Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:SuggestedFragmentation/Reassemblytext
Bob Briscoe <ietf@bobbriscoe.net> Tue, 23 March 2021 22:58 UTC
Return-Path: <ietf@bobbriscoe.net>
X-Original-To: tsvwg@ietfa.amsl.com
Delivered-To: tsvwg@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 211683A18EF; Tue, 23 Mar 2021 15:58:27 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.433
X-Spam-Level:
X-Spam-Status: No, score=-1.433 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, NICE_REPLY_A=-0.001, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=bobbriscoe.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 Pna73_mYVLis; Tue, 23 Mar 2021 15:58:22 -0700 (PDT)
Received: from mail-ssdrsserver2.hosting.co.uk (mail-ssdrsserver2.hosting.co.uk [185.185.85.90]) (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 6A8AF3A18EB; Tue, 23 Mar 2021 15:58:22 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=bobbriscoe.net; s=default; h=Content-Type:In-Reply-To:MIME-Version:Date: Message-ID:From:References:Cc:To:Subject:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=OW6Uzrd0kuPvxhDwX4wDixbPKiN0e61opM5JfH6R2Rk=; b=VEJU+zjM5iV9JzBP4F7MbbvXV U/4W+HGlnTDq4PJVp0LuBV1H8FD6spVri45UUInWENM4nOQEnUVVwXkzO/EdLbWRAbJCqiesvguta nv/ZpCClZ0ErItNDkFDycn5QXgDtP/GzP4IfdTsW+Es8/PYw2HVfT/Y+mRg6saAuqqHyNOtCDD9rt LwsxLdB1IaZpXrtp3tTbI54nmcspgPZdhFKqsgbo77yqC3uj/omVleC2QQUTgxERwKRXDToZio3yz QL4A3ReBClIuCfmjoeXHA1vVdJKBhvoRH9YawLRN8489jRWJqE3yLX51W007v21EzwTJcJGrMmm+z s3/I188YA==;
Received: from 67.153.238.178.in-addr.arpa ([178.238.153.67]:52186 helo=[192.168.1.11]) by ssdrsserver2.hosting.co.uk with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94) (envelope-from <ietf@bobbriscoe.net>) id 1lOpyd-0003oh-7g; Tue, 23 Mar 2021 22:58:19 +0000
To: "Black, David" <David.Black@dell.com>, Jonathan Morton <chromatix99@gmail.com>
Cc: Markku Kojo <kojo@cs.helsinki.fi>, Joe Touch <touch@strayalpha.com>, Markku Kojo <kojo=40cs.helsinki.fi@dmarc.ietf.org>, "tsvwg-chairs@ietf.org" <tsvwg-chairs@ietf.org>, "tsvwg@ietf.org" <tsvwg@ietf.org>
References: <CE03DB3D7B45C245BCA0D243277949363076629A@MX307CL04.corp.emc.com> <CE03DB3D7B45C245BCA0D24327794936307662EA@MX307CL04.corp.emc.com> <1920ABCD-6029-4E37-9A18-CC4FEBBFA486@gmail.com> <CE03DB3D7B45C245BCA0D2432779493630768173@MX307CL04.corp.emc.com> <6D176D4A-C0A7-41BA-807A-5478D28A0301@strayalpha.com> <CE03DB3D7B45C245BCA0D24327794936307688C5@MX307CL04.corp.emc.com> <alpine.DEB.2.21.1911171041020.5835@hp8x-60.cs.helsinki.fi> <9024d91a-bb08-fb45-84f8-ce89ba90648d@bobbriscoe.net> <alpine.DEB.2.21.2012141735030.5844@hp8x-60.cs.helsinki.fi> <1e038b64-8276-3515-ac45-e0fc84e1c413@bobbriscoe.net> <alpine.DEB.2.21.2103081540280.3820@hp8x-60.cs.helsinki.fi> <3c778eb9-56dc-3d58-0de4-c6373d1090ec@bobbriscoe.net> <alpine.DEB.2.21.2103181233160.3820@hp8x-60.cs.helsinki.fi> <8ac0d6dd-1648-ee8d-d107-55ef7fe7695f@bobbriscoe.net> <CD5B98D1-9BAE-4B74-8751-A8AF293AEFC3@gmail.com> <MN2PR19MB4045C7AD9873F378FB542CF283659@MN2PR19MB4045.namprd19.prod.outlook.com>
From: Bob Briscoe <ietf@bobbriscoe.net>
Message-ID: <7908ba5b-49c3-09bc-d01e-53cba9f1b506@bobbriscoe.net>
Date: Tue, 23 Mar 2021 22:58:18 +0000
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1
MIME-Version: 1.0
In-Reply-To: <MN2PR19MB4045C7AD9873F378FB542CF283659@MN2PR19MB4045.namprd19.prod.outlook.com>
Content-Type: multipart/alternative; boundary="------------28389C2BB6489876A3E3AAD8"
Content-Language: en-GB
X-AntiAbuse: This header was added to track abuse, please include it with any abuse report
X-AntiAbuse: Primary Hostname - ssdrsserver2.hosting.co.uk
X-AntiAbuse: Original Domain - ietf.org
X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12]
X-AntiAbuse: Sender Address Domain - bobbriscoe.net
X-Get-Message-Sender-Via: ssdrsserver2.hosting.co.uk: authenticated_id: in@bobbriscoe.net
X-Authenticated-Sender: ssdrsserver2.hosting.co.uk: in@bobbriscoe.net
X-Source:
X-Source-Args:
X-Source-Dir:
Archived-At: <https://mailarchive.ietf.org/arch/msg/tsvwg/BorTyvKrDrM-oxP9nG5tiArwRgM>
Subject: Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:SuggestedFragmentation/Reassemblytext
X-BeenThere: tsvwg@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Transport Area Working Group <tsvwg.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tsvwg>, <mailto:tsvwg-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/tsvwg/>
List-Post: <mailto:tsvwg@ietf.org>
List-Help: <mailto:tsvwg-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tsvwg>, <mailto:tsvwg-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 23 Mar 2021 22:58:27 -0000
