FR712WXCHMBA15.zeu.alcatel-lucent.com>
In-Reply-To: <655C07320163294895BBADA28372AF5D31326E@FR712WXCHMBA15.zeu.alcatel-lucent.com>
Content-Type: text/plain; charset="ISO-8859-1"; format="flowed"
Content-Transfer-Encoding: 7bit
X-ISI-4-43-8-MailScanner: Found to be clean
X-MailScanner-From: touch@isi.edu
Archived-At: http://mailarchive.ietf.org/arch/msg/tcpm/kO_OgdkZZQkM19iwf1NsgIiRXzw
Cc: "tcpm@ietf.org" <tcpm@ietf.org>
Subject: Re: [tcpm] timestamp options (was Re: New Version Notification for draft-touch-tcpm-tcp-edo-01.txt)
X-BeenThere: tcpm@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: TCP Maintenance and Minor Extensions Working Group <tcpm.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tcpm>, <mailto:tcpm-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/tcpm/>
List-Post: <mailto:tcpm@ietf.org>
List-Help: <mailto:tcpm-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tcpm>, <mailto:tcpm-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 02 Jun 2014 18:12:28 -0000


On 6/2/2014 11:08 AM, Scharf, Michael (Michael) wrote:
>> Also, I'd like to know if OSes actually do consult the TS value in the
>> 3WHS to try to hunt for old packets.  I have no idea.  Does anyone
>> know?
>> (Either answer wouldn't surprise me, actually.)
>
> Well, I don't know.
>
> But a related thought: In 1323bis we actually mention a random,
> per-connection offset. Such a logic in the 3WHS would have to take
> different offsets into account, right?

Offsets should always move the clock forward; if they don't - if one 
offset is smaller than another for the same port pair - then 1323bis got 
it wrong.

Joe