IETF Logo Mail Archive

Re: [tcpm] draft-ietf-tcpm-converters

<mohamed.boucadair@orange.com> Mon, 17 June 2019 06:11 UTC

Return-Path: <mohamed.boucadair@orange.com>
X-Original-To: tcpm@ietfa.amsl.com
Delivered-To: tcpm@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 714001200D6 for <tcpm@ietfa.amsl.com>; Sun, 16 Jun 2019 23:11:04 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.599
X-Spam-Level:
X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no
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 0KQZ6AGBox9K for <tcpm@ietfa.amsl.com>; Sun, 16 Jun 2019 23:11:02 -0700 (PDT)
Received: from orange.com (mta135.mail.business.static.orange.com [80.12.70.35]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5FBF812007A for <tcpm@ietf.org>; Sun, 16 Jun 2019 23:11:02 -0700 (PDT)
Received: from opfednr00.francetelecom.fr (unknown [xx.xx.xx.64]) by opfednr23.francetelecom.fr (ESMTP service) with ESMTP id 45S16r0Dhtz5yWj; Mon, 17 Jun 2019 08:11:00 +0200 (CEST)
Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.104]) by opfednr00.francetelecom.fr (ESMTP service) with ESMTP id 45S16q6L5VzDq7y; Mon, 17 Jun 2019 08:10:59 +0200 (CEST)
Received: from OPEXCAUBMA2.corporate.adroot.infra.ftgroup ([fe80::e878:bd0:c89e:5b42]) by OPEXCAUBM5F.corporate.adroot.infra.ftgroup ([fe80::193b:bc32:1ad3:362d%21]) with mapi id 14.03.0439.000; Mon, 17 Jun 2019 08:10:59 +0200
From: mohamed.boucadair@orange.com
To: "Scharf, Michael" <Michael.Scharf@hs-esslingen.de>, "draft-ietf-tcpm-converters@ietf.org" <draft-ietf-tcpm-converters@ietf.org>
CC: "tcpm@ietf.org Extensions" <tcpm@ietf.org>
Thread-Topic: draft-ietf-tcpm-converters
Thread-Index: AdUkHWlwWAVA12efRnCFBwL9n6nkWAArZURg
Date: Mon, 17 Jun 2019 06:10:59 +0000
Message-ID: <787AE7BB302AE849A7480A190F8B93302EAA7AD7@OPEXCAUBMA2.corporate.adroot.infra.ftgroup>
References: <6EC6417807D9754DA64F3087E2E2E03E2D336687@rznt8114.rznt.rzdir.fht-esslingen.de>
In-Reply-To: <6EC6417807D9754DA64F3087E2E2E03E2D336687@rznt8114.rznt.rzdir.fht-esslingen.de>
Accept-Language: fr-FR, en-US
Content-Language: fr-FR
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [10.114.13.247]
Content-Type: multipart/alternative; boundary="_000_787AE7BB302AE849A7480A190F8B93302EAA7AD7OPEXCAUBMA2corp_"
MIME-Version: 1.0
Archived-At: <https://mailarchive.ietf.org/arch/msg/tcpm/Qu2rTeniM2tLiix1vTacK4Vgdzs>
Subject: Re: [tcpm] draft-ietf-tcpm-converters
X-BeenThere: tcpm@ietf.org
X-Mailman-Version: 2.1.29
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: <https://mailarchive.ietf.org/arch/browse/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, 17 Jun 2019 06:11:04 -0000

Hi Michael,

Please see inline.

Cheers,
Med

De : Scharf, Michael [mailto:Michael.Scharf@hs-esslingen.de]
Envoyé : dimanche 16 juin 2019 10:28
À : draft-ietf-tcpm-converters@ietf.org
Cc : tcpm@ietf.org Extensions
Objet : draft-ietf-tcpm-converters

Hi all,

In preparation of a planned WGLC (heads-up to all) I have read draft-ietf-tcpm-converters-07 again.

As a result, I have two further questions (as individual contributor, if that matters). Ideally I should have already noted when reading the document last time…

1/ The handling of the three-way handshake is well specified in the document, and this is what the convert protocol is about. Yet, I really wonder if some words are needed on what the endpoints can expect from the converter once the connection is established? In section 1, the document specifies that the converters „relay control messages and data between the client and the server“. While I believe most of us have an idea what this means, I wonder if it is formally clear what that implies for acknowledgements and connection management (e.g., FIN, RST, keepalives). For instance, if the client receives an ACK for a segment with FIN flag, can the client assume that the server has received a FIN from the converter and that the converter has received an ACK from the Server for that FIN? My understanding is that a converter is not required to guarantee these end-to-end semantics. If that is true, wouldn’t it be better to be explicit about that? This may also relate to what happens in case of failures inside the converter.

[Med] We can add some details if you thnk this is useful. A first attempt to address your comment is available at: https://github.com/obonaventure/draft-tcp-converters/pull/60/files. We will further tweak the text and release a new revision soon.

2/ The document uses the term „TCP extended header“, e.g. on page 10 and 23. As far as I know, we typically don’t use this term for the standard TCP header, either with or without options. draft-ietf-tcpm-tcp-edo uses a similar term, but as far as I understand the converter protocol does not rely on EDO. Wouldn’t it be more reasonable to replace „TCP extended header“ by a more common term, e.g. by „TCP header“?

[Med] Will be fixed.

Thanks

Michael

v2.23.0 | Report a Bug | By Email