From nobody Sun Mar 1 13:04:57 2020 Return-Path: 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 C9B293A0870; Sun, 1 Mar 2020 13:04:54 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.622 X-Spam-Level: X-Spam-Status: No, score=-1.622 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, KHOP_HELO_FCRDNS=0.276, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=no 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 CoyeroBshqBr; Sun, 1 Mar 2020 13:04:52 -0800 (PST) Received: from drew.franken.de (mail-n.franken.de [193.175.24.27]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F081E3A0850; Sun, 1 Mar 2020 13:04:51 -0800 (PST) Received: from [IPv6:2a02:8109:1140:c3d:16d:83a6:11e5:aaf8] (unknown [IPv6:2a02:8109:1140:c3d:16d:83a6:11e5:aaf8]) (Authenticated sender: lurchi) by mail-n.franken.de (Postfix) with ESMTPSA id DF847721E282F; Sun, 1 Mar 2020 22:04:47 +0100 (CET) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3608.60.0.2.5\)) From: Michael Tuexen In-Reply-To: Date: Sun, 1 Mar 2020 22:04:45 +0100 Cc: "Scharf, Michael" , "draft-ietf-tcpm-rack@ietf.org" , tcpm IETF list Content-Transfer-Encoding: quoted-printable Message-Id: <47402EB9-5B9C-428D-8202-D4925AB5C699@lurchi.franken.de> References: <6EC6417807D9754DA64F3087E2E2E03E2D8DBCE1@rznt8114.rznt.rzdir.fht-esslingen.de> To: Yuchung Cheng X-Mailer: Apple Mail (2.3608.60.0.2.5) Archived-At: Subject: Re: [tcpm] draft-ietf-tcpm-rack - editorial impact of target PS X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Mar 2020 21:04:55 -0000 > On 21. Jan 2020, at 19:03, Yuchung Cheng = wrote: >=20 > On Sun, Jan 19, 2020 at 1:51 PM Scharf, Michael > wrote: >>=20 >> Hi all, >>=20 >> I briefly scanned through draft-ietf-tcpm-rack-07 regarding the = impact of the new target as PS. >>=20 >> This e-mail is only about editorial and formal issues. Note that I am = not the responsible chair for this document. >>=20 >> Questions: >>=20 >> * Metadata: Does the document update other RFCs (such as RFC 5681)? = My current thinking is that the answer is "no", but I want to = cross-check. As the document now targets PS, it theoretically could = update other RFCs. If the document does not update other RFCs, maybe it = needs to explain this and the reason for not doing it somewhere? I don't think that this document updates any other RFC. >>=20 >> * Abstract: "It is intended to replace the conventional DUPACK = threshold approach and its variants, as well as other nonstandard = approaches." >>=20 >> I am not sure if the word "replace" could be a formal issue, in = particular if other RFCs are not updated by this document (see previous = comment). Another wording that may work around this question could e.g. = be "it is intended to be an alternative to the conventional DUPACK = threshold". Do others in the working group have any opinion on that = wording (in particular native speakers)? >>=20 >> The same question applies to later use of the word "replace". > I am fine with other wordings except I don't have a better one. What about using: It is intended to supplement the conventional DUPACK threshold approach = and its variants, as well as other nonstandard approaches. >=20 >>=20 >> * Section 4: >>=20 >> "This document provides a concrete and detailed reordering window >> adaptation algorithm for implementers. We note that the specifics = of >> the algorithm are likely to evolve over time. But that is a = separate >> engineering optimization that's out of scope for this document." >>=20 >> This could be understood as an experiment... Thus, I am not sure if = this wording will pass an IETF last call on standards track. I wonder if = this could be reworded to something along the lines of ... >=20 >>=20 >> "This document provides a concrete and detailed reordering window >> adaptation algorithm as a standard solution that is safe to use. >> Implementers have to aware that engineering optimization of >> the algorithm are possible." > how about we just get rid of the paragraph completely since TCP will > evolve no matter what. I agree with removing the paragraph. >=20 >>=20 >> Section 8.4 >>=20 >> "Nevertheless RACK is still an experimental algorithm. Since the >> oldest loss detection algorithm, the 3 duplicate ACK threshold >> [RFC5681], has been standardized and widely deployed. RACK can >> easily and optionally support the conventional approach for >> compatibility." >>=20 >> The first sentence probably should be removed. I don't really = understand the second sentence. And wouldn't it make sense to better = emphasize the "compatibility" earlier in the document, say, in the = intro? > s.g. +1 on removing first sentence Please remove the first sentence. The second one might be reformulated = to make clear that the 3 dup ack algorithm is somewhat integrated. >>=20 >> Thanks >>=20 >> Michael (with no hat) Same for me... Best regards Michael >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm From nobody Mon Mar 2 06:58:53 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B1BD83A0830; Mon, 2 Mar 2020 06:58:47 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: =?utf-8?q?=C3=89ric_Vyncke_via_Datatracker?= To: "The IESG" Cc: draft-ietf-tcpm-converters@ietf.org, tcpm-chairs@ietf.org, tcpm@ietf.org, Michael Scharf , michael.scharf@hs-esslingen.de X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: =?utf-8?q?=C3=89ric_Vyncke?= Message-ID: <158316112770.27414.3186724146499309840@ietfa.amsl.com> Date: Mon, 02 Mar 2020 06:58:47 -0800 Archived-At: Subject: [tcpm] =?utf-8?q?=C3=89ric_Vyncke=27s_Discuss_on_draft-ietf-tcpm?= =?utf-8?q?-converters-17=3A_=28with_DISCUSS_and_COMMENT=29?= X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Mar 2020 14:58:48 -0000 Éric Vyncke has entered the following ballot position for draft-ietf-tcpm-converters-17: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- Thank you for the work put into this document. It is indeed useful to be able to deploy easily new TCP features. Nevertheless, please find below two DISCUSSes and some non-blocking COMMENTs (and I would appreciate a response from the authors) and NITS. I hope that this helps to improve the document, Regards, -éric == DISCUSS == -- Section 1.2 -- A trivial one: while the title and the abstract of this document appear as quite generic, the document focus is reduced later in section 1.2 to MPTCP: "this document specifies how the Convert Protocol applies for Multipath TCP. It is out of scope of this document to provide a comprehensive list of all potential conversion services. " While I do not mind having a focus on MPTCP only, I would strongly suggest to reflect this focus in the title and in the abstract (the current filename is correct). -- Section 6.2.8 -- I appreciate that this is an experimental document, but, having only 2 occurrences of ICMP in the whole document and no real "how to process" TLV "Destination Unreachable"... and the payload of this TLV having only the code without the offending packet will probably make Path MTU discovery (and other mechanisms) impossible. While I am not a transport expert, I believe that this aspect needs to be described in this document. ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Here are some COMMENTs -- Section 1.2 -- Is the benefit of a transport proxy only for the clients as written in the 1st paragraph? It was probably the case for the original MPTCP proxy but what about other TCP extensions? -- Section 4.1 -- While the difference "(Internet-facing interface, customer-facing interface)" will probably represent the vast majority of use cases, I wonder whether there will always be a single Internet-facing ? Could probably be 0 or 2 in some use cases... Suggest to remove this part of the text. -- Section 6.1 -- Please state the usual wording about "unassigned" field: it must be ignored by the receiver. Adding some explanations on why version 0 is reserved but cannot be used would be welcome. -- Section 6.2.5 -- Can the "remote peer IP address" be a link-local address ? == NITS == -- Section 1.1 (and possibly others) -- Please use a consistent means of introducing acronyms, cfr URLLC and ATSSS ;-) -- Section 4.2 --- The use of "regular TCP packets" makes me wonder whether the authors think that MPTCP uses "irregular TCP packets"... The use of 'regular' seems a little weird here but I am not a native English speaker. -- Section 4.3 -- The caption below figure 7 ends with "(TCP)" that is not the acronym of "Transport Session Entry". Is it expected ? From nobody Mon Mar 2 07:18:50 2020 Return-Path: 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 439BF3A08C2; Mon, 2 Mar 2020 07:18:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=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 dC2iQovSZ-3C; Mon, 2 Mar 2020 07:18:42 -0800 (PST) Received: from wp513.webpack.hosteurope.de (wp513.webpack.hosteurope.de [IPv6:2a01:488:42:1000:50ed:8223::]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5431C3A08C0; Mon, 2 Mar 2020 07:18:42 -0800 (PST) Received: from p200300dee7239a00fcc74dc47cb342f6.dip0.t-ipconnect.de ([2003:de:e723:9a00:fcc7:4dc4:7cb3:42f6]); authenticated by wp513.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) id 1j8mq7-000222-KT; Mon, 02 Mar 2020 16:18:39 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: Mirja Kuehlewind In-Reply-To: <158316112770.27414.3186724146499309840@ietfa.amsl.com> Date: Mon, 2 Mar 2020 16:18:38 +0100 Cc: The IESG , draft-ietf-tcpm-converters@ietf.org, tcpm@ietf.org, michael.scharf@hs-esslingen.de, tcpm-chairs@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <1A105F7D-383C-4CC2-A050-F3075455938E@kuehlewind.net> References: <158316112770.27414.3186724146499309840@ietfa.amsl.com> To: =?utf-8?Q?=C3=89ric_Vyncke?= X-Mailer: Apple Mail (2.3445.104.11) X-bounce-key: webpack.hosteurope.de;ietf@kuehlewind.net;1583162322;1c34fe34; X-HE-SMSGID: 1j8mq7-000222-KT Archived-At: Subject: Re: [tcpm] =?utf-8?q?=C3=89ric_Vyncke=27s_Discuss_on_draft-ietf-tcpm?= =?utf-8?q?-converters-17=3A_=28with_DISCUSS_and_COMMENT=29?= X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Mar 2020 15:18:45 -0000 Hi Eric, Just on your first discuss comment. This document was initial proposed = in MPTCP and then moved to tcpm as a generic mechanism. Use of a = converter does not make sense for all TCP options but in other cases = than MPTCP it is also often quite straight forward. I would prefer to = keep it generic in the abstract and especially title because that the = intention. Mirja > On 2. Mar 2020, at 15:58, =C3=89ric Vyncke via Datatracker = wrote: >=20 > =C3=89ric Vyncke has entered the following ballot position for > draft-ietf-tcpm-converters-17: Discuss >=20 > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut = this > introductory paragraph, however.) >=20 >=20 > Please refer to = https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. >=20 >=20 > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/ >=20 >=20 >=20 > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- >=20 > Thank you for the work put into this document. It is indeed useful to = be able > to deploy easily new TCP features. >=20 > Nevertheless, please find below two DISCUSSes and some non-blocking = COMMENTs > (and I would appreciate a response from the authors) and NITS. >=20 > I hope that this helps to improve the document, >=20 > Regards, >=20 > -=C3=A9ric >=20 > =3D=3D DISCUSS =3D=3D >=20 > -- Section 1.2 -- > A trivial one: while the title and the abstract of this document = appear as > quite generic, the document focus is reduced later in section 1.2 to = MPTCP: > "this > document specifies how the Convert Protocol applies for Multipath > TCP. It is out of scope of this document to provide a comprehensive > list of all potential conversion services. " > While I do not mind having a focus on MPTCP only, I would strongly = suggest to > reflect this focus in the title and in the abstract (the current = filename is > correct). >=20 > -- Section 6.2.8 -- > I appreciate that this is an experimental document, but, having only 2 > occurrences of ICMP in the whole document and no real "how to process" = TLV > "Destination Unreachable"... and the payload of this TLV having only = the code > without the offending packet will probably make Path MTU discovery = (and other > mechanisms) impossible. >=20 > While I am not a transport expert, I believe that this aspect needs to = be > described in this document. >=20 >=20 > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- >=20 > Here are some COMMENTs > -- Section 1.2 -- > Is the benefit of a transport proxy only for the clients as written in = the 1st > paragraph? It was probably the case for the original MPTCP proxy but = what about > other TCP extensions? >=20 > -- Section 4.1 -- > While the difference "(Internet-facing interface, customer-facing = interface)" > will probably represent the vast majority of use cases, I wonder = whether there > will always be a single Internet-facing ? Could probably be 0 or 2 in = some use > cases... Suggest to remove this part of the text. >=20 > -- Section 6.1 -- > Please state the usual wording about "unassigned" field: it must be = ignored by > the receiver. >=20 > Adding some explanations on why version 0 is reserved but cannot be = used would > be welcome. >=20 > -- Section 6.2.5 -- > Can the "remote peer IP address" be a link-local address ? >=20 > =3D=3D NITS =3D=3D >=20 > -- Section 1.1 (and possibly others) -- > Please use a consistent means of introducing acronyms, cfr URLLC and = ATSSS ;-) >=20 > -- Section 4.2 --- > The use of "regular TCP packets" makes me wonder whether the authors = think that > MPTCP uses "irregular TCP packets"... The use of 'regular' seems a = little weird > here but I am not a native English speaker. >=20 > -- Section 4.3 -- > The caption below figure 7 ends with "(TCP)" that is not the acronym = of > "Transport Session Entry". Is it expected ? >=20 >=20 >=20 >=20 From nobody Mon Mar 2 11:35:45 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 044563A0FD8; Mon, 2 Mar 2020 11:35:28 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Christian Huitema via Datatracker To: Cc: tcpm@ietf.org, last-call@ietf.org, draft-ietf-tcpm-converters.all@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158317772769.27426.13946461846667728243@ietfa.amsl.com> Reply-To: Christian Huitema Date: Mon, 02 Mar 2020 11:35:28 -0800 Archived-At: Subject: [tcpm] Secdir last call review of draft-ietf-tcpm-converters-17 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Mar 2020 19:35:36 -0000 Reviewer: Christian Huitema Review result: Not Ready I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. In my opinion, this draft is not ready. The convert protocol enables clients to use a TCP proxy in an attempt to obtain better performance than on a direct connection between client and server. It is an alternative to the SOCKS 5 protocol. The client is configured with IP address of the proxy. Instead of establishing a direct connection to the server, it will establish a a "convert" connection to the proxy and proceed with an initial exchange according to the "convert" protocol. The proxy will then relay the connection to the server. I have doubts about the security properties of the proposed protocol, and in particular the weakness of the client authentication and the lack of proxy authentication. I also have reservations about the amount of quasi-marketing material in the lengthy introduction sections, and I would like to see more clarity on the management implications of address-rewriting scenarios. The client has to trust the proxy to correctly relay the connection, and also to not abuse its intermediate position and collect metadata or clear text data when relaying the TCP connections. The proxy has to make sure that it is only used by authorised clients. From the introduction, we infer that the protocol is meant to be deployed in constrained network, such as cellular network. The proxy would be deployed by the operator of the cellular network, which also provides the connectivity to the client. The privacy and security issues mostly arise when the client is connected to several networks, such as cellular and Wi-Fi. If the client is solely connected through the cellular network, the proxy is not obtaining any metadata or clear text data that would not be already observable by the network, and the proxy can verify that it is only used by authorized cellular network subscribers. However, the emphasis on providing TCP multipath between client and proxy let me think that the service is not restricted to just one network. I have some serious doubts about the security properties of the "convert" protocol. The protocol operates by configuring the IP address of the proxy in the clients. The protocol includes the possibility to authenticate a client by sending a clear text cookie when setting up the connection between client and proxy. This has all the (lack of) security of authentication with clear text passwords. The cookie can be observed if the client initiates a connection from outside the network controlled by the network operator, for example from a Wi-Fi hotspot. The protocol does not provides means for the client to authenticate the proxy. This is problematic, because the IP address of the proxy is statically configured. We have to assume that the proxy addresses can be disccovered by third parties. A client might try to issue a proxy connection from an unmanaged network. An attacker might arrange that packets bound to the proxy's IP are delivered to a system under the attacker's control, allowing the attacker to behave as a man-in-the-middle (MITM). The attacker could then observe the client's traffic and mount a variety of attacks. I think these security issues must be addressed before the draft is published. I understand that the authors may not want to develop a full security solution for what is presented as an experiment. Since this experimental draft describes a system designed for a close environment such as a cellular network, one way to address the issue would be to limit the use of the proxy service to addresses issued by the cellular network. This should be detailed in the security section. The introduction of the draft contains a long explanation describing what the authors perceive as "the problem". A lot of that looks like marketing material extollling the beauty of inserting TCP proxies in the communication path. The authors are of course entitled to their opinions, but the introduction presents opinions as facts, and publishing that as an RFC seems to assert that there is IETF consensus on these opinions. This is far from true. The draft justifies inserting proxies by explaining that it takes a long time for servers and clients to deploy the latest extensions to TCP, but experience shows that deployment is slowed when old network proxies do not support these extensions. Moreover, the draft asserts that the clients can benefit from using TCP extensions before they are deployed on the server, because the connections between them and the proxy can use these extensions. This is a rather questionable statement. For example, TCP multipath enables a connection to survive the loss of one of the paths between client and server by moving traffic to an alternate path. It is not clear at all that using an alternate path between a client and a proxy provides the same benefits. The draft would benefit from either presenting discussing enhancements versus ossification, and acknowledging that in most cases a direct connection between client and server provides better services than a connection mediated by a proxy. Or, if the authors do not want to say that, they could make the draft shorter and easier to read by removing most of the material in section 1 and 2, and simply stating that they present here a protocol for interacting with proxies that they think is superior to Socks 5. The presentation of the protocol only starts after 20 pages of introduction. Reducing that long presentation to 3 or 4 pages would markedly improve readability. When a client uses a proxy, the server will normally see the TCP connection as originating from the source address of a proxy. The draft supports that mode of operation, as explained in sections 4.3 and 4.4. There is a direct security implication here, because the client cannot be tracked by IP address. On one hand this may improve a client's privacy, but on the other hand this creates a management problem similar to that encountered with carrier grade NAT (CGN). In practice, network managers have to be able to identify the client who originated a specific TCP connection. For CGN, that translates into onerous logging requirements. This should be discussed in the security section. 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"tcpm@ietf.org" , Michael Scharf Thread-Topic: =?utf-8?B?w4lyaWMgVnluY2tlJ3MgRGlzY3VzcyBvbiBkcmFmdC1pZXRmLXRjcG0tY29u?= =?utf-8?Q?verters-17:_(with_DISCUSS_and_COMMENT)?= Thread-Index: AQHV8KMVSXlWtT5BgkaFkfNQ++7N1ag1f3Aw Date: Tue, 3 Mar 2020 08:02:10 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93303145D56F@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> References: <158316112770.27414.3186724146499309840@ietfa.amsl.com> In-Reply-To: <158316112770.27414.3186724146499309840@ietfa.amsl.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [tcpm] =?utf-8?q?=C3=89ric_Vyncke=27s_Discuss_on_draft-ietf-tcpm?= =?utf-8?q?-converters-17=3A_=28with_DISCUSS_and_COMMENT=29?= X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group 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RW50cnkiLiBJcyBpdCBleHBlY3RlZCA/DQoNCltNZWRdIERlbGV0ZWQsIHRoYW5rcy4NCg0KV2Ug dXNlZCB0byBoYXZlIGFub3RoZXIgZXhhbXBsZSB3aXRoIE1QVENQIHNwZWNpZmljcyBoZW5jZSB0 aGF0IG1lbnRpb24uIA0KDQoNCg== From nobody Tue Mar 3 01:27:08 2020 Return-Path: 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 CD0B23A109C; Tue, 3 Mar 2020 01:27:01 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com 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 YSn1wYoduLhC; Tue, 3 Mar 2020 01:26:59 -0800 (PST) Received: from relais-inet.orange.com (relais-inet.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 1FDC93A1021; Tue, 3 Mar 2020 01:26:59 -0800 (PST) Received: from opfednr07.francetelecom.fr (unknown [xx.xx.xx.71]) by opfednr26.francetelecom.fr (ESMTP service) with ESMTP id 48Ws8w4gGcz10F4; Tue, 3 Mar 2020 10:26:56 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1583227616; bh=lpnzs+HchGbqbp8kdVrXrgi8hqcNZPGH9e5NtZHFBvc=; h=From:To:Subject:Date:Message-ID:Content-Type: Content-Transfer-Encoding:MIME-Version; b=IyBNSyTD6TlUcAk0qZXbxCI5SH5hr3O80VRHOryTMsZ1CBZ79U5ccSdUZYWJ5rikY ZBiN0NA7Fx1Og57ck25/4FZlPcuun5iGSHjDAO8i37eadTuaQZfgGCTHjjgPqSmr2x xliHHeIKnbwWXHweyMq2efAHdTfzCXUL5CuBBnFVXBA5nJPTQ6w9mdlgG63YMpL24K taS9mdGBHQltPCOMz6Jp6wG6suuFbnzdpPxGm/aDK51+DTZlFq+AmAfdQ+yS/HMnAJ ZgEdXNmKNo/FqDGS6mSQD6g/mq3bQMDQR1s8CKlz7OnyvU6Ko/E+4mblkNBcV9A5Ue TJr5PsusO+o5Q== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.54]) by opfednr07.francetelecom.fr (ESMTP service) with ESMTP id 48Ws8w3NYBzFpXL; Tue, 3 Mar 2020 10:26:56 +0100 (CET) Received: from OPEXCAUBMA2.corporate.adroot.infra.ftgroup ([fe80::e878:bd0:c89e:5b42]) by OPEXCAUBM7D.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0487.000; Tue, 3 Mar 2020 10:26:56 +0100 From: To: Christian Huitema , "secdir@ietf.org" CC: "tcpm@ietf.org" , "last-call@ietf.org" , "draft-ietf-tcpm-converters.all@ietf.org" Thread-Topic: Secdir last call review of draft-ietf-tcpm-converters-17 Thread-Index: AQHV8MnAn6rFgEwPTkmnFRtjTvxbCKg2gvew Date: Tue, 3 Mar 2020 09:26:55 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93303145D64E@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> References: <158317772769.27426.13946461846667728243@ietfa.amsl.com> In-Reply-To: <158317772769.27426.13946461846667728243@ietfa.amsl.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [tcpm] Secdir last call review of draft-ietf-tcpm-converters-17 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 Mar 2020 09:27:02 -0000 SGkgQ2hyaXN0aWFuLA0KDQpUaGFuayB5b3UgZm9yIHRoZSByZXZpZXcuIA0KDQpQbGVhc2Ugc2Vl IGlubGluZS4gDQoNCkNoZWVycywNCk1lZA0KDQo+IC0tLS0tTWVzc2FnZSBkJ29yaWdpbmUtLS0t LQ0KPiBEZcKgOiBDaHJpc3RpYW4gSHVpdGVtYSB2aWEgRGF0YXRyYWNrZXIgW21haWx0bzpub3Jl cGx5QGlldGYub3JnXQ0KPiBFbnZvecOpwqA6IGx1bmRpIDIgbWFycyAyMDIwIDIwOjM1DQo+IMOA 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aW4gdGhlIHNlY3VyaXR5IHNlY3Rpb24uDQo+IA0KPiANCg0KW01lZF0gQWdyZWUuIFdlIGF2b2lk ZWQgdG8gaW5jbHVkZSBzdWNoIGRldGFpbHMgYmVjYXVzZSB0aGVzZSBhcmUgZGVwbG95bWVudC1z cGVjaWZpYyAoZHJhZnQtbmFtLW1wdGNwLWRlcGxveW1lbnQtY29uc2lkZXJhdGlvbnMtMDEjc2Vj dGlvbi01LjYuNykuIEJ1dCBpZiB5b3UgdGhpbmsgdGhpcyBpcyB1c2VmdWwgdG8gcmVjb3JkLCB3 ZSBjYW4gcmVpbnNlcnQgdGhlIHRleHQ6DQoNClguWC4gIExvZ2dpbmcNCg0KICAgSWYgdGhlIENv bnZlcnRlciBpcyBjb25maWd1cmVkIHRvIGJlaGF2ZSBpbiB0aGUgYWRkcmVzcyBzaGFyaW5nIG1v ZGUsIHRoZQ0KICAgbG9nZ2luZyByZWNvbW1lbmRhdGlvbnMgZGlzY3Vzc2VkIGluIFNlY3Rpb24g NCBvZiBbUkZDNjg4OF0gbmVlZCB0bw0KICAgYmUgY29uc2lkZXJlZC4gIFNlY3VyaXR5LXJlbGF0 ZWQgaXNzdWVzIGVuY291bnRlcmVkIGluIGFkZHJlc3MNCiAgIHNoYXJpbmcgZW52aXJvbm1lbnRz IGFyZSBkb2N1bWVudGVkIGluIFNlY3Rpb24gMTMgb2YgW1JGQzYyNjldLiAgDQoNCg== From nobody Wed Mar 4 02:23:40 2020 Return-Path: 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 41FF73A0B84; Wed, 4 Mar 2020 02:23:32 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.901 X-Spam-Level: X-Spam-Status: No, score=-0.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, CTE_8BIT_MISMATCH=0.999, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no 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 gsxVyeZjdLhf; Wed, 4 Mar 2020 02:23:30 -0800 (PST) Received: from rfc-editor.org (rfc-editor.org [4.31.198.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 241DB3A0B83; Wed, 4 Mar 2020 02:23:30 -0800 (PST) Received: by rfc-editor.org (Postfix, from userid 30) id 8E083F40721; Wed, 4 Mar 2020 02:23:08 -0800 (PST) To: touch@strayalpha.com, touch@isi.edu, mankin@psg.com, rbonica@juniper.net X-PHP-Originating-Script: 30:errata_mail_lib.php From: RFC Errata System Cc: ietf@kuehlewind.net, iesg@ietf.org, tcpm@ietf.org, rfc-editor@rfc-editor.org Content-Type: text/plain; charset=UTF-8 Message-Id: <20200304102308.8E083F40721@rfc-editor.org> Date: Wed, 4 Mar 2020 02:23:08 -0800 (PST) Archived-At: Subject: [tcpm] [Errata Verified] RFC5925 (5672) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Mar 2020 10:23:32 -0000 The following errata report has been verified for RFC5925, "The TCP Authentication Option". -------------------------------------- You may review the report below and at: https://www.rfc-editor.org/errata/eid5672 -------------------------------------- Status: Verified Type: Technical Reported by: Joe Touch Date Reported: 2019-03-24 Verified by: Mirja Kühlewind (IESG) Section: 6.2 Original Text ------------- /* set the flag when the SEG.SEQ first rolls over */ if ((RCV.SNE_FLAG == 0) && (RCV.PREV_SEQ > 0x7fff) && (SEG.SEQ < 0x7fff)) { RCV.SNE = RCV.SNE + 1; RCV.SNE_FLAG = 1; } /* decide which SNE to use after incremented */ if ((RCV.SNE_FLAG == 1) && (SEG.SEQ > 0x7fff)) { SNE = RCV.SNE - 1; # use the pre-increment value } else { SNE = RCV.SNE; # use the current value } /* reset the flag in the *middle* of the window */ if ((RCV.PREV_SEQ < 0x7fff) && (SEG.SEQ > 0x7fff)) { RCV.SNE_FLAG = 0; } /* save the current SEQ for the next time through the code */ RCV.PREV_SEQ = SEG.SEQ; Corrected Text -------------- /* set the flag when the SEG.SEQ first rolls over */ if ((RCV.SNE_FLAG == 0) && (RCV.PREV_SEQ > 0x7fffffff) && (SEG.SEQ < 0x7fffffff)) { RCV.SNE = RCV.SNE + 1; RCV.SNE_FLAG = 1; } /* decide which SNE to use after incremented */ if ((RCV.SNE_FLAG == 1) && (SEG.SEQ > 0x7fffffff)) { SNE = RCV.SNE - 1; # use the pre-increment value } else { SNE = RCV.SNE; # use the current value } /* reset the flag in the *middle* of the window */ if ((RCV.PREV_SEQ < 0x7fffffff) && (SEG.SEQ > 0x7fffffff)) { RCV.SNE_FLAG = 0; } /* save the current SEQ for the next time through the code */ RCV.PREV_SEQ = SEG.SEQ; Notes ----- The SNE values are 32 bits; the current pseudocode used 16-bit masks (0x7fff) instead of their 32-bit equivalent (0x7fffffff). This error was first noted by Tero Kivinen . -------------------------------------- RFC5925 (draft-ietf-tcpm-tcp-auth-opt-11) -------------------------------------- Title : The TCP Authentication Option Publication Date : June 2010 Author(s) : J. Touch, A. Mankin, R. Bonica Category : PROPOSED STANDARD Source : TCP Maintenance and Minor Extensions Area : Transport Stream : IETF Verifying Party : IESG From nobody Wed Mar 4 02:36:12 2020 Return-Path: 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 671863A0BF2; Wed, 4 Mar 2020 02:36:05 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.901 X-Spam-Level: X-Spam-Status: No, score=-0.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, CTE_8BIT_MISMATCH=0.999, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no 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 E8wTYI137Qt1; Wed, 4 Mar 2020 02:36:04 -0800 (PST) Received: from rfc-editor.org (rfc-editor.org [4.31.198.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 593163A0BEE; Wed, 4 Mar 2020 02:36:04 -0800 (PST) Received: by rfc-editor.org (Postfix, from userid 30) id 94AB2F40721; Wed, 4 Mar 2020 02:35:42 -0800 (PST) To: ignacio.goyret@nokia.com, touch@isi.edu, mankin@psg.com, rbonica@juniper.net X-PHP-Originating-Script: 30:errata_mail_lib.php From: RFC Errata System Cc: ietf@kuehlewind.net, iesg@ietf.org, tcpm@ietf.org, rfc-editor@rfc-editor.org Content-Type: text/plain; charset=UTF-8 Message-Id: <20200304103542.94AB2F40721@rfc-editor.org> Date: Wed, 4 Mar 2020 02:35:42 -0800 (PST) Archived-At: Subject: [tcpm] [Errata Rejected] RFC5925 (5347) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Mar 2020 10:36:06 -0000 The following errata report has been rejected for RFC5925, "The TCP Authentication Option". -------------------------------------- You may review the report below and at: https://www.rfc-editor.org/errata/eid5347 -------------------------------------- Status: Rejected Type: Editorial Reported by: Ignacio Goyret Date Reported: 2018-05-03 Rejected by: Mirja Kühlewind (IESG) Section: 5.1 Original Text ------------- 3. The TCP header, by default including options, and where the TCP checksum and TCP-AO MAC fields are set to zero, all in network- byte order. The TCP option flag of the MKT indicates whether the TCP options are included in the MAC. When included, only the TCP-AO MAC field is zeroed. When TCP options are not included, all TCP options except for TCP- AO are omitted from MAC processing. Again, the TCP-AO MAC field is zeroed for the MAC processing. Corrected Text -------------- 3. The TCP header and TCP options, where the TCP checksum and TCP-AO MAC fields are always set to zero, all in network-byte order. The TCP option flag of the MKT indicates which TCP options are included in the MAC. When TCP options are not included, only the TCP option for TCP-AO (as described in Section 2.2) is included in the MAC. Otherwise, all the TCP options are included in the MAC. Notes ----- Rewording for clarity and simplification. The original text could lead to confusion re '...When included, only the TCP-AO MAC field is zeroed.' --VERIFIER NOTES-- Rejected as the proposed text does not seem fundamentally clearer. -------------------------------------- RFC5925 (draft-ietf-tcpm-tcp-auth-opt-11) -------------------------------------- Title : The TCP Authentication Option Publication Date : June 2010 Author(s) : J. Touch, A. Mankin, R. Bonica Category : PROPOSED STANDARD Source : TCP Maintenance and Minor Extensions Area : Transport Stream : IETF Verifying Party : IESG From nobody Wed Mar 4 02:40:43 2020 Return-Path: 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 218F53A0C4E for ; Wed, 4 Mar 2020 02:40:39 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=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 XEuiaBOH9xeH for ; Wed, 4 Mar 2020 02:40:37 -0800 (PST) Received: from wp513.webpack.hosteurope.de (wp513.webpack.hosteurope.de [IPv6:2a01:488:42:1000:50ed:8223::]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5B09A3A0C1F for ; Wed, 4 Mar 2020 02:40:37 -0800 (PST) Received: from p200300dee7239a0084809b28d0f22131.dip0.t-ipconnect.de ([2003:de:e723:9a00:8480:9b28:d0f2:2131]); authenticated by wp513.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) id 1j9RS1-0003kB-4b; Wed, 04 Mar 2020 11:40:29 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: Mirja Kuehlewind In-Reply-To: <20170712170307.B28CCB81EBE@rfc-editor.org> Date: Wed, 4 Mar 2020 11:40:28 +0100 Cc: ananth@cisco.com, randall@lakerest.net, mdalal@cisco.com, "Scharf, Michael (Nokia - DE)" , Michael Tuexen , Yoshifumi Nishida , Wesley Eddy Content-Transfer-Encoding: quoted-printable Message-Id: <9A47DAAD-9579-42C8-A90C-B7A62557079F@kuehlewind.net> References: <20170712170307.B28CCB81EBE@rfc-editor.org> To: tcpm IETF list X-Mailer: Apple Mail (2.3445.104.11) X-bounce-key: webpack.hosteurope.de;ietf@kuehlewind.net;1583318437;81360368; X-HE-SMSGID: 1j9RS1-0003kB-4b Archived-At: Subject: Re: [tcpm] [Technical Errata Reported] RFC5961 (5068) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Mar 2020 10:40:41 -0000 Hi tcpm, I=E2=80=99m planning to mark the errata below as verified. Please let me = know if there are any concern about this! Mirja > On 12. Jul 2017, at 19:03, RFC Errata System = wrote: >=20 > The following errata report has been submitted for RFC5961, > "Improving TCP's Robustness to Blind In-Window Attacks". >=20 > -------------------------------------- > You may review the report below and at: > http://www.rfc-editor.org/errata/eid5068 >=20 > -------------------------------------- > Type: Technical > Reported by: Wesley Eddy >=20 > Section: 3.2 >=20 > Original Text > ------------- > [RFC0793] currently requires handling of a segment with the RST bit > when in a synchronized state to be processed as follows: > ... > Instead, implementations SHOULD implement the following steps in > place of those specified in [RFC0793] (as listed above). >=20 > Corrected Text > -------------- > [RFC0793] currently requires handling of a segment with the RST bit > when in a synchronized state to be processed as follows: > ... > Instead, when in either a synchronized state or SYN-RECEIVED, > implementations SHOULD implement the following steps in place of > those specified in [RFC0793] (as listed above, for the synchronized > states). Note that transition from SYN-RECEIVED to either LISTEN or > CLOSED and user signaling is still subject to whether the connection > was originated by a passive OPEN (as described in RFC 793). >=20 >=20 > Notes > ----- > The text in section 3.2 begins by stating a change from RFC 793 for = RST bit handling "when in a synchronized state" (which means all states = except for LISTEN, SYN-SENT, and SYN-RECEIVED). Later in the section, = the same change is described more loosely and text states that it's = applicable "In all states except SYN-SENT", and separate behavior is = provided for SYN-SENT, but the earlier text leaves uncertainty if the = former is supposed to apply to SYN-RECEIVED as well, since the earlier = text in the section section begins by discussing only "synchronized" = states. >=20 > Since the check is totally valid for SYN-RECEIVED, and the behavior in = steps 1, 2, and 3 are valid for SYN-RECEIVED, it seems appropriate to = make sure this is clarified in the earlier text. >=20 > Instructions: > ------------- > This erratum is currently posted as "Reported". If necessary, please > use "Reply All" to discuss whether it should be verified or > rejected. When a decision is reached, the verifying party =20 > can log in to change the status and edit the report, if necessary.=20 >=20 > -------------------------------------- > RFC5961 (draft-ietf-tcpm-tcpsecure-13) > -------------------------------------- > Title : Improving TCP's Robustness to Blind In-Window = Attacks > Publication Date : August 2010 > Author(s) : A. Ramaiah, R. Stewart, M. Dalal > Category : PROPOSED STANDARD > Source : TCP Maintenance and Minor Extensions > Area : Transport > Stream : IETF > Verifying Party : IESG From nobody Wed Mar 4 03:14:38 2020 Return-Path: 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 3D4903A0C8E for ; Wed, 4 Mar 2020 03:14:36 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=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 2lIJ5HGB050o for ; Wed, 4 Mar 2020 03:14:34 -0800 (PST) Received: from wp513.webpack.hosteurope.de (wp513.webpack.hosteurope.de [IPv6:2a01:488:42:1000:50ed:8223::]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7C4883A0C8C for ; Wed, 4 Mar 2020 03:14:34 -0800 (PST) Received: from p200300dee7239a0084809b28d0f22131.dip0.t-ipconnect.de ([2003:de:e723:9a00:8480:9b28:d0f2:2131]); authenticated by wp513.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) id 1j9Ryx-0007aA-F3; Wed, 04 Mar 2020 12:14:31 +0100 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: Mirja Kuehlewind In-Reply-To: Date: Wed, 4 Mar 2020 12:14:30 +0100 Cc: rhee@ncsu.edu, Lisong Xu , Sangtae Ha , "Eggert, Lars" , Richard Scheffenegger , Elliott Ecton Content-Transfer-Encoding: quoted-printable Message-Id: <8AE6EDDB-2332-472C-BD38-8CF8B9EFA2BD@kuehlewind.net> References: <20191114020710.3359AF406D8@rfc-editor.org> To: Neal Cardwell , tcpm X-Mailer: Apple Mail (2.3445.104.11) X-bounce-key: webpack.hosteurope.de;ietf@kuehlewind.net;1583320474;f0fc2846; X-HE-SMSGID: 1j9Ryx-0007aA-F3 Archived-At: Subject: Re: [tcpm] [Technical Errata Reported] RFC8312 (5907) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Mar 2020 11:14:36 -0000 Hi Neal, hi all, I rejected this errata, as I think you are right about section 4.2. = However, the text in section 5.1 does not really indicate that this is = the case, so I guess we could file a separate editorial errata to = clarify this. Do the authors have any opinions here? Mirja > On 15. Nov 2019, at 20:54, Neal Cardwell wrote: >=20 > On Thu, Nov 14, 2019 at 12:53 PM Neal Cardwell = wrote: >>=20 >> On Thu, Nov 14, 2019 at 12:12 PM RFC Errata System >> wrote: >>>=20 >>> The following errata report has been submitted for RFC8312, >>> "CUBIC for Fast Long-Distance Networks". >>>=20 >>> -------------------------------------- >>> You may review the report below and at: >>> https://www.rfc-editor.org/errata/eid5907 >>>=20 >>> -------------------------------------- >>> Type: Technical >>> Reported by: Elliott Ecton >>>=20 >>> Section: 5.1 >>>=20 >>> Original Text >>> ------------- >>> = +--------+----------+-----------+------------+-----------+----------+ >>> | Loss | Average | Average | CUBIC | CUBIC | = CUBIC | >>> | Rate P | TCP W | HSTCP W | (C=3D0.04) | (C=3D0.4) | = (C=3D4) | >>> = +--------+----------+-----------+------------+-----------+----------+ >>> | 10^-2 | 12 | 12 | 12 | 12 | = 12 | >>> | 10^-3 | 38 | 38 | 38 | 38 | = 59 | >>> | 10^-4 | 120 | 263 | 120 | 187 | = 333 | >>> | 10^-5 | 379 | 1795 | 593 | 1054 | = 1874 | >>> | 10^-6 | 1200 | 12279 | 3332 | 5926 | = 10538 | >>> | 10^-7 | 3795 | 83981 | 18740 | 33325 | = 59261 | >>> | 10^-8 | 12000 | 574356 | 105383 | 187400 | = 333250 | >>> = +--------+----------+-----------+------------+-----------+----------+ >>>=20 >>> Table 1 >>>=20 >>> Corrected Text >>> -------------- >>> = +--------+----------+-----------+------------+-----------+----------+ >>> | Loss | Average | Average | CUBIC | CUBIC | = CUBIC | >>> | Rate P | TCP W | HSTCP W | (C=3D0.04) | (C=3D0.4) | = (C=3D4) | >>> = +--------+----------+-----------+------------+-----------+----------+ >>> | 10^-2 | 12 | 12 | 3 | 6 | = 11 | >>> | 10^-3 | 38 | 38 | 19 | 33 | = 59 | >>> | 10^-4 | 120 | 263 | 120 | 187 | = 333 | >>> | 10^-5 | 379 | 1795 | 593 | 1054 | = 1874 | >>> | 10^-6 | 1200 | 12279 | 3332 | 5926 | = 10538 | >>> | 10^-7 | 3795 | 83981 | 18740 | 33325 | = 59261 | >>> | 10^-8 | 12000 | 574356 | 105383 | 187400 | = 333250 | >>> = +--------+----------+-----------+------------+-----------+----------+ >>>=20 >>> Table 1 >>>=20 >>> Notes >>> ----- >>> The CUBIC average window sizes for 10^2 and 10^3 are incorrect in = the original text using expression 6. >>=20 >> I strongly suspect that the original text is correct. >>=20 >> Note that the proposed edit would cause the average congestion window >> size of CUBIC to be below that of "TCP W", the Reno [RFC5681] window, >> in the cases with loss rates of 10^-2 and 10^-3. But as mentioned in >> section 4.2. "TCP-Friendly Region", where the native CUBIC curve >> computation produces a target congestion window that is lower than = the >> congestion window Reno would use, the CUBIC algorithm instead uses = the >> Reno target congestion window. So the average congestion window size >> of CUBIC should not be below that of Reno. I believe that is why in >> the original table the average congestion window for "TCP W" and = CUBIC >> match in cases with loss rates of 10^-2 and 10^-3 and with CUBIC = using >> C=3D0.04 or C=3D0.4. >>=20 >> Are there tests or simulations showing CUBIC achieving a lower >> congestion window in these cases with loss rates of 10^-2 and 10^-3? >>=20 >> best, >> neal >=20 > I got a bounce from my "reply-all". It seems there was a typo in the > e-mail address of the report, and it should have been: > Elliott Ecton > ...rather than: > Elliott Ecton >=20 > I am following up to make sure the elliott.ecton@netapp.com address > has the reply and the thread has the correct e-mail address. >=20 > best, > neal >=20 From nobody Wed Mar 4 03:20:43 2020 Return-Path: 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 CE0F13A0CA9 for ; Wed, 4 Mar 2020 03:20:41 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=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 gw5lgRKRpA6a for ; Wed, 4 Mar 2020 03:20:40 -0800 (PST) Received: from wp513.webpack.hosteurope.de (wp513.webpack.hosteurope.de [IPv6:2a01:488:42:1000:50ed:8223::]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 438EB3A0CA3 for ; Wed, 4 Mar 2020 03:20:40 -0800 (PST) Received: from p200300dee7239a0084809b28d0f22131.dip0.t-ipconnect.de ([2003:de:e723:9a00:8480:9b28:d0f2:2131]); authenticated by wp513.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) id 1j9S4i-0004Up-0D; Wed, 04 Mar 2020 12:20:28 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: Mirja Kuehlewind In-Reply-To: <20200304103542.94AB2F40721@rfc-editor.org> Date: Wed, 4 Mar 2020 12:20:27 +0100 Cc: mankin@psg.com, rbonica@juniper.net, tcpm Content-Transfer-Encoding: quoted-printable Message-Id: <94FF64F5-2B55-4365-B6BB-6609BC04480B@kuehlewind.net> References: <20200304103542.94AB2F40721@rfc-editor.org> To: touch@isi.edu, ignacio.goyret@nokia.com X-Mailer: Apple Mail (2.3445.104.11) X-bounce-key: webpack.hosteurope.de;ietf@kuehlewind.net;1583320840;7e0eec13; X-HE-SMSGID: 1j9S4i-0004Up-0D Archived-At: Subject: Re: [tcpm] [Errata Rejected] RFC5925 (5347) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Mar 2020 11:20:42 -0000 Hi all, This errata was discussed on the list some time back. The discussion = didn=E2=80=99t converge to an appropriate text, therefore I rejected the = errata for now.=20 Please simply file a new errata if text was agreed and it is still = needed! Thanks! Mirja > On 4. Mar 2020, at 11:35, RFC Errata System = wrote: >=20 > The following errata report has been rejected for RFC5925, > "The TCP Authentication Option". >=20 > -------------------------------------- > You may review the report below and at: > https://www.rfc-editor.org/errata/eid5347 >=20 > -------------------------------------- > Status: Rejected > Type: Editorial >=20 > Reported by: Ignacio Goyret > Date Reported: 2018-05-03 > Rejected by: Mirja K=C3=BChlewind (IESG) >=20 > Section: 5.1 >=20 > Original Text > ------------- > 3. The TCP header, by default including options, and where the TCP > checksum and TCP-AO MAC fields are set to zero, all in network- > byte order. >=20 > The TCP option flag of the MKT indicates whether the TCP options > are included in the MAC. When included, only the TCP-AO MAC field > is zeroed. >=20 > When TCP options are not included, all TCP options except for TCP- > AO are omitted from MAC processing. Again, the TCP-AO MAC field > is zeroed for the MAC processing. >=20 >=20 > Corrected Text > -------------- > 3. The TCP header and TCP options, where the TCP checksum and TCP-AO > MAC fields are always set to zero, all in network-byte order. >=20 > The TCP option flag of the MKT indicates which TCP options are > included in the MAC. When TCP options are not included, only the > TCP option for TCP-AO (as described in Section 2.2) is included > in the MAC. Otherwise, all the TCP options are included in the MAC. >=20 >=20 > Notes > ----- > Rewording for clarity and simplification. > The original text could lead to confusion re '...When included, only = the TCP-AO MAC field is zeroed.' > --VERIFIER NOTES--=20 > Rejected as the proposed text does not seem fundamentally clearer. >=20 > -------------------------------------- > RFC5925 (draft-ietf-tcpm-tcp-auth-opt-11) > -------------------------------------- > Title : The TCP Authentication Option > Publication Date : June 2010 > Author(s) : J. Touch, A. Mankin, R. Bonica > Category : PROPOSED STANDARD > Source : TCP Maintenance and Minor Extensions > Area : Transport > Stream : IETF > Verifying Party : IESG >=20 >=20 From nobody Wed Mar 4 20:55:22 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 3E0163A0BFE; Wed, 4 Mar 2020 20:55:12 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Roman Danyliw via Datatracker To: "The IESG" Cc: draft-ietf-tcpm-converters@ietf.org, tcpm-chairs@ietf.org, tcpm@ietf.org, Michael Scharf , michael.scharf@hs-esslingen.de X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Roman Danyliw Message-ID: <158338411222.29467.10310159759460758574@ietfa.amsl.com> Date: Wed, 04 Mar 2020 20:55:12 -0800 Archived-At: Subject: [tcpm] Roman Danyliw's Discuss on draft-ietf-tcpm-converters-17: (with DISCUSS and COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 04:55:13 -0000 Roman Danyliw has entered the following ballot position for draft-ietf-tcpm-converters-17: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- ** Deployed without constraints, there would be a number of concerning attacks given this protocol’s design. Christian Huitema’s SecDir review (thank you!) notes some of them. Helpfully, this draft presents various restrictive scoping to mitigate these attacks under certain circumstances: (a) Section 4.1. Transport Converters can be operated by network operators or third parties. Nevertheless, this document focuses on the single administrative deployment case where the entity offering the connectivity service to a client is also the entity which owns and operates the Transport Converter. (b) Section 9.1. Furthermore, ingress filtering policies MUST be enforced at the network boundaries [RFC2827]. (c) Section 9.2. The Convert Protocol is intended to be used in managed networks where end hosts can be identified by their IP address. (d) Section 9.2. Stronger mutual authentication schemes MUST be defined to use the Convert Protocol in more open network environments. Unfortunately, the protocol mechanism to operate outside of these bounds is in scope because (a) and (c) include no normative language. For example, this document doesn’t address converters operated by third parties but it explicitly allows for their possibility with no discussion of the impact. As this is an experimental document where implementation experience likely is needed for refinement, could a compromise be found with an applicability statement that shrinks the threat model and provide better normative guidance. For example (paraphrasing): Applicability statement: Transport Converters MUST only be deployed in a single administrative domain deployment model. The entity offering the connectivity service to a client MUST also be entity which owns and operates the Transport Converter, with no transit over a third-party network. For the Security Considerations: The Convert Protocol is RECOMMENDED to be used in a managed network where end hosts can be identified by their IP address. If such control is not exerted and there is a more open network environment, a strong mutual authentication scheme MUST be defined to use the Convert Protocol. ** Section 9.1. Per “Given its function and its location in the network, a Transport Converter has access to the payload of all the packets that it processes.”, it’s a per more than that. It is in a position to observe all packets, so that’s payload, meta-data and the ability to profile and conduct traffic analysis. Perhaps something on the order of “Given its function and location in the network, a Transport Convert is in a position to observe all packets, to include payloads and meta-data; and has the ability to profile and conduct traffic analysis of user behavior”. ** Section 9.1. Per “As such, it MUST be protected as a core IP router (e.g., [RFC1812])”, no disagreement on the need to protect this router. However, what exact practices are being suggested? Given the RFC1812, reference, what specific sections apply? ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- ** Section 1.2. Given that Section 4.1. outlines that the architecture consists of clients, converter and servers, the language in the list following “In particular, a Transport Converter achieves the following :” might benefit from consistency (i.e., final target server vs. server; and server vs. converter) ** Section 6.2.5. Per “Upon reception of an Extended Connect TLV, a Transport Converter first checks whether it supports the TCP Options listed in the 'TCP Options' field. If not, it returns an error message (Section 6.2.8).”, what error does it return? ** Section 9.1 Per “The Transport Converter is designed to not leak such sensitive information outside a local domain.”, can you clarify what that means. ** Editorially, the guidance in Section 9.2 and 9.5 needs to link Section 9.2 provide an authentication/authorization solution given a certain topology, and does Section 9.5. ** Editorial Nit -- Section 2. Typo. s/a important/an important/ -- Section 4.4.1. 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bi9hdXRob3JpemF0aW9uIHNvbHV0aW9uIGdpdmVuIGEgY2VydGFpbg0KPiB0b3BvbG9neSwgYW5k DQo+IGRvZXMgU2VjdGlvbiA5LjUuDQo+IA0KDQpbTWVkXSBGYWlyLiBXaWxsIGJlIGZpeGVkLiAN Cg0KPiAqKiBFZGl0b3JpYWwgTml0DQo+IC0tIFNlY3Rpb24gMi4gVHlwby4gcy9hIGltcG9ydGFu dC9hbiBpbXBvcnRhbnQvDQo+IC0tIFNlY3Rpb24gNC40LjEuIFR5cG8uIHMvdGhlIHRoZS90aGUv DQo+IA0KDQpbTWVkXSBGaXhlZC4gVGhhbmtzLiANCg0KPiANCg0K From nobody Thu Mar 5 01:45:47 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 8F2273A086B; Thu, 5 Mar 2020 01:45:41 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Benjamin Kaduk via Datatracker To: "The IESG" Cc: draft-ietf-tcpm-converters@ietf.org, tcpm-chairs@ietf.org, tcpm@ietf.org, Michael Scharf , michael.scharf@hs-esslingen.de X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Benjamin Kaduk Message-ID: <158340154155.14719.4463590324876056408@ietfa.amsl.com> Date: Thu, 05 Mar 2020 01:45:41 -0800 Archived-At: Subject: [tcpm] Benjamin Kaduk's Discuss on draft-ietf-tcpm-converters-17: (with DISCUSS and COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 09:45:42 -0000 Benjamin Kaduk has entered the following ballot position for draft-ietf-tcpm-converters-17: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- I agree with Roman, and present a somewhat different take on some of the key aspects of the scoping discussion. I have pretty fundamental concerns about describing this protocol as a "0-RTT" service when it both requires strong mutual authentication/authorization of the communicating endpoints and relies on the (local) network to provide those properties. If IP in general provided the kind of mutual authentication assumed here, the internet would be a much more secure place! Unfortunately, it does not and I think this document does its readers a disservice by transparently assuming that it does (in the main body of text; the security considerations do touch on the requisite details). It would be better to discuss the proxy protocol separately from the deployment considerations that allow it to be used without additional set-up in specific deployment scenarios. And that's only when considering the client authenticating the server! Mutual authentication also requires the server to authenticate the client and be able to make authorization decisions based upon that authenticated identity. The deployment model presented here seems to imply a very tight coupling between the Transport Converter operator and the network service provider (in order to determine, based on client IP address, the authenticated client identity and access an authorization database); this seems to make it incompatible with the stated possibility of using a third-party Transport Converter. Additionally, it raises some questions along the lines of draft-arkko-iab-internet-consolidation and draft-iab-for-the-users. The sketch of a solution for more open network environments in Section 9.2 is insecure (once a Cookie is generated and sent once, it can be freely replayed by an attacker during the Cookie lifetime, which defeats the authorization requirement of the convert protocol). Either fix it or remove it entirely. Please resolve the internal inconsistency in Section 6.2.4 which says that TCP option Kind 0 MUST NOT appear in the list but then goes on to say that the list is padded with zeros to a 32-bit boundary. (There is no listed requirement that the options are listed in any given order, which would be needed to assign a boundary between "listed options" and "padding".) Why do we need the Cookie TLV at all if the underlying local network supplies all the authentication and authorization that the protocol needs? Section 1.2 says that the Convert Protocol "is an application-layer protocol which uses a dedicated TCP port number", but the IANA request in Section 10.1 is for a service name without fixed port number. ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Section 1.1 scheme can be applied independently on clients and servers. Other improvements such as Selective Acknowledgments [RFC2018] or large windows [RFC7323] require a new TCP option or to change the semantics of some fields in the TCP header. These modifications must be deployed on both clients and servers to be actually used on the Internet. Experience with the latter TCP extensions reveals that their deployment can require many years. Fukuda reports in Do we want to say "the latter" or "the latter class of"? Timestamps. [ANRW17] describes measurements showing that TCP Fast Open (TFO) [RFC7413] is still not widely deployed. Perhaps people are turned off by its privacy properties or lack confidence that their data can tolerate replay? This is not the most compelling example of a TCP feature that everyone should be using... More recently, 5G bonding experimentation has been conducted into global range of the incumbent 4G (LTE) connectivity using newly devised clients and a Multipath TCP proxy. Even if the 5G and the 4G bonding relying upon Multipath TCP increases the bandwidth, it is as nit: the grammar is not right here; either "to increase" or "reliance upon", depending on the intended meaning, I think. mobile core. In order to handle URLLC (Ultra Reliable Low Latency Communication) for the next generation mobile network, Multipath TCP and its proxy mechanism such as the one used to provide Access Traffic Steering, Switching, and Splitting (ATSSS) must be optimized to reduce latency [TS23501]. There are a lot of missing steps of reasoning here if we want to claim that this is a technical fact vs. marketing material. Section 1.2 The Convert Protocol provides 0-RTT (Zero Round-Trip Time) conversion service since no extra delay is induced by the protocol compared to connections that are not proxied. Particularly, the Convert Protocol does not require extra signaling setup delays before making use of the conversion service. The Convert Protocol does not require any In tightly controlled network environments where MAC can be assumed to provide sufficient authentication, authorization, and access-control functionality to meet the security needs of the proxy protocol; this cannot hold when additional mutual authentication schemes are required, as envisioned in Section 9.2 The Transport Converter adheres to the main principles drawn in [RFC1919]. In particular, a Transport Converter achieves the Er, which principles are those? RFC 1919 is a 35-page document entitiled "Classical versus Transparent IP proxies" that facially seems to be a comparison and not a declaration of guiding principles. The main advantage of network-assisted conversion services is that they enable new TCP extensions to be used on a subset of the path between endpoints, which encourages the deployment of these If those are the extensions that the conversion-service provider is interested in. Are other extensions blocked due to inactivity on the part of the provider? Section 2 destination. In today's Internet, latency is a important metric and various protocols have ben tuned to reduce their latency nit: s/ben/been/ "Please don't tune me!" Section 4.1 A connection can be initiated from both sides of the Transport Converter (Internet-facing interface, customer-facing interface). How does the internet-facing-initiated case work? Does the client have to register? Transport Converters can be operated by network operators or third parties. Nevertheless, this document focuses on the single I'm not convinced that the present document actually describes how to use a third-party-run transport converter in a secure fashion. A Client is configured, through means that are outside the scope of this document, with the names and/or the addresses of one or more Transport Converters and the TCP extensions that they support. The Using names rather than addresses adds a "secure DNS" requirement to the existing assumptions of local-network security. connections. This encourages the deployment of new TCP extensions until they are widely supported by servers, in particular. This document has not yet shown me much to indicate that transparent converter implementors are more incentivized to implement new TCP extensions than third-party server operators are. Similar to SOCKS, the architecture does not interfere with end-to-end TLS connections [RFC8446] between the Client and the Server (Figure 3). In other words, end-to-end TLS is supported in the Why is TLS specifically noteworthy? Does this not apply to all higher-level protocols? It is out of scope of this document to elaborate on specific considerations related to the use of TLS in the Client-Converter connection leg to exchange Convert messages (in addition to the end- to-end TLS connection). Because that can't be done in 0-RTT in the general case? Section 4.2 Server, without experiencing an extra delay. The Transport Converter waits until the receipt of the confirmation that the Server agrees to establish the connection before confirming it to the Client. nit: I suggest clarifying the antecedent of "it". that SYN. The Transport Converter receives this SYN because it is, for example, on the path between the remote host and the Client or it provides address sharing service for the Client. If the check fails, Is there a reference for "address sharing service"? As discussed in [RFC7413], such change to TCP semantic raises two issues. First, duplicate SYNs can cause problems for some applications that rely on TCP. Second, TCP suffers from SYN flooding Is it really best to say "some applications" when the onus to prove replay-safety on a per-protocol basis leads to a need to assume as a baseline that all protocols are not compatible with TFO until proven otherwise? terminate the downstream connection by using FIN packets. If the downstream connection terminates with the exchange of FIN packets, Why do we have "RST segment" in the previous paragraph but "FIN packet" here? Section 4.3 * Lifetime is the validity lifetime of the entry as assigned by the Converter. Conceptually a lifetime is a "time to survive relative to a given reference time". If the reference time is "now", this lifetime would need to be continuously updated; if not, don't we need to also store the reference time? (Alternately, just store the expiration time and not the lifetime.) Section 5.1 Do we want to say anything about (end-to-end?) MPTCP operation with the Transport Converter in the middle? Does it need to do anything other than just pass packets (and maybe swap out addresses)? Section 5.2 address, external port number). The external IP address and external port number will be then advertised using an out-of-band mechanism so that remote hosts can initiate TCP connections to the Client via the Converter. Note that the external and internal information may be Advertised by the Transport Converter or the Client? (We leave it implicit that the allocated external address/port will be communicated back to the client by PCP.) is found, the Converter silently ignores the message. If an entry is found, the Converter inserts an MP_CAPABLE option and Connect TLV in the SYN packet, rewrites the source IP address to one of its IP addresses and, eventually, the destination IP address and port number in accordance with the information stored in the mapping. SYN+ACK Why "eventually"? It is out of scope of this document to define specific Convert TLVs to manage incoming connections. These TLVs can be defined in a separate document. It seems a little bit of a bait-and-switch to do so, given that the discussion of the example in Figure 6 explicitly says "the Tranport Convert [sic] inserts a TLV message that indicates the source address and port number of the remote host". Section 6 Convert messages may appear only in a SYN, SYN+ACK, or in an ACK that is sent shortly after the SYN+ACK. Can we be more precise about "shortly after the SYN+ACK" (e.g., "acknowledging the SYN")? Section 6.1 Was any consideration given to including a "magic string" in the fixed header, to provide additional protection against misconfiguration about whether Convert is to be used on a given connection? The Unassigned field MUST be set to zero in this version of the protocol. These bits are available for future use. But only in a future version, the way this is defined. (That is, ruling out using those bits as extension points within version 1.) Section 6.2.2 capabilities. Assuming the Client is authorized to invoke the Transport Converter, the latter replies with the Supported TCP Extensions TLV (Section 6.2.4). Just to confirm: based on this design, the Transport Converter currently has nothing other than the Client IP address to use as input to this authorization decision? Section 6.2.5 We distinguish two types of Connect TLV based on their length: (1) the Base Connect TLV has a length of 20 bytes and contains a remote Which is to say, a Length field containing the value 5. I'm confused about the default options semantics. First we say that the default options are those advertised in the Supported TCP Extensions TLV, which would seem to imply that the converter doesn't support any extensions that are not listed there. But then we go on to say that for an Extended Connect TLV, the options contained in the TLV are *additional* options that are *added* to the default set of options ... but only if the converter supports those options. But if it supports an option, wouldn't it already be in the default list, since the default list is the list of supported options? The way it's currently worded, the extended connect TLV seems only useful for specifying precise values for options that take a value, but not for adding entirely new options. Section 6.2.6 by the Server in the SYN+ACK packet. A Transport Converter MUST return this TLV if the Client sent an Extended Connect TLV and the connection was accepted by the server. Is the converter allowed to return this option if a basic connect was used? Should the converter always attempt to return this option? Section 6.2.7 the Client. This Cookie can be configured on the Client by means that are outside of this document or provided by the Transport Converter as follows. [But not as immediately follows; there's other content in between.] Section 6.2.8 An Error TLV can be included in the SYN+ACK or an ACK sent shortly after the SYN+ACK. [same comment about "shortly after"] encoded in 8 bits. The list of supported versions should be padded with zeros to end on a 32 bits boundary. "should be"? It's a protocol violation to not do something to make it end on a 32-bit boundary, and putting anything other than zero is liable to cause the peer to make bad assumptions, so this seems pretty mandatory to me. Upon receipt of this error code, the remote peer (e.g., Client) checks whether it supports one of the versions returned by the peer. The highest common supported version MUST be used by the remote peer in subsequent exchanges with the peer. There doesn't seem to be any protection against version downgrade (e.g., by MITM) in this exchange. To ease troubleshooting, the value field MUST echo the received message shifted by one byte to keep to original alignment of the message. I'm not sure what's meant by this "shifted" language is going to be clear to all readers. (Occurs multiple times.) o Not Authorized (32): This error code indicates that the Transport Converter refused to create a connection because of a lack of authorization (e.g., administratively prohibited, authorization failure, invalid Cookie TLV, etc.). The Value field MUST be set invalid or missing, IIUC. o Unsupported TCP Option (33): A TCP option that the Client requested to advertise to the final Server cannot be safely used. Why the mismatch between "unsupported" and "cannot be safely used"? Section 7.6 types of Connect TLV. If such a Transport Converter receives a Connect TLV with the TCP Fast Open cookie option that does not contain a cookie, it MUST add an empty TCP Fast Open cookie option in the SYN sent to the remote server. If such a Transport Converter receives a Connect TLV with the TCP Fast Open cookie option that contains a cookie, it MUST copy the TCP Fast Open cookie option in the SYN sent to the remote server. Just to check: we don't need to specify any additional behavior for the response (e.g., to give the client the cookie from the server), since that falls out naturally from the requirement to send the Extended TCP Header TLV? Section 7.7 A Transport Converter MUST NOT advertise the TCP-AO option (Kind=29) in the Supported TCP Extensions TLV. If a Transport Converter receives a Connect TLV that contains the TCP-AO option, it MUST reject the establishment of the connection with error code set to "Unsupported TCP Option", except if the TCP-AO-NAT option is used. Perhaps a reminder that, since TCP-AO-NAT is Experimental, such usage is not currently defined and must be specified by some other document before it can be used, would be in order? Section 9 An implementation needs to check that the TLVs are properly framed within the boundary indicated by the Total Length in the fixed header. Section 9.1 processes. As such, it MUST be protected as a core IP router (e.g., [RFC1812]). nit: I don't think the grammar is quite right here; maybe "as protected as" or "protected as if it was". This document assumes that all network attachments are managed by the same administrative entity. Therefore, enforcing anti-spoofing filters at these network ensures that hosts are not sending traffic with spoofed source IP addresses. Until some network infrastructure equipment gets compromised. (That is to say "ensures" may be stronger language than is merited.) Section 9.2 The Convert Protocol is intended to be used in managed networks where end hosts can be identified by their IP address. End hosts can always be identified by their IP address in any network ... subject to spoofing. Perhaps you mean to say "securely identified"? Section 9.4 I'm confused why we're talking about an illegitimate converter being possible given that we assume the network is secure. Section 9.5 The operator that manages the various network attachments (including the Transport Converters) can enforce authentication and authorization policies using appropriate mechanisms. For example, a I suggest "has various options for enforcing authentication and authorization policies"; the current language could be misread as saying that such enforcement is optional. o The network provider may enforce a policy based upon Access Control Lists (ACLs), e.g., at a Broadband Network Gateway (BNG) to control the hosts that are authorized to communicate with a Transport Converter. These ACLs may be installed as a result of RADIUS exchanges, e.g., [I-D.boucadair-radext-tcpm-converter]. This method does not require any interaction with the Transport Converter for authorization matters. o A device that embeds a Transport Converter may also host a RADIUS client that will solicit an AAA server to check whether connections received from a given source IP address are authorized or not [I-D.boucadair-radext-tcpm-converter]. These both seem to require that the network has strong anti-spoofing protections in place. Section 11.1 It's not entirely clear that RFC 6978 needs to be normative, given that we explicitly do *not* include support for that protocol in this document (shunting non-standards-track tcp option support to other documents). Section 11.2 RFC 1919 might be normative if I had a better understanding of what we wanted from it (see above). I'm surprised that RFC 2782 isn't normative given that SRV discovery seems like the only defined way to discover the port number of the convert service. From nobody Thu Mar 5 01:58:30 2020 Return-Path: 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 13CA63A1178; Thu, 5 Mar 2020 01:58:17 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=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 3J1ilu2dGWVM; Thu, 5 Mar 2020 01:58:13 -0800 (PST) Received: from wp513.webpack.hosteurope.de (wp513.webpack.hosteurope.de [IPv6:2a01:488:42:1000:50ed:8223::]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 55D0C3A1172; Thu, 5 Mar 2020 01:58:13 -0800 (PST) Received: from p200300dee7239a00e984148d77e3bc6d.dip0.t-ipconnect.de ([2003:de:e723:9a00:e984:148d:77e3:bc6d]); authenticated by wp513.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) id 1j9nGd-0000QP-9o; Thu, 05 Mar 2020 10:58:11 +0100 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: Mirja Kuehlewind In-Reply-To: <158340154155.14719.4463590324876056408@ietfa.amsl.com> Date: Thu, 5 Mar 2020 10:58:10 +0100 Cc: The IESG , draft-ietf-tcpm-converters@ietf.org, tcpm@ietf.org, michael.scharf@hs-esslingen.de, tcpm-chairs@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <158340154155.14719.4463590324876056408@ietfa.amsl.com> To: Benjamin Kaduk X-Mailer: Apple Mail (2.3445.104.11) X-bounce-key: webpack.hosteurope.de;ietf@kuehlewind.net;1583402293;c683b048; X-HE-SMSGID: 1j9nGd-0000QP-9o Archived-At: Subject: Re: [tcpm] Benjamin Kaduk's Discuss on draft-ietf-tcpm-converters-17: (with DISCUSS and COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 09:58:25 -0000 Hi Ben, The problem you describe is a problem about TCP in general. Any node on = path can terminate your TCP connection transparently and that also done = often enough. The difference in this case is that the converter is explicitly = addressed by the client. However, the point here is that the traffic = needs to get routed over the converter, so the converter can become = active, and therefore you need to address it. If there happen to be = another converter, or any other TCP-terminating node, on path, it can = well happen that that node is reply to you instead of the node you have = actually targeted. This is the same when you open a TCP connection to an = application server and it gets intercepted on the path (potentially = without you noticing). That is just the inherent problem of TCP not = having any build in authentication. If you want to solve that problem, = you need to deprecate TCP. Mirja > On 5. Mar 2020, at 10:45, Benjamin Kaduk via Datatracker = wrote: >=20 > Benjamin Kaduk has entered the following ballot position for > draft-ietf-tcpm-converters-17: Discuss >=20 > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut = this > introductory paragraph, however.) >=20 >=20 > Please refer to = https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. >=20 >=20 > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/ >=20 >=20 >=20 > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- >=20 > I agree with Roman, and present a somewhat different take on some of = the > key aspects of the scoping discussion. >=20 > I have pretty fundamental concerns about describing this protocol as a > "0-RTT" service when it both requires strong mutual > authentication/authorization of the communicating endpoints and relies > on the (local) network to provide those properties. If IP in general > provided the kind of mutual authentication assumed here, the internet > would be a much more secure place! Unfortunately, it does not and I > think this document does its readers a disservice by transparently > assuming that it does (in the main body of text; the security > considerations do touch on the requisite details). It would be better > to discuss the proxy protocol separately from the deployment > considerations that allow it to be used without additional set-up in > specific deployment scenarios. >=20 > And that's only when considering the client authenticating the server! > Mutual authentication also requires the server to authenticate the > client and be able to make authorization decisions based upon that > authenticated identity. The deployment model presented here seems to > imply a very tight coupling between the Transport Converter operator = and > the network service provider (in order to determine, based on client = IP > address, the authenticated client identity and access an authorization > database); this seems to make it incompatible with the stated > possibility of using a third-party Transport Converter. > Additionally, it raises some questions along the lines of > draft-arkko-iab-internet-consolidation and draft-iab-for-the-users. >=20 > The sketch of a solution for more open network environments in Section > 9.2 is insecure (once a Cookie is generated and sent once, it can be > freely replayed by an attacker during the Cookie lifetime, which = defeats > the authorization requirement of the convert protocol). Either fix it > or remove it entirely. >=20 > Please resolve the internal inconsistency in Section 6.2.4 which says > that TCP option Kind 0 MUST NOT appear in the list but then goes on to > say that the list is padded with zeros to a 32-bit boundary. (There = is > no listed requirement that the options are listed in any given order, > which would be needed to assign a boundary between "listed options" = and > "padding".) >=20 > Why do we need the Cookie TLV at all if the underlying local network > supplies all the authentication and authorization that the protocol > needs? >=20 > Section 1.2 says that the Convert Protocol "is an application-layer > protocol which uses a dedicated TCP port number", but the IANA request > in Section 10.1 is for a service name without fixed port number. >=20 >=20 > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- >=20 > Section 1.1 >=20 > scheme can be applied independently on clients and servers. Other > improvements such as Selective Acknowledgments [RFC2018] or large > windows [RFC7323] require a new TCP option or to change the = semantics > of some fields in the TCP header. These modifications must be > deployed on both clients and servers to be actually used on the > Internet. Experience with the latter TCP extensions reveals that > their deployment can require many years. Fukuda reports in >=20 > Do we want to say "the latter" or "the latter class of"? >=20 > Timestamps. [ANRW17] describes measurements showing that TCP Fast > Open (TFO) [RFC7413] is still not widely deployed. >=20 > Perhaps people are turned off by its privacy properties or lack > confidence that their data can tolerate replay? This is not the most > compelling example of a TCP feature that everyone should be using... >=20 > More recently, 5G bonding experimentation has been conducted into > global range of the incumbent 4G (LTE) connectivity using newly > devised clients and a Multipath TCP proxy. Even if the 5G and the = 4G > bonding relying upon Multipath TCP increases the bandwidth, it is as >=20 > nit: the grammar is not right here; either "to increase" or "reliance > upon", depending on the intended meaning, I think. >=20 > mobile core. In order to handle URLLC (Ultra Reliable Low Latency > Communication) for the next generation mobile network, Multipath TCP > and its proxy mechanism such as the one used to provide Access > Traffic Steering, Switching, and Splitting (ATSSS) must be optimized > to reduce latency [TS23501]. >=20 > There are a lot of missing steps of reasoning here if we want to claim > that this is a technical fact vs. marketing material. >=20 > Section 1.2 >=20 > The Convert Protocol provides 0-RTT (Zero Round-Trip Time) = conversion > service since no extra delay is induced by the protocol compared to > connections that are not proxied. Particularly, the Convert = Protocol > does not require extra signaling setup delays before making use of > the conversion service. The Convert Protocol does not require any >=20 > In tightly controlled network environments where MAC can be assumed to > provide sufficient authentication, authorization, and access-control > functionality to meet the security needs of the proxy protocol; this > cannot hold when additional mutual authentication schemes are = required, > as envisioned in Section 9.2 >=20 > The Transport Converter adheres to the main principles drawn in > [RFC1919]. In particular, a Transport Converter achieves the >=20 > Er, which principles are those? RFC 1919 is a 35-page document > entitiled "Classical versus Transparent IP proxies" that facially = seems > to be a comparison and not a declaration of guiding principles. >=20 > The main advantage of network-assisted conversion services is that > they enable new TCP extensions to be used on a subset of the path > between endpoints, which encourages the deployment of these >=20 > If those are the extensions that the conversion-service provider is > interested in. Are other extensions blocked due to inactivity on the > part of the provider? >=20 > Section 2 >=20 > destination. In today's Internet, latency is a important metric and > various protocols have ben tuned to reduce their latency >=20 > nit: s/ben/been/ "Please don't tune me!" >=20 > Section 4.1 >=20 > A connection can be initiated from both sides of the Transport > Converter (Internet-facing interface, customer-facing interface). >=20 > How does the internet-facing-initiated case work? Does the client = have > to register? >=20 > Transport Converters can be operated by network operators or third > parties. Nevertheless, this document focuses on the single >=20 > I'm not convinced that the present document actually describes how to > use a third-party-run transport converter in a secure fashion. >=20 > A Client is configured, through means that are outside the scope of > this document, with the names and/or the addresses of one or more > Transport Converters and the TCP extensions that they support. The >=20 > Using names rather than addresses adds a "secure DNS" requirement to = the > existing assumptions of local-network security. >=20 > connections. This encourages the deployment of new TCP extensions > until they are widely supported by servers, in particular. >=20 > This document has not yet shown me much to indicate that transparent > converter implementors are more incentivized to implement new TCP > extensions than third-party server operators are. >=20 > Similar to SOCKS, the architecture does not interfere with = end-to-end > TLS connections [RFC8446] between the Client and the Server > (Figure 3). In other words, end-to-end TLS is supported in the >=20 > Why is TLS specifically noteworthy? Does this not apply to all > higher-level protocols? >=20 > It is out of scope of this document to elaborate on specific > considerations related to the use of TLS in the Client-Converter > connection leg to exchange Convert messages (in addition to the end- > to-end TLS connection). >=20 > Because that can't be done in 0-RTT in the general case? >=20 > Section 4.2 >=20 > Server, without experiencing an extra delay. The Transport = Converter > waits until the receipt of the confirmation that the Server agrees = to > establish the connection before confirming it to the Client. >=20 > nit: I suggest clarifying the antecedent of "it". >=20 > that SYN. The Transport Converter receives this SYN because it is, > for example, on the path between the remote host and the Client or = it > provides address sharing service for the Client. If the check = fails, >=20 > Is there a reference for "address sharing service"? >=20 > As discussed in [RFC7413], such change to TCP semantic raises two > issues. First, duplicate SYNs can cause problems for some > applications that rely on TCP. Second, TCP suffers from SYN = flooding >=20 > Is it really best to say "some applications" when the onus to prove > replay-safety on a per-protocol basis leads to a need to assume as a > baseline that all protocols are not compatible with TFO until proven > otherwise? >=20 > terminate the downstream connection by using FIN packets. If the > downstream connection terminates with the exchange of FIN packets, >=20 > Why do we have "RST segment" in the previous paragraph but "FIN = packet" > here? >=20 > Section 4.3 >=20 > * Lifetime is the validity lifetime of the entry as assigned > by the Converter. >=20 > Conceptually a lifetime is a "time to survive relative to a given > reference time". If the reference time is "now", this lifetime would > need to be continuously updated; if not, don't we need to also store = the > reference time? (Alternately, just store the expiration time and not > the lifetime.) >=20 > Section 5.1 >=20 > Do we want to say anything about (end-to-end?) MPTCP operation with = the > Transport Converter in the middle? Does it need to do anything other > than just pass packets (and maybe swap out addresses)? >=20 > Section 5.2 >=20 > address, external port number). The external IP address and = external > port number will be then advertised using an out-of-band mechanism = so > that remote hosts can initiate TCP connections to the Client via the > Converter. Note that the external and internal information may be >=20 > Advertised by the Transport Converter or the Client? (We leave it > implicit that the allocated external address/port will be communicated > back to the client by PCP.) >=20 > is found, the Converter silently ignores the message. If an entry = is > found, the Converter inserts an MP_CAPABLE option and Connect TLV in > the SYN packet, rewrites the source IP address to one of its IP > addresses and, eventually, the destination IP address and port = number > in accordance with the information stored in the mapping. SYN+ACK >=20 > Why "eventually"? >=20 > It is out of scope of this document to define specific Convert TLVs > to manage incoming connections. These TLVs can be defined in a > separate document. >=20 > It seems a little bit of a bait-and-switch to do so, given that the > discussion of the example in Figure 6 explicitly says "the Tranport > Convert [sic] inserts a TLV message that indicates the source address > and port number of the remote host". >=20 > Section 6 >=20 > Convert messages may appear only in a SYN, SYN+ACK, or in an ACK = that > is sent shortly after the SYN+ACK. >=20 > Can we be more precise about "shortly after the SYN+ACK" (e.g., > "acknowledging the SYN")? >=20 > Section 6.1 >=20 > Was any consideration given to including a "magic string" in the fixed > header, to provide additional protection against misconfiguration = about > whether Convert is to be used on a given connection? >=20 > The Unassigned field MUST be set to zero in this version of the > protocol. These bits are available for future use. >=20 > But only in a future version, the way this is defined. (That is, = ruling > out using those bits as extension points within version 1.) >=20 > Section 6.2.2 >=20 > capabilities. Assuming the Client is authorized to invoke the > Transport Converter, the latter replies with the Supported TCP > Extensions TLV (Section 6.2.4). >=20 > Just to confirm: based on this design, the Transport Converter = currently > has nothing other than the Client IP address to use as input to this > authorization decision? >=20 > Section 6.2.5 >=20 > We distinguish two types of Connect TLV based on their length: (1) > the Base Connect TLV has a length of 20 bytes and contains a remote >=20 > Which is to say, a Length field containing the value 5. >=20 >=20 > I'm confused about the default options semantics. First we say that = the > default options are those advertised in the Supported TCP Extensions > TLV, which would seem to imply that the converter doesn't support any > extensions that are not listed there. But then we go on to say that = for > an Extended Connect TLV, the options contained in the TLV are > *additional* options that are *added* to the default set of options = ... > but only if the converter supports those options. But if it supports = an > option, wouldn't it already be in the default list, since the default > list is the list of supported options? The way it's currently worded, > the extended connect TLV seems only useful for specifying precise = values > for options that take a value, but not for adding entirely new = options. >=20 > Section 6.2.6 >=20 > by the Server in the SYN+ACK packet. A Transport Converter MUST > return this TLV if the Client sent an Extended Connect TLV and the > connection was accepted by the server. >=20 > Is the converter allowed to return this option if a basic connect was > used? Should the converter always attempt to return this option? >=20 > Section 6.2.7 >=20 > the Client. This Cookie can be configured on the Client by means > that are outside of this document or provided by the Transport > Converter as follows. >=20 > [But not as immediately follows; there's other content in between.] >=20 > Section 6.2.8 >=20 > An Error TLV can be included in the SYN+ACK or an ACK sent shortly > after the SYN+ACK. >=20 > [same comment about "shortly after"] >=20 > encoded in 8 bits. The list of supported versions should be > padded with zeros to end on a 32 bits boundary. >=20 > "should be"? It's a protocol violation to not do something to make it > end on a 32-bit boundary, and putting anything other than zero is = liable > to cause the peer to make bad assumptions, so this seems pretty > mandatory to me. >=20 > Upon receipt of this error code, the remote peer (e.g., Client) > checks whether it supports one of the versions returned by the > peer. The highest common supported version MUST be used by the > remote peer in subsequent exchanges with the peer. >=20 > There doesn't seem to be any protection against version downgrade = (e.g., > by MITM) in this exchange. >=20 > To ease troubleshooting, the value field MUST echo the received > message shifted by one byte to keep to original alignment of the > message. >=20 > I'm not sure what's meant by this "shifted" language is going to be > clear to all readers. (Occurs multiple times.) >=20 > o Not Authorized (32): This error code indicates that the Transport > Converter refused to create a connection because of a lack of > authorization (e.g., administratively prohibited, authorization > failure, invalid Cookie TLV, etc.). The Value field MUST be set >=20 > invalid or missing, IIUC. >=20 > o Unsupported TCP Option (33): A TCP option that the Client > requested to advertise to the final Server cannot be safely used. >=20 > Why the mismatch between "unsupported" and "cannot be safely used"? >=20 > Section 7.6 >=20 > types of Connect TLV. If such a Transport Converter receives a > Connect TLV with the TCP Fast Open cookie option that does not > contain a cookie, it MUST add an empty TCP Fast Open cookie option = in > the SYN sent to the remote server. If such a Transport Converter > receives a Connect TLV with the TCP Fast Open cookie option that > contains a cookie, it MUST copy the TCP Fast Open cookie option in > the SYN sent to the remote server. >=20 > Just to check: we don't need to specify any additional behavior for = the > response (e.g., to give the client the cookie from the server), since > that falls out naturally from the requirement to send the Extended TCP > Header TLV? >=20 > Section 7.7 >=20 > A Transport Converter MUST NOT advertise the TCP-AO option (Kind=3D29)= > in the Supported TCP Extensions TLV. If a Transport Converter > receives a Connect TLV that contains the TCP-AO option, it MUST > reject the establishment of the connection with error code set to > "Unsupported TCP Option", except if the TCP-AO-NAT option is used. >=20 > Perhaps a reminder that, since TCP-AO-NAT is Experimental, such usage = is > not currently defined and must be specified by some other document > before it can be used, would be in order? >=20 > Section 9 >=20 > An implementation needs to check that the TLVs are properly framed > within the boundary indicated by the Total Length in the fixed header. >=20 > Section 9.1 >=20 > processes. As such, it MUST be protected as a core IP router (e.g., > [RFC1812]). >=20 > nit: I don't think the grammar is quite right here; maybe "as = protected > as" or "protected as if it was". >=20 > This document assumes that all network attachments are managed by = the > same administrative entity. Therefore, enforcing anti-spoofing > filters at these network ensures that hosts are not sending traffic > with spoofed source IP addresses. >=20 > Until some network infrastructure equipment gets compromised. (That = is > to say "ensures" may be stronger language than is merited.) >=20 > Section 9.2 >=20 > The Convert Protocol is intended to be used in managed networks = where > end hosts can be identified by their IP address. >=20 > End hosts can always be identified by their IP address in any network > .... subject to spoofing. Perhaps you mean to say "securely = identified"? >=20 > Section 9.4 >=20 > I'm confused why we're talking about an illegitimate converter being > possible given that we assume the network is secure. >=20 > Section 9.5 >=20 > The operator that manages the various network attachments (including > the Transport Converters) can enforce authentication and > authorization policies using appropriate mechanisms. For example, a >=20 > I suggest "has various options for enforcing authentication and > authorization policies"; the current language could be misread as = saying > that such enforcement is optional. >=20 > o The network provider may enforce a policy based upon Access > Control Lists (ACLs), e.g., at a Broadband Network Gateway (BNG) > to control the hosts that are authorized to communicate with a > Transport Converter. These ACLs may be installed as a result of > RADIUS exchanges, e.g., [I-D.boucadair-radext-tcpm-converter]. > This method does not require any interaction with the Transport > Converter for authorization matters. >=20 > o A device that embeds a Transport Converter may also host a RADIUS > client that will solicit an AAA server to check whether > connections received from a given source IP address are = authorized > or not [I-D.boucadair-radext-tcpm-converter]. >=20 > These both seem to require that the network has strong anti-spoofing > protections in place. >=20 > Section 11.1 >=20 > It's not entirely clear that RFC 6978 needs to be normative, given = that > we explicitly do *not* include support for that protocol in this > document (shunting non-standards-track tcp option support to other > documents). >=20 > Section 11.2 >=20 > RFC 1919 might be normative if I had a better understanding of what we > wanted from it (see above). >=20 > I'm surprised that RFC 2782 isn't normative given that SRV discovery > seems like the only defined way to discover the port number of the > convert service. >=20 >=20 >=20 >=20 From nobody Thu Mar 5 03:56:54 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 5D86F3A1246; Thu, 5 Mar 2020 03:56:47 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Suresh Krishnan via Datatracker To: "The IESG" Cc: draft-ietf-tcpm-converters@ietf.org, tcpm-chairs@ietf.org, tcpm@ietf.org, Michael Scharf , michael.scharf@hs-esslingen.de X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Suresh Krishnan Message-ID: <158340940735.14843.15313727261560341716@ietfa.amsl.com> Date: Thu, 05 Mar 2020 03:56:47 -0800 Archived-At: Subject: [tcpm] Suresh Krishnan's No Objection on draft-ietf-tcpm-converters-17: (with COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 11:56:48 -0000 Suresh Krishnan has entered the following ballot position for draft-ietf-tcpm-converters-17: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- I had a similar question as Éric on the handling of ICMP messages and related troubleshooting (specifically I was concerned about the non-Type 1 (Destination Unreachable) messages. I saw the authors responded and I will keep track of the discussion. 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15.20.2772.019; Thu, 5 Mar 2020 13:19:05 +0000 From: "Eric Vyncke (evyncke)" To: "mohamed.boucadair@orange.com" , The IESG CC: "draft-ietf-tcpm-converters@ietf.org" , "tcpm@ietf.org" , Michael Scharf , "tcpm-chairs@ietf.org" Thread-Topic: =?utf-8?B?w4lyaWMgVnluY2tlJ3MgRGlzY3VzcyBvbiBkcmFmdC1pZXRmLXRjcG0tY29u?= =?utf-8?Q?verters-17:_(with_DISCUSS_and_COMMENT)?= Thread-Index: AQHV8KMVSXlWtT5BgkaFkfNQ++7N1ag1f3AwgASRV4A= Date: Thu, 5 Mar 2020 13:19:05 +0000 Message-ID: <84F43283-7103-4D57-8A54-494958EEBD63@cisco.com> References: <158316112770.27414.3186724146499309840@ietfa.amsl.com> <787AE7BB302AE849A7480A190F8B93303145D56F@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> In-Reply-To: <787AE7BB302AE849A7480A190F8B93303145D56F@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> Accept-Language: fr-BE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/10.22.0.200209 authentication-results: spf=none (sender IP is ) smtp.mailfrom=evyncke@cisco.com; 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charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [tcpm] Benjamin Kaduk's Discuss on draft-ietf-tcpm-converters-17: (with DISCUSS and COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 13:20:38 -0000 SGkgQmVuLCANCg0KVGhhbmsgeW91IGZvciB0aGUgZGV0YWlsZWQgcmV2aWV3LiBNdWNoIGFwcHJl Y2lhdGVkIQ0KDQpQbGVhc2Ugc2VlIGlubGluZS4gDQoNCkNoZWVycywNCk1lZA0KDQo+IC0tLS0t TWVzc2FnZSBkJ29yaWdpbmUtLS0tLQ0KPiBEZcKgOiBCZW5qYW1pbiBLYWR1ayB2aWEgRGF0YXRy YWNrZXIgW21haWx0bzpub3JlcGx5QGlldGYub3JnXQ0KPiBFbnZvecOpwqA6IGpldWRpIDUgbWFy cyAyMDIwIDEwOjQ2DQo+IMOAwqA6IFRoZSBJRVNHDQo+IENjwqA6IGRyYWZ0LWlldGYtdGNwbS1j b252ZXJ0ZXJzQGlldGYub3JnOyB0Y3BtLWNoYWlyc0BpZXRmLm9yZzsNCj4gdGNwbUBpZXRmLm9y ZzsgTWljaGFlbCBTY2hhcmY7IG1pY2hhZWwuc2NoYXJmQGhzLWVzc2xpbmdlbi5kZQ0KPiBPYmpl 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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 DA2283A14A2; Thu, 5 Mar 2020 05:33:01 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham 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 gfqdWnFbEj2q; Thu, 5 Mar 2020 05:33:00 -0800 (PST) Received: from server.dnsblock1.com (server.dnsblock1.com [85.13.236.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client 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by server.dnsblock1.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.92) (envelope-from ) id 1j9qcT-00038D-N9; Thu, 05 Mar 2020 13:32:57 +0000 From: Bob Briscoe To: Yoshifumi Nishida , "tcpm@ietf.org Extensions" , Mirja Kuehlewind Cc: tcpm-chairs@ietf.org, =?UTF-8?Q?Ilpo_J=c3=a4rvinen?= References: <60ce5dd7-d5b7-0878-18da-ddcce48c9561@bobbriscoe.net> Message-ID: <21674468-14fa-dd8c-13aa-177153ec0511@bobbriscoe.net> Date: Thu, 5 Mar 2020 13:32:56 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <60ce5dd7-d5b7-0878-18da-ddcce48c9561@bobbriscoe.net> Content-Type: multipart/alternative; boundary="------------5EFDC0C3E945C1BB884D1928" Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com 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: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: Re: [tcpm] intended status of draft-ietf-tcpm-accurate-ecn X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 13:33:02 -0000 This is a multi-part message in MIME format. --------------5EFDC0C3E945C1BB884D1928 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Yoshi, Mirja, (or anyone on the list who can point me at the correct process document) I need advice on whether to take out the text about using an experimental option kind now that AccECN is intended for stds track. Q1. At what point can/should we apply for a new option kind? Q2. Are implementers still expected to use an experimental option kind until a stds track draft is approved as an RFC? This is also pressing for Ilpo, who tells me he is planning to submit his implementation of AccECN to Linux netdev for upstreaming by the end of this week. He expects some discussion so there will be time before it goes through. But I'm sure he wants  to obey the IETF's rules. Bob On 27/02/2020 09:16, Bob Briscoe wrote: > Yoshi, all, > > I am preparing a revision (...-10) with all the recent queued up > changes except those needed to change from EXP to PS. Then I shall > follow that with a second revision (...-11) for the change from EXP to PS. > > Reason: To enable implementers to separate out changes in the diffs > resulting from IETF procedure. > > > Bob > > On 24/01/2020 08:06, Yoshifumi Nishida wrote: >> Hi everyone, >> >> Sorry for taking long time. After several discussions among the >> chairs, we've concluded the rough consensus of the WG is that this >> document should target PS.. >> >> As tcpm is a relatively small community, it's sometimes not easy to >> assess the consensus in the group. >> However, as far as we've checked, most of people don't have issues on >> publishing it as a PS doc. >> >> This will mean the updated version of this draft will require further >> detailed reviews since the current version was written for an >> experimental doc. This might take extra time compared to publishing >> an EXP draft. >> In addition, there are possibilities that other ECN proposals will be >> published in the future (and they can be PS as well). This draft >> should be carefully reviewed not to prevent such activities. >> >> Thanks, >> -- >> Yoshi on behalf of tcpm co-chairs >> >> >> On Fri, Dec 13, 2019 at 1:17 AM Yoshifumi Nishida > > wrote: >> >> Hi folks, >> >> We would like to get feedback for the intended status >> of draft-ietf-tcpm-accurate-ecn. >> The current intended status of this draft is experimental, but >> we've seen some voices that PS is more preferable for the draft >> during Singapore meeting and on the ML. So, we would like to >> check the consensus on it. >> >> There are some on-going related discussions such as flag >> registration policy, SCE, ECN++, etc, however, we believe the >> intended status discussions is independent from them and can >> proceed it separately.. (If you have concerns on it, please share >> your opinion here) >> >> We appreciate your feedback. >> >> Thanks, >> -- >> Yoshi on behalf of tcpm co-chairs. >> >> >> >> _______________________________________________ >> tcpm mailing list >> tcpm@ietf.org >> https://www.ietf.org/mailman/listinfo/tcpm > > -- > ________________________________________________________________ > Bob Briscoehttp://bobbriscoe.net/ -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ --------------5EFDC0C3E945C1BB884D1928 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit Yoshi, Mirja, (or anyone on the list who can point me at the correct process document)

I need advice on whether to take out the text about using an experimental option kind now that AccECN is intended for stds track.
Q1. At what point can/should we apply for a new option kind?
Q2. Are implementers still expected to use an experimental option kind until a stds track draft is approved as an RFC?

This is also pressing for Ilpo, who tells me he is planning to submit his implementation of AccECN to Linux netdev for upstreaming by the end of this week. He expects some discussion so there will be time before it goes through. But I'm sure he wants  to obey the IETF's rules.


Bob

On 27/02/2020 09:16, Bob Briscoe wrote:
Yoshi, all,

I am preparing a revision (...-10) with all the recent queued up changes except those needed to change from EXP to PS. Then I shall follow that with a second revision (...-11) for the change from EXP to PS.

Reason: To enable implementers to separate out changes in the diffs resulting from IETF procedure.


Bob

On 24/01/2020 08:06, Yoshifumi Nishida wrote:
Hi everyone,

Sorry for taking long time. After several discussions among the chairs, we've concluded the rough consensus of the WG is that this document should target PS..

As tcpm is a relatively small community, it's sometimes not easy to assess the consensus in the group.
However, as far as we've checked, most of people don't have issues on publishing it as a PS doc.

This will mean the updated version of this draft will require further detailed reviews since the current version was written for an experimental doc. This might take extra time compared to publishing an EXP draft.
In addition, there are possibilities that other ECN proposals will be published in the future (and they can be PS as well). This draft should be carefully reviewed not to prevent such activities.

Thanks,
--
Yoshi on behalf of tcpm co-chairs


On Fri, Dec 13, 2019 at 1:17 AM Yoshifumi Nishida <nsd.ietf@gmail.com> wrote:
Hi folks,

We would like to get feedback for the intended status of draft-ietf-tcpm-accurate-ecn. 
The current intended status of this draft is experimental, but we've seen some voices that PS is more preferable for the draft during Singapore meeting and on the ML. So, we would like to check the consensus on it.

There are some on-going related discussions such as flag registration policy, SCE, ECN++, etc, however, we believe the intended status discussions is independent from them and can proceed it separately.. (If you have concerns on it, please share your opinion here)

We appreciate your feedback.

Thanks,
--
Yoshi on behalf of tcpm co-chairs.



_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm


-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/
--------------5EFDC0C3E945C1BB884D1928-- From nobody Thu Mar 5 05:42:02 2020 Return-Path: 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 A30463A14E7; Thu, 5 Mar 2020 05:41:58 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=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 iYIxW5ZR6JzD; Thu, 5 Mar 2020 05:41:55 -0800 (PST) Received: from wp513.webpack.hosteurope.de (wp513.webpack.hosteurope.de [IPv6:2a01:488:42:1000:50ed:8223::]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6517B3A14E4; Thu, 5 Mar 2020 05:41:54 -0800 (PST) Received: from p200300dee7239a00e984148d77e3bc6d.dip0.t-ipconnect.de ([2003:de:e723:9a00:e984:148d:77e3:bc6d]); authenticated by wp513.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) id 1j9ql6-00082P-83; Thu, 05 Mar 2020 14:41:52 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: Mirja Kuehlewind In-Reply-To: <21674468-14fa-dd8c-13aa-177153ec0511@bobbriscoe.net> Date: Thu, 5 Mar 2020 14:41:51 +0100 Cc: Yoshifumi Nishida , "tcpm@ietf.org Extensions" , tcpm-chairs@ietf.org, =?utf-8?Q?Ilpo_J=C3=A4rvinen?= Content-Transfer-Encoding: quoted-printable Message-Id: References: <60ce5dd7-d5b7-0878-18da-ddcce48c9561@bobbriscoe.net> <21674468-14fa-dd8c-13aa-177153ec0511@bobbriscoe.net> To: Bob Briscoe X-Mailer: Apple Mail (2.3445.104.11) X-bounce-key: webpack.hosteurope.de;ietf@kuehlewind.net;1583415714;547e883a; X-HE-SMSGID: 1j9ql6-00082P-83 Archived-At: Subject: Re: [tcpm] intended status of draft-ietf-tcpm-accurate-ecn X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 13:41:59 -0000 Inline > On 5. Mar 2020, at 14:32, Bob Briscoe wrote: >=20 > Yoshi, Mirja, (or anyone on the list who can point me at the correct = process document) >=20 https://tools.ietf.org/html/rfc6994 > I need advice on whether to take out the text about using an = experimental option kind now that AccECN is intended for stds track.=20 > Q1. At what point can/should we apply for a new option kind? Options are registered based on standard actions, so they will be = assigned on publication of the RFC. > Q2. Are implementers still expected to use an experimental option kind = until a stds track draft is approved as an RFC? Yes. However, the document should only describe the final option. TFO = notes in the IANA section that the experimental option exists and = implementation should mitigate. >=20 > This is also pressing for Ilpo, who tells me he is planning to submit = his implementation of AccECN to Linux netdev for upstreaming by the end = of this week. He expects some discussion so there will be time before it = goes through. But I'm sure he wants to obey the IETF's rules. I guess the idea is that it doesn=E2=80=99t go into main line kernel = before the RFC is approved=E2=80=A6 I know that=E2=80=99s not the = reality. I guess you can check with Yuchung what he did for TFO but I guess = they=E2=80=99ve upstreamed it before the draft was published... >=20 >=20 > Bob >=20 > On 27/02/2020 09:16, Bob Briscoe wrote: >> Yoshi, all, >>=20 >> I am preparing a revision (...-10) with all the recent queued up = changes except those needed to change from EXP to PS. Then I shall = follow that with a second revision (...-11) for the change from EXP to = PS. >>=20 >> Reason: To enable implementers to separate out changes in the diffs = resulting from IETF procedure. >>=20 >>=20 >> Bob >>=20 >> On 24/01/2020 08:06, Yoshifumi Nishida wrote: >>> Hi everyone, >>>=20 >>> Sorry for taking long time. After several discussions among the = chairs, we've concluded the rough consensus of the WG is that this = document should target PS.. >>>=20 >>> As tcpm is a relatively small community, it's sometimes not easy to = assess the consensus in the group. >>> However, as far as we've checked, most of people don't have issues = on publishing it as a PS doc. >>>=20 >>> This will mean the updated version of this draft will require = further detailed reviews since the current version was written for an = experimental doc. This might take extra time compared to publishing an = EXP draft. >>> In addition, there are possibilities that other ECN proposals will = be published in the future (and they can be PS as well). This draft = should be carefully reviewed not to prevent such activities. >>>=20 >>> Thanks, >>> -- >>> Yoshi on behalf of tcpm co-chairs >>>=20 >>>=20 >>> On Fri, Dec 13, 2019 at 1:17 AM Yoshifumi Nishida = wrote: >>> Hi folks, >>>=20 >>> We would like to get feedback for the intended status of = draft-ietf-tcpm-accurate-ecn.=20 >>> The current intended status of this draft is experimental, but we've = seen some voices that PS is more preferable for the draft during = Singapore meeting and on the ML. So, we would like to check the = consensus on it. >>>=20 >>> There are some on-going related discussions such as flag = registration policy, SCE, ECN++, etc, however, we believe the intended = status discussions is independent from them and can proceed it = separately.. (If you have concerns on it, please share your opinion = here) >>>=20 >>> We appreciate your feedback. >>>=20 >>> Thanks, >>> -- >>> Yoshi on behalf of tcpm co-chairs. >>>=20 >>>=20 >>>=20 >>>=20 >>> _______________________________________________ >>> tcpm mailing list >>>=20 >>> tcpm@ietf.org >>> https://www.ietf.org/mailman/listinfo/tcpm >>=20 >> --=20 >> ________________________________________________________________ >> Bob Briscoe =20 >> http://bobbriscoe.net/ >=20 > --=20 > ________________________________________________________________ > Bob Briscoe =20 > http://bobbriscoe.net/ From nobody Thu Mar 5 05:46:38 2020 Return-Path: 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 C448D3A14FC; Thu, 5 Mar 2020 05:46:31 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 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, "tcpm@ietf.org" , Michael Scharf , "tcpm-chairs@ietf.org" Thread-Topic: =?utf-8?B?w4lyaWMgVnluY2tlJ3MgRGlzY3VzcyBvbiBkcmFmdC1pZXRmLXRjcG0tY29u?= =?utf-8?Q?verters-17:_(with_DISCUSS_and_COMMENT)?= Thread-Index: AQHV8KMVSXlWtT5BgkaFkfNQ++7N1ag1f3AwgASRV4D///CKAA== Date: Thu, 5 Mar 2020 13:46:27 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93303145F926@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> References: <158316112770.27414.3186724146499309840@ietfa.amsl.com> <787AE7BB302AE849A7480A190F8B93303145D56F@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> <84F43283-7103-4D57-8A54-494958EEBD63@cisco.com> In-Reply-To: <84F43283-7103-4D57-8A54-494958EEBD63@cisco.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [tcpm] =?utf-8?q?=C3=89ric_Vyncke=27s_Discuss_on_draft-ietf-tcpm?= =?utf-8?q?-converters-17=3A_=28with_DISCUSS_and_COMMENT=29?= X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 13:46:32 -0000 SGkgRXJpYywgDQoNClRoYW5rIHlvdSBmb3IgdGhlIGZvbGxvdy11cC4NCg0KUGxlYXNlIHNlZSBp bmxpbmUuIA0KDQpDaGVlcnMsDQpNZWQNCg0KPiAtLS0tLU1lc3NhZ2UgZCdvcmlnaW5lLS0tLS0N Cj4gRGXCoDogRXJpYyBWeW5ja2UgKGV2eW5ja2UpIFttYWlsdG86ZXZ5bmNrZUBjaXNjby5jb21d DQo+IEVudm95w6nCoDogamV1ZGkgNSBtYXJzIDIwMjAgMTQ6MTkNCj4gw4DCoDogQk9VQ0FEQUlS IE1vaGFtZWQgVEdJL09MTjsgVGhlIElFU0cNCj4gQ2PCoDogZHJhZnQtaWV0Zi10Y3BtLWNvbnZl cnRlcnNAaWV0Zi5vcmc7IHRjcG1AaWV0Zi5vcmc7IE1pY2hhZWwNCj4gU2NoYXJmOyB0Y3BtLWNo YWlyc0BpZXRmLm9yZw0KPiBPYmpldMKgOiBSZTogw4lyaWMgVnluY2tlJ3MgRGlzY3VzcyBvbiBk cmFmdC1pZXRmLXRjcG0tY29udmVydGVycy0xNzoNCj4gKHdpdGggRElTQ1VTUyBhbmQgQ09NTUVO 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dmUgRW5nbGlzaCBzcGVha2VyLg0KICAgID4gICAgID4NCiAgICA+ICAgICA+IC0tIFNlY3Rpb24g NC4zIC0tDQogICAgPiAgICAgPiBUaGUgY2FwdGlvbiBiZWxvdyBmaWd1cmUgNyBlbmRzIHdpdGgg IihUQ1ApIiB0aGF0IGlzIG5vdCB0aGUNCiAgICA+IGFjcm9ueW0NCiAgICA+ICAgICA+IG9mDQog ICAgPiAgICAgPiAiVHJhbnNwb3J0IFNlc3Npb24gRW50cnkiLiBJcyBpdCBleHBlY3RlZCA/DQog ICAgPiANCiAgICA+ICAgICBbTWVkXSBEZWxldGVkLCB0aGFua3MuDQogICAgPiANCiAgICA+ICAg ICBXZSB1c2VkIHRvIGhhdmUgYW5vdGhlciBleGFtcGxlIHdpdGggTVBUQ1Agc3BlY2lmaWNzIGhl bmNlIHRoYXQNCiAgICA+IG1lbnRpb24uDQogICAgPiANCiAgICA+IA0KICAgID4gDQogICAgDQog ICAgDQoNCg== From nobody Thu Mar 5 07:26:18 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 6DB693A1653; Thu, 5 Mar 2020 07:25:24 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Alexey Melnikov via Datatracker To: "The IESG" Cc: draft-ietf-tcpm-converters@ietf.org, tcpm-chairs@ietf.org, tcpm@ietf.org, Michael Scharf , michael.scharf@hs-esslingen.de X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Alexey Melnikov Message-ID: <158342192442.14694.7048976169937659738@ietfa.amsl.com> Date: Thu, 05 Mar 2020 07:25:24 -0800 Archived-At: Subject: [tcpm] Alexey Melnikov's No Objection on draft-ietf-tcpm-converters-17: (with COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 15:25:25 -0000 Alexey Melnikov has entered the following ballot position for draft-ietf-tcpm-converters-17: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- It is not very clear whether the WG expects many future version of this protocol. Version compatibility story is not very clear in this document, so the WG should think about it. 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by opfedar07.francetelecom.fr (ESMTP service) with ESMTP id 48YGmg1WBHz5vR7; Thu, 5 Mar 2020 17:44:19 +0100 (CET) Received: from OPEXCAUBMA2.corporate.adroot.infra.ftgroup ([fe80::e878:bd0:c89e:5b42]) by OPEXCAUBM5D.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0487.000; Thu, 5 Mar 2020 17:44:18 +0100 From: To: Alexey Melnikov , The IESG CC: "draft-ietf-tcpm-converters@ietf.org" , "tcpm-chairs@ietf.org" , "tcpm@ietf.org" , Michael Scharf Thread-Topic: Alexey Melnikov's No Objection on draft-ietf-tcpm-converters-17: (with COMMENT) Thread-Index: AQHV8wJMEb9y4ERdakCTEn7hi/eqWqg6MAYA Date: Thu, 5 Mar 2020 16:44:18 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93303145FC04@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> References: <158342192442.14694.7048976169937659738@ietfa.amsl.com> In-Reply-To: <158342192442.14694.7048976169937659738@ietfa.amsl.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [tcpm] Alexey Melnikov's No Objection on draft-ietf-tcpm-converters-17: (with COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 16:44:24 -0000 SGkgQWxleGV5LA0KDQpUaGFuayB5b3UgZm9yIHRoZSBjb21tZW50LiANCg0KV2UgZG8gYWxyZWFk eSBoYXZlIHRoZSBmb2xsb3dpbmcgZm9yIHZlcnNpb24gbmVnb3RpYXRpb246DQoNCiAgIG8gIFVu c3VwcG9ydGVkIFZlcnNpb24gKDApOiBUaGUgdmVyc2lvbiBudW1iZXIgaW5kaWNhdGVkIGluIHRo ZSBmaXhlZA0KICAgICAgaGVhZGVyIG9mIGEgbWVzc2FnZSByZWNlaXZlZCBmcm9tIGEgcGVlciBp cyBub3Qgc3VwcG9ydGVkLg0KDQogICAgICBUaGlzIGVycm9yIGNvZGUgTVVTVCBiZSBnZW5lcmF0 ZWQgYnkgYSBwZWVyIChlLmcuLCAgVHJhbnNwb3J0DQogICAgICBDb252ZXJ0ZXIpIHdoZW4gaXQg 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ZXhwZWN0cyBtYW55IGZ1dHVyZSB2ZXJzaW9uIG9mDQo+IHRoaXMNCj4gcHJvdG9jb2wuIFZlcnNp b24gY29tcGF0aWJpbGl0eSBzdG9yeSBpcyBub3QgdmVyeSBjbGVhciBpbiB0aGlzDQo+IGRvY3Vt ZW50LCBzbw0KPiB0aGUgV0cgc2hvdWxkIHRoaW5rIGFib3V0IGl0Lg0KPiANCj4gDQoNCg== From nobody Thu Mar 5 09:11:31 2020 Return-Path: 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 5BA103A0C9B; Wed, 4 Mar 2020 03:05:48 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.901 X-Spam-Level: X-Spam-Status: No, score=-0.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, CTE_8BIT_MISMATCH=0.999, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no 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 qg9IVNv5JXQb; Wed, 4 Mar 2020 03:05:47 -0800 (PST) Received: from rfc-editor.org (rfc-editor.org [4.31.198.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 50BF53A0C88; Wed, 4 Mar 2020 03:05:47 -0800 (PST) Received: by rfc-editor.org (Postfix, from userid 30) id A7280F40721; Wed, 4 Mar 2020 03:05:25 -0800 (PST) To: elliott.ecton@netpp.com, rhee@ncsu.edu, xu@unl.edu, sangtae.ha@colorado.edu, alexander.zimmermann@rwth-aachen.de, lars@netapp.com, rs.ietf@gmx.at X-PHP-Originating-Script: 30:errata_mail_lib.php From: RFC Errata System Cc: ietf@kuehlewind.net, iesg@ietf.org, tcpm@ietf.org, rfc-editor@rfc-editor.org Content-Type: text/plain; charset=UTF-8 Message-Id: <20200304110525.A7280F40721@rfc-editor.org> Date: Wed, 4 Mar 2020 03:05:25 -0800 (PST) Archived-At: X-Mailman-Approved-At: Thu, 05 Mar 2020 09:11:30 -0800 Subject: [tcpm] [Errata Rejected] RFC8312 (5907) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Mar 2020 11:05:54 -0000 The following errata report has been rejected for RFC8312, "CUBIC for Fast Long-Distance Networks". -------------------------------------- You may review the report below and at: https://www.rfc-editor.org/errata/eid5907 -------------------------------------- Status: Rejected Type: Technical Reported by: Elliott Ecton Date Reported: 2019-11-14 Rejected by: Mirja Kühlewind (IESG) Section: 5.1 Original Text ------------- +--------+----------+-----------+------------+-----------+----------+ | Loss | Average | Average | CUBIC | CUBIC | CUBIC | | Rate P | TCP W | HSTCP W | (C=0.04) | (C=0.4) | (C=4) | +--------+----------+-----------+------------+-----------+----------+ | 10^-2 | 12 | 12 | 12 | 12 | 12 | | 10^-3 | 38 | 38 | 38 | 38 | 59 | | 10^-4 | 120 | 263 | 120 | 187 | 333 | | 10^-5 | 379 | 1795 | 593 | 1054 | 1874 | | 10^-6 | 1200 | 12279 | 3332 | 5926 | 10538 | | 10^-7 | 3795 | 83981 | 18740 | 33325 | 59261 | | 10^-8 | 12000 | 574356 | 105383 | 187400 | 333250 | +--------+----------+-----------+------------+-----------+----------+ Table 1 Corrected Text -------------- +--------+----------+-----------+------------+-----------+----------+ | Loss | Average | Average | CUBIC | CUBIC | CUBIC | | Rate P | TCP W | HSTCP W | (C=0.04) | (C=0.4) | (C=4) | +--------+----------+-----------+------------+-----------+----------+ | 10^-2 | 12 | 12 | 3 | 6 | 11 | | 10^-3 | 38 | 38 | 19 | 33 | 59 | | 10^-4 | 120 | 263 | 120 | 187 | 333 | | 10^-5 | 379 | 1795 | 593 | 1054 | 1874 | | 10^-6 | 1200 | 12279 | 3332 | 5926 | 10538 | | 10^-7 | 3795 | 83981 | 18740 | 33325 | 59261 | | 10^-8 | 12000 | 574356 | 105383 | 187400 | 333250 | +--------+----------+-----------+------------+-----------+----------+ Table 1 Notes ----- The CUBIC average window sizes for 10^2 and 10^3 are incorrect in the original text using expression 6. --VERIFIER NOTES-- See Section 4.2. on how Cubic calculates the congestion window in TCP-Friendly Region. -------------------------------------- RFC8312 (draft-ietf-tcpm-cubic-07) -------------------------------------- Title : CUBIC for Fast Long-Distance Networks Publication Date : February 2018 Author(s) : I. Rhee, L. Xu, S. Ha, A. Zimmermann, L. Eggert, R. Scheffenegger Category : INFORMATIONAL Source : TCP Maintenance and Minor Extensions Area : Transport Stream : IETF Verifying Party : IESG From nobody Thu Mar 5 09:11:36 2020 Return-Path: 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 98F443A0C7B; Wed, 4 Mar 2020 03:10:49 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.901 X-Spam-Level: X-Spam-Status: No, score=-0.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, CTE_8BIT_MISMATCH=0.999, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no 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 B3M52s66m7-C; Wed, 4 Mar 2020 03:10:48 -0800 (PST) Received: from rfc-editor.org (rfc-editor.org [4.31.198.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6E8053A0C5C; Wed, 4 Mar 2020 03:10:47 -0800 (PST) Received: by rfc-editor.org (Postfix, from userid 30) id 37A9CF40723; Wed, 4 Mar 2020 03:10:26 -0800 (PST) To: elliott.ecton@netpp.com, rhee@ncsu.edu, xu@unl.edu, sangtae.ha@colorado.edu, alexander.zimmermann@rwth-aachen.de, lars@netapp.com, rs.ietf@gmx.at X-PHP-Originating-Script: 30:errata_mail_lib.php From: RFC Errata System Cc: ietf@kuehlewind.net, iesg@ietf.org, tcpm@ietf.org, rfc-editor@rfc-editor.org Content-Type: text/plain; charset=UTF-8 Message-Id: <20200304111026.37A9CF40723@rfc-editor.org> Date: Wed, 4 Mar 2020 03:10:26 -0800 (PST) Archived-At: X-Mailman-Approved-At: Thu, 05 Mar 2020 09:11:30 -0800 Subject: [tcpm] [Errata Rejected] RFC8312 (5909) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Mar 2020 11:10:50 -0000 The following errata report has been rejected for RFC8312, "CUBIC for Fast Long-Distance Networks". -------------------------------------- You may review the report below and at: https://www.rfc-editor.org/errata/eid5909 -------------------------------------- Status: Rejected Type: Technical Reported by: Elliott Ecton Date Reported: 2019-11-14 Rejected by: Mirja Kühlewind (IESG) Section: 5.1 Original Text ------------- +--------+-----------+-----------+------------+-----------+---------+ | Loss | Average | Average | CUBIC | CUBIC | CUBIC | | Rate P | TCP W | HSTCP W | (C=0.04) | (C=0.4) | (C=4) | +--------+-----------+-----------+------------+-----------+---------+ | 10^-2 | 12 | 12 | 12 | 12 | 12 | | 10^-3 | 38 | 38 | 38 | 38 | 38 | | 10^-4 | 120 | 263 | 120 | 120 | 120 | | 10^-5 | 379 | 1795 | 379 | 379 | 379 | | 10^-6 | 1200 | 12279 | 1200 | 1200 | 1874 | | 10^-7 | 3795 | 83981 | 3795 | 5926 | 10538 | | 10^-8 | 12000 | 574356 | 18740 | 33325 | 59261 | +--------+-----------+-----------+------------+-----------+---------+ Table 2 Corrected Text -------------- +--------+-----------+-----------+------------+-----------+---------+ | Loss | Average | Average | CUBIC | CUBIC | CUBIC | | Rate P | TCP W | HSTCP W | (C=0.04) | (C=0.4) | (C=4) | +--------+-----------+-----------+------------+-----------+---------+ | 10^-2 | 12 | 12 | 1 | 1 | 2 | | 10^-3 | 38 | 38 | 3 | 6 | 11 | | 10^-4 | 120 | 263 | 19 | 33 | 59 | | 10^-5 | 379 | 1795 | 105 | 187 | 333 | | 10^-6 | 1200 | 12279 | 593 | 1054 | 1874 | | 10^-7 | 3795 | 83981 | 3332 | 5926 | 10538 | | 10^-8 | 12000 | 574356 | 18740 | 33325 | 59261 | +--------+-----------+-----------+------------+-----------+---------+ Table 2 Notes ----- The average window size for the CUBIC columns were mostly incorrect in table 2. Corrected them using expression 6 --VERIFIER NOTES-- See Section 4.2. on how Cubic calculates the congestion window in TCP-Friendly Region. -------------------------------------- RFC8312 (draft-ietf-tcpm-cubic-07) -------------------------------------- Title : CUBIC for Fast Long-Distance Networks Publication Date : February 2018 Author(s) : I. Rhee, L. Xu, S. Ha, A. Zimmermann, L. Eggert, R. Scheffenegger Category : INFORMATIONAL Source : TCP Maintenance and Minor Extensions Area : Transport Stream : IETF Verifying Party : IESG From nobody Thu Mar 5 09:11:39 2020 Return-Path: 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 4918A3A0C8B for ; Wed, 4 Mar 2020 03:13:09 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=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 3wrh_pEd39cB for ; Wed, 4 Mar 2020 03:13:06 -0800 (PST) Received: from wp513.webpack.hosteurope.de (wp513.webpack.hosteurope.de [IPv6:2a01:488:42:1000:50ed:8223::]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 794A33A0C88 for ; Wed, 4 Mar 2020 03:13:06 -0800 (PST) Received: from p200300dee7239a0084809b28d0f22131.dip0.t-ipconnect.de ([2003:de:e723:9a00:8480:9b28:d0f2:2131]); authenticated by wp513.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) id 1j9RxT-0007AJ-Rk; Wed, 04 Mar 2020 12:12:59 +0100 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: Mirja Kuehlewind In-Reply-To: Date: Wed, 4 Mar 2020 12:12:59 +0100 Cc: rhee@ncsu.edu, Lisong Xu , Sangtae Ha , alexander.zimmermann@rwth-aachen.de, "Eggert, Lars" , Richard Scheffenegger , Magnus Westerlund , "Scharf, Michael" , Michael Tuexen , Yoshifumi Nishida , tcpm , Elliott Ecton Content-Transfer-Encoding: quoted-printable Message-Id: References: <20191114020710.3359AF406D8@rfc-editor.org> To: Neal Cardwell X-Mailer: Apple Mail (2.3445.104.11) X-bounce-key: webpack.hosteurope.de;ietf@kuehlewind.net;1583320386;e98f2ae6; X-HE-SMSGID: 1j9RxT-0007AJ-Rk Archived-At: X-Mailman-Approved-At: Thu, 05 Mar 2020 09:11:30 -0800 Subject: Re: [tcpm] [Technical Errata Reported] RFC8312 (5907) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Mar 2020 11:13:09 -0000 Hi Neal, hi all, I rejected this errata, as I think you are right about section 4.2. = However, the text in section 5.1 does not really indicate that this is = the case, so I guess we could file a separate editorial errata to = clarify this. Do the authors have any opinions here? Mirja > On 15. Nov 2019, at 20:54, Neal Cardwell wrote: >=20 > On Thu, Nov 14, 2019 at 12:53 PM Neal Cardwell = wrote: >>=20 >> On Thu, Nov 14, 2019 at 12:12 PM RFC Errata System >> wrote: >>>=20 >>> The following errata report has been submitted for RFC8312, >>> "CUBIC for Fast Long-Distance Networks". >>>=20 >>> -------------------------------------- >>> You may review the report below and at: >>> https://www.rfc-editor.org/errata/eid5907 >>>=20 >>> -------------------------------------- >>> Type: Technical >>> Reported by: Elliott Ecton >>>=20 >>> Section: 5.1 >>>=20 >>> Original Text >>> ------------- >>> = +--------+----------+-----------+------------+-----------+----------+ >>> | Loss | Average | Average | CUBIC | CUBIC | = CUBIC | >>> | Rate P | TCP W | HSTCP W | (C=3D0.04) | (C=3D0.4) | = (C=3D4) | >>> = +--------+----------+-----------+------------+-----------+----------+ >>> | 10^-2 | 12 | 12 | 12 | 12 | = 12 | >>> | 10^-3 | 38 | 38 | 38 | 38 | = 59 | >>> | 10^-4 | 120 | 263 | 120 | 187 | = 333 | >>> | 10^-5 | 379 | 1795 | 593 | 1054 | = 1874 | >>> | 10^-6 | 1200 | 12279 | 3332 | 5926 | = 10538 | >>> | 10^-7 | 3795 | 83981 | 18740 | 33325 | = 59261 | >>> | 10^-8 | 12000 | 574356 | 105383 | 187400 | = 333250 | >>> = +--------+----------+-----------+------------+-----------+----------+ >>>=20 >>> Table 1 >>>=20 >>> Corrected Text >>> -------------- >>> = +--------+----------+-----------+------------+-----------+----------+ >>> | Loss | Average | Average | CUBIC | CUBIC | = CUBIC | >>> | Rate P | TCP W | HSTCP W | (C=3D0.04) | (C=3D0.4) | = (C=3D4) | >>> = +--------+----------+-----------+------------+-----------+----------+ >>> | 10^-2 | 12 | 12 | 3 | 6 | = 11 | >>> | 10^-3 | 38 | 38 | 19 | 33 | = 59 | >>> | 10^-4 | 120 | 263 | 120 | 187 | = 333 | >>> | 10^-5 | 379 | 1795 | 593 | 1054 | = 1874 | >>> | 10^-6 | 1200 | 12279 | 3332 | 5926 | = 10538 | >>> | 10^-7 | 3795 | 83981 | 18740 | 33325 | = 59261 | >>> | 10^-8 | 12000 | 574356 | 105383 | 187400 | = 333250 | >>> = +--------+----------+-----------+------------+-----------+----------+ >>>=20 >>> Table 1 >>>=20 >>> Notes >>> ----- >>> The CUBIC average window sizes for 10^2 and 10^3 are incorrect in = the original text using expression 6. >>=20 >> I strongly suspect that the original text is correct. >>=20 >> Note that the proposed edit would cause the average congestion window >> size of CUBIC to be below that of "TCP W", the Reno [RFC5681] window, >> in the cases with loss rates of 10^-2 and 10^-3. But as mentioned in >> section 4.2. "TCP-Friendly Region", where the native CUBIC curve >> computation produces a target congestion window that is lower than = the >> congestion window Reno would use, the CUBIC algorithm instead uses = the >> Reno target congestion window. So the average congestion window size >> of CUBIC should not be below that of Reno. I believe that is why in >> the original table the average congestion window for "TCP W" and = CUBIC >> match in cases with loss rates of 10^-2 and 10^-3 and with CUBIC = using >> C=3D0.04 or C=3D0.4. >>=20 >> Are there tests or simulations showing CUBIC achieving a lower >> congestion window in these cases with loss rates of 10^-2 and 10^-3? >>=20 >> best, >> neal >=20 > I got a bounce from my "reply-all". It seems there was a typo in the > e-mail address of the report, and it should have been: > Elliott Ecton > ...rather than: > Elliott Ecton >=20 > I am following up to make sure the elliott.ecton@netapp.com address > has the reply and the thread has the correct e-mail address. >=20 > best, > neal >=20 From nobody Thu Mar 5 10:07:48 2020 Return-Path: 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 172833A0897; Thu, 5 Mar 2020 10:07:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.621 X-Spam-Level: X-Spam-Status: No, score=-1.621 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, KHOP_HELO_FCRDNS=0.276, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=no 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 bCigu9vnB2LC; Thu, 5 Mar 2020 10:07:44 -0800 (PST) Received: from gndrsh.dnsmgr.net (br1.CN84in.dnsmgr.net [69.59.192.140]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7C62D3A088F; Thu, 5 Mar 2020 10:07:44 -0800 (PST) Received: from gndrsh.dnsmgr.net (localhost [127.0.0.1]) by gndrsh.dnsmgr.net (8.13.3/8.13.3) with ESMTP id 025I6tNK042470; Thu, 5 Mar 2020 10:06:55 -0800 (PST) (envelope-from ietf@gndrsh.dnsmgr.net) Received: (from ietf@localhost) by gndrsh.dnsmgr.net (8.13.3/8.13.3/Submit) id 025I6tmo042469; Thu, 5 Mar 2020 10:06:55 -0800 (PST) (envelope-from ietf) From: "Rodney W. Grimes" Message-Id: <202003051806.025I6tmo042469@gndrsh.dnsmgr.net> In-Reply-To: To: Mirja Kuehlewind Date: Thu, 5 Mar 2020 10:06:55 -0800 (PST) CC: Bob Briscoe , =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= , "tcpm@ietf.org Extensions" , tcpm-chairs@ietf.org X-Mailer: ELM [version 2.4ME+ PL121h (25)] MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII Archived-At: Subject: Re: [tcpm] intended status of draft-ietf-tcpm-accurate-ecn X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2020 18:07:46 -0000 > Inline > > > On 5. Mar 2020, at 14:32, Bob Briscoe wrote: > > > > Yoshi, Mirja, (or anyone on the list who can point me at the correct process document) > > > > https://tools.ietf.org/html/rfc6994 > > > I need advice on whether to take out the text about using an experimental option kind now that AccECN is intended for stds track. > > Q1. At what point can/should we apply for a new option kind? > > Options are registered based on standard actions, so they will be assigned on publication of the RFC. > > > Q2. Are implementers still expected to use an experimental option kind until a stds track draft is approved as an RFC? > > Yes. However, the document should only describe the final option. TFO notes in the IANA section that the experimental option exists and implementation should mitigate. > > > > > This is also pressing for Ilpo, who tells me he is planning to submit his implementation of AccECN to Linux netdev for upstreaming by the end of this week. He expects some discussion so there will be time before it goes through. But I'm sure he wants to obey the IETF's rules. > > I guess the idea is that it doesn?t go into main line kernel before the RFC is approved? I know that?s not the reality. Though this may not be the reality what should occur is anything not RFC approved should be off by default and require some user interaction to enable. Traditionally from my experience (4 decades?) this is how "new" things have been handled. It might be desirable to have a document discussing this issue for implementors and vendors? > > I guess you can check with Yuchung what he did for TFO but I guess they?ve upstreamed it before the draft was published... I think you mean RFC published? Drafts are "published" when submitted to the IETF. > > > > > > > Bob > > > > On 27/02/2020 09:16, Bob Briscoe wrote: > >> Yoshi, all, > >> > >> I am preparing a revision (...-10) with all the recent queued up changes except those needed to change from EXP to PS. Then I shall follow that with a second revision (...-11) for the change from EXP to PS. > >> > >> Reason: To enable implementers to separate out changes in the diffs resulting from IETF procedure. > >> > >> > >> Bob > >> > >> On 24/01/2020 08:06, Yoshifumi Nishida wrote: > >>> Hi everyone, > >>> > >>> Sorry for taking long time. After several discussions among the chairs, we've concluded the rough consensus of the WG is that this document should target PS.. > >>> > >>> As tcpm is a relatively small community, it's sometimes not easy to assess the consensus in the group. > >>> However, as far as we've checked, most of people don't have issues on publishing it as a PS doc. > >>> > >>> This will mean the updated version of this draft will require further detailed reviews since the current version was written for an experimental doc. This might take extra time compared to publishing an EXP draft. > >>> In addition, there are possibilities that other ECN proposals will be published in the future (and they can be PS as well). This draft should be carefully reviewed not to prevent such activities. > >>> > >>> Thanks, > >>> -- > >>> Yoshi on behalf of tcpm co-chairs > >>> > >>> > >>> On Fri, Dec 13, 2019 at 1:17 AM Yoshifumi Nishida wrote: > >>> Hi folks, > >>> > >>> We would like to get feedback for the intended status of draft-ietf-tcpm-accurate-ecn. > >>> The current intended status of this draft is experimental, but we've seen some voices that PS is more preferable for the draft during Singapore meeting and on the ML. So, we would like to check the consensus on it. > >>> > >>> There are some on-going related discussions such as flag registration policy, SCE, ECN++, etc, however, we believe the intended status discussions is independent from them and can proceed it separately.. (If you have concerns on it, please share your opinion here) > >>> > >>> We appreciate your feedback. > >>> > >>> Thanks, > >>> -- > >>> Yoshi on behalf of tcpm co-chairs. > >>> > >>> > >>> > >>> > >>> _______________________________________________ > >>> tcpm mailing list > >>> > >>> tcpm@ietf.org > >>> https://www.ietf.org/mailman/listinfo/tcpm > >> > >> -- > >> ________________________________________________________________ > >> Bob Briscoe > >> http://bobbriscoe.net/ > > > > -- > > ________________________________________________________________ > > Bob Briscoe > > http://bobbriscoe.net/ > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm > > -- Rod Grimes rgrimes@freebsd.org From nobody Thu Mar 5 18:17:42 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 2065F3A10FE; Thu, 5 Mar 2020 18:17:36 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: internet-drafts@ietf.org To: Cc: tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: tcpm@ietf.org Message-ID: <158346105599.14698.7704670512603338064@ietfa.amsl.com> Date: Thu, 05 Mar 2020 18:17:36 -0800 Archived-At: Subject: [tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-10.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2020 02:17:36 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. Title : More Accurate ECN Feedback in TCP Authors : Bob Briscoe Mirja Kühlewind Richard Scheffenegger Filename : draft-ietf-tcpm-accurate-ecn-10.txt Pages : 57 Date : 2020-03-05 Abstract: Explicit Congestion Notification (ECN) is a mechanism where network nodes can mark IP packets instead of dropping them to indicate incipient congestion to the end-points. Receivers with an ECN- capable transport protocol feed back this information to the sender. ECN is specified for TCP in such a way that only one feedback signal can be transmitted per Round-Trip Time (RTT). Recent new TCP mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP) or Low Latency Low Loss Scalable Throughput (L4S) need more accurate ECN feedback information whenever more than one marking is received in one RTT. This document specifies an experimental scheme to provide more than one feedback signal per RTT in the TCP header. Given TCP header space is scarce, it allocates a reserved header bit, that was previously used for the ECN-Nonce which has now been declared historic. It also overloads the two existing ECN flags in the TCP header. The resulting extra space is exploited to feed back the IP-ECN field received during the 3-way handshake as well. Supplementary feedback information can optionally be provided in a new TCP option, which is never used on the TCP SYN. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-10 https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn-10 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-10 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Thu Mar 5 18:24:54 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 3F7983A112F; Thu, 5 Mar 2020 18:24:41 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: internet-drafts@ietf.org To: Cc: tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: tcpm@ietf.org Message-ID: <158346148117.14598.16599499289032047458@ietfa.amsl.com> Date: Thu, 05 Mar 2020 18:24:41 -0800 Archived-At: Subject: [tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-11.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2020 02:24:41 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. Title : More Accurate ECN Feedback in TCP Authors : Bob Briscoe Mirja Kühlewind Richard Scheffenegger Filename : draft-ietf-tcpm-accurate-ecn-11.txt Pages : 58 Date : 2020-03-05 Abstract: Explicit Congestion Notification (ECN) is a mechanism where network nodes can mark IP packets instead of dropping them to indicate incipient congestion to the end-points. Receivers with an ECN- capable transport protocol feed back this information to the sender. ECN is specified for TCP in such a way that only one feedback signal can be transmitted per Round-Trip Time (RTT). Recent new TCP mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP) or Low Latency Low Loss Scalable Throughput (L4S) need more accurate ECN feedback information whenever more than one marking is received in one RTT. This document specifies a scheme to provide more than one feedback signal per RTT in the TCP header. Given TCP header space is scarce, it allocates a reserved header bit, that was previously used for the ECN-Nonce which has now been declared historic. It also overloads the two existing ECN flags in the TCP header. The resulting extra space is exploited to feed back the IP- ECN field received during the 3-way handshake as well. Supplementary feedback information can optionally be provided in a new TCP option, which is never used on the TCP SYN. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11 https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn-11 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-11 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Thu Mar 5 19:34:01 2020 Return-Path: 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 B24C73A1249 for ; Thu, 5 Mar 2020 19:33:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham 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 4pJHVn7wF34D for ; Thu, 5 Mar 2020 19:33:56 -0800 (PST) Received: from server.dnsblock1.com (server.dnsblock1.com [85.13.236.178]) (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 1EB803A1247 for ; Thu, 5 Mar 2020 19:33:55 -0800 (PST) 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:Cc:From:References: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=Kso24lpfS2FqKyY5INHvjOrA45bq0lCswg/+uOdy3Dg=; b=whXtkF+Fc/iKvYnrj/ibYeLqz z5QMtLpDBbbyCsvkDU8c+8DCUQxtDhUyrK8LWoNNwXncIuJE1CY3Ktgbt1UU648I0uWuP+Qeoyv2f 01FvINg58DkEQlbbk+eSIOTwSQPfXGevBt8NjF5saSU/GjA51ntDuB5jpezeRzwzZSSonmbAs0o/6 ZuIM769mykXqgCb9dMxWeyZ+Q4/Mq7DHVmtsIpEXFx+RhgdAayN+Q7TBe18dw9PuMTgNtYoiLmTnf TfOUmXsmYD/g5O2ZRuIQLRE8NwQBORCUmFE7TbPrUjtpby0uQucdtA4lecTRPma2785Equo7Whkwf BWh/O3tbg==; Received: from [31.185.128.125] (port=56092 helo=[192.168.0.6]) by server.dnsblock1.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.92) (envelope-from ) id 1jA3kH-0005Xf-0i; Fri, 06 Mar 2020 03:33:53 +0000 To: tcpm IETF list References: <158346148155.14598.11708593959161765913@ietfa.amsl.com> From: Bob Briscoe Cc: Richard Scheffenegger , Mirja Kuehlewind Message-ID: <31786997-b4d6-0410-4d27-beaecab11056@bobbriscoe.net> Date: Fri, 6 Mar 2020 03:33:50 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <158346148155.14598.11708593959161765913@ietfa.amsl.com> Content-Type: multipart/alternative; boundary="------------8BF52907CC74FB7A5743D037" Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com 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: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: Re: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-ecn-11.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2020 03:34:00 -0000 This is a multi-part message in MIME format. --------------8BF52907CC74FB7A5743D037 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit tcpm, You will have seen draft-10 then draft-11 in quick succession, as already explained. The diffs from draft-09 to -10 were those that had built up since Jul'19. The diffs from draft-10 to -11 were solely those for the change from EXP track to STD track. Draft-10 doesn't seem to display in the list of links to each version, but you can manually write the URL. The main technical changes in draft-10 were numerous - many will be recognized from list discussion since Jul'19. Particular thanks to Ilpo Järvinen who identified many niggles (and their solutions) while writing and testing a full Linux implementation (based on Olivier Tilmans's, in turn based on Mirja's). * Allowed 2 different orders of the fields in the AccECN Option * Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also on first data packet o greatly simplifies implementation, esp with TFO. o repeating on first data packet was for reliable delivery, which is now achieved with ACE counter (see next bullet) * Increment the ACE counter if CE on SYN/ACK (but still not if CE on SYN) o Reliable delivery of feedback of CE on SYN/ACK * Redefine 'first packet' as first to arrive, not first in sequence in 2 cases: o Handshake reflection on the ACK of the SYN/ACK o In the test for zeroing of ACE o Reason: greatly simplifies implementation * if ACE could have wrapped more than once, SHOULD assume “safest likely case” not "conservatively assume" it did cycle o Reason: avoid unnecessary hit on performance * More robustness (with flexibility) in rules for when to include an AccECN Option o Change-triggered AccECN Option as SHOULD, not MUST o SHOULD follow change-triggered AccECN Option with another (removes ambiguity if ACK thinning or loss) o when same counter continues to increment, SHOULD consistently include it every n ACKs o Made rule about precedence of SACK conditional (max 2 SACK blocks) o MAY exclude counters that have not changed for the whole connection * Allowed an AccECN server not to implement RFC3168 ECN (all clients still have to) * Precluded mixed capability negotiation from either end o reduces freedom to choose SYN & SYN/ACK fall-back strategies o to prevent cases where each end's outcome after handshake could be inconsistent (in reordering corner-cases) * Reserved the codepoint combination used by the historic nonce case * Merged in a number of points from RFC3168 that we hadn't covered o (a whole new subsection about obligations to do with ECN) * Explicit about checking "acceptable packets" o before counting their ECN markings or before counting the ECN feedback they carry * Required retransmitted Fallback SYN to use same ISN o allows servers to detect ECN downgrade SYN attacks * Handled corner cases like In-window SYN during TIME-WAIT Bob On 06/03/2020 02:24, internet-drafts@ietf.org wrote: > A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt > has been successfully submitted by Bob Briscoe and posted to the > IETF repository. > > Name: draft-ietf-tcpm-accurate-ecn > Revision: 11 > Title: More Accurate ECN Feedback in TCP > Document date: 2020-03-05 > Group: tcpm > Pages: 58 > URL: https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accurate-ecn-11.txt > Status: https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/ > Htmlized: https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11 > Htmlized: https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn > Diff: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-11 > > Abstract: > Explicit Congestion Notification (ECN) is a mechanism where network > nodes can mark IP packets instead of dropping them to indicate > incipient congestion to the end-points. Receivers with an ECN- > capable transport protocol feed back this information to the sender. > ECN is specified for TCP in such a way that only one feedback signal > can be transmitted per Round-Trip Time (RTT). Recent new TCP > mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP) > or Low Latency Low Loss Scalable Throughput (L4S) need more accurate > ECN feedback information whenever more than one marking is received > in one RTT. This document specifies a scheme to provide more than > one feedback signal per RTT in the TCP header. Given TCP header > space is scarce, it allocates a reserved header bit, that was > previously used for the ECN-Nonce which has now been declared > historic. It also overloads the two existing ECN flags in the TCP > header. The resulting extra space is exploited to feed back the IP- > ECN field received during the 3-way handshake as well. Supplementary > feedback information can optionally be provided in a new TCP option, > which is never used on the TCP SYN. > > > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > The IETF Secretariat > > -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ --------------8BF52907CC74FB7A5743D037 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit tcpm,

You will have seen draft-10 then draft-11 in quick succession, as already explained.
The diffs from draft-09 to -10 were those that had built up since Jul'19.
The diffs from draft-10 to -11 were solely those for the change from EXP track to STD track.
Draft-10 doesn't seem to display in the list of links to each version, but you can manually write the URL.

The main technical changes in draft-10 were numerous - many will be recognized from list discussion since Jul'19.
Particular thanks to Ilpo Järvinen who identified many niggles (and their solutions) while writing and testing a full Linux implementation (based on Olivier Tilmans's, in turn based on Mirja's).

  • Allowed 2 different orders of the fields in the AccECN Option
  • Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also on first data packet
    • greatly simplifies implementation, esp with TFO.
    • repeating on first data packet was for reliable delivery, which is now achieved with ACE counter (see next bullet)
  • Increment the ACE counter if CE on SYN/ACK (but still not if CE on SYN)
    • Reliable delivery of feedback of CE on SYN/ACK
  • Redefine 'first packet' as first to arrive, not first in sequence in 2 cases:
    • Handshake reflection on the ACK of the SYN/ACK
    • In the test for zeroing of ACE
    • Reason: greatly simplifies implementation
  • if ACE could have wrapped more than once, SHOULD assume “safest likely case”
    not "conservatively assume" it did cycle
    • Reason: avoid unnecessary hit on performance
  • More robustness (with flexibility) in rules for when to include an AccECN Option
    • Change-triggered AccECN Option as SHOULD, not MUST
    • SHOULD follow change-triggered AccECN Option with another (removes ambiguity if ACK thinning or loss)
    • when same counter continues to increment, SHOULD consistently include it every n ACKs
    • Made rule about precedence of SACK conditional (max 2 SACK blocks)
    • MAY exclude counters that have not changed for the whole connection
  • Allowed an AccECN server not to implement RFC3168 ECN (all clients still have to)
  • Precluded mixed capability negotiation from either end
    • reduces freedom to choose SYN & SYN/ACK fall-back strategies
    • to prevent cases where each end's outcome after handshake could be inconsistent (in reordering corner-cases)
  • Reserved the codepoint combination used by the historic nonce case
  • Merged in a number of points from RFC3168 that we hadn't covered
    • (a whole new subsection about obligations to do with ECN)
  • Explicit about checking "acceptable packets"
    • before counting their ECN markings or before counting the ECN feedback they carry
  • Required retransmitted Fallback SYN to use same ISN
    • allows servers to detect ECN downgrade SYN attacks
  • Handled corner cases like In-window SYN during TIME-WAIT


Bob

On 06/03/2020 02:24, internet-drafts@ietf.org wrote:
A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt
has been successfully submitted by Bob Briscoe and posted to the
IETF repository.

Name:		draft-ietf-tcpm-accurate-ecn
Revision:	11
Title:		More Accurate ECN Feedback in TCP
Document date:	2020-03-05
Group:		tcpm
Pages:		58
URL:            https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accurate-ecn-11.txt
Status:         https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/
Htmlized:       https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11
Htmlized:       https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn
Diff:           https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-11

Abstract:
   Explicit Congestion Notification (ECN) is a mechanism where network
   nodes can mark IP packets instead of dropping them to indicate
   incipient congestion to the end-points.  Receivers with an ECN-
   capable transport protocol feed back this information to the sender.
   ECN is specified for TCP in such a way that only one feedback signal
   can be transmitted per Round-Trip Time (RTT).  Recent new TCP
   mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP)
   or Low Latency Low Loss Scalable Throughput (L4S) need more accurate
   ECN feedback information whenever more than one marking is received
   in one RTT.  This document specifies a scheme to provide more than
   one feedback signal per RTT in the TCP header.  Given TCP header
   space is scarce, it allocates a reserved header bit, that was
   previously used for the ECN-Nonce which has now been declared
   historic.  It also overloads the two existing ECN flags in the TCP
   header.  The resulting extra space is exploited to feed back the IP-
   ECN field received during the 3-way handshake as well.  Supplementary
   feedback information can optionally be provided in a new TCP option,
   which is never used on the TCP SYN.

                                                                                  


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat




-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/
--------------8BF52907CC74FB7A5743D037-- From nobody Fri Mar 6 05:08:46 2020 Return-Path: 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 EA6C33A0F08; Fri, 6 Mar 2020 05:08:39 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.901 X-Spam-Level: X-Spam-Status: No, score=-0.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, CTE_8BIT_MISMATCH=0.999, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no 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 dwIYRnMhVCNc; Fri, 6 Mar 2020 05:08:38 -0800 (PST) Received: from rfc-editor.org (rfc-editor.org [4.31.198.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 77C223A0F07; Fri, 6 Mar 2020 05:08:38 -0800 (PST) Received: by rfc-editor.org (Postfix, from userid 30) id F2F8CF406D9; Fri, 6 Mar 2020 05:08:13 -0800 (PST) To: marco.caspers@t-mobilethuis.nl, david.borman@quantum.com, braden@isi.edu, vanj@google.com, rs@netapp.com X-PHP-Originating-Script: 30:errata_mail_lib.php From: RFC Errata System Cc: ietf@kuehlewind.net, iesg@ietf.org, tcpm@ietf.org, rfc-editor@rfc-editor.org Content-Type: text/plain; charset=UTF-8 Message-Id: <20200306130813.F2F8CF406D9@rfc-editor.org> Date: Fri, 6 Mar 2020 05:08:13 -0800 (PST) Archived-At: Subject: [tcpm] [Errata Rejected] RFC7323 (5586) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2020 13:08:40 -0000 The following errata report has been rejected for RFC7323, "TCP Extensions for High Performance". -------------------------------------- You may review the report below and at: https://www.rfc-editor.org/errata/eid5586 -------------------------------------- Status: Rejected Type: Technical Reported by: Marco Caspers Date Reported: 2018-12-27 Rejected by: Mirja Kühlewind (IESG) Section: 2.3 Original Text ------------- Since the max window is 2^S (where S is the scaling shift count) times at most 2^16 - 1 (the maximum unscaled window), the maximum window is guaranteed to be < 2^30 if S <= 14. Thus, the shift count MUST be limited to 14 (which allows windows of 2^30 = 1 GiB). If a Window Scale option is received with a shift.cnt value larger than 14, the TCP SHOULD log the error but MUST use 14 instead of the specified value. This is safe as a sender can always choose to only partially use any signaled receive window. If the receiver is scaling by a factor larger than 14 and the sender is only scaling by 14, then the receive window used by the sender will appear smaller than it is in reality. Corrected Text -------------- Since the max window is 2^S (where S is the scaling shift count) times at most 2^16 - 1 (the maximum unscaled window), the maximum window is guaranteed to be < 2^30-2^14 if S <= 14. Thus, the shift count MUST be limited to 14 (which allows windows of 2^30-2^14 ~ 1 GiB). If a Window Scale option is received with a shift.cnt value larger than 14, the TCP SHOULD log the error but MUST use 14 instead of the specified value. This is safe as a sender can always choose to only partially use any signaled receive window. If the receiver is scaling by a factor larger than 14 and the sender is only scaling by 14, then the receive window used by the sender will appear smaller than it is in reality. Notes ----- Shifting is inserting zeroes on the right hand side. Thus for S = 14 the 14 right most bits are zero and thus the calculation 2^30 is invalid for the guaranteed maximum window size. Correct calculation formulae is (2^30 - 1) - (2^14 -1). Which can be simplified to 2^30 - 2^14. --VERIFIER NOTES-- That section is for illustration purposes only, and not intended as an exact value for the maximum supported window size. It is correct that the maximum supported window size is 2^30-2^14, but the requirement is, that the window size has to remain smaller than 2^30. -------------------------------------- RFC7323 (draft-ietf-tcpm-1323bis-21) -------------------------------------- Title : TCP Extensions for High Performance Publication Date : September 2014 Author(s) : D. Borman, B. Braden, V. Jacobson, R. Scheffenegger, Ed. Category : PROPOSED STANDARD Source : TCP Maintenance and Minor Extensions Area : Transport Stream : IETF Verifying Party : IESG From nobody Fri Mar 6 06:12:44 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 8B6F83A0776; Fri, 6 Mar 2020 06:12:43 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: tcpm@ietf.org Message-ID: <158350396346.2291.10095781691948621917@ietfa.amsl.com> Date: Fri, 06 Mar 2020 06:12:43 -0800 Archived-At: Subject: [tcpm] I-D Action: draft-ietf-tcpm-converters-18.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2020 14:12:44 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. Title : 0-RTT TCP Convert Protocol Authors : Olivier Bonaventure Mohamed Boucadair Sri Gundavelli SungHoon Seo Benjamin Hesmans Filename : draft-ietf-tcpm-converters-18.txt Pages : 52 Date : 2020-03-06 Abstract: This document specifies an application proxy, called Transport Converter, to assist the deployment of TCP extensions such as Multipath TCP. A Transport Converter may provide conversion service for one or more TCP extensions. The conversion service is provided by means of the TCP Convert Protocol (Convert). This protocol provides 0-RTT (Zero Round-Trip Time) conversion service since no extra delay is induced by the protocol compared to connections that are not proxied. Also, the Convert Protocol does not require any encapsulation (no tunnels, whatsoever). This specification assumes an explicit model, where the Transport Converter is explicitly configured on hosts. As a sample applicability use case, this document specifies how the Convert Protocol applies for Multipath TCP. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tcpm-converters-18 https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-converters-18 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-converters-18 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Fri Mar 6 06:55:37 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 6B9F33A0875; Fri, 6 Mar 2020 06:55:29 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: =?utf-8?q?=C3=89ric_Vyncke_via_Datatracker?= To: "The IESG" Cc: draft-ietf-tcpm-converters@ietf.org, tcpm-chairs@ietf.org, tcpm@ietf.org, Michael Scharf , michael.scharf@hs-esslingen.de X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: =?utf-8?q?=C3=89ric_Vyncke?= Message-ID: <158350652941.2266.18121679478772298127@ietfa.amsl.com> Date: Fri, 06 Mar 2020 06:55:29 -0800 Archived-At: Subject: [tcpm] =?utf-8?q?=C3=89ric_Vyncke=27s_No_Objection_on_draft-ietf?= =?utf-8?q?-tcpm-converters-18=3A_=28with_COMMENT=29?= X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2020 14:55:30 -0000 Éric Vyncke has entered the following ballot position for draft-ietf-tcpm-converters-18: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Med and other authors, Thank you for addressing my previous DISCUSS (kept below for archival purpose), they are now cleared. Most of my COMMENTs were also addressed. BUT, the new version has a couple of typos in the changed text, e.g., 'relam' rather than 'realm'. It also uses 'Unassigned' rather than the usual 'Reserved', is there any reason? Finally, I wonder why the 'magic number' has been introduced and while using the RFC number if 'fun' the entropy is not that high. Anyway, the document can be published in my opinion Thank you for all the work and the fast reaction -éric == OLD DISCUSS == -- Section 1.2 -- A trivial one: while the title and the abstract of this document appear as quite generic, the document focus is reduced later in section 1.2 to MPTCP: "this document specifies how the Convert Protocol applies for Multipath TCP. It is out of scope of this document to provide a comprehensive list of all potential conversion services. " While I do not mind having a focus on MPTCP only, I would strongly suggest to reflect this focus in the title and in the abstract (the current filename is correct). -- Section 6.2.8 -- I appreciate that this is an experimental document, but, having only 2 occurrences of ICMP in the whole document and no real "how to process" TLV "Destination Unreachable"... and the payload of this TLV having only the code without the offending packet will probably make Path MTU discovery (and other mechanisms) impossible. While I am not a transport expert, I believe that this aspect needs to be described in this document. == COMMENTS == -- Section 1.2 -- Is the benefit of a transport proxy only for the clients as written in the 1st paragraph? It was probably the case for the original MPTCP proxy but what about other TCP extensions? -- Section 4.1 -- While the difference "(Internet-facing interface, customer-facing interface)" will probably represent the vast majority of use cases, I wonder whether there will always be a single Internet-facing ? Could probably be 0 or 2 in some use cases... Suggest to remove this part of the text. -- Section 6.1 -- Please state the usual wording about "unassigned" field: it must be ignored by the receiver. Adding some explanations on why version 0 is reserved but cannot be used would be welcome. -- Section 6.2.5 -- Can the "remote peer IP address" be a link-local address ? == NITS == -- Section 1.1 (and possibly others) -- Please use a consistent means of introducing acronyms, cfr URLLC and ATSSS ;-) -- Section 4.2 --- The use of "regular TCP packets" makes me wonder whether the authors think that MPTCP uses "irregular TCP packets"... The use of 'regular' seems a little weird here but I am not a native English speaker. -- Section 4.3 -- The caption below figure 7 ends with "(TCP)" that is not the acronym of "Transport Session Entry". Is it expected ? 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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 BBBBF3A109A; Sat, 7 Mar 2020 03:08:10 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.003 X-Spam-Level: X-Spam-Status: No, score=0.003 tagged_above=-999 required=5 tests=[SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=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 vuUQ2UTtb4-d; Sat, 7 Mar 2020 03:08:06 -0800 (PST) Received: from wp513.webpack.hosteurope.de (wp513.webpack.hosteurope.de [IPv6:2a01:488:42:1000:50ed:8223::]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1B54A3A1098; Sat, 7 Mar 2020 03:08:05 -0800 (PST) Received: from p200300dee7239a00683cee0aa9430cad.dip0.t-ipconnect.de ([2003:de:e723:9a00:683c:ee0a:a943:cad]); authenticated by wp513.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) id 1jAXJD-0005So-Ie; Sat, 07 Mar 2020 12:07:55 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: Mirja Kuehlewind In-Reply-To: <003401d5f3f6$d06f09e0$714d1da0$@t-mobilethuis.nl> Date: Sat, 7 Mar 2020 12:07:54 +0100 Cc: david.borman@quantum.com, braden@isi.edu, vanj@google.com, rs@netapp.com, IESG , "tcpm@ietf.org Extensions" Content-Transfer-Encoding: quoted-printable Message-Id: <21A9989F-5AA2-4D98-934D-94898DD173C1@kuehlewind.net> References: <20200306130813.F2F8CF406D9@rfc-editor.org> <003401d5f3f6$d06f09e0$714d1da0$@t-mobilethuis.nl> To: Marco Caspers X-Mailer: Apple Mail (2.3445.104.11) X-bounce-key: webpack.hosteurope.de;ietf@kuehlewind.net;1583579286;6a3d8b0b; X-HE-SMSGID: 1jAXJD-0005So-Ie Archived-At: Subject: Re: [tcpm] [Errata Rejected] RFC7323 (5586) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 07 Mar 2020 11:08:11 -0000 X-List-Received-Date: Sat, 07 Mar 2020 11:08:11 -0000 Hi Marco, I requested feedback from the authors on this. And as my first sentence = says it=E2=80=99s only meant to be an approximate example in this = section. Errata are meant for things that have been on oversight when the = document was published. The feedback I got from an author was that this = is not the case here. Thanks for filing the errata anyway and for checking! Mirja > On 6. Mar 2020, at 21:35, Marco Caspers = wrote: >=20 > It is correct that the maximum supported window size is = 2^30-2^14, but the requirement is, that the window size has to remain = smaller than 2^30. >=20 > 2^30 -1 is smaller than 2^30, but that is an invalid value. The = requirement is that the window size is smaller than 2^30-2^14. >=20 > -----Oorspronkelijk bericht----- > Van: RFC Errata System =20 > Verzonden: vrijdag 6 maart 2020 14:08 > Aan: marco.caspers@t-mobilethuis.nl; david.borman@quantum.com; = braden@isi.edu; vanj@google.com; rs@netapp.com > CC: ietf@kuehlewind.net; iesg@ietf.org; tcpm@ietf.org; = rfc-editor@rfc-editor.org > Onderwerp: [Errata Rejected] RFC7323 (5586) >=20 > The following errata report has been rejected for RFC7323, "TCP = Extensions for High Performance". >=20 > -------------------------------------- > You may review the report below and at: > https://www.rfc-editor.org/errata/eid5586 >=20 > -------------------------------------- > Status: Rejected > Type: Technical >=20 > Reported by: Marco Caspers Date = Reported: 2018-12-27 Rejected by: Mirja K=C3=BChlewind (IESG) >=20 > Section: 2.3 >=20 > Original Text > ------------- > Since the max window is 2^S (where S is the scaling shift count) > times at most 2^16 - 1 (the maximum unscaled window), the maximum > window is guaranteed to be < 2^30 if S <=3D 14. Thus, the shift = count > MUST be limited to 14 (which allows windows of 2^30 =3D 1 GiB). If = a > Window Scale option is received with a shift.cnt value larger than > 14, the TCP SHOULD log the error but MUST use 14 instead of the > specified value. This is safe as a sender can always choose to only > partially use any signaled receive window. If the receiver is > scaling by a factor larger than 14 and the sender is only scaling by > 14, then the receive window used by the sender will appear smaller > than it is in reality. >=20 >=20 >=20 > Corrected Text > -------------- > Since the max window is 2^S (where S is the scaling shift count) > times at most 2^16 - 1 (the maximum unscaled window), the maximum > window is guaranteed to be < 2^30-2^14 if S <=3D 14. Thus, the = shift count > MUST be limited to 14 (which allows windows of 2^30-2^14 ~ 1 GiB). > If a > Window Scale option is received with a shift.cnt value larger than > 14, the TCP SHOULD log the error but MUST use 14 instead of the > specified value. This is safe as a sender can always choose to only > partially use any signaled receive window. If the receiver is > scaling by a factor larger than 14 and the sender is only scaling by > 14, then the receive window used by the sender will appear smaller > than it is in reality. >=20 >=20 > Notes > ----- > Shifting is inserting zeroes on the right hand side. Thus for S =3D 14 = the 14 right most bits are zero and thus the calculation 2^30 is invalid = for the guaranteed maximum window size. >=20 > Correct calculation formulae is (2^30 - 1) - (2^14 -1). > Which can be simplified to 2^30 - 2^14. > --VERIFIER NOTES-- > That section is for illustration purposes only, and not intended as an = exact value for the maximum supported window size. >=20 > It is correct that the maximum supported window size is 2^30-2^14, but = the requirement is, that the window size has to remain smaller than = 2^30. >=20 > -------------------------------------- > RFC7323 (draft-ietf-tcpm-1323bis-21) > -------------------------------------- > Title : TCP Extensions for High Performance > Publication Date : September 2014 > Author(s) : D. Borman, B. Braden, V. Jacobson, R. = Scheffenegger, Ed. > Category : PROPOSED STANDARD > Source : TCP Maintenance and Minor Extensions > Area : Transport > Stream : IETF > Verifying Party : IESG >=20 >=20 From nobody Mon Mar 9 01:06:20 2020 Return-Path: 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 B46A83A099A for ; Mon, 9 Mar 2020 01:06:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=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 Io9MCKR6JNgf for ; Mon, 9 Mar 2020 01:06:16 -0700 (PDT) Received: from vs21.mail.saunalahti.fi (vs21.mail.saunalahti.fi [193.64.193.197]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EC5AE3A0997 for ; Mon, 9 Mar 2020 01:06:15 -0700 (PDT) Received: from vs21.mail.saunalahti.fi (localhost [127.0.0.1]) by vs21.mail.saunalahti.fi (Postfix) with ESMTP id 073E9203D1 for ; Mon, 9 Mar 2020 10:06:14 +0200 (EET) Received: from gw02.mail.saunalahti.fi (gw02.mail.saunalahti.fi [195.197.172.116]) by vs21.mail.saunalahti.fi (Postfix) with ESMTP id EE408202F3 for ; Mon, 9 Mar 2020 10:06:13 +0200 (EET) Received: from eggert.org (unknown [62.248.255.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: eggert@elisanet.fi) by gw02.mail.saunalahti.fi (Postfix) with ESMTPSA id E5BD740003 for ; Mon, 9 Mar 2020 10:06:12 +0200 (EET) Received: from stickers.eggert.org (stickers.eggert.org [172.24.110.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by eggert.org (Postfix) with ESMTPSA id 87BA0681CCD for ; Mon, 9 Mar 2020 10:06:05 +0200 (EET) From: Lars Eggert Content-Type: multipart/signed; boundary="Apple-Mail=_4B78E8AB-96AF-46DE-840A-9C454F3B132E"; protocol="application/pgp-signature"; micalg=pgp-sha512 Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3608.60.0.2.5\)) Message-Id: <06370C13-5C70-4B5B-8CB5-0D5B120963FB@eggert.org> References: <158348248667.2266.11237911539782413223@ietfa.amsl.com> To: tcpm@ietf.org Date: Mon, 9 Mar 2020 10:06:05 +0200 X-MailScanner-ID: 87BA0681CCD.A548E X-MailScanner: Found to be clean X-MailScanner-From: lars@eggert.org Archived-At: Subject: [tcpm] Fwd: [Lwip] Publication has been requested for draft-ietf-lwig-tcp-constrained-node-networks-09 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 08:06:18 -0000 --Apple-Mail=_4B78E8AB-96AF-46DE-840A-9C454F3B132E Content-Type: multipart/alternative; boundary="Apple-Mail=_A3488034-930D-4C30-95D8-B6363F2F1A5D" --Apple-Mail=_A3488034-930D-4C30-95D8-B6363F2F1A5D Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Probably of interest to this WG. Lars Begin forwarded message: >=20 > From: Zhen Cao via Datatracker > Subject: [Lwip] Publication has been requested for = draft-ietf-lwig-tcp-constrained-node-networks-09 > Date: March 6, 2020 at 10:14:46 GMT+2 > To: > Cc: lwip@ietf.org, iesg-secretary@ietf.org, lwig-chairs@ietf.org >=20 > Zhen Cao has requested publication of = draft-ietf-lwig-tcp-constrained-node-networks-09 as Informational on = behalf of the LWIG working group. >=20 > Please verify the document's state at = https://datatracker.ietf.org/doc/draft-ietf-lwig-tcp-constrained-node-netw= orks/ >=20 >=20 > _______________________________________________ > Lwip mailing list > Lwip@ietf.org > https://www.ietf.org/mailman/listinfo/lwip --Apple-Mail=_A3488034-930D-4C30-95D8-B6363F2F1A5D Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Probably of interest to this WG.