David, I'll reply to your response on the shim text here, and start a new thread for the encap draft, to keep this from growing too long... On 22/03/2021 22:00, Black, David wrote: > First, the good news - the reassembly text in Section 5 of rfc6040update-shim > draft looks good: > > Section 5.3 of [RFC3168] defines the process that a tunnel egress > follows to reassemble sets of outer fragments > [I-D.ietf-intarea-tunnels] into packets. > > During reassembly of outer fragments [I-D.ietf-intarea-tunnels], if > the ECN fields of the outer headers being reassembled into a single > packet consist of a mixture of Not-ECT and other ECN codepoints, the > packet MUST be discarded. > > If there is mix of ECT(0) and ECT(1) fragments, then the reassembled > packet MUST be set to either ECT(0) or ECT(1). In this case, > reassembly SHOULD take into account that the RFC series has so far > ensured that ECT(0) and ECT(1) can either be considered equivalent, > or they can provide 2 levels of congestion severity, where the > ranking of severity from highest to lowest is CE, ECT(1), ECT(0) > [RFC6040]. > > I would slightly rephrase the first paragraph as follows: > > Section 5.3 of [RFC3168] specifies ECN requirements for tunnel egress > reassembly of sets of outer fragments [I-D.ietf-intarea-tunnels] into IP packets > when at least one of the fragments is CE-marked. If none of the fragments > in a set to be reassembled is CE-marked, then the following two additional > requirements apply: [BB] I'm afraid that's incorrect. This requirements from RFC3168 covers cases other than those with at least one CE fragment: "Reassembly of a fragmented packet MUST NOT change the ECN codepoint when all of the fragments carry the same codepoint." To achieve what you want, I believe i just need to replace the first para with the following, then bullet paras 2 & 3: Section 5.3 of [RFC3168] specifies ECN requirements for reassembly of sets of outer fragments [I-D.ietf-intarea-tunnels] into packets. The following two additional requirements apply at a tunnel egress: Also, we agreed that we would not update RFC3168 here. This section starts by saying it updates RFC6040, so I've kept it to just that (my draft-13 text was wrong in this respect too). I've moved the words "...at a tunnel egress" so they confine the scope of this update to a tunnel egress, rather than incorrectly redefining the scope of RFC3168 (which is about reassembly anywhere, not just "...at a tunnel egress:") > > and then itemize the second and third paragraphs (e.g., number them 1. and 2.). > > The rationale for this rephrasing is that Section 5.3 of RFC 3168 does not specify > a process, but rather imposes requirements on what is allowed. I also believe > that this text the bulk of what's needed to address the reassembly comment > that's been holding up these drafts. > > --------------------------------- See new thread for the rest about ecn-encap... Bob -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/
- [tsvwg] draft-ietf-tsvwg-rfc6040update-shim: Sugg… Black, David
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim: … Jonathan Morton
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim: … Black, David
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim: … Joe Touch
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim: … Black, David
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim: … Jonathan Morton
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim: … Markku Kojo
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim: … Bob Briscoe
- [tsvwg] ecn-encap: (was: draft-ietf-tsvwg-rfc6040… Bob Briscoe
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim: … Jonathan Morton
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim: … Markku Kojo
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim: … Bob Briscoe
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:S… Markku Kojo
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:S… Bob Briscoe
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:S… Black, David
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:S… Markku Kojo
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:S… Bob Briscoe
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:S… Jonathan Morton
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:S… Black, David
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:S… Bob Briscoe
- [tsvwg] ecn-encap-guidelines reframing section Bob Briscoe
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:S… Black, David
- Re: [tsvwg] ecn-encap-guidelines reframing section Black, David
- Re: [tsvwg] ecn-encap-guidelines reframing section Bob Briscoe
- Re: [tsvwg] ecn-encap-guidelines reframing section Jonathan Morton
- Re: [tsvwg] ecn-encap-guidelines reframing section Jonathan Morton
- Re: [tsvwg] ecn-encap-guidelines reframing section Black, David
- Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:S… Markku Kojo
- Re: [tsvwg] ecn-encap-guidelines reframing section Markku Kojo
- Re: [tsvwg] ecn-encap-guidelines reframing section Markku Kojo