Lars

Begin forwarded message:

From: = Zhen Cao via Datatracker <noreply@ietf.org>
Subject: = [Lwip] = Publication has been requested for = draft-ietf-lwig-tcp-constrained-node-networks-09
Date: = March 6, 2020 at 10:14:46 = GMT+2
To: = <suresh@kaloom.com>
Cc: = lwip@ietf.org, iesg-secretary@ietf.org, lwig-chairs@ietf.org

Zhen Cao has requested = publication of draft-ietf-lwig-tcp-constrained-node-networks-09 as = Informational on behalf of the LWIG working group.

Please verify the document's state at https://datatracker.ietf.org/doc/draft-ietf-lwig-tcp-constraine= d-node-networks/


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([fe80::f977:d5e6:6b09:56ac%10]) with mapi id 14.03.0468.000; Mon, 9 Mar 2020 10:10:41 +0100 From: "Scharf, Michael" To: Michael Tuexen , Yuchung Cheng CC: "draft-ietf-tcpm-rack@ietf.org" , "tcpm IETF list" Thread-Topic: [tcpm] draft-ietf-tcpm-rack - editorial impact of target PS Thread-Index: AdXPEfaA08MAFRCISZS3xRB6hDYy6gBasqCAB+H5gYABe3zmXg== Date: Mon, 9 Mar 2020 09:10:40 +0000 Message-ID: <6EC6417807D9754DA64F3087E2E2E03E2D9C4EE3@rznt8114.rznt.rzdir.fht-esslingen.de> References: <6EC6417807D9754DA64F3087E2E2E03E2D8DBCE1@rznt8114.rznt.rzdir.fht-esslingen.de> , <47402EB9-5B9C-428D-8202-D4925AB5C699@lurchi.franken.de> In-Reply-To: <47402EB9-5B9C-428D-8202-D4925AB5C699@lurchi.franken.de> Accept-Language: de-DE, en-US Content-Language: de-DE X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: multipart/alternative; boundary="_000_6EC6417807D9754DA64F3087E2E2E03E2D9C4EE3rznt8114rzntrzd_" MIME-Version: 1.0 Archived-At: Subject: Re: [tcpm] draft-ietf-tcpm-rack - editorial impact of target PS X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 09:10:46 -0000 --_000_6EC6417807D9754DA64F3087E2E2E03E2D9C4EE3rznt8114rzntrzd_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable These suggestions would work for me. Michael Von: Michael Tuexen Gesendet: Sonntag, 1. M=E4rz 2020 22:04 An: Yuchung Cheng Cc: Scharf, Michael; draft-ietf-tcpm= -rack@ietf.org; tcpm IETF list Betreff: Re: [tcpm] draft-ietf-tcpm-rack - editorial impact of target PS > On 21. Jan 2020, at 19:03, Yuchung Cheng wrote: > > On Sun, Jan 19, 2020 at 1:51 PM Scharf, Michael > wrote: >> >> Hi all, >> >> I briefly scanned through draft-ietf-tcpm-rack-07 regarding the impact o= f the new target as PS. >> >> This e-mail is only about editorial and formal issues. Note that I am no= t the responsible chair for this document. >> >> Questions: >> >> * Metadata: Does the document update other RFCs (such as RFC 5681)? My c= urrent thinking is that the answer is "no", but I want to cross-check. As t= he document now targets PS, it theoretically could update other RFCs. If th= e document does not update other RFCs, maybe it needs to explain this and t= he reason for not doing it somewhere? I don't think that this document updates any other RFC. >> >> * Abstract: "It is intended to replace the conventional DUPACK threshold= approach and its variants, as well as other nonstandard approaches." >> >> I am not sure if the word "replace" could be a formal issue, in particu= lar if other RFCs are not updated by this document (see previous comment). = Another wording that may work around this question could e.g. be "it is int= ended to be an alternative to the conventional DUPACK threshold". Do others= in the working group have any opinion on that wording (in particular nativ= e speakers)? >> >> The same question applies to later use of the word "replace". > I am fine with other wordings except I don't have a better one. What about using: It is intended to supplement the conventional DUPACK threshold approach and= its variants, as well as other nonstandard approaches. > >> >> * Section 4: >> >> "This document provides a concrete and detailed reordering window >> adaptation algorithm for implementers. We note that the specifics of >> the algorithm are likely to evolve over time. But that is a separate >> engineering optimization that's out of scope for this document." >> >> This could be understood as an experiment... Thus, I am not sure if thi= s wording will pass an IETF last call on standards track. I wonder if this = could be reworded to something along the lines of ... > >> >> "This document provides a concrete and detailed reordering window >> adaptation algorithm as a standard solution that is safe to use. >> Implementers have to aware that engineering optimization of >> the algorithm are possible." > how about we just get rid of the paragraph completely since TCP will > evolve no matter what. I agree with removing the paragraph. > >> >> Section 8.4 >> >> "Nevertheless RACK is still an experimental algorithm. Since the >> oldest loss detection algorithm, the 3 duplicate ACK threshold >> [RFC5681], has been standardized and widely deployed. RACK can >> easily and optionally support the conventional approach for >> compatibility." >> >> The first sentence probably should be removed. I don't really understan= d the second sentence. And wouldn't it make sense to better emphasize the "= compatibility" earlier in the document, say, in the intro? > s.g. +1 on removing first sentence Please remove the first sentence. The second one might be reformulated to m= ake clear that the 3 dup ack algorithm is somewhat integrated. >> >> Thanks >> >> Michael (with no hat) Same for me... Best regards Michael > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --_000_6EC6417807D9754DA64F3087E2E2E03E2D9C4EE3rznt8114rzntrzd_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

These suggestions would work for me.

 

Michael

 

 

Von: Michael Tuexen
Gesendet: Sonntag, 1. M=E4rz 2020 22:04
An: Yuchung = Cheng
Cc: Scharf, Michae= l; draft-ietf-tcpm-rack@ietf.org; tcpm IE= TF list
Betreff: Re: [tcpm] draft-ietf-tcpm-rack - editorial impact of targe= t PS

 

> On 21. Jan 2020, at 19:03, Yuchung Cheng <= ycheng=3D40google.com@dmarc.ietf.org> wrote:
>
> On Sun, Jan 19, 2020 at 1:51 PM Scharf, Michael
> <Michael.Scharf@hs-esslingen.de> wrote:
>>
>> Hi all,
>>
>> I briefly scanned through draft-ietf-tcpm-rack-07 regarding the im= pact of the new target as PS.
>>
>> This e-mail is only about editorial and formal issues. Note that I= am not the responsible chair for this document.
>>
>> Questions:
>>
>> * Metadata: Does the document update other RFCs (such as RFC 5681)= ? My current thinking is that the answer is "no", but I want to c= ross-check. As the document now targets PS, it theoretically could update o= ther RFCs. If the document does not update other RFCs, maybe it needs to explain this and the reason for not doing it somew= here?
I don't think that this document updates any other RFC.
>>
>> * Abstract: "It is intended to replace the conventional DUPAC= K threshold approach and its variants, as well as other nonstandard approac= hes."
>>
>>  I am not sure if the word "replace" could be a for= mal issue, in particular if other RFCs are not updated by this document (se= e previous comment). Another wording that may work around this question cou= ld e.g. be "it is intended to be an alternative to the conventional DUPACK threshold". Do others in the working group have a= ny opinion on that wording (in particular native speakers)?
>>
>>  The same question applies to later use of the word "rep= lace".
> I am fine with other wordings except I don't have a better one.
What about using:

It is intended to supplement the conventional DUPACK threshold approach and= its variants,
as well as other nonstandard approaches.
>
>>
>> * Section 4:
>>
>>  "This document provides a concrete and detailed reorder= ing window
>>   adaptation algorithm for implementers.  We note t= hat the specifics of
>>   the algorithm are likely to evolve over time.  Bu= t that is a separate
>>   engineering optimization that's out of scope for this = document."
>>
>>  This could be understood as an experiment... Thus, I am not = sure if this wording will pass an IETF last call on standards track. I wond= er if this could be reworded to something along the lines of ...
>
>>
>>  "This document provides a concrete and detailed reorder= ing window
>>   adaptation algorithm as a standard solution that is sa= fe to use.
>>   Implementers have to aware that engineering optimizati= on of
>>   the algorithm are possible."
> how about we just get rid of the paragraph completely since TCP will > evolve no matter what.
I agree with removing the paragraph.
>
>>
>> Section 8.4
>>
>>  "Nevertheless RACK is still an experimental algorithm.&= nbsp; Since the
>>   oldest loss detection algorithm, the 3 duplicate ACK t= hreshold
>>   [RFC5681], has been standardized and widely deployed.&= nbsp; RACK can
>>   easily and optionally support the conventional approac= h for
>>   compatibility."
>>
>>  The first sentence probably should be removed. I don't reall= y understand the second sentence. And wouldn't it make sense to better emph= asize the "compatibility" earlier in the document, say, in the in= tro?
> s.g. +1 on removing first sentence
Please remove the first sentence. The second one might be reformulated to m= ake clear
that the 3 dup ack algorithm is somewhat integrated.
>>
>> Thanks
>>
>> Michael (with no hat)
Same for me...

Best regards
Michael
>
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org
> https://www.iet= f.org/mailman/listinfo/tcpm

 --_000_6EC6417807D9754DA64F3087E2E2E03E2D9C4EE3rznt8114rzntrzd_-- From nobody Mon Mar 9 02:30:07 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id A02543A0B60 for ; Mon, 9 Mar 2020 02:30:06 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: X-Test-IDTracker: no X-IETF-IDTracker: 6.120.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158374620664.14064.9037883266228871248@ietfa.amsl.com> Date: Mon, 09 Mar 2020 02:30:06 -0700 From: IETF Secretariat Archived-At: Subject: [tcpm] Milestones changed for tcpm WG X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 09:30:07 -0000 Changed milestone "Submit document on a time-based fast loss detection algorithm for TCP to the IESG for publication as a Proposed Standard RFC", set due date to April 2020 from March 2020. Changed milestone "Submit document on Retransmission Timeout Considerations as Best Current Practice RFC", set due date to May 2020 from May 2016. Changed milestone "Submit RFC793bis document to the IESG for publication as Internet Standard", set due date to June 2020 from November 2017. Changed milestone "Submit document on TCP Control Block Interdependence to the IESG for publication as Informational RFC", set due date to July 2020 from November 2019. Changed milestone "Submit specification of more accurate ECN feedback in TCP to the IESG for publication as an Experimental RFC", set due date to August 2020 from August 2016. Changed milestone "Submit document on adding Explicit Congestion Notification (ECN) to TCP Control Packets to the IESG for publication as Experimental RFC", set due date to September 2020 from August 2018. Changed milestone "Submit document on a TCP Extended Data Offset Option to the IESG as a Proposed Standard RFC", set due date to November 2020 from August 2015. URL: https://datatracker.ietf.org/wg/tcpm/about/ From nobody Mon Mar 9 10:13:10 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 132B73A1432; Mon, 9 Mar 2020 10:13:00 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: =?utf-8?q?Mirja_K=C3=BChlewind_via_Datatracker?= To: "The IESG" Cc: tcpm-chairs@ietf.org, tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.120.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: =?utf-8?q?Mirja_K=C3=BChlewind?= Message-ID: <158377398005.5659.9210531184239939226@ietfa.amsl.com> Date: Mon, 09 Mar 2020 10:13:00 -0700 Archived-At: Subject: [tcpm] =?utf-8?q?Mirja_K=C3=BChlewind=27s_Yes_on_charter-ietf-tc?= =?utf-8?q?pm-08-00=3A_=28with_COMMENT=29?= X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 17:13:05 -0000 Mirja Kühlewind has entered the following ballot position for charter-ietf-tcpm-08-00: Yes When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/charter-ietf-tcpm/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- This is a minor change accompany the closure of MPTCP (in the next days). While we all (ADs and chairs) agree that working on minor extensions or fixes for MPTCP is in scope already with the old charter text, this update is intended to also make this explicitly clear to e.g. people from outside the IETF. Therefore I would like to request to approve this small recharter without external review. From nobody Mon Mar 9 10:23:01 2020 Return-Path: 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 5C5C43A13F6 for ; Mon, 9 Mar 2020 10:22:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -17.6 X-Spam-Level: X-Spam-Status: No, score=-17.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com 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 K2AwGy2XAmcG for ; Mon, 9 Mar 2020 10:22:48 -0700 (PDT) Received: from mail-ot1-x332.google.com (mail-ot1-x332.google.com [IPv6:2607:f8b0:4864:20::332]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A83543A1445 for ; Mon, 9 Mar 2020 10:22:48 -0700 (PDT) Received: by mail-ot1-x332.google.com with SMTP id j16so10376720otl.1 for ; Mon, 09 Mar 2020 10:22:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=XvxwXxSzdErThFUHt01hBNd31fli8jYrUsvdGGXnMb4=; b=acPECgAcM6TGdDqh6krMhSkGtpQyd3J7ro7FRmr1EEKLQQ7fe+q6Xx8AAtK5q2iTGP HFyp3tPI+HMnPYk8hRMvhNkxb0v7BSYMCncYMMlXcfNrbpY9zM5CFK/ULz/8F3sXFgYR eqy2v6QrAZ8m6qlDMaZ64BA84liENBbV12s5H68Y2TE5Wms0y+zUsCwxwv7ddS/CPaiT pa5039VSVLXdlOe3BVdBUPJdsoOBUGDymQ5i+pgpe8eGM4GFipYxJHWg7XY2CbyzeR9M EQ1myVExUoZPB7eIP4GFLWs8ijPlYWZoacPHiXgzpD9n/uopiSjW5uonVmrXkHDfmgLt hmcQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=XvxwXxSzdErThFUHt01hBNd31fli8jYrUsvdGGXnMb4=; b=DCExrANwAkhVbheUKZsQE/0ATytko/QJaYMDBHfKWbHCCgvtoUC4rS0nQoxxMGIOsj Hy58UN2FCuANt4PhIfUn1ptTaKfchn74jdOGr6R6u9yV8LZS49hGkg0BQZOghgQoi4u/ gvzkVJ12TXpjeAR7ss7HCE4HVPFsfsZzMaPDzClYMzYJdRQfCJIv5e+rPss4798GfVbf oQELtS6be9w3IgyeZ3hBxFlKCwFa0wT+7vQWdqcITbtiR7PIwC956mphiHukW1mfG9U9 LufFDIFt75XN1NiRIdxLbDe+c4vqeNNWfVFSArXVA6JPYo7RMt4mJ5QWoAJ1sroZu8lg eDIQ== X-Gm-Message-State: ANhLgQ3QPeZLINuRcvQfrT7inV3scaSJSynle6PH6TakGGWvS1ZQgt9f gHmcRdQrJ8h9EsM7lzT66rLU+i94LMgi1mr4wt1sPQ== X-Google-Smtp-Source: ADFU+vsRhmkBlnJjWXOxDDzbIX6ILobXWqVqDm2HOggFf0qUs9DbbqiASluN/uWiSlzAdsbCEnBCIBMn3qw8WWBNVdw= X-Received: by 2002:a05:6830:c5:: with SMTP id x5mr526236oto.302.1583774567190; Mon, 09 Mar 2020 10:22:47 -0700 (PDT) MIME-Version: 1.0 References: <6EC6417807D9754DA64F3087E2E2E03E2D8DBCE1@rznt8114.rznt.rzdir.fht-esslingen.de> <47402EB9-5B9C-428D-8202-D4925AB5C699@lurchi.franken.de> In-Reply-To: <47402EB9-5B9C-428D-8202-D4925AB5C699@lurchi.franken.de> From: Neal Cardwell Date: Mon, 9 Mar 2020 13:22:30 -0400 Message-ID: To: Michael Tuexen Cc: Yuchung Cheng , "Scharf, Michael" , "draft-ietf-tcpm-rack@ietf.org" , tcpm IETF list Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [tcpm] draft-ietf-tcpm-rack - editorial impact of target PS X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 17:22:59 -0000 On Sun, Mar 1, 2020 at 4:04 PM Michael Tuexen wrote: > > > On 21. Jan 2020, at 19:03, Yuchung Cheng wrote: > > > > On Sun, Jan 19, 2020 at 1:51 PM Scharf, Michael > > wrote: ... > >> * Abstract: "It is intended to replace the conventional DUPACK thresho= ld approach and its variants, as well as other nonstandard approaches." > >> > >> I am not sure if the word "replace" could be a formal issue, in parti= cular if other RFCs are not updated by this document (see previous comment)= . Another wording that may work around this question could e.g. be "it is i= ntended to be an alternative to the conventional DUPACK threshold". Do othe= rs in the working group have any opinion on that wording (in particular nat= ive speakers)? > >> > >> The same question applies to later use of the word "replace". > > I am fine with other wordings except I don't have a better one. > What about using: > > It is intended to supplement the conventional DUPACK threshold approach a= nd its variants, > as well as other nonstandard approaches. IMHO "supplement" is not ideal, since the intent is not to have RACK as a supplement to ("on top of" or "in addition to") RFC6675. I do think we intend to mean "instead of", but don't mean to imply everyone must "replace" their RFC6675 with RACK. So I like Michael Scharf's suggestion to use "alternative". So how about replacing: It is intended to replace the conventional DUPACK threshold approach and its variants, as well as other nonstandard approaches. with: It is intended to be an alternative to the DUPACK threshold approach [RFC6675], as well as other nonstandard approaches such as FACK [FACK]. > >> > >> * Section 4: > >> > >> "This document provides a concrete and detailed reordering window > >> adaptation algorithm for implementers. We note that the specifics o= f > >> the algorithm are likely to evolve over time. But that is a separat= e > >> engineering optimization that's out of scope for this document." > >> > >> This could be understood as an experiment... Thus, I am not sure if t= his wording will pass an IETF last call on standards track. I wonder if thi= s could be reworded to something along the lines of ... > > > >> > >> "This document provides a concrete and detailed reordering window > >> adaptation algorithm as a standard solution that is safe to use. > >> Implementers have to aware that engineering optimization of > >> the algorithm are possible." > > how about we just get rid of the paragraph completely since TCP will > > evolve no matter what. > I agree with removing the paragraph. Removing this paragraph sounds good to me as well. > >> Section 8.4 > >> > >> "Nevertheless RACK is still an experimental algorithm. Since the > >> oldest loss detection algorithm, the 3 duplicate ACK threshold > >> [RFC5681], has been standardized and widely deployed. RACK can > >> easily and optionally support the conventional approach for > >> compatibility." > >> > >> The first sentence probably should be removed. I don't really underst= and the second sentence. And wouldn't it make sense to better emphasize the= "compatibility" earlier in the document, say, in the intro? > > s.g. +1 on removing first sentence > Please remove the first sentence. The second one might be reformulated to= make clear > that the 3 dup ack algorithm is somewhat integrated. Sounds good. How about the following version? Since the 3 duplicate ACK threshold for triggering fast recovery [RFC5681= ] has been widely deployed and usually works well in the absence of reordering, RACK uses this signal to trigger fast recovery if a connection has not observed reordering. neal From nobody Mon Mar 9 10:33:56 2020 Return-Path: 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 4C16D3A1188; Mon, 9 Mar 2020 10:33:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.614 X-Spam-Level: X-Spam-Status: No, score=-1.614 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, KHOP_HELO_FCRDNS=0.274, SPF_NONE=0.001, T_SPF_HELO_PERMERROR=0.01, URIBL_BLOCKED=0.001] autolearn=no 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 tSxW7YLmJMme; Mon, 9 Mar 2020 10:33:52 -0700 (PDT) Received: from drew.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 779CC3A1182; Mon, 9 Mar 2020 10:33:51 -0700 (PDT) Received: from [IPv6:2a02:8109:1140:c3d:fcad:c4b5:d3f7:931] (unknown [IPv6:2a02:8109:1140:c3d:fcad:c4b5:d3f7:931]) (Authenticated sender: lurchi) by drew.franken.de (Postfix) with ESMTPSA id 7376472106C26; Mon, 9 Mar 2020 18:33:47 +0100 (CET) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3608.60.0.2.5\)) From: Michael Tuexen In-Reply-To: Date: Mon, 9 Mar 2020 18:33:46 +0100 Cc: Yuchung Cheng , "Scharf, Michael" , "draft-ietf-tcpm-rack@ietf.org" , tcpm IETF list Content-Transfer-Encoding: quoted-printable Message-Id: <20103FBF-34AC-4DDB-953F-38F6B81E7EED@lurchi.franken.de> References: <6EC6417807D9754DA64F3087E2E2E03E2D8DBCE1@rznt8114.rznt.rzdir.fht-esslingen.de> <47402EB9-5B9C-428D-8202-D4925AB5C699@lurchi.franken.de> To: Neal Cardwell X-Mailer: Apple Mail (2.3608.60.0.2.5) Archived-At: Subject: Re: [tcpm] draft-ietf-tcpm-rack - editorial impact of target PS X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 17:33:54 -0000 > On 9. Mar 2020, at 18:22, Neal Cardwell wrote: >=20 > On Sun, Mar 1, 2020 at 4:04 PM Michael Tuexen > wrote: >>=20 >>> On 21. Jan 2020, at 19:03, Yuchung Cheng = wrote: >>>=20 >>> On Sun, Jan 19, 2020 at 1:51 PM Scharf, Michael >>> wrote: > ... >>>> * Abstract: "It is intended to replace the conventional DUPACK = threshold approach and its variants, as well as other nonstandard = approaches." >>>>=20 >>>> I am not sure if the word "replace" could be a formal issue, in = particular if other RFCs are not updated by this document (see previous = comment). Another wording that may work around this question could e.g. = be "it is intended to be an alternative to the conventional DUPACK = threshold". Do others in the working group have any opinion on that = wording (in particular native speakers)? >>>>=20 >>>> The same question applies to later use of the word "replace". >>> I am fine with other wordings except I don't have a better one. >> What about using: >>=20 >> It is intended to supplement the conventional DUPACK threshold = approach and its variants, >> as well as other nonstandard approaches. >=20 > IMHO "supplement" is not ideal, since the intent is not to have RACK > as a supplement to ("on top of" or "in addition to") RFC6675. I do > think we intend to mean "instead of", but don't mean to imply everyone > must "replace" their RFC6675 with RACK. So I like Michael Scharf's > suggestion to use "alternative". >=20 > So how about replacing: >=20 > It is intended to replace the conventional DUPACK threshold approach > and its variants, as well as other nonstandard approaches. >=20 > with: >=20 > It is intended to be an alternative to the DUPACK threshold > approach [RFC6675], > as well as other nonstandard approaches such as FACK [FACK]. OK. >=20 >>>>=20 >>>> * Section 4: >>>>=20 >>>> "This document provides a concrete and detailed reordering window >>>> adaptation algorithm for implementers. We note that the specifics = of >>>> the algorithm are likely to evolve over time. But that is a = separate >>>> engineering optimization that's out of scope for this document." >>>>=20 >>>> This could be understood as an experiment... Thus, I am not sure if = this wording will pass an IETF last call on standards track. I wonder if = this could be reworded to something along the lines of ... >>>=20 >>>>=20 >>>> "This document provides a concrete and detailed reordering window >>>> adaptation algorithm as a standard solution that is safe to use. >>>> Implementers have to aware that engineering optimization of >>>> the algorithm are possible." >>> how about we just get rid of the paragraph completely since TCP will >>> evolve no matter what. >> I agree with removing the paragraph. >=20 > Removing this paragraph sounds good to me as well. Great. >=20 >>>> Section 8.4 >>>>=20 >>>> "Nevertheless RACK is still an experimental algorithm. Since the >>>> oldest loss detection algorithm, the 3 duplicate ACK threshold >>>> [RFC5681], has been standardized and widely deployed. RACK can >>>> easily and optionally support the conventional approach for >>>> compatibility." >>>>=20 >>>> The first sentence probably should be removed. I don't really = understand the second sentence. And wouldn't it make sense to better = emphasize the "compatibility" earlier in the document, say, in the = intro? >>> s.g. +1 on removing first sentence >> Please remove the first sentence. The second one might be = reformulated to make clear >> that the 3 dup ack algorithm is somewhat integrated. >=20 > Sounds good. How about the following version? >=20 > Since the 3 duplicate ACK threshold for triggering fast recovery = [RFC5681] > has been widely deployed and usually works well in the absence of > reordering, RACK uses this signal to trigger fast recovery if a > connection has not observed reordering. Sounds good to me. Best regards Michael >=20 > neal From nobody Mon Mar 9 11:30:53 2020 Return-Path: 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 398CD3A14F2; Mon, 9 Mar 2020 11:30:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.111 X-Spam-Level: X-Spam-Status: No, score=-3.111 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_MSPIKE_H2=-1.463, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=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 G3ARGxnpcoLU; Mon, 9 Mar 2020 11:30:39 -0700 (PDT) Received: from mail-il1-f181.google.com (mail-il1-f181.google.com [209.85.166.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E0F603A14ED; Mon, 9 Mar 2020 11:30:38 -0700 (PDT) Received: by mail-il1-f181.google.com with SMTP id x2so9597133ila.9; Mon, 09 Mar 2020 11:30:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=dSS1z0OusoeXzAsQTwAuQi55UHltfv0UMRGoz+rL/eU=; b=HwVQi65YRHp2tbZdFMd6sD6oRerTz+Oscz/1eOhu2nyOLXQXVXFXypF986RygbyIig f0SQ23JmdKMnEGcz28oW888UkbC4g/djSjuxntUw/+tstjV2qRVB0fh39PZH/TY41VQp uhO5elpwUqYD8M31ZrsvJR8F2YOXoK8n3LLwJiPmla/Z4GR/azbCSpEN4YZ2Irna8r6K naOQ8poVGxHFevhO+ufQBNDEKuHOYHUycHt5txeV6eJIesXM0scyUgIdnVsdSootW8UB atAtrgzeHOPKV+xYutCxFGcOx1VPM4XndH1tQ83ruN/CTrQQmc5D1vQsQjwrHowkSHc5 G4xw== X-Gm-Message-State: ANhLgQ2kKazGpPJ7d72nI0/Mc+wSQsykbNuNzDFZ0tWXQ0fS0nBgn37Z 4bdyeOI6G0F07udVu3+vNMIHnea4L23R7W9dJyt6gg== X-Google-Smtp-Source: ADFU+vtS5KvtKORpI9CtGOnrEIzXcB5sWCPZxBc7XiinhdzqKMV8lwCHpItIbhNES/z7Ox5bdw/9H381KQkxgTn3fdM= X-Received: by 2002:a92:7e16:: with SMTP id z22mr17168081ilc.266.1583778637959; Mon, 09 Mar 2020 11:30:37 -0700 (PDT) MIME-Version: 1.0 References: <158377398005.5659.9210531184239939226@ietfa.amsl.com> In-Reply-To: <158377398005.5659.9210531184239939226@ietfa.amsl.com> From: Barry Leiba Date: Mon, 9 Mar 2020 14:30:26 -0400 Message-ID: To: =?UTF-8?Q?Mirja_K=C3=BChlewind?= Cc: The IESG , tcpm@ietf.org, tcpm-chairs@ietf.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [tcpm] =?utf-8?q?Mirja_K=C3=BChlewind=27s_Yes_on_charter-ietf-tc?= =?utf-8?q?pm-08-00=3A_=28with_COMMENT=29?= X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 18:30:45 -0000 Indeed; the change is exactly adding one bullet about MPTCP, and changing "alternate transports" to "other IETF transports". If this isn't the epitome of "approve without external review", then I don't know what is. I'm off to ballot "Yes" now. Barry On Mon, Mar 9, 2020 at 1:13 PM Mirja K=C3=BChlewind via Datatracker wrote: > > Mirja K=C3=BChlewind has entered the following ballot position for > charter-ietf-tcpm-08-00: Yes > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/charter-ietf-tcpm/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > This is a minor change accompany the closure of MPTCP (in the next days).= While > we all (ADs and chairs) agree that working on minor extensions or fixes f= or > MPTCP is in scope already with the old charter text, this update is inten= ded to > also make this explicitly clear to e.g. people from outside the IETF. The= refore > I would like to request to approve this small recharter without external = review. > > > From nobody Mon Mar 9 13:00:42 2020 Return-Path: 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 183353A168F for ; Mon, 9 Mar 2020 13:00:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 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, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=hs-esslingen.de 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 j4SZboQt4CHC for ; Mon, 9 Mar 2020 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([2601:647:5600:5020:dd64:719b:85dd:915c]) by smtp.gmail.com with ESMTPSA id a9sm44993584pfo.35.2020.03.09.13.38.00 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 09 Mar 2020 13:38:00 -0700 (PDT) From: Mahesh Jethanandani Content-Type: multipart/alternative; boundary="Apple-Mail=_E28EBA0E-0A64-4936-98C8-FB3C0DED18EB" Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) Date: Mon, 9 Mar 2020 13:37:58 -0700 References: <158257419981.24230.18314968120046266930.idtracker@ietfa.amsl.com> Cc: draft-scharf-tcpm-yang-tcp@ietf.org To: tcpm@ietf.org Message-Id: <091F252F-938F-4F90-83F3-48727ABFE7BD@gmail.com> X-Mailer: Apple Mail (2.3445.9.1) Archived-At: Subject: [tcpm] Fwd: New Version Notification for draft-scharf-tcpm-yang-tcp-04.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 20:38:04 -0000 --Apple-Mail=_E28EBA0E-0A64-4936-98C8-FB3C0DED18EB Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii This update of the draft added text to address the issues we discussed = in IETF 106. In particular it adds: a container to keep track of all TCP connections statistics and ability to clear them (if support for it is indicated = using the feature statement) support for securing the connection using TCP-AO or MD5 congestion control algorithms ECN Please review and provide comments. We, the authors believe that the draft is ready for WG adoption at this = time. Thanks. > Begin forwarded message: >=20 > From: internet-drafts@ietf.org > Subject: New Version Notification for = draft-scharf-tcpm-yang-tcp-04.txt > Date: February 24, 2020 at 11:56:39 AM PST > To: "Michael Scharf" , "Mahesh = Jethanandani" , "Vishal Murgai" = >=20 >=20 > A new version of I-D, draft-scharf-tcpm-yang-tcp-04.txt > has been successfully submitted by Mahesh Jethanandani and posted to = the > IETF repository. >=20 > Name: draft-scharf-tcpm-yang-tcp > Revision: 04 > Title: YANG Model for Transmission Control Protocol = (TCP) Configuration > Document date: 2020-02-24 > Group: Individual Submission > Pages: 21 > URL: = https://www.ietf.org/internet-drafts/draft-scharf-tcpm-yang-tcp-04.txt > Status: = https://datatracker.ietf.org/doc/draft-scharf-tcpm-yang-tcp/ > Htmlized: = https://tools.ietf.org/html/draft-scharf-tcpm-yang-tcp-04 > Htmlized: = https://datatracker.ietf.org/doc/html/draft-scharf-tcpm-yang-tcp > Diff: = https://www.ietf.org/rfcdiff?url2=3Ddraft-scharf-tcpm-yang-tcp-04 >=20 > Abstract: > This document specifies a YANG model for TCP on devices that are > configured by network management protocols. The YANG model defines = a > container for all TCP connections and groupings of fundamental > parameters that can be imported and used in many TCP = implementations. > The model includes definitions from YANG Groupings for TCP Client = and > TCP Servers (I-D.ietf-netconf-tcp-client-server). The model is NMDA > (RFC 8342) compliant. >=20 >=20 >=20 >=20 > Please note that it may take a couple of minutes from the time of = submission > until the htmlized version and diff are available at tools.ietf.org. >=20 > The IETF Secretariat >=20 >=20 Mahesh Jethanandani mjethanandani@gmail.com --Apple-Mail=_E28EBA0E-0A64-4936-98C8-FB3C0DED18EB Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii This = update of the draft added text to address the issues we discussed in = IETF 106. In particular it adds:
  • a container to keep track of all = TCP connections
  • statistics and ability to clear them = (if support for it is indicated using the feature statement)
  • support for securing the connection using TCP-AO or = MD5
  • congestion control algorithms
  • ECN

Please review and provide comments.

We, the authors believe that the draft = is ready for WG adoption at this time.

Thanks.

Begin = forwarded message:

From: = internet-drafts@ietf.org
Subject: = New Version = Notification for draft-scharf-tcpm-yang-tcp-04.txt
Date: = February 24, 2020 at 11:56:39 = AM PST
To: = "Michael Scharf" <michael.scharf@hs-esslingen.de>, "Mahesh Jethanandani" = <mjethanandani@gmail.com>, "Vishal Murgai" <vmurgai@cisco.com>

A new version of I-D, draft-scharf-tcpm-yang-tcp-04.txt
has been successfully submitted by Mahesh Jethanandani and = posted to the
IETF repository.

Name: = = draft-scharf-tcpm-yang-tcp
Revision: 04
Title:= = YANG Model for Transmission Control Protocol (TCP) = Configuration
Document date: 2020-02-24
Group:= = Individual Submission
Pages: 21
URL: =            https://www.ietf.org/internet-drafts/draft-scharf-tcpm-yang-tcp= -04.txt
Status: =         https://datatracker.ietf.org/doc/draft-scharf-tcpm-yang-tcp/
Htmlized:       https://tools.ietf.org/html/draft-scharf-tcpm-yang-tcp-04Htmlized:       https://datatracker.ietf.org/doc/html/draft-scharf-tcpm-yang-tc= p
Diff: =           https://www.ietf.org/rfcdiff?url2=3Ddraft-scharf-tcpm-yang-tcp-= 04

Abstract:
=   This document specifies a YANG model for TCP on devices that = are
  configured by network management = protocols.  The YANG model defines a
=   container for all TCP connections and groupings of = fundamental
  parameters that can be imported = and used in many TCP implementations.
  The = model includes definitions from YANG Groupings for TCP Client and
  TCP Servers = (I-D.ietf-netconf-tcp-client-server).  The model is NMDA
  (RFC 8342) compliant.




Please note that = it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat





Mahesh Jethanandani



= --Apple-Mail=_E28EBA0E-0A64-4936-98C8-FB3C0DED18EB-- From nobody Mon Mar 9 15:32:12 2020 Return-Path: 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 5F39B3A086E for ; Mon, 9 Mar 2020 15:32:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cs.helsinki.fi 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 SU1UtY29Lc_b for ; Mon, 9 Mar 2020 15:32:00 -0700 (PDT) Received: from script.cs.helsinki.fi (script.cs.helsinki.fi [128.214.11.1]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3361D3A083C for ; Mon, 9 Mar 2020 15:31:59 -0700 (PDT) X-DKIM: Courier DKIM Filter v0.50+pk-2017-10-25 mail.cs.helsinki.fi Tue, 10 Mar 2020 00:31:50 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.helsinki.fi; h=date:from:to:cc:subject:in-reply-to:message-id:references :mime-version:content-type:content-id; s=dkim20130528; bh=QjOMfm C1kyCjb5hMKH5+KTUOB8n85EK25zS5PFppNps=; b=SckxUg2bEedZoYf6vP0J8l Z0qlkGr6tMDaLaA8xPWd31heKt71lXhAiDwKv2+8jbX81ZKsbRugP76OU/RfaFsg Z8B9VCvbcz5/ZaJw8zQjfTXuyPbZfJmkxYSdcckjLtAXtxYre5DM/3lrUZ0oqoY5 GWP8UYjj4XoePecHnSp40= Received: from whs-18.cs.helsinki.fi (whs-18.cs.helsinki.fi [128.214.166.46]) (TLS: TLSv1/SSLv3,256bits,AES256-GCM-SHA384) by mail.cs.helsinki.fi with ESMTPS; Tue, 10 Mar 2020 00:31:50 +0200 id 00000000005A1C82.000000005E66C3D6.00004CB9 Date: Tue, 10 Mar 2020 00:31:50 +0200 (EET) From: "=?ISO-8859-15?Q?Ilpo_J=E4rvinen?=" X-X-Sender: ijjarvin@whs-18.cs.helsinki.fi To: Michael Scharf cc: Bob Briscoe , tcpm IETF list , Richard Scheffenegger , Mirja Kuehlewind In-Reply-To: <6EC6417807D9754DA64F3087E2E2E03E2D9CA5C4@rznt8114.rznt.rzdir.fht-esslingen.de> Message-ID: References: <6EC6417807D9754DA64F3087E2E2E03E2D9CA5C4@rznt8114.rznt.rzdir.fht-esslingen.de> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=_script-19665-1583793110-0001-2" Content-ID: Archived-At: Subject: Re: [tcpm] New Version Notification fordraft-ietf-tcpm-accurate-ecn-11.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 22:32:10 -0000 This is a MIME-formatted message. If you see this text it means that your E-mail software does not support MIME-formatted messages. --=_script-19665-1583793110-0001-2 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-ID: Hi Michael, I agree with out that it's somewhat painful to deal with the marker bit=20 at the beginning for the option field order. Another challenge I've come across is to correctly reproduce the Accurate ECN state at the sender which would benefit from having a few extra bits available. It currently requires guessing at every option arrival what the receiver=20 is doing next (what counter it will be increasing next) which is not very=20 robust to ACK losses. On change-triggered ACK, two byte counters are=20 increasing rather than one. ACK losses will easily confuse approach that=20 just assumes back-and-forth transitions. Thus, I suggested sending one=20 extra option after the change-triggered ACK to allow sender to see=20 unambiguous counter delta between the change-triggered ACK and that next ACK (it is now in -11). To allow the sender to immediately sync with the receiver on any AccECN option arrival, it would make sense to encode that information into the option itself. It would need 2 extra bits into the option so adding that one byte there would help. ...It might be possible to combine it to field order and define that the first encoded field is the currently increasing counter (the order of the remaining two fields=20 still need to be addressed somehow). --=20 i. On Mon, 9 Mar 2020, Michael Scharf wrote: >=20 > With chair hat off, I really wonder if the solution to encode the two > different orders in the TCP Option is an example for good and robust > protocol engineering. >=20 > =C2=A0 >=20 > For instance, the current design makes it hard to decode the field in a > monitoring tool (such as Wireshark). Also, as far as I understand, it d= oes > not allow to switch the encoding during a connection, which limits > flexibility. We almost certainly do not understand *now* all future use > cases of this Standard. >=20 > =C2=A0 >=20 > Unless I miss something, there would be several other solutions: >=20 > =C2=A0 >=20 > First, IMHO, we have enough TCP option codepoints left to spend two > codepoints if there is a good reason for doing so. As compared to the > current design proposal in -10/-11, spending two different option kinds > would look to me like *much* better protocol engineering. >=20 > =C2=A0 >=20 > Second, if the TCPM community insists in only one option kind codepoint = for > whatever reason, IMHO one could add one =E2=80=9Esub-type=E2=80=9C byte = to the option. The > TCP Option field has to be multiples of 4 byte, i.e., if a segment only > contains a 11 byte AccECN TCP option, an additional NOP TCP option is n= eeded > for padding, no? So, what downside have 12 bytes as compared to 11 byte= s? > For the shorter variants, the overhead of a =E2=80=9Esub-type=E2=80=9C = field increases, but > it may still be within reasonable limits. What do I miss? >=20 > =C2=A0 >=20 > Third, one could use different lengths for the different orders, e.g., > lenths 5/8/11 for type 0 and 6/9/12 for type 12. Is this not possible? >=20 > =C2=A0 >=20 > In all these cases, the resulting protocol looks simpler and more robus= t to > me. What prevents us from using the KISS principle? >=20 > =C2=A0 >=20 > Michael >=20 > =C2=A0 >=20 > =C2=A0 >=20 > =C2=A0 >=20 > Von: Bob Briscoe > Gesendet: Freitag, 6. M=C3=A4rz 2020 04:34 > An: tcpm IETF list > Cc: Richard Scheffenegger; Mirja Kuehlewind > Betreff: Re: [tcpm] New Version Notification for > draft-ietf-tcpm-accurate-ecn-11.txt >=20 > =C2=A0 >=20 > tcpm, >=20 > You will have seen draft-10 then draft-11 in quick succession, as alrea= dy > explained. > The diffs from draft-09 to -10 were those that had built up since Jul'1= 9. > The diffs from draft-10 to -11 were solely those for the change from EX= P > track to STD track. > Draft-10 doesn't seem to display in the list of links to each version, = but > you can manually write the URL. >=20 > The main technical changes in draft-10 were numerous - many will be > recognized from list discussion since Jul'19. > Particular thanks to Ilpo J=C3=A4rvinen who identified many niggles (an= d their > solutions) while writing and testing a full Linux implementation (based = on > Olivier Tilmans's, in turn based on Mirja's). >=20 > * Allowed 2 different orders of the fields in the AccECN Option > * Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also on > first data packet > + greatly simplifies implementation, esp with TFO. > + repeating on first data packet was for reliable delivery, which = is > now achieved with ACE counter (see next bullet) > * Increment the ACE counter if CE on SYN/ACK (but still not if CE on = SYN) > + Reliable delivery of feedback of CE on SYN/ACK > * Redefine 'first packet' as first to arrive, not first in sequence i= n 2 > cases: > + Handshake reflection on the ACK of the SYN/ACK > + In the test for zeroing of ACE > + Reason: greatly simplifies implementation > * if ACE could have wrapped more than once, SHOULD assume =E2=80=9Csa= fest likely > case=E2=80=9D > not "conservatively assume" it did cycle > + Reason: avoid unnecessary hit on performance > * More robustness (with flexibility) in rules for when to include an > AccECN Option > + Change-triggered AccECN Option as SHOULD, not MUST > + SHOULD follow change-triggered AccECN Option with another (remo= ves > ambiguity if ACK thinning or loss) > + when same counter continues to increment, SHOULD consistently > include it every n ACKs > + Made rule about precedence of SACK conditional (max 2 SACK bloc= ks) > + MAY exclude counters that have not changed for the whole connec= tion > * Allowed an AccECN server not to implement RFC3168 ECN (all clients = still > have to) > * Precluded mixed capability negotiation from either end > + reduces freedom to choose SYN & SYN/ACK fall-back strategies > + to prevent cases where each end's outcome after handshake could = be > inconsistent (in reordering corner-cases) > * Reserved the codepoint combination used by the historic nonce case > * Merged in a number of points from RFC3168 that we hadn't covered > + (a whole new subsection about obligations to do with ECN) > * Explicit about checking "acceptable packets" > + before counting their ECN markings or before counting the ECN > feedback they carry > * Required retransmitted Fallback SYN to use same ISN > + allows servers to detect ECN downgrade SYN attacks > * Handled corner cases like In-window SYN during TIME-WAIT >=20 >=20 >=20 > Bob >=20 > On 06/03/2020 02:24, internet-drafts@ietf.org wrote: >=20 > =C2=A0 >=20 > A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt >=20 > has been successfully submitted by Bob Briscoe and posted to the >=20 > IETF repository. >=20 > =C2=A0 >=20 > Name:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 = draft-ietf-tcpm-accurate-ecn >=20 > Revision: 11 >=20 > Title:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 More = Accurate ECN Feedback in TCP >=20 > Document date:=C2=A0=C2=A0 2020-03-05 >=20 > Group:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tcpm >=20 > Pages:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 58 >=20 > URL:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 = https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accurat > e-ecn-11.txt >=20 > Status:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 https://datatra= cker.ietf.org/doc/draft-ietf-tcpm-accurate-ec > n/ >=20 > Htmlized:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 https://tools.ietf.org/ht= ml/draft-ietf-tcpm-accurate-ecn-11 >=20 > Htmlized:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 https://datatracker.ietf.= org/doc/html/draft-ietf-tcpm-accura > te-ecn >=20 > Diff:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 https= ://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-accurate-e > cn-11 >=20 > =C2=A0 >=20 > Abstract: >=20 > =C2=A0=C2=A0 Explicit Congestion Notification (ECN) is a mechanism wher= e network >=20 > =C2=A0=C2=A0 nodes can mark IP packets instead of dropping them to indi= cate >=20 > =C2=A0=C2=A0 incipient congestion to the end-points.=C2=A0 Receivers wi= th an ECN- >=20 > =C2=A0=C2=A0 capable transport protocol feed back this information to t= he sender. >=20 > =C2=A0=C2=A0 ECN is specified for TCP in such a way that only one feedb= ack signal >=20 > =C2=A0=C2=A0 can be transmitted per Round-Trip Time (RTT).=C2=A0 Recent = new TCP >=20 > =C2=A0=C2=A0 mechanisms like Congestion Exposure (ConEx), Data Center T= CP (DCTCP) >=20 > =C2=A0=C2=A0 or Low Latency Low Loss Scalable Throughput (L4S) need mor= e accurate >=20 > =C2=A0=C2=A0 ECN feedback information whenever more than one marking is = received >=20 > =C2=A0=C2=A0 in one RTT.=C2=A0 This document specifies a scheme to prov= ide more than >=20 > =C2=A0=C2=A0 one feedback signal per RTT in the TCP header.=C2=A0 Given = TCP header >=20 > =C2=A0=C2=A0 space is scarce, it allocates a reserved header bit, that = was >=20 > =C2=A0=C2=A0 previously used for the ECN-Nonce which has now been decla= red >=20 > =C2=A0=C2=A0 historic.=C2=A0 It also overloads the two existing ECN fla= gs in the TCP >=20 > =C2=A0=C2=A0 header.=C2=A0 The resulting extra space is exploited to fe= ed back the IP- >=20 > =C2=A0=C2=A0 ECN field received during the 3-way handshake as well.=C2=A0 = Supplementary >=20 > =C2=A0=C2=A0 feedback information can optionally be provided in a new T= CP option, >=20 > =C2=A0=C2=A0 which is never used on the TCP SYN. >=20 > =C2=A0 >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 >=20 > =C2=A0 >=20 > =C2=A0 >=20 > Please note that it may take a couple of minutes from the time of submi= ssion >=20 > until the htmlized version and diff are available at tools.ietf.org. >=20 > =C2=A0 >=20 > The IETF Secretariat >=20 > =C2=A0 >=20 > =C2=A0 >=20 >=20 >=20 > --=_script-19665-1583793110-0001-2-- From nobody Mon Mar 9 15:44:43 2020 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B07333A0898; Mon, 9 Mar 2020 15:44:30 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.120.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: tcpm@ietf.org Message-ID: <158379387063.5554.16182471354393243531@ietfa.amsl.com> Date: Mon, 09 Mar 2020 15:44:30 -0700 Archived-At: Subject: [tcpm] I-D Action: draft-ietf-tcpm-rack-08.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 22:44:38 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. Title : RACK: a time-based fast loss detection algorithm for TCP Authors : Yuchung Cheng Neal Cardwell Nandita Dukkipati Priyaranjan Jha Filename : draft-ietf-tcpm-rack-08.txt Pages : 30 Date : 2020-03-09 Abstract: This document presents a new TCP loss detection algorithm called RACK ("Recent ACKnowledgment"). RACK uses the notion of time, instead of packet or sequence counts, to detect losses, for modern TCP implementations that can support per-packet timestamps and the selective acknowledgment (SACK) option. It is intended to be an alternative to the DUPACK threshold approach [RFC6675], as well as other nonstandard approaches such as FACK [FACK]. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tcpm-rack/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tcpm-rack-08 https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rack-08 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rack-08 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Mar 9 15:53:41 2020 Return-Path: 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 22BE33A0867 for ; Mon, 9 Mar 2020 15:53:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -17.599 X-Spam-Level: X-Spam-Status: No, score=-17.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com 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 HifTSGabTQHk for ; Mon, 9 Mar 2020 15:53:30 -0700 (PDT) Received: from mail-vs1-xe36.google.com (mail-vs1-xe36.google.com [IPv6:2607:f8b0:4864:20::e36]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 10F0B3A08CA for ; Mon, 9 Mar 2020 15:53:29 -0700 (PDT) Received: by mail-vs1-xe36.google.com with SMTP id k188so7197062vsc.8 for ; Mon, 09 Mar 2020 15:53:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=EcR1KHqNQw+LtLTd0zRIZlITP/Qqvi0Y7tF9GIQTf2M=; b=X42U8JA8RO3frVBexT5xgx+fVPiXLnHabgrDFTi4xcQZ5o+BxcOBJxCGJqaseaaCHl EdaMRm7XcnV0yJNd61+RIciItPwWy1jeZpE1UW4xbCXi30y5v2bwNnT2SSSRIa4OfZb7 LoMUPgCpipYPE1VhkuPcuITJ46OvKshi/IMabXQpBEYREzOimv5FkSF4tcCAi6NTWof7 kuzbbE6Ok3eNFfNidhRoOfLG2aDZkmmZjpVVv3Y3KL+hGXJP0e7TaWZdDUwmggwtVwYp YPe9wBpVEILMhzXOxopgwaLsc/rJulCpEdx3ivVkiTdpaUExSugnQ6AH0wNY/9cdgvP4 Yf9A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=EcR1KHqNQw+LtLTd0zRIZlITP/Qqvi0Y7tF9GIQTf2M=; b=CeauxIs4dBWDN96pSeqm/dZaAVbSyu/17IBJvO6Cuq+UbJuLCVVF9lHXYrz82HGbjq D+N6pJgHbzZrKhnyKNs8fVNjGalzKyVXLsRtGHzH3CK/8OOG7iBnBriJhGlIqqmoxlCv f1dctJZi6CfxH2O1+dHwZitS7CjfJv23x0eGLGHUdcQaPRWHl/2IwwpXvooO7BM+uqJV 2mhL1ihUw74ilx9LJ1BCkUMoKUHDdA1lQmONf/Kxf0erg6flf5GSHc/Vp8SK6Lv44FsI NByu1PytoaZSLCxOudMEuIFtfDTZVOrUEGU6YxcskMJzhFPqp5kk2qP2svc+qTv5rWys EXQg== X-Gm-Message-State: ANhLgQ2vkjlnvQKtTIGHDgbqOdz0H8tGht3DZQxkqovdyuLmk6MVPTs9 c4/v/KsQOkM8erL0l6Tw45W4jKaWTFlVstfS+0npyw== X-Google-Smtp-Source: ADFU+vs7Gcf/cCnRCQW7KYtFsQrcc2rZvbHB0eFHh21TpL9JCAQ43rIFydzYgZYnsim2CpIFPKDywF9L/SP1158hI7A= X-Received: by 2002:a67:6e83:: with SMTP id j125mr10991795vsc.123.1583794408582; Mon, 09 Mar 2020 15:53:28 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Yuchung Cheng Date: Mon, 9 Mar 2020 15:52:51 -0700 Message-ID: To: =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= Cc: "tcpm@ietf.org Extensions" , Neal Cardwell , Nandita Dukkipati , Priyaranjan Jha Content-Type: multipart/alternative; boundary="0000000000001f5aa705a073df45" Archived-At: Subject: Re: [tcpm] Review of draft-ietf-tcpm-rack-07 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2020 22:53:34 -0000 --0000000000001f5aa705a073df45 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Ilpo, Thanks for a detailed review and the great suggestions. Here's all the edits we made. https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-rack-08 We defined the missing terms and addressed the nits, removed the less critical parts like recommending PRR, and edited TLP algorithms (sections 7.4 to 7.6). I hope you find it's better now and would be happy to hear any improvements you'd like to make. Yuchung On Fri, Feb 14, 2020 at 4:22 AM Ilpo J=C3=A4rvinen wrote: > In general, I find the draft quite good shape already, it's quite easy > to read and follow (that is, except the TLP sections that are specificall= y > mentioned below). > > Here's the list of issues I came across: > > Sect 6.1 > > "RACK.pkts_sacked" lacks the empty line separator. > > Sect 7.2 > > "This > heuristic would fail to update RACK stats if the packet is spuriously > retransmitted because of a recent minimum RTT decrease (e.g. path > change)." > This defies my logic as RTT decrease should not result in spurious > retransmissions but help to avoid them. > > > "Note that > extensions that require additional TCP features (e.g. DSACK) would > work if the feature functions simply return false." > Please rephrase this. I suspect you meant that if some functions relate > to TCP features that are not available, the given code still works > as long as the functions related to such features return false when > the TCP feature is not available but that surely isn't what the > sentence currently says. > > Sect 7.2 Step 5 > > "For timely loss detection, the sender MAY > install a "reordering settling" timer set to fire at the earliest > moment at which it is safe to conclude that some packet is lost. The > earliest moment is the time it takes to expire the reordering window > of the earliest unacked packet in flight." > vs > RACK_detect_loss(): > ... > timeout =3D max(remaining, timeout) > Which way it is, "some" or "all"? The use of max() in RACK_detect_lost() > seems to indicate that the timeout will be set according to the longest > time, that is, the latest moment rather than earliest moments. Which > is the intented behavior here? (I can there might be merits in both > approaches). > > > In general, I didn't like the presentation order here as this form looks > the most obvious to me: > now >=3D Packet.xmit_ts + RACK.reo_wnd + (RACK.ack_ts - RACK.xmit_ts) > ...and I find the derivation of it just complicating things rather > than helping but that's perhaps just my opinion. > > > "It is also useful when the timestamp clock granularity is close to > or longer than the actual round trip time." > Given that some things based on timestamps will obviously stop working > if the clock is slower than one tick per RTT I found this fragment a bit > odd. RFC 7323 says "the clock SHOULD tick at least once per window's wort= h > of data". I can understand though that a host might find clock tick > granularity challenging due to extensive RTT range but on the same > I'd not want such a "too slow clock" behavior to be endorsed as if > it would be just normal. That is, I'm not against RACK handling > also this case nicely but it would be nice to somehow downplay the > normalness tone in it with something along the lines of "This check is > also useful if the recommended one tick per RTT cannot be achieved due > to timestamp clock granularity." > > Is RACK_detect_lost() supposed to detect also lost rexmits? How? > The rexmit code itself is not in the draft so it's hard to evaluate > how the Packet booleans are supposed to work in the first place. > I'm not saying the rexmit code should be included but currently it > surely looks like any rexmitted packet just remains .lost =3D TRUE and > .retransmitted =3D TRUE state until RTO? > > > Sect 7.4 > > "PTO" just appears out of nowhere (and is not even written open > in the first instance). > > "2. ... in step (2) of the algorithm." > "step (2)" is forward-refing, it would naturally refer back to > "Step 2: Update RACK stats" so it makes very little sense as is. > > Sect 7.5 > > Separator missing for PTO: and TLPRxtOut: > > Sect 7.5.1 > > "3. Upon receiving a SACK that selectively acknowledges data that was > last sent before the segment with SEG.SEQ=3DSND.UNA was last > (re)transmitted" > This is hard to understand, perhaps rephrase it somehow? > > > "But choosing PTO to be > exactly an SRTT is likely to generate spurious probes given that > network delay variance and even end-system timings can easily push an > ACK to be above an SRTT. We chose PTO to be the next integral > multiple of SRTT. > > Similarly, network delay variations and end-system processing > latencies and timer granularities can easily delay ACKs beyond > 2*SRTT, so senders SHOULD add at least 2ms to a computed PTO value > (and MAY add more if the sending host OS timer granularity is more > coarse than 1ms)." > Does this later paragraph depend on some assumptions (such as very > low RTT?) as I don't otherwise understand why you say what you say > in the given order. First you said x & y can push ACK over SRTT so > we pick 2* but then you say the same things can push over 2*SRTT > too? > > WCDelAckT to terminology? > > Sect 7.5.2 > > TLP_send_probe(): > - Perhaps set TLPRxtOut somewhere? > - Add "Arm RTO" to the end? > > "In the case where > there is only one original outstanding segment of data (N=3D1), the > same logic (trivially) applies: an ACK for a single outstanding > segment tells the sender the N-1=3D0 segments preceding that segment > were lost. Furthermore, whether there are N>1 or N=3D1 outstanding > segments," > If this distinction is useful to make at all, maybe just simply say: > "Applies also in case N=3D1." > > Sect 7.6 > > "SND.NXT at the time the episode started." > Isn't this TLPHighRxt, why not use it here? > > Sect 7.6.2 > > "Upon sending a TLP probe that is a retransmission, the sender sets > TLPRxtOut to true and TLPHighRxt to SND.NXT." > This should appear in TLP_send_probe(). > > "Detecting recoveries accomplished by loss probes" > Did you want to start another section here? > > "Step 1: Track ACKs ..." until what point? (It's told on later but > this question comes into mind when reading the draft in order). > > > Sect 7.4 - 7.6.2 > > In general, this particular part of the draft seems to require some > further editing. After reading it all through, I feel most bits are > present but the text is very hard to follow. I think the presentation > order needs significant work. There are random bits here and there > that are explained only later. Also, algorithm lacks some parts > discussed only in the text but variable like items should definitely > be included to the algorithm. > > > Sect 8.4 > > "RACK is compatible with and does not interfere with the the standard > RTO [RFC6298], RTO-restart [RFC7765], F-RTO [RFC5682] and Eifel > algorithms [RFC3522]. ... > It neither changes the RTO timer calculation nor detects spurious > timeouts." > For F-RTO, also send order is significant. > > Sect 8.5 > > SHOULDs PRR (and also placed to normative references) that is only > experimental and RACK aims to standards track. I feel that PRR is > disjoint enough anyway, which I think was also your intention when > maintaining the decoupling CC and RACK, that it's bit odd to take > this strong stance on PRR (indepedent of the stds track vs > experimental thing). > > "due to congestion window validation." > Does this refer to CWV as in RFC? Or some other mechanism in which > case you shouldn't use the same term here. > > I find the described scenario somewhat unconvincing becase > the description ends with: > "... > The ending congestion window after recovery also impacts > subsequent data transfer." > ...First there wasn't enough data to fill cwnd of 20 packets and > then suddenly transferring that non-existing data is impacted. > > References > > QUIC-LR is very old ref and even the filename has changed a few > times from draft-tsvwg-... > > > Nits > > "runt" made the sentence incomprehendable for me, I had to look up > that word (and only second source was descriptive enough that I > think I could understand the meaning, and I'd guessed wrong because > I thought there was some special intent here because of the quotes). > > is dicussed -> is discussed > RACT.RTT -> RACK.rtt > First "TSO" -> TCP Segmentation Offload (TSO) > grainularity -> granularity > higher-sequenc -> higher-sequence > > > -- > i. > --0000000000001f5aa705a073df45 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Ilpo,

Thanks for a detailed review a= nd the great suggestions. Here's all the edits we made.

=C2=A0We defined the missing terms and addressed = the nits, removed the less critical parts like recommending PRR, and edited= TLP algorithms (sections 7.4 to 7.6). I hope you find it's better now = and would be happy to hear any improvements you'd=C2=A0like to make.

Yuchung

On Fri, Feb 14, 2020 at 4:22 AM Ilpo J=C3=A4r= vinen <ilpo.jarvinen@cs.helsinki.fi> wrote:
In general, I find the draft quite good shape = already, it's quite easy
to read and follow (that is, except the TLP sections that are specifically =
mentioned below).

Here's the list of issues I came across:

Sect 6.1

"RACK.pkts_sacked" lacks the empty line separator.

Sect 7.2

=C2=A0 "This
=C2=A0 =C2=A0heuristic would fail to update RACK stats if the packet is spu= riously
=C2=A0 =C2=A0retransmitted because of a recent minimum RTT decrease (e.g. p= ath
=C2=A0 =C2=A0change)."
This defies my logic as RTT decrease should not result in spurious
retransmissions but help to avoid them.


=C2=A0 "Note that
=C2=A0 =C2=A0extensions that require additional TCP features (e.g.=C2=A0 DS= ACK) would
=C2=A0 =C2=A0work if the feature functions simply return false."
Please rephrase this. I suspect you meant that if some functions relate
to TCP features that are not available, the given code still works
as long as the functions related to such features return false when
the TCP feature is not available but that surely isn't what the
sentence currently says.

Sect 7.2 Step 5

=C2=A0 "For timely loss detection, the sender MAY
=C2=A0 =C2=A0install a "reordering settling" timer set to fire at= the earliest
=C2=A0 =C2=A0moment at which it is safe to conclude that some packet is los= t.=C2=A0 The
=C2=A0 =C2=A0earliest moment is the time it takes to expire the reordering = window
=C2=A0 =C2=A0of the earliest unacked packet in flight."
vs
=C2=A0 =C2=A0RACK_detect_loss():
=C2=A0 =C2=A0 =C2=A0 ...
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 timeout =3D max(remaining, timeout)
Which way it is, "some" or "all"? The use of max() in R= ACK_detect_lost()
seems to indicate that the timeout will be set according to the longest
time, that is, the latest moment rather than earliest moments. Which
is the intented behavior here? (I can there might be merits in both
approaches).


In general, I didn't like the presentation order here as this form look= s
the most obvious to me:
=C2=A0 =C2=A0now >=3D Packet.xmit_ts + RACK.reo_wnd + (RACK.ack_ts - RAC= K.xmit_ts)
...and I find the derivation of it just complicating things rather
than helping but that's perhaps just my opinion.


=C2=A0 =C2=A0"It is also useful when the timestamp clock granularity i= s close to
=C2=A0 =C2=A0 or longer than the actual round trip time."
Given that some things based on timestamps will obviously stop working
if the clock is slower than one tick per RTT I found this fragment a bit odd. RFC 7323 says "the clock SHOULD tick at least once per window'= ;s worth
of data". I can understand though that a host might find clock tick granularity challenging due to extensive RTT range but on the same
I'd not want such a "too slow clock" behavior to be endorsed = as if
it would be just normal. That is, I'm not against RACK handling
also this case nicely but it would be nice to somehow downplay the
normalness tone in it with something along the lines of "This check is=
also useful if the recommended one tick per RTT cannot be achieved due
to timestamp clock granularity."

Is RACK_detect_lost() supposed to detect also lost rexmits? How?
The rexmit code itself is not in the draft so it's hard to evaluate
how the Packet booleans are supposed to work in the first place.
I'm not saying the rexmit code should be included but currently it
surely looks like any rexmitted packet just remains .lost =3D TRUE and
.retransmitted =3D TRUE state until RTO?


Sect 7.4

"PTO" just appears out of nowhere (and is not even written open in the first instance).

=C2=A0 =C2=A0"2. ... in step (2) of the algorithm."
"step (2)" is forward-refing, it would naturally refer back to "Step 2: Update RACK stats" so it makes very little sense as is.<= br>
Sect 7.5

Separator missing for PTO: and TLPRxtOut:

Sect 7.5.1

=C2=A0 "3.=C2=A0 Upon receiving a SACK that selectively acknowledges d= ata that was
=C2=A0 =C2=A0 =C2=A0 =C2=A0last sent before the segment with SEG.SEQ=3DSND.= UNA was last
=C2=A0 =C2=A0 =C2=A0 =C2=A0(re)transmitted"
This is hard to understand, perhaps rephrase it somehow?


=C2=A0 "But choosing PTO to be
=C2=A0 =C2=A0exactly an SRTT is likely to generate spurious probes given th= at
=C2=A0 =C2=A0network delay variance and even end-system timings can easily = push an
=C2=A0 =C2=A0ACK to be above an SRTT.=C2=A0 We chose PTO to be the next int= egral
=C2=A0 =C2=A0multiple of SRTT.

=C2=A0 =C2=A0Similarly, network delay variations and end-system processing<= br> =C2=A0 =C2=A0latencies and timer granularities can easily delay ACKs beyond=
=C2=A0 =C2=A02*SRTT, so senders SHOULD add at least 2ms to a computed PTO v= alue
=C2=A0 =C2=A0(and MAY add more if the sending host OS timer granularity is = more
=C2=A0 =C2=A0coarse than 1ms)."
Does this later paragraph depend on some assumptions (such as very
low RTT?) as I don't otherwise understand why you say what you say
in the given order. First you said x & y can push ACK over SRTT so
we pick 2* but then you say the same things can push over 2*SRTT
too?

WCDelAckT to terminology?

Sect 7.5.2

TLP_send_probe():
=C2=A0 =C2=A0 =C2=A0 =C2=A0 - Perhaps set TLPRxtOut somewhere?
=C2=A0 =C2=A0 =C2=A0 =C2=A0 - Add "Arm RTO" to the end?

=C2=A0 "In the case where
=C2=A0 =C2=A0there is only one original outstanding segment of data (N=3D1)= , the
=C2=A0 =C2=A0same logic (trivially) applies: an ACK for a single outstandin= g
=C2=A0 =C2=A0segment tells the sender the N-1=3D0 segments preceding that s= egment
=C2=A0 =C2=A0were lost.=C2=A0 Furthermore, whether there are N>1 or N=3D= 1 outstanding
=C2=A0 =C2=A0segments,"
If this distinction is useful to make at all, maybe just simply say:
"Applies also in case N=3D1."

Sect 7.6

=C2=A0 "SND.NXT at the time the episode started."
Isn't this TLPHighRxt, why not use it here?

Sect 7.6.2

=C2=A0 "Upon sending a TLP probe that is a retransmission, the sender = sets
=C2=A0 =C2=A0TLPRxtOut to true and TLPHighRxt to SND.NXT."
This should appear in TLP_send_probe().

"Detecting recoveries accomplished by loss probes"
Did you want to start another section here?

"Step 1: Track ACKs ..." until what point? (It's told on late= r but
this question comes into mind when reading the draft in order).


Sect 7.4 - 7.6.2

In general, this particular part of the draft seems to require some
further editing. After reading it all through, I feel most bits are
present but the text is very hard to follow. I think the presentation
order needs significant work. There are random bits here and there
that are explained only later. Also, algorithm lacks some parts
discussed only in the text but variable like items should definitely
be included to the algorithm.


Sect 8.4

=C2=A0 "RACK is compatible with and does not interfere with the the st= andard
=C2=A0 =C2=A0RTO [RFC6298], RTO-restart [RFC7765], F-RTO [RFC5682] and Eife= l
=C2=A0 =C2=A0algorithms [RFC3522]. ...
=C2=A0 =C2=A0It neither changes the RTO timer calculation nor detects spuri= ous
=C2=A0 =C2=A0timeouts."
For F-RTO, also send order is significant.

Sect 8.5

SHOULDs PRR (and also placed to normative references) that is only
experimental and RACK aims to standards track. I feel that PRR is
disjoint enough anyway, which I think was also your intention when
maintaining the decoupling CC and RACK, that it's bit odd to take
this strong stance on PRR (indepedent of the stds track vs
experimental thing).

=C2=A0 "due to congestion window validation."
Does this refer to CWV as in RFC? Or some other mechanism in which
case you shouldn't use the same term here.

I find the described scenario somewhat unconvincing becase
the description ends with:
=C2=A0 "...
=C2=A0 =C2=A0The ending congestion window after recovery also impacts
=C2=A0 =C2=A0subsequent data transfer."
...First there wasn't enough data to fill cwnd of 20 packets and
then suddenly transferring that non-existing data is impacted.

References

QUIC-LR is very old ref and even the filename has changed a few
times from draft-tsvwg-...


Nits

"runt" made the sentence incomprehendable for me, I had to look u= p
that word (and only second source was descriptive enough that I
think I could understand the meaning, and I'd guessed wrong because
I thought there was some special intent here because of the quotes).

is dicussed -> is discussed
RACT.RTT -> RACK.rtt
First "TSO" -> TCP Segmentation Offload (TSO)
grainularity -> granularity
higher-sequenc -> higher-sequence


--
=C2=A0i.
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([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SJBt12BlJSPe for ; Tue, 10 Mar 2020 04:14:11 -0700 (PDT) Received: from drew.franken.de (drew.ipv6.franken.de [IPv6:2001:638:a02:a001:20e:cff:fe4a:feaa]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 33B5F3A0C8A for ; Tue, 10 Mar 2020 04:14:10 -0700 (PDT) Received: from [IPv6:2a02:8109:1140:c3d:fcad:c4b5:d3f7:931] (unknown [IPv6:2a02:8109:1140:c3d:fcad:c4b5:d3f7:931]) (Authenticated sender: macmic) by mail-n.franken.de (Postfix) with ESMTPSA id 968BC721E281A for ; Tue, 10 Mar 2020 12:14:06 +0100 (CET) From: Michael Tuexen Content-Type: multipart/signed; boundary="Apple-Mail=_A8CCDF29-14AA-45B8-8252-79D3060E48A8"; protocol="application/pkcs7-signature"; micalg=sha-256 Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3608.60.0.2.5\)) Message-Id: <1932F81F-CBAC-44B6-93CF-A770A5434ED9@fh-muenster.de> Date: Tue, 10 Mar 2020 12:14:05 +0100 To: tcpm IETF list X-Mailer: Apple Mail (2.3608.60.0.2.5) Archived-At: Subject: [tcpm] WGLC for draft-ietf-tcpm-rack-08 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 11:14:15 -0000 --Apple-Mail=_A8CCDF29-14AA-45B8-8252-79D3060E48A8 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii Dear all, this e-mail starts the working group last call for draft-ietf-tcpm-rack-08. This WGLC runs until Tuesday, April 7th 2020. Please send any comments, including indications to support this document, to the TCMP mailing list by then. The ID is available at https://tools.ietf.org/html/draft-ietf-tcpm-rack-08 Best regards Michael --Apple-Mail=_A8CCDF29-14AA-45B8-8252-79D3060E48A8 Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEKow ggUSMIID+qADAgECAgkA4wvV+K8l2YEwDQYJKoZIhvcNAQELBQAwgYIxCzAJBgNVBAYTAkRFMSsw KQYDVQQKDCJULVN5c3RlbXMgRW50ZXJwcmlzZSBTZXJ2aWNlcyBHbWJIMR8wHQYDVQQLDBZULVN5 c3RlbXMgVHJ1c3QgQ2VudGVyMSUwIwYDVQQDDBxULVRlbGVTZWMgR2xvYmFsUm9vdCBDbGFzcyAy MB4XDTE2MDIyMjEzMzgyMloXDTMxMDIyMjIzNTk1OVowgZUxCzAJBgNVBAYTAkRFMUUwQwYDVQQK EzxWZXJlaW4genVyIEZvZXJkZXJ1bmcgZWluZXMgRGV1dHNjaGVuIEZvcnNjaHVuZ3NuZXR6ZXMg ZS4gVi4xEDAOBgNVBAsTB0RGTi1QS0kxLTArBgNVBAMTJERGTi1WZXJlaW4gQ2VydGlmaWNhdGlv biBBdXRob3JpdHkgMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMtg1/9moUHN0vqH l4pzq5lN6mc5WqFggEcVToyVsuXPztNXS43O+FZsFVV2B+pG/cgDRWM+cNSrVICxI5y+NyipCf8F 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SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham 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 fPVu8-4vbkrs for ; Tue, 10 Mar 2020 15:00:38 -0700 (PDT) Received: from server.dnsblock1.com (server.dnsblock1.com [85.13.236.178]) (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 D0DFD3A0F0E for ; Tue, 10 Mar 2020 15:00:37 -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=qGJ8X69bsxGzsq10An2UCxHlqzMi8PLBAJ3whC4Zj1I=; b=tic6pnjV4WwjTPbUKXEDClHU3 zKfNCXdKWWrFPbzTylC5SRF0SpgScCsrd90pQM6aL8DPevSkqK41+NGDTspIhvOmAlGS7WYJWPOVv DLcTT000gmgMFDlmScC16IUk6gt+JBhU+RSxghtZIu0I36TjtlbkD9ZB1rBprNB1jO13xxZhGR4nG Gn7t4mPRLnu96MWbaZRghGhYeIkB+O4fyDamZHW1alFoTVcc/Wdk55VECQiRY/nRuwYJ5jR5+OslG lurvopymCV1/2LHHr2BoKdwUfKqOSaGtXaSQ17HuZjL0daN/SarQoz/IfAwwV5tM3djIyRNL9xY3O BQYNJOWCA==; Received: from [31.185.128.125] (port=47832 helo=[192.168.0.6]) by server.dnsblock1.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.92) (envelope-from ) id 1jBmvS-000647-Si; Tue, 10 Mar 2020 22:00:35 +0000 To: "Scharf, Michael" , tcpm IETF list Cc: Richard Scheffenegger , Mirja Kuehlewind References: <6EC6417807D9754DA64F3087E2E2E03E2D9CA5C4@rznt8114.rznt.rzdir.fht-esslingen.de> From: Bob Briscoe Message-ID: Date: Tue, 10 Mar 2020 22:00:34 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <6EC6417807D9754DA64F3087E2E2E03E2D9CA5C4@rznt8114.rznt.rzdir.fht-esslingen.de> Content-Type: multipart/alternative; boundary="------------796926BA0FC93C9BF4070424" Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com 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: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: Re: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-ecn-11.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 22:00:48 -0000 This is a multi-part message in MIME format. --------------796926BA0FC93C9BF4070424 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Michael, I agree extensibility is nice. And I'm open to a design with a 1 octet field immediately after the length field, for flags and the like. In fact, I encouraged Ilpo to put his idea to the list (which he had put to be offlist). But let's be disciplined about this if we're going to start down this road... 1) This is not the time for "it would be nice if". I want to go back to your original email and ask you to be much more specific about the problems envisaged. I agree the idea of switching field order based on the first bit is unorthodox, but what is actually "not robust" about it? In what case(s) can it fail? Have you proved these problems exist (whether paper proof or empirical)? 2) We have a very *inextensible* lack of TCP option space to deal with. And we don't know what other important options might be invented in future. So we shouldn't burn even a single byte unless we have good reason to. Extensibility is good. But it does burn space. 3) I haven't asked my co-authors, but I know that Mirja wanted the design to be as simple as possible, and now we're moving away from that. If it ain't broken don't fix it. Bob On 09/03/2020 20:00, Scharf, Michael wrote: > > With chair hat off, I really wonder if the solution to encode the two > different orders in the TCP Option is an example for good and robust > protocol engineering. > > For instance, the current design makes it hard to decode the field in > a monitoring tool (such as Wireshark). Also, as far as I understand, > it does not allow to switch the encoding during a connection, which > limits flexibility. We almost certainly do not understand **now** all > future use cases of this Standard. > > Unless I miss something, there would be several other solutions: > > First, IMHO, we have enough TCP option codepoints left to spend two > codepoints if there is a good reason for doing so. As compared to the > current design proposal in -10/-11, spending two different option > kinds would look to me like **much** better protocol engineering. > > Second, if the TCPM community insists in only one option kind > codepoint for whatever reason, IMHO one could add one „sub-type“ byte > to the option. The TCP Option field has to be multiples of 4 byte, > i.e., if a segment only contains a 11 byte AccECN TCP option, an > additional NOP TCP option is needed for padding, no? So, what downside > have 12 bytes as compared to 11 bytes? For the shorter variants, the > overhead of a „sub-type“ field increases, but it may still be within > reasonable limits. What do I miss? > > Third, one could use different lengths for the different orders, e.g., > lenths 5/8/11 for type 0 and 6/9/12 for type 12. Is this not possible? > > In all these cases, the resulting protocol looks simpler and more > robust to me. What prevents us from using the KISS principle? > > Michael > > *Von: *Bob Briscoe > *Gesendet: *Freitag, 6. März 2020 04:34 > *An: *tcpm IETF list > *Cc: *Richard Scheffenegger ; > Mirja Kuehlewind > *Betreff: *Re: [tcpm] New Version Notification for > draft-ietf-tcpm-accurate-ecn-11.txt > > tcpm, > > You will have seen draft-10 then draft-11 in quick succession, as > already explained. > The diffs from draft-09 to -10 were those that had built up since Jul'19. > The diffs from draft-10 to -11 were solely those for the change from > EXP track to STD track. > Draft-10 doesn't seem to display in the list of links to each version, > but you can manually write the URL. > > The main technical changes in draft-10 were numerous - many will be > recognized from list discussion since Jul'19. > Particular thanks to Ilpo Järvinen who identified many niggles (and > their solutions) while writing and testing a full Linux implementation > (based on Olivier Tilmans's, in turn based on Mirja's). > > * Allowed 2 different orders of the fields in the AccECN Option > * Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also > on first data packet > o greatly simplifies implementation, esp with TFO. > o repeating on first data packet was for reliable delivery, > which is now achieved with ACE counter (see next bullet) > * Increment the ACE counter if CE on SYN/ACK (but still not if CE on > SYN) > o Reliable delivery of feedback of CE on SYN/ACK > * Redefine 'first packet' as first to arrive, not first in sequence > in 2 cases: > o Handshake reflection on the ACK of the SYN/ACK > o In the test for zeroing of ACE > o Reason: greatly simplifies implementation > * if ACE could have wrapped more than once, SHOULD assume “safest > likely case” > not "conservatively assume" it did cycle > o Reason: avoid unnecessary hit on performance > * More robustness (with flexibility) in rules for when to include an > AccECN Option > o Change-triggered AccECN Option as SHOULD, not MUST > o SHOULD follow change-triggered AccECN Option with another > (removes ambiguity if ACK thinning or loss) > o when same counter continues to increment, SHOULD consistently > include it every n ACKs > o Made rule about precedence of SACK conditional (max 2 SACK > blocks) > o MAY exclude counters that have not changed for the whole > connection > * Allowed an AccECN server not to implement RFC3168 ECN (all clients > still have to) > * Precluded mixed capability negotiation from either end > o reduces freedom to choose SYN & SYN/ACK fall-back strategies > o to prevent cases where each end's outcome after handshake > could be inconsistent (in reordering corner-cases) > * Reserved the codepoint combination used by the historic nonce case > * Merged in a number of points from RFC3168 that we hadn't covered > o (a whole new subsection about obligations to do with ECN) > * Explicit about checking "acceptable packets" > o before counting their ECN markings or before counting the ECN > feedback they carry > * Required retransmitted Fallback SYN to use same ISN > o allows servers to detect ECN downgrade SYN attacks > * Handled corner cases like In-window SYN during TIME-WAIT > > > > Bob > > On 06/03/2020 02:24, internet-drafts@ietf.org > wrote: > > A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt > > has been successfully submitted by Bob Briscoe and posted to the > > IETF repository. > > Name:            draft-ietf-tcpm-accurate-ecn > > Revision: 11 > > Title:           More Accurate ECN Feedback in TCP > > Document date:   2020-03-05 > > Group:           tcpm > > Pages:           58 > > URL:https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accurate-ecn-11.txt > > Status:https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/ > > Htmlized:https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11 > > Htmlized:https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn > > Diff:https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-11 > > Abstract: > >    Explicit Congestion Notification (ECN) is a mechanism where network > >    nodes can mark IP packets instead of dropping them to indicate > >    incipient congestion to the end-points.  Receivers with an ECN- > >    capable transport protocol feed back this information to the sender. > >    ECN is specified for TCP in such a way that only one feedback signal > >    can be transmitted per Round-Trip Time (RTT).  Recent new TCP > >    mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP) > >    or Low Latency Low Loss Scalable Throughput (L4S) need more accurate > >    ECN feedback information whenever more than one marking is received > >    in one RTT.  This document specifies a scheme to provide more than > >    one feedback signal per RTT in the TCP header.  Given TCP header > >    space is scarce, it allocates a reserved header bit, that was > >    previously used for the ECN-Nonce which has now been declared > >    historic.  It also overloads the two existing ECN flags in the TCP > >    header.  The resulting extra space is exploited to feed back the IP- > >    ECN field received during the 3-way handshake as well.  Supplementary > >    feedback information can optionally be provided in a new TCP option, > >    which is never used on the TCP SYN. > > > > Please note that it may take a couple of minutes from the time of submission > > until the htmlized version and diff are available at tools.ietf.org. > > The IETF Secretariat > > > > -- > ________________________________________________________________ > Bob Briscoehttp://bobbriscoe.net/ > -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ --------------796926BA0FC93C9BF4070424 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit Michael,

I agree extensibility is nice. And I'm open to a design with a 1 octet field immediately after the length field, for flags and the like. In fact, I encouraged Ilpo to put his idea to the list (which he had put to be offlist). But let's be disciplined about this if we're going to start down this road...

1) This is not the time for "it would be nice if". I want to go back to your original email and ask you to be much more specific about the problems envisaged. I agree the idea of switching field order based on the first bit is unorthodox, but what is actually "not robust" about it? In what case(s) can it fail? Have you proved these problems exist (whether paper proof or empirical)?

2) We have a very *inextensible* lack of TCP option space to deal with. And we don't know what other important options might be invented in future. So we shouldn't burn even a single byte unless we have good reason to. Extensibility is good. But it does burn space.

3) I haven't asked my co-authors, but I know that Mirja wanted the design to be as simple as possible, and now we're moving away from that.

If it ain't broken don't fix it.



Bob

On 09/03/2020 20:00, Scharf, Michael wrote:

With chair hat off, I really wonder if the solution to encode the two different orders in the TCP Option is an example for good and robust protocol engineering.

 

For instance, the current design makes it hard to decode the field in a monitoring tool (such as Wireshark). Also, as far as I understand, it does not allow to switch the encoding during a connection, which limits flexibility. We almost certainly do not understand *now* all future use cases of this Standard.

 

Unless I miss something, there would be several other solutions:

 

First, IMHO, we have enough TCP option codepoints left to spend two codepoints if there is a good reason for doing so. As compared to the current design proposal in -10/-11, spending two different option kinds would look to me like *much* better protocol engineering.

 

Second, if the TCPM community insists in only one option kind codepoint for whatever reason, IMHO one could add one „sub-type“ byte to the option. The TCP Option field has to be multiples of 4 byte, i.e., if a segment only contains a 11 byte AccECN TCP option, an additional NOP TCP option is needed for padding, no? So, what downside have 12 bytes as compared to 11 bytes? For the shorter variants, the overhead of a „sub-type“ field increases, but it may still be within reasonable limits. What do I miss?

 

Third, one could use different lengths for the different orders, e.g., lenths 5/8/11 for type 0 and 6/9/12 for type 12. Is this not possible?

 

In all these cases, the resulting protocol looks simpler and more robust to me. What prevents us from using the KISS principle?

 

Michael

 

 

 

Von: Bob Briscoe
Gesendet: Freitag, 6. März 2020 04:34
An: tcpm IETF list
Cc: Richard Scheffenegger; Mirja Kuehlewind
Betreff: Re: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-ecn-11.txt

 

tcpm,

You will have seen draft-10 then draft-11 in quick succession, as already explained.
The diffs from draft-09 to -10 were those that had built up since Jul'19.
The diffs from draft-10 to -11 were solely those for the change from EXP track to STD track.
Draft-10 doesn't seem to display in the list of links to each version, but you can manually write the URL.

The main technical changes in draft-10 were numerous - many will be recognized from list discussion since Jul'19.
Particular thanks to Ilpo Järvinen who identified many niggles (and their solutions) while writing and testing a full Linux implementation (based on Olivier Tilmans's, in turn based on Mirja's).

  • Allowed 2 different orders of the fields in the AccECN Option
  • Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also on first data packet
    • greatly simplifies implementation, esp with TFO.
    • repeating on first data packet was for reliable delivery, which is now achieved with ACE counter (see next bullet)
  • Increment the ACE counter if CE on SYN/ACK (but still not if CE on SYN)
    • Reliable delivery of feedback of CE on SYN/ACK
  • Redefine 'first packet' as first to arrive, not first in sequence in 2 cases:
    • Handshake reflection on the ACK of the SYN/ACK
    • In the test for zeroing of ACE
    • Reason: greatly simplifies implementation
  • if ACE could have wrapped more than once, SHOULD assume “safest likely case”
    not "conservatively assume" it did cycle
    • Reason: avoid unnecessary hit on performance
  • More robustness (with flexibility) in rules for when to include an AccECN Option
    • Change-triggered AccECN Option as SHOULD, not MUST
    • SHOULD follow change-triggered AccECN Option with another (removes ambiguity if ACK thinning or loss)
    • when same counter continues to increment, SHOULD consistently include it every n ACKs
    • Made rule about precedence of SACK conditional (max 2 SACK blocks)
    • MAY exclude counters that have not changed for the whole connection
  • Allowed an AccECN server not to implement RFC3168 ECN (all clients still have to)
  • Precluded mixed capability negotiation from either end
    • reduces freedom to choose SYN & SYN/ACK fall-back strategies
    • to prevent cases where each end's outcome after handshake could be inconsistent (in reordering corner-cases)
  • Reserved the codepoint combination used by the historic nonce case
  • Merged in a number of points from RFC3168 that we hadn't covered
    • (a whole new subsection about obligations to do with ECN)
  • Explicit about checking "acceptable packets"
    • before counting their ECN markings or before counting the ECN feedback they carry
  • Required retransmitted Fallback SYN to use same ISN
    • allows servers to detect ECN downgrade SYN attacks
  • Handled corner cases like In-window SYN during TIME-WAIT



Bob

On 06/03/2020 02:24, internet-drafts@ietf.org wrote:

 
A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt
has been successfully submitted by Bob Briscoe and posted to the
IETF repository.
 
Name:            draft-ietf-tcpm-accurate-ecn
Revision: 11
Title:           More Accurate ECN Feedback in TCP
Document date:   2020-03-05
Group:           tcpm
Pages:           58
URL:            https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accurate-ecn-11.txt
Status:         https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/
Htmlized:       https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11
Htmlized:       https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn
Diff:           https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-11
 
Abstract:
   Explicit Congestion Notification (ECN) is a mechanism where network
   nodes can mark IP packets instead of dropping them to indicate
   incipient congestion to the end-points.  Receivers with an ECN-
   capable transport protocol feed back this information to the sender.
   ECN is specified for TCP in such a way that only one feedback signal
   can be transmitted per Round-Trip Time (RTT).  Recent new TCP
   mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP)
   or Low Latency Low Loss Scalable Throughput (L4S) need more accurate
   ECN feedback information whenever more than one marking is received
   in one RTT.  This document specifies a scheme to provide more than
   one feedback signal per RTT in the TCP header.  Given TCP header
   space is scarce, it allocates a reserved header bit, that was
   previously used for the ECN-Nonce which has now been declared
   historic.  It also overloads the two existing ECN flags in the TCP
   header.  The resulting extra space is exploited to feed back the IP-
   ECN field received during the 3-way handshake as well.  Supplementary
   feedback information can optionally be provided in a new TCP option,
   which is never used on the TCP SYN.
 
                                                                                  
 
 
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
 
The IETF Secretariat
 
 



-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/

 


-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/
--------------796926BA0FC93C9BF4070424-- From nobody Tue Mar 10 16:27:44 2020 Return-Path: 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 466A13A08B3 for ; Tue, 10 Mar 2020 16:27:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 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, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=hs-esslingen.de 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 qruw4CRWFmUr for ; Tue, 10 Mar 2020 16:27:40 -0700 (PDT) Received: from mail.hs-esslingen.de (mail.hs-esslingen.de [134.108.32.78]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 94DFF3A08A7 for ; Tue, 10 Mar 2020 16:27:39 -0700 (PDT) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.hs-esslingen.de (Postfix) with ESMTP id 4E29B25A12; Wed, 11 Mar 2020 00:27:37 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hs-esslingen.de; s=mail; t=1583882857; bh=g+E10hjJ/wzQvGAyFx2Dh/MzJkKHUDmhMnrjIX3lnCI=; h=From:To:CC:Subject:Date:References:In-Reply-To:From; b=YgYCeDue+z7qnnrijL5/mHiD9nTK/SuFWQL8wm1f0rSyzi0N1nRox9VU+KDqEQjis K3ucxCuC6xrML97R2X6e76CWu3b21z6oP0Wb4q7NMvRFKcAkhlOpmjTJWNHrHmp0ov NEhPDL1RjLspzftQgsXh9T7kC7KoOpewGYrsZ2ls= X-Virus-Scanned: by amavisd-new-2.7.1 (20120429) (Debian) at hs-esslingen.de Received: from mail.hs-esslingen.de ([127.0.0.1]) by localhost (hs-esslingen.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wb47dpuLZmFX; Wed, 11 Mar 2020 00:27:35 +0100 (CET) Received: from rznt8101.rznt.rzdir.fht-esslingen.de (rznt8101.rznt.rzdir.fht-esslingen.de [134.108.29.101]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mail.hs-esslingen.de (Postfix) with ESMTPS; Wed, 11 Mar 2020 00:27:35 +0100 (CET) Received: from RZNT8114.rznt.rzdir.fht-esslingen.de ([169.254.3.209]) by rznt8101.rznt.rzdir.fht-esslingen.de ([fe80::bd73:d6a9:24d7:95f1%10]) with mapi id 14.03.0468.000; Wed, 11 Mar 2020 00:27:34 +0100 From: "Scharf, Michael" To: Bob Briscoe , tcpm IETF list CC: Richard Scheffenegger , Mirja Kuehlewind Thread-Topic: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-ecn-11.txt Thread-Index: AdX2TV9bQx+r5ugBR/WWKYLzMpk50gA0ZGIAAAUiaFw= Date: Tue, 10 Mar 2020 23:27:35 +0000 Message-ID: <6EC6417807D9754DA64F3087E2E2E03E2D9D2380@rznt8114.rznt.rzdir.fht-esslingen.de> References: <6EC6417807D9754DA64F3087E2E2E03E2D9CA5C4@rznt8114.rznt.rzdir.fht-esslingen.de>, In-Reply-To: Accept-Language: de-DE, en-US Content-Language: de-DE X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: multipart/alternative; boundary="_000_6EC6417807D9754DA64F3087E2E2E03E2D9D2380rznt8114rzntrzd_" MIME-Version: 1.0 Archived-At: Subject: Re: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-ecn-11.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 23:27:43 -0000 --_000_6EC6417807D9754DA64F3087E2E2E03E2D9D2380rznt8114rzntrzd_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Bob, Out of my head, I am not aware of any IETF protocol that uses TLV encoding = with ambiguous message formats, i.e., message with the same type but differ= ent message formats depending on earlier messages. For instance, this can e= asily get messy during debugging. And a protocol that is hard to debug is *= not robust* in my point of view. I have already pointed out that IMHO a tool like Wireshark cannot correctly= decode the option for a partial PCAP trace. The same applies to any passiv= e monitoring tool that uses sampling. This has significant operational impa= ct. Well, your mileage may vary, but I see no value in obscuring the counte= rs by an =84unorthodox=93 encoding that requires keeping state to figure ou= t what the option format actually is. And I am not a hardware expert, but if AccECN should really be sucessful, h= ardware offloading in NICs will probably matter in future. Thus, the length= of options is not the only tradeoff to be considered to make the protocol = sucessful. As far as I understand, simple stateless message formats help a = lot when it comes to hardware offloading. It is well understood that many implementers may try to avoid the option al= together. An =84unorthodox=93 encoding will almost certainly not help to ge= t the option widely deployed. Just to repeat myself, if I had to pick between the current proposal in -11= and two different option codepoints, I would go for the latter. We have >1= 50 TCP option codepoints left. That resource is not so scarce after all. I = fail to see any real-world benefit of the proposal in -11 as compared to tw= o separate codepoints. In a nutshell, I believe you should look for an option design that can be p= rocessed by a stateless decoder. In other words, KISS. There are plenty of = ways how to do that, and adding a byte is only one of them. I have already = mentioned several other alternatives, and probably there are more (e.g., on= e could use a 2-bit type field for each counter to identify it). All of the= m seem *simpler* to me than the current proposal in -11. To me, this idea in -11 *is broken* and this should be fixed in -12. Michael Von: Bob Briscoe Gesendet: Dienstag, 10. M=E4rz 2020 23:00 An: Scharf, Michael; tcpm IETF list<= mailto:tcpm@ietf.org> Cc: Richard Scheffenegger; Mirja K= uehlewind Betreff: Re: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-e= cn-11.txt Michael, I agree extensibility is nice. And I'm open to a design with a 1 octet fiel= d immediately after the length field, for flags and the like. In fact, I en= couraged Ilpo to put his idea to the list (which he had put to be offlist).= But let's be disciplined about this if we're going to start down this road= ... 1) This is not the time for "it would be nice if". I want to go back to you= r original email and ask you to be much more specific about the problems en= visaged. I agree the idea of switching field order based on the first bit i= s unorthodox, but what is actually "not robust" about it? In what case(s) c= an it fail? Have you proved these problems exist (whether paper proof or em= pirical)? 2) We have a very *inextensible* lack of TCP option space to deal with. And= we don't know what other important options might be invented in future. So= we shouldn't burn even a single byte unless we have good reason to. Extens= ibility is good. But it does burn space. 3) I haven't asked my co-authors, but I know that Mirja wanted the design t= o be as simple as possible, and now we're moving away from that. If it ain't broken don't fix it. Bob On 09/03/2020 20:00, Scharf, Michael wrote: With chair hat off, I really wonder if the solution to encode the two diffe= rent orders in the TCP Option is an example for good and robust protocol en= gineering. For instance, the current design makes it hard to decode the field in a mon= itoring tool (such as Wireshark). Also, as far as I understand, it does not= allow to switch the encoding during a connection, which limits flexibility= . We almost certainly do not understand *now* all future use cases of this = Standard. Unless I miss something, there would be several other solutions: First, IMHO, we have enough TCP option codepoints left to spend two codepoi= nts if there is a good reason for doing so. As compared to the current desi= gn proposal in -10/-11, spending two different option kinds would look to m= e like *much* better protocol engineering. Second, if the TCPM community insists in only one option kind codepoint for= whatever reason, IMHO one could add one =84sub-type=93 byte to the option.= The TCP Option field has to be multiples of 4 byte, i.e., if a segment onl= y contains a 11 byte AccECN TCP option, an additional NOP TCP option is nee= ded for padding, no? So, what downside have 12 bytes as compared to 11 byte= s? For the shorter variants, the overhead of a =84sub-type=93 field increas= es, but it may still be within reasonable limits. What do I miss? Third, one could use different lengths for the different orders, e.g., lent= hs 5/8/11 for type 0 and 6/9/12 for type 12. Is this not possible? In all these cases, the resulting protocol looks simpler and more robust to= me. What prevents us from using the KISS principle? Michael Von: Bob Briscoe Gesendet: Freitag, 6. M=E4rz 2020 04:34 An: tcpm IETF list Cc: Richard Scheffenegger; Mirja K= uehlewind Betreff: Re: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-e= cn-11.txt tcpm, You will have seen draft-10 then draft-11 in quick succession, as already e= xplained. The diffs from draft-09 to -10 were those that had built up since Jul'19. The diffs from draft-10 to -11 were solely those for the change from EXP tr= ack to STD track. Draft-10 doesn't seem to display in the list of links to each version, but = you can manually write the URL. The main technical changes in draft-10 were numerous - many will be recogni= zed from list discussion since Jul'19. Particular thanks to Ilpo J=E4rvinen who identified many niggles (and their= solutions) while writing and testing a full Linux implementation (based on= Olivier Tilmans's, in turn based on Mirja's). * Allowed 2 different orders of the fields in the AccECN Option * Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also on f= irst data packet * greatly simplifies implementation, esp with TFO. * repeating on first data packet was for reliable delivery, which is= now achieved with ACE counter (see next bullet) * Increment the ACE counter if CE on SYN/ACK (but still not if CE on SY= N) * Reliable delivery of feedback of CE on SYN/ACK * Redefine 'first packet' as first to arrive, not first in sequence in = 2 cases: * Handshake reflection on the ACK of the SYN/ACK * In the test for zeroing of ACE * Reason: greatly simplifies implementation * if ACE could have wrapped more than once, SHOULD assume =93safest lik= ely case=94 not "conservatively assume" it did cycle * Reason: avoid unnecessary hit on performance * More robustness (with flexibility) in rules for when to include an Ac= cECN Option * Change-triggered AccECN Option as SHOULD, not MUST * SHOULD follow change-triggered AccECN Option with another (removes= ambiguity if ACK thinning or loss) * when same counter continues to increment, SHOULD consistently incl= ude it every n ACKs * Made rule about precedence of SACK conditional (max 2 SACK blocks) * MAY exclude counters that have not changed for the whole connectio= n * Allowed an AccECN server not to implement RFC3168 ECN (all clients st= ill have to) * Precluded mixed capability negotiation from either end * reduces freedom to choose SYN & SYN/ACK fall-back strategies * to prevent cases where each end's outcome after handshake could be= inconsistent (in reordering corner-cases) * Reserved the codepoint combination used by the historic nonce case * Merged in a number of points from RFC3168 that we hadn't covered * (a whole new subsection about obligations to do with ECN) * Explicit about checking "acceptable packets" * before counting their ECN markings or before counting the ECN feed= back they carry * Required retransmitted Fallback SYN to use same ISN * allows servers to detect ECN downgrade SYN attacks * Handled corner cases like In-window SYN during TIME-WAIT Bob On 06/03/2020 02:24, internet-drafts@ietf.org wrote: A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt has been successfully submitted by Bob Briscoe and posted to the IETF repository. Name: draft-ietf-tcpm-accurate-ecn Revision: 11 Title: More Accurate ECN Feedback in TCP Document date: 2020-03-05 Group: tcpm Pages: 58 URL: https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accura= te-ecn-11.txt Status: https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-e= cn/ Htmlized: https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11 Htmlized: https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accur= ate-ecn Diff: https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-accurat= e-ecn-11 Abstract: Explicit Congestion Notification (ECN) is a mechanism where network nodes can mark IP packets instead of dropping them to indicate incipient congestion to the end-points. Receivers with an ECN- capable transport protocol feed back this information to the sender. ECN is specified for TCP in such a way that only one feedback signal can be transmitted per Round-Trip Time (RTT). Recent new TCP mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP) or Low Latency Low Loss Scalable Throughput (L4S) need more accurate ECN feedback information whenever more than one marking is received in one RTT. This document specifies a scheme to provide more than one feedback signal per RTT in the TCP header. Given TCP header space is scarce, it allocates a reserved header bit, that was previously used for the ECN-Nonce which has now been declared historic. It also overloads the two existing ECN flags in the TCP header. The resulting extra space is exploited to feed back the IP- ECN field received during the 3-way handshake as well. Supplementary feedback information can optionally be provided in a new TCP option, which is never used on the TCP SYN. Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at tools.ietf.org. The IETF Secretariat -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ --_000_6EC6417807D9754DA64F3087E2E2E03E2D9D2380rznt8114rzntrzd_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

Bob,

 

Out of my head, I am not aware of any IETF protocol = that uses TLV encoding with ambiguous message formats, i.e., message with t= he same type but different message formats depending on earlier messages. F= or instance, this can easily get messy during debugging. And a protocol that is hard to debug is *not robust* in my point of view.

 

I have already pointed out that IMHO a tool like Wir= eshark cannot correctly decode the option for a partial PCAP trace. The sam= e applies to any passive monitoring tool that uses sampling. This has signi= ficant operational impact. Well, your mileage may vary, but I see no value in obscuring the counters by an =84un= orthodox=93 encoding that requires keeping state to figure out what the opt= ion format actually is.

 

And I am not a hardware expert, but if AccECN should= really be sucessful, hardware offloading in NICs will probably matter in f= uture. Thus, the length of options is not the only tradeoff to be considere= d to make the protocol sucessful. As far as I understand, simple stateless message formats help a lot when i= t comes to hardware offloading.

 

It is well understood that many implementers may try= to avoid the option altogether. An =84unorthodox=93 encoding will almost c= ertainly not help to get the option widely deployed.

 

Just to repeat myself, if I had to pick between the = current proposal in -11 and two different option codepoints, I would go for= the latter. We have >150 TCP option codepoints left. That resource is n= ot so scarce after all. I fail to see any real-world benefit of the proposal in -11 as compared to two separate = codepoints.

 

In a nutshell, I believe you should look for an opti= on design that can be processed by a stateless decoder. In other words, KIS= S. There are plenty of ways how to do that, and adding a byte is only one o= f them. I have already mentioned several other alternatives, and probably there are more (e.g., one could use a 2-b= it type field for each counter to identify it). All of them seem *simple= r* to me than the current proposal in -11.

 

To me, this idea in -11 *is broken* and this = should be fixed in -12.

 

Michael

 

 

Von: Bob Briscoe
Gesendet: Dienstag, 10. M=E4rz 2020 23:00
An: Scharf, Michae= l; tcpm IETF list
Cc: Richard Sche= ffenegger; Mirja Kuehlewind
Betreff: Re: [tcpm] New Version Notification for draft-ietf-tcpm-acc= urate-ecn-11.txt

 

Michael,

I agree extensibility is nice. And I'm open to a design with a 1 octet fiel= d immediately after the length field, for flags and the like. In fact, I en= couraged Ilpo to put his idea to the list (which he had put to be offlist).= But let's be disciplined about this if we're going to start down this road...

1) This is not the time for "it would be nice if". I want to go b= ack to your original email and ask you to be much more specific about the p= roblems envisaged. I agree the idea of switching field order based on the f= irst bit is unorthodox, but what is actually "not robust" about it? In what case(s) can it fail? Have you pro= ved these problems exist (whether paper proof or empirical)?

2) We have a very *inextensible* lack of TCP option space to deal with. And= we don't know what other important options might be invented in future. So= we shouldn't burn even a single byte unless we have good reason to. Extens= ibility is good. But it does burn space.

3) I haven't asked my co-authors, but I know that Mirja wanted the design t= o be as simple as possible, and now we're moving away from that.

If it ain't broken don't fix it.



Bob

On 09/03/2020 20:00, Scharf, Michael wrote:<= br>

With chair hat off, I really wonder if the solution = to encode the two different orders in the TCP Option is an example for good= and robust protocol engineering.

 

For instance, the current design makes it hard to de= code the field in a monitoring tool (such as Wireshark). Also, as far as I = understand, it does not allow to switch the encoding during a connection, w= hich limits flexibility. We almost certainly do not understand *now* all future use cases of this Stan= dard.

 

Unless I miss something, there would be several othe= r solutions:

 

First, IMHO, we have enough TCP option codepoints le= ft to spend two codepoints if there is a good reason for doing so. As compa= red to the current design proposal in -10/-11, spending two different optio= n kinds would look to me like *much* better protocol engineering.

 

Second, if the TCPM community insists in only one op= tion kind codepoint for whatever reason, IMHO one could add one =84sub-type= =93 byte to the option. The TCP Option field has to be multiples of 4 byte,= i.e., if a segment only contains a 11 byte AccECN TCP option, an additional NOP TCP option is needed for padding= , no? So, what downside have 12 bytes as compared to 11 bytes? For the shor= ter variants, the overhead of a =84sub-type=93 field increases, but it may = still be within reasonable limits. What do I miss?

 

Third, one could use different lengths for the diffe= rent orders, e.g., lenths 5/8/11 for type 0 and 6/9/12 for type 12. Is this= not possible?

 

In all these cases, the resulting protocol looks sim= pler and more robust to me. What prevents us from using the KISS principle?=

 

Michael

 

 

 

Von: Bob Briscoe
Gesendet: Freitag, 6. M=E4rz 2020 04:34
An: tcpm IETF list
Cc: Richard Sche= ffenegger; Mirja Kuehlewind
Betreff: Re: [tcpm] New Version Notification for draft-ietf-tcpm-acc= urate-ecn-11.txt

 

tcpm,

You will have seen draft-10 then draft-11 in quick succession, as already e= xplained.
The diffs from draft-09 to -10 were those that had built up since Jul'19. The diffs from draft-10 to -11 were solely those for the change from EXP tr= ack to STD track.
Draft-10 doesn't seem to display in the list of links to each version, but = you can manually write the URL.

The main technical changes in draft-10 were numerous - many will be recogni= zed from list discussion since Jul'19.
Particular thanks to Ilpo J=E4rvinen who identified many niggles (and their= solutions) while writing and testing a full Linux implementation (based on= Olivier Tilmans's, in turn based on Mirja's).

  • Allowed 2 different orders of the fields= in the AccECN Option
  • Reflect IP-ECN field of SYN/ACK onl= y on ACK of SYN/ACK, not also on first data packet
    • greatly simplifies implementation, esp w= ith TFO.
    • repeating on first data pa= cket was for reliable delivery, which is now achieved with ACE counter (see= next bullet)
  • Increment the ACE counter if CE on = SYN/ACK (but still not if CE on SYN)
    • Reliable delivery of feedback of CE on S= YN/ACK
  • Redefine 'first packet' as first to= arrive, not first in sequence in 2 cases:
    • Handshake reflection on the ACK of the S= YN/ACK
    • In the test for zeroing of A= CE
    • Reason: greatly simplifies imple= mentation
  • if ACE could have wrapped more than= once, SHOULD assume =93safest likely case=94
    not "conservatively assume" it did cycle
    • Reason: avoid unnecessary hit on perform= ance
  • More robustness (with flexibility) = in rules for when to include an AccECN Option
    • Change-triggered AccECN Option as SHOULD= , not MUST
    • SHOULD follow change-triggered AccE= CN Option with another (removes ambiguity if ACK thinning or loss)
    • when same counter continues to incr= ement, SHOULD consistently include it every n ACKs
    • Made rule about precedence of SACK = conditional (max 2 SACK blocks)
    • MAY exclude counters that have not = changed for the whole connection
  • Allowed an AccECN server not to imp= lement RFC3168 ECN (all clients still have to)
  • Precluded mixed capability negotiat= ion from either end
    • reduces freedom to choose SYN & SYN/= ACK fall-back strategies
    • to prevent cases where each end's o= utcome after handshake could be inconsistent (in reordering corner-cases)
  • Reserved the codepoint combination = used by the historic nonce case
  • Merged in a number of points from R= FC3168 that we hadn't covered
    • (a whole new subsection about obligation= s to do with ECN)
  • Explicit about checking "accep= table packets"
    • before counting their ECN markings or be= fore counting the ECN feedback they carry
  • Required retransmitted Fallback SYN= to use same ISN
    • allows servers to detect ECN downgrade S= YN attacks
  • Handled corner cases like In-window= SYN during TIME-WAIT



Bob

On 06/03/2020 02:24, internet-drafts@ietf.org wrote:

 
A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt
has been successfully submitted by Bob Briscoe and posted to the
IETF repository.
 
Name:           =
; draft-ietf-tcpm-accurate-ecn
Revision: 11
Title:           Mor=
e Accurate ECN Feedback in TCP
Document date:   2020-03-05
Group:           tcp=
m
Pages:           58<=
/pre>

URL:           =
 https://www.ietf.org/internet-drafts/draft-iet=
f-tcpm-accurate-ecn-11.txt


Status:         https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/

Htmlized:       https://t=
ools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11


Htmlized:       ht=
tps://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn


Diff:           https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-accu=
rate-ecn-11


 


Abstract:


   Explicit Congestion Notification (ECN) is a mechanism whe=
re network


   nodes can mark IP packets instead of dropping them to ind=
icate


   incipient congestion to the end-points.  Receivers w=
ith an ECN-


   capable transport protocol feed back this information to =
the sender.


   ECN is specified for TCP in such a way that only one feed=
back signal


   can be transmitted per Round-Trip Time (RTT).  Recen=
t new TCP


   mechanisms like Congestion Exposure (ConEx), Data Center =
TCP (DCTCP)


   or Low Latency Low Loss Scalable Throughput (L4S) need mo=
re accurate


   ECN feedback information whenever more than one marking i=
s received


   in one RTT.  This document specifies a scheme to pro=
vide more than


   one feedback signal per RTT in the TCP header.  Give=
n TCP header


   space is scarce, it allocates a reserved header bit, that=
 was


   previously used for the ECN-Nonce which has now been decl=
ared


   historic.  It also overloads the two existing ECN fl=
ags in the TCP


   header.  The resulting extra space is exploited to f=
eed back the IP-


   ECN field received during the 3-way handshake as well.&nb=
sp; Supplementary


   feedback information can optionally be provided in a new =
TCP option,


   which is never used on the TCP SYN.


 


            &nb=
sp;            =
            &nb=
sp;            =
            &nb=
sp;            =
       


 


 


Please note that it may take a couple of minutes from the time of subm=
ission


until the htmlized version and diff are available at tools.ietf.org.

 


The IETF Secretariat


 


 





-- 
________________________________________________________________
Bob Briscoe          =
;            &n=
bsp;        http://bobbriscoe.net/

 


--=20
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/
--_000_6EC6417807D9754DA64F3087E2E2E03E2D9D2380rznt8114rzntrzd_-- From nobody Tue Mar 10 16:37:21 2020 Return-Path: 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 7EB0E3A08AB for ; Tue, 10 Mar 2020 16:37:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham 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 i1ks9SH0UEG1 for ; Tue, 10 Mar 2020 16:37:16 -0700 (PDT) Received: from server.dnsblock1.com (server.dnsblock1.com [85.13.236.178]) (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 6C80B3A08AD for ; Tue, 10 Mar 2020 16:37:15 -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=VEXU8avdonUrljBQnnmar5Lhju/zBx2047OOUuZzbrY=; b=SD83DOSWjE/67CdInRFpgVSfZ ixe2y9btfBcHG1K7GWkxA39MNLXN1KOx9QaBFKoQFxAuavim4bpyQxxipP4jzLKfFRKc9cHt61kRM RhpkY2571DhjScnKKOI+BSlWFxnpCpDZWtUAhYHkgmS+10owmgwJf1xRv20ysMgbeSKGf5wgwMKvv czH6LcIO9L638HwhDjJ2agF24vT6XswDoLe+tPSafjvBBjOmb6CP/0r2MtrNmXgGtFOOM7bsaMV1r vO32yS/x6ODrZf6oO/soeA4HP/F8T4q6bi9yGhNXxnMThKnS28zE+4dlI2SfBNfcnOPm+H5yQ3Sgy WZGGkZycw==; Received: from [31.185.128.125] (port=47920 helo=[192.168.0.6]) by server.dnsblock1.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.92) (envelope-from ) id 1jBoQx-0005kv-2w; Tue, 10 Mar 2020 23:37:12 +0000 To: =?UTF-8?Q?Ilpo_J=c3=a4rvinen?= Cc: "Scharf, Michael" , tcpm IETF list , Richard Scheffenegger , Mirja Kuehlewind References: <6EC6417807D9754DA64F3087E2E2E03E2D9CCC8D@rznt8114.rznt.rzdir.fht-esslingen.de> From: Bob Briscoe Message-ID: <728285ba-0677-25f3-844f-d8f2f9781df1@bobbriscoe.net> Date: Tue, 10 Mar 2020 23:37:10 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <6EC6417807D9754DA64F3087E2E2E03E2D9CCC8D@rznt8114.rznt.rzdir.fht-esslingen.de> Content-Type: multipart/alternative; boundary="------------4ECD145BA5EA48E631CB04E6" Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.dnsblock1.com 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: server.dnsblock1.com: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: server.dnsblock1.com: in@bobbriscoe.net Archived-At: Subject: Re: [tcpm] New Version Notification fordraft-ietf-tcpm-accurate-ecn-11.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2020 23:37:20 -0000 This is a multi-part message in MIME format. --------------4ECD145BA5EA48E631CB04E6 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Ilpo, Can you please describe the idea more fully? I cannot understand it from the description, although I thought I understood it when you explained it to me (off list). Here's my understanding of the problem, for the benefit of the list (Ilpo and I have been discussing this off list, and I don't think the list will understand without this): * This is all in the context of a Receiver that is sending AccECN TCP Options. It doesn't have to send these options at all but, if it does, they complement and help disambiguate the 3-bit ACE counter in the main TCP header (which is always used). * Further context: Even if a receiver is sending the AccECN Option, it can choose to sometimes send ACKs without an AccECN Option, and the sender can then assume that all the bytes ACK'd had the same ECN marking (perhaps wrongly if there have been ACK losses). * The proposed rules for when to use the AccECN Option are here: https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11#section-3.2.3.3 The first rule is: Change-Triggered ACKs: If an arriving packet increments a different byte counter to that incremented by the previous packet, the Data Receiver SHOULD immediately send an ACK with an AccECN Option, without waiting for the next delayed ACK [...]. Even though this bullet is stated as a "SHOULD", it is important for a transition to immediately trigger an ACK if at all possible, ... Originally Ilpo thought this made the sender implementation too difficult, even in very common delayed ACK cases, e.g.:     ECT1 ACK#1 (ECT1 counter)     ECT1     CE ACK#2 (ECT1 & CE counters)     ECT1 ACK#3 (ECT1 counter)     ECT1     ECT1 ACK#4 (no AccECN Option)     ECT1     ECT1 ACK#5 (no AccECN Option) ... In ACK#2, both ECT1 and CE counters have incremented, so how does the sender know which counter triggered this ACK? it needs to know this to guess which counter to increment if it gets an ACK without an AccECN Option. My answer: the sender can infer that CE triggered the second ACK shown, because in the previous ACK, only ECT1 was incrementing. Ilpo was concerned that, in the case where ACK#3 is lost or thinned, the sender could assume from the subsequent lack of any AccECN Options that more and more CE was arriving, when actually more and more ECT1 was arriving. I agreed, but my argument was that there are more "SHOULD" rules for the receiver, such as: * It SHOULD always include an AccECN Option if the r.ceb counter is incrementing and it MAY include an AccECN Option if r.ec0b or r.ec1b is incrementing So, certainly it is possible that there will be ambiguous occasions when there is no AccECN Option. However, the idea is not to omit an AccECN option at all unless there is no space (e.g. because some other option takes priority). So these cases where assumptions have to be made are not intended to be routine - the rules are only written as SHOULDs in order to give the receiver flexibility if it needs the space to send other options. it is not expected to break all the SHOULD rules all the time. Nonetheless, it did make sense to add this rule, at Ilpo's suggestion: * It SHOULD include a counter that has continued to increment on the next scheduled ACK following a change-triggered ACK; For example, ACks #3 and #5 below are due to this rule:     ECT1 ACK#1 (ECT1 counter)     ECT1     CE ACK#2 (ECT1 & CE counters)     CE     CE ACK#3 (CE counter)     ECT1 ACK#4 (ECT1 counter)     ECT1     ECT1 ACK#5 (ECT1 counter)     ECT1     ECT1 ACK#6 (no AccECN Option) ... But I pointed out that, of course, this doesn't fully solve the problem, because this second AccECN Option could be lost, just as easily as the first (obviously a lower probability that they are both lost, but this could be common with heavy ACK thinning). It was at this point that Ilpo suggested that a 2-bit field in a 1-byte option could specify which was the last counter to have changed. However, now I re-read both Ilpo's offlist and the onlist emails, I'm not sure I understand the rules of the scheme, whereas I thought I did. Ilpo, can you write a really precise and full spec of your proposal, stating all assumptions? Are ACKs without any AccECN Option allowed? Or are you saying this 1 byte option MUST always be included? Bob On 10/03/2020 06:38, Scharf, Michael wrote: > > Yep, if one byte was added, there would probably be remaining bits left. > > RFC 5218 Section 2.2.1: „Protocols that are extensible are more likely > to be wildly successful in terms of being used for purposes outside > their original design.“ > > Michael > > *Von: *Ilpo Järvinen > *Gesendet: *Montag, 9. März 2020 23:32 > *An: *Scharf, Michael > *Cc: *Bob Briscoe ; tcpm IETF list > ; Richard Scheffenegger > ; Mirja Kuehlewind > > *Betreff: *Re: [tcpm] New Version Notification > fordraft-ietf-tcpm-accurate-ecn-11.txt > > Hi Michael, > > I agree with out  that it's somewhat painful to deal with the marker bit > > at the beginning for the option field order. > > Another challenge I've come across is to correctly reproduce the > > Accurate ECN state at the sender which would benefit from having > > a few extra bits available. > > It currently requires guessing at every option arrival what the receiver > > is doing next (what counter it will be increasing next) which is not very > > robust to ACK losses. On change-triggered ACK, two byte counters are > > increasing rather than one. ACK losses will easily confuse approach that > > just assumes back-and-forth transitions. Thus, I suggested sending one > > extra option after the change-triggered ACK to allow sender to see > > unambiguous counter delta between the change-triggered ACK and that > > next ACK (it is now in -11). > > To allow the sender to immediately sync with the receiver on any > > AccECN option arrival, it would make sense to encode that information > > into the option itself. It would need 2 extra bits into the option > > so adding that one byte there would help. ...It might be possible to > > combine it to field order and define that the first encoded field is > > the currently increasing counter (the order of the remaining two fields > > still need to be addressed somehow). > > -- > >  i. > > On Mon, 9 Mar 2020, Michael Scharf wrote: > > > > > > With chair hat off, I really wonder if the solution to encode the two > > > different orders in the TCP Option is an example for good and robust > > > protocol engineering. > > > > > > > > > > > > For instance, the current design makes it hard to decode the field in a > > > monitoring tool (such as Wireshark). Also, as far as I understand, > it does > > > not allow to switch the encoding during a connection, which limits > > > flexibility. We almost certainly do not understand *now* all future use > > > cases of this Standard. > > > > > > > > > > > > Unless I miss something, there would be several other solutions: > > > > > > > > > > > > First, IMHO, we have enough TCP option codepoints left to spend two > > > codepoints if there is a good reason for doing so. As compared to the > > > current design proposal in -10/-11, spending two different option kinds > > > would look to me like *much* better protocol engineering. > > > > > > > > > > > > Second, if the TCPM community insists in only one option kind > codepoint for > > > whatever reason, IMHO one could add one „sub-type“ byte to the > option. The > > > TCP Option field has to be multiples of 4 byte, i.e., if a segment only > > > contains a 11 byte AccECN TCP option, an additional NOP TCP option > is needed > > > for padding, no? So, what downside have 12 bytes as compared to 11 > bytes? > > > For the shorter variants, the overhead of a „sub-type“ field > increases, but > > > it may still be within reasonable limits. What do I miss? > > > > > > > > > > > > Third, one could use different lengths for the different orders, e.g., > > > lenths 5/8/11 for type 0 and 6/9/12 for type 12. Is this not possible? > > > > > > > > > > > > In all these cases, the resulting protocol looks simpler and more > robust to > > > me. What prevents us from using the KISS principle? > > > > > > > > > > > > Michael > > > > > > > > > > > > > > > > > > > > > > > > Von: Bob Briscoe > > > Gesendet: Freitag, 6. März 2020 04:34 > > > An: tcpm IETF list > > > Cc: Richard Scheffenegger; Mirja Kuehlewind > > > Betreff: Re: [tcpm] New Version Notification for > > > draft-ietf-tcpm-accurate-ecn-11.txt > > > > > > > > > > > > tcpm, > > > > > > You will have seen draft-10 then draft-11 in quick succession, as > already > > > explained. > > > The diffs from draft-09 to -10 were those that had built up since > Jul'19. > > > The diffs from draft-10 to -11 were solely those for the change from EXP > > > track to STD track. > > > Draft-10 doesn't seem to display in the list of links to each > version, but > > > you can manually write the URL. > > > > > > The main technical changes in draft-10 were numerous - many will be > > > recognized from list discussion since Jul'19. > > > Particular thanks to Ilpo Järvinen who identified many niggles (and > their > > > solutions) while writing and testing a full Linux implementation > (based on > > > Olivier Tilmans's, in turn based on Mirja's). > > > > > >  *  Allowed 2 different orders of the fields in the AccECN Option > > >  *  Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also on > > >     first data packet > > >      +  greatly simplifies implementation, esp with TFO. > > >      +  repeating on first data packet was for reliable delivery, > which is > > >         now achieved with ACE counter (see next bullet) > > >  *  Increment the ACE counter if CE on SYN/ACK (but still not if CE > on SYN) > > >      +  Reliable delivery of feedback of CE on SYN/ACK > > >  *  Redefine 'first packet' as first to arrive, not first in > sequence in 2 > > >     cases: > > >      +  Handshake reflection on the ACK of the SYN/ACK > > >      +  In the test for zeroing of ACE > > >      +  Reason: greatly simplifies implementation > > >  *  if ACE could have wrapped more than once, SHOULD assume “safest > likely > > >     case” > > >     not "conservatively assume" it did cycle > > >      +  Reason: avoid unnecessary hit on performance > > >  *  More robustness (with flexibility) in rules for when to include an > > >     AccECN Option > > >      +  Change-triggered AccECN Option as SHOULD, not MUST > > >      +  SHOULD follow change-triggered AccECN Option with another > (removes > > >         ambiguity if ACK thinning or loss) > > >      +  when same counter continues to increment, SHOULD consistently > > >         include it every n ACKs > > >      +  Made rule about precedence of SACK conditional (max 2 SACK > blocks) > > >      +  MAY exclude counters that have not changed for the whole > connection > > >  *  Allowed an AccECN server not to implement RFC3168 ECN (all > clients still > > >     have to) > > >  *  Precluded mixed capability negotiation from either end > > >      +  reduces freedom to choose SYN & SYN/ACK fall-back strategies > > >      +  to prevent cases where each end's outcome after handshake > could be > > >         inconsistent (in reordering corner-cases) > > >  *  Reserved the codepoint combination used by the historic nonce case > > >  *  Merged in a number of points from RFC3168 that we hadn't covered > > >      +  (a whole new subsection about obligations to do with ECN) > > >  *  Explicit about checking "acceptable packets" > > >      +  before counting their ECN markings or before counting the ECN > > >         feedback they carry > > >  *  Required retransmitted Fallback SYN to use same ISN > > >      +  allows servers to detect ECN downgrade SYN attacks > > >  *  Handled corner cases like In-window SYN during TIME-WAIT > > > > > > > > > > > > Bob > > > > > > On 06/03/2020 02:24, internet-drafts@ietf.org wrote: > > > > > > > > > > > > A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt > > > > > > has been successfully submitted by Bob Briscoe and posted to the > > > > > > IETF repository. > > > > > > > > > > > > Name: draft-ietf-tcpm-accurate-ecn > > > > > > Revision: 11 > > > > > > Title:           More Accurate ECN Feedback in TCP > > > > > > Document date:   2020-03-05 > > > > > > Group:           tcpm > > > > > > Pages:           58 > > > > > > URL: https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accurat > > > e-ecn-11.txt > > > > > > Status: https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ec > > > n/ > > > > > > Htmlized: https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11 > > > > > > Htmlized: https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accura > > > te-ecn > > > > > > Diff: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-e > > > cn-11 > > > > > > > > > > > > Abstract: > > > > > >    Explicit Congestion Notification (ECN) is a mechanism where network > > > > > >    nodes can mark IP packets instead of dropping them to indicate > > > > > >    incipient congestion to the end-points.  Receivers with an ECN- > > > > > >    capable transport protocol feed back this information to the sender. > > > > > >    ECN is specified for TCP in such a way that only one feedback signal > > > > > >    can be transmitted per Round-Trip Time (RTT).  Recent new TCP > > > > > >    mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP) > > > > > >    or Low Latency Low Loss Scalable Throughput (L4S) need more accurate > > > > > >    ECN feedback information whenever more than one marking is received > > > > > >    in one RTT.  This document specifies a scheme to provide more than > > > > > >    one feedback signal per RTT in the TCP header.  Given TCP header > > > > > >    space is scarce, it allocates a reserved header bit, that was > > > > > >    previously used for the ECN-Nonce which has now been declared > > > > > >    historic.  It also overloads the two existing ECN flags in the TCP > > > > > >    header.  The resulting extra space is exploited to feed back the IP- > > > > > >    ECN field received during the 3-way handshake as well.  Supplementary > > > > > >    feedback information can optionally be provided in a new TCP option, > > > > > >    which is never used on the TCP SYN. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Please note that it may take a couple of minutes from the time of > submission > > > > > > until the htmlized version and diff are available at tools.ietf.org. > > > > > > > > > > > > The IETF Secretariat > > > > > > > > > > > > > > > > > > > > > > > > > -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ --------------4ECD145BA5EA48E631CB04E6 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit Ilpo,

Can you please describe the idea more fully? I cannot understand it from the description, although I thought I understood it when you explained it to me (off list).

Here's my understanding of the problem, for the benefit of the list (Ilpo and I have been discussing this off list, and I don't think the list will understand without this):

* This is all in the context of a Receiver that is sending AccECN TCP Options. It doesn't have to send these options at all but, if it does, they complement and help disambiguate the 3-bit ACE counter in the main TCP header (which is always used).
* Further context: Even if a receiver is sending the AccECN Option, it can choose to sometimes send ACKs without an AccECN Option, and the sender can then assume that all the bytes ACK'd had the same ECN marking (perhaps wrongly if there have been ACK losses).
* The proposed rules for when to use the AccECN Option are here:
https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11#section-3.2.3.3

The first rule is:
   Change-Triggered ACKs:  If an arriving packet increments a different
      byte counter to that incremented by the previous packet, the Data
      Receiver SHOULD immediately send an ACK with an AccECN Option,
      without waiting for the next delayed ACK [...].

      Even though this bullet is stated as a "SHOULD", it is important
      for a transition to immediately trigger an ACK if at all possible,
      ...
Originally Ilpo thought this made the sender implementation too difficult, even in very common delayed ACK cases, e.g.:

    ECT1
ACK#1 (ECT1 counter)
    ECT1
    CE
ACK#2 (ECT1 & CE counters)
    ECT1
ACK#3 (ECT1 counter)
    ECT1
    ECT1
ACK#4 (no AccECN Option)
    ECT1
    ECT1
ACK#5 (no AccECN Option)
...

In ACK#2, both ECT1 and CE counters have incremented, so how does the sender know which counter triggered this ACK? it needs to know this to guess which counter to increment if it gets an ACK without an AccECN Option.
My answer: the sender can infer that CE triggered the second ACK shown, because in the previous ACK, only ECT1 was incrementing.

Ilpo was concerned that, in the case where ACK#3 is lost or thinned, the sender could assume from the subsequent lack of any AccECN Options that more and more CE was arriving, when actually more and more ECT1 was arriving.

I agreed, but my argument was that there are more "SHOULD" rules for the receiver, such as:
      *  It SHOULD always include an AccECN Option if the r.ceb counter
         is incrementing and it MAY include an AccECN Option if r.ec0b
         or r.ec1b is incrementing
So, certainly it is possible that there will be ambiguous occasions when there is no AccECN Option. However, the idea is not to omit an AccECN option at all unless there is no space (e.g. because some other option takes priority). So these cases where assumptions have to be made are not intended to be routine - the rules are only written as SHOULDs in order to give the receiver flexibility if it needs the space to send other options. it is not expected to break all the SHOULD rules all the time.

Nonetheless, it did make sense to add this rule, at Ilpo's suggestion:
      *  It SHOULD include a counter that has continued to increment on
         the next scheduled ACK following a change-triggered ACK;
For example, ACks #3 and #5 below are due to this rule:

    ECT1
ACK#1 (ECT1 counter)
    ECT1
    CE
ACK#2 (ECT1 & CE counters)
    CE
    CE
ACK#3 (CE counter)
    ECT1
ACK#4 (ECT1 counter)
    ECT1
    ECT1
ACK#5 (ECT1 counter)
    ECT1
    ECT1
ACK#6 (no AccECN Option)
...


But I pointed out that, of course, this doesn't fully solve the problem, because this second AccECN Option could be lost, just as easily as the first (obviously a lower probability that they are both lost, but this could be common with heavy ACK thinning).

It was at this point that Ilpo suggested that a 2-bit field in a 1-byte option could specify which was the last counter to have changed.

However, now I re-read both Ilpo's offlist and the onlist emails, I'm not sure I understand the rules of the scheme, whereas I thought I did.


Ilpo, can you write a really precise and full spec of your proposal, stating all assumptions?
Are ACKs without any AccECN Option allowed? Or are you saying this 1 byte option MUST always be included?



Bob

On 10/03/2020 06:38, Scharf, Michael wrote:

Yep, if one byte was added, there would probably be remaining bits left.

 

RFC 5218 Section 2.2.1: „Protocols that are extensible are more likely to be wildly successful in terms of being used for purposes outside their original design.“

 

Michael

 

Von: Ilpo Järvinen
Gesendet: Montag, 9. März 2020 23:32
An: Scharf, Michael
Cc: Bob Briscoe; tcpm IETF list; Richard Scheffenegger; Mirja Kuehlewind
Betreff: Re: [tcpm] New Version Notification fordraft-ietf-tcpm-accurate-ecn-11.txt

 

Hi Michael,

 

I agree with out  that it's somewhat painful to deal with the marker bit

at the beginning for the option field order.

 

Another challenge I've come across is to correctly reproduce the

Accurate ECN state at the sender which would benefit from having

a few extra bits available.

 

It currently requires guessing at every option arrival what the receiver

is doing next (what counter it will be increasing next) which is not very

robust to ACK losses. On change-triggered ACK, two byte counters are

increasing rather than one. ACK losses will easily confuse approach that

just assumes back-and-forth transitions. Thus, I suggested sending one

extra option after the change-triggered ACK to allow sender to see

unambiguous counter delta between the change-triggered ACK and that

next ACK (it is now in -11).

 

To allow the sender to immediately sync with the receiver on any

AccECN option arrival, it would make sense to encode that information

into the option itself. It would need 2 extra bits into the option

so adding that one byte there would help. ...It might be possible to

combine it to field order and define that the first encoded field is

the currently increasing counter (the order of the remaining two fields

still need to be addressed somehow).

 

--

 i.

 

On Mon, 9 Mar 2020, Michael Scharf wrote:

 

>

> With chair hat off, I really wonder if the solution to encode the two

> different orders in the TCP Option is an example for good and robust

> protocol engineering.

>

>  

>

> For instance, the current design makes it hard to decode the field in a

> monitoring tool (such as Wireshark). Also, as far as I understand, it does

> not allow to switch the encoding during a connection, which limits

> flexibility. We almost certainly do not understand *now* all future use

> cases of this Standard.

>

>  

>

> Unless I miss something, there would be several other solutions:

>

>  

>

> First, IMHO, we have enough TCP option codepoints left to spend two

> codepoints if there is a good reason for doing so. As compared to the

> current design proposal in -10/-11, spending two different option kinds

> would look to me like *much* better protocol engineering.

>

>  

>

> Second, if the TCPM community insists in only one option kind codepoint for

> whatever reason, IMHO one could add one „sub-type“ byte to the option. The

> TCP Option field has to be multiples of 4 byte, i.e., if a segment only

> contains a 11 byte AccECN TCP option, an additional NOP TCP option is needed

> for padding, no? So, what downside have 12 bytes as compared to 11 bytes?

> For the shorter variants, the overhead of a „sub-type“ field increases, but

> it may still be within reasonable limits. What do I miss?

>

>  

>

> Third, one could use different lengths for the different orders, e.g.,

> lenths 5/8/11 for type 0 and 6/9/12 for type 12. Is this not possible?

>

>  

>

> In all these cases, the resulting protocol looks simpler and more robust to

> me. What prevents us from using the KISS principle?

>

>  

>

> Michael

>

>  

>

>  

>

>  

>

> Von: Bob Briscoe

> Gesendet: Freitag, 6. März 2020 04:34

> An: tcpm IETF list

> Cc: Richard Scheffenegger; Mirja Kuehlewind

> Betreff: Re: [tcpm] New Version Notification for

> draft-ietf-tcpm-accurate-ecn-11.txt

>

>  

>

> tcpm,

>

> You will have seen draft-10 then draft-11 in quick succession, as already

> explained.

> The diffs from draft-09 to -10 were those that had built up since Jul'19.

> The diffs from draft-10 to -11 were solely those for the change from EXP

> track to STD track.

> Draft-10 doesn't seem to display in the list of links to each version, but

> you can manually write the URL.

>

> The main technical changes in draft-10 were numerous - many will be

> recognized from list discussion since Jul'19.

> Particular thanks to Ilpo Järvinen who identified many niggles (and their

> solutions) while writing and testing a full Linux implementation (based on

> Olivier Tilmans's, in turn based on Mirja's).

>

>  *  Allowed 2 different orders of the fields in the AccECN Option

>  *  Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also on

>     first data packet

>      +  greatly simplifies implementation, esp with TFO.

>      +  repeating on first data packet was for reliable delivery, which is

>         now achieved with ACE counter (see next bullet)

>  *  Increment the ACE counter if CE on SYN/ACK (but still not if CE on SYN)

>      +  Reliable delivery of feedback of CE on SYN/ACK

>  *  Redefine 'first packet' as first to arrive, not first in sequence in 2

>     cases:

>      +  Handshake reflection on the ACK of the SYN/ACK

>      +  In the test for zeroing of ACE

>      +  Reason: greatly simplifies implementation

>  *  if ACE could have wrapped more than once, SHOULD assume “safest likely

>     case”

>     not "conservatively assume" it did cycle

>      +  Reason: avoid unnecessary hit on performance

>  *  More robustness (with flexibility) in rules for when to include an

>     AccECN Option

>      +  Change-triggered AccECN Option as SHOULD, not MUST

>      +  SHOULD follow change-triggered AccECN Option with another (removes

>         ambiguity if ACK thinning or loss)

>      +  when same counter continues to increment, SHOULD consistently

>         include it every n ACKs

>      +  Made rule about precedence of SACK conditional (max 2 SACK blocks)

>      +  MAY exclude counters that have not changed for the whole connection

>  *  Allowed an AccECN server not to implement RFC3168 ECN (all clients still

>     have to)

>  *  Precluded mixed capability negotiation from either end

>      +  reduces freedom to choose SYN & SYN/ACK fall-back strategies

>      +  to prevent cases where each end's outcome after handshake could be

>         inconsistent (in reordering corner-cases)

>  *  Reserved the codepoint combination used by the historic nonce case

>  *  Merged in a number of points from RFC3168 that we hadn't covered

>      +  (a whole new subsection about obligations to do with ECN)

>  *  Explicit about checking "acceptable packets"

>      +  before counting their ECN markings or before counting the ECN

>         feedback they carry

>  *  Required retransmitted Fallback SYN to use same ISN

>      +  allows servers to detect ECN downgrade SYN attacks

>  *  Handled corner cases like In-window SYN during TIME-WAIT

>

>

>

> Bob

>

> On 06/03/2020 02:24, internet-drafts@ietf.org wrote:

>

>  

>

> A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt

>

> has been successfully submitted by Bob Briscoe and posted to the

>

> IETF repository.

>

>  

>

> Name:            draft-ietf-tcpm-accurate-ecn

>

> Revision: 11

>

> Title:           More Accurate ECN Feedback in TCP

>

> Document date:   2020-03-05

>

> Group:           tcpm

>

> Pages:           58

>

> URL:            https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accurat

> e-ecn-11.txt

>

> Status:         https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ec

> n/

>

> Htmlized:       https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11

>

> Htmlized:       https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accura

> te-ecn

>

> Diff:           https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-e

> cn-11

>

>  

>

> Abstract:

>

>    Explicit Congestion Notification (ECN) is a mechanism where network

>

>    nodes can mark IP packets instead of dropping them to indicate

>

>    incipient congestion to the end-points.  Receivers with an ECN-

>

>    capable transport protocol feed back this information to the sender.

>

>    ECN is specified for TCP in such a way that only one feedback signal

>

>    can be transmitted per Round-Trip Time (RTT).  Recent new TCP

>

>    mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP)

>

>    or Low Latency Low Loss Scalable Throughput (L4S) need more accurate

>

>    ECN feedback information whenever more than one marking is received

>

>    in one RTT.  This document specifies a scheme to provide more than

>

>    one feedback signal per RTT in the TCP header.  Given TCP header

>

>    space is scarce, it allocates a reserved header bit, that was

>

>    previously used for the ECN-Nonce which has now been declared

>

>    historic.  It also overloads the two existing ECN flags in the TCP

>

>    header.  The resulting extra space is exploited to feed back the IP-

>

>    ECN field received during the 3-way handshake as well.  Supplementary

>

>    feedback information can optionally be provided in a new TCP option,

>

>    which is never used on the TCP SYN.

>

>  

>

>                                                                             

>       

>

>  

>

>  

>

> Please note that it may take a couple of minutes from the time of submission

>

> until the htmlized version and diff are available at tools.ietf.org.

>

>  

>

> The IETF Secretariat

>

>  

>

>  

>

>

>

> 

 


-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/
--------------4ECD145BA5EA48E631CB04E6-- From nobody Wed Mar 11 05:38:07 2020 Return-Path: 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 11ADC3A1841 for ; Wed, 11 Mar 2020 05:38:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cs.helsinki.fi 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 mo3Rlr4IXs01 for ; Wed, 11 Mar 2020 05:38:02 -0700 (PDT) Received: from script.cs.helsinki.fi (script.cs.helsinki.fi [128.214.11.1]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E123E3A183F for ; Wed, 11 Mar 2020 05:38:01 -0700 (PDT) X-DKIM: Courier DKIM Filter v0.50+pk-2017-10-25 mail.cs.helsinki.fi Wed, 11 Mar 2020 14:37:52 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.helsinki.fi; h=date:from:to:cc:subject:in-reply-to:message-id:references :mime-version:content-type; s=dkim20130528; bh=mfZZumhdmk67TdFOp Ki7NT8lms67rxCjdEfIQFmfOHc=; b=G4wcKQ0tQGXnEEXE38VhtXfcNTvfN/hRO +RgJA/IhGDbUuPzN5P8n+cvgBd0W8/AGLpMFMbZ1XnYh2eDYzaKLwFPWPcVl7LVf iNU7gNW68WRPa9PdO5b/9MHV5ea6/F2U3SOz1D27G7YXMvV67ACLuOeg102LUrud SxhRCCg4T4= Received: from whs-18.cs.helsinki.fi (whs-18.cs.helsinki.fi [128.214.166.46]) (TLS: TLSv1/SSLv3,256bits,AES256-GCM-SHA384) by mail.cs.helsinki.fi with ESMTPS; Wed, 11 Mar 2020 14:37:52 +0200 id 00000000005A275D.000000005E68DBA0.00001C06 Date: Wed, 11 Mar 2020 14:37:52 +0200 (EET) From: "=?ISO-8859-15?Q?Ilpo_J=E4rvinen?=" X-X-Sender: ijjarvin@whs-18.cs.helsinki.fi To: Bob Briscoe cc: Michael Scharf , tcpm IETF list , Richard Scheffenegger , Mirja Kuehlewind In-Reply-To: <728285ba-0677-25f3-844f-d8f2f9781df1@bobbriscoe.net> Message-ID: References: <6EC6417807D9754DA64F3087E2E2E03E2D9CCC8D@rznt8114.rznt.rzdir.fht-esslingen.de> <728285ba-0677-25f3-844f-d8f2f9781df1@bobbriscoe.net> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=_script-7198-1583930272-0001-2" Archived-At: Subject: Re: [tcpm] New Version Notificationfordraft-ietf-tcpm-accurate-ecn-11.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Mar 2020 12:38:05 -0000 This is a MIME-formatted message. If you see this text it means that your E-mail software does not support MIME-formatted messages. --=_script-7198-1583930272-0001-2 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi all, Here's the option format with the extra octet: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Kind =3D TBD1 | Length =3D 11 | Reserved |Cnt| EE0B field | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | EE0B (cont'd) | ECEB field | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | EE1B field | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Cnt indicates the counter (IP-ECN field value) from the last received packet. The receiver incremented this counter with this ACK. The counter value might have not increased if the payload length was zero but a subsequent packet would increase the same counter if IP-ECN field remains the same. The octet containing Cnt MUST be included when any byte counter is included. It MAY be left out otherwise. If an AccECN option without bytes=20 counters is increased but Cnt value is included and changed, the sender=20 switches to the indicated counter (but cannot sync counters which may be=20 be somewhat off in case of ACK losses). If the Option is sent in a change-triggered ACK, the Cnt field will differ from the previously sent value. For other ACKs the option, Cnt is=20 the same as previously. As a new AccECN options should be sent in the next change-triggered ACK, the IP-ECN field edges are captured. Now, even if there were any number of ACK losses prior to receiving such an AccECN option, the sender can immediately sync with the receiver'= s=20 state and knows what counter the receiver will be increasing, no need to=20 guess that based on any byte counter delta (on the next ACK if it=20 doesn't contain AccECN option). The main point with Cnt is to help the sender to do more accurate=20 estimation in the cases where ACKs without AccECN option arrive. As such estimation needs only run on ACKs, the Cnt information does not require sending extra ACKs at any point of time. In fact, the change-triggered ACKs requirement could even be relaxed with it because together the byte counters and Cnt sync the AccECN state such that knowing the exact point of the IP-ECN field edge is no longer as necessary as earlier. If Cnt is zero, the receiver got a packet with non-ECT and no counter is increasing as a result of the ACK or subsequent ACKs until next the AccECN option arrival. Since the byte counter indicated with Cnt field is typically increasing, it would be possible to make the Cnt value dual purpose and use it to indicate which counter appears first in the Option (if there are any counters in the first place). This would partically resolve Michael's concern about the field ordering. Other counters that have changed since=20 the receiver sent last AccECN option should be included after the first field (in some order, specifying the order of the remaining fields is beyond this Cnt proposal). -- i. On Tue, 10 Mar 2020, Bob Briscoe wrote: > Ilpo, >=20 > Can you please describe the idea more fully? I cannot understand it fro= m the > description, although I thought I understood it when you explained it t= o me > (off list). >=20 > Here's my understanding of the problem, for the benefit of the list (Il= po > and I have been discussing this off list, and I don't think the list wi= ll > understand without this): >=20 > * This is all in the context of a Receiver that is sending AccECN TCP > Options. It doesn't have to send these options at all but, if it does, = they > complement and help disambiguate the 3-bit ACE counter in the main TCP > header (which is always used). > * Further context: Even if a receiver is sending the AccECN Option, it = can > choose to sometimes send ACKs without an AccECN Option, and the sender = can > then assume that all the bytes ACK'd had the same ECN marking (perhaps > wrongly if there have been ACK losses). > * The proposed rules for when to use the AccECN Option are here: > https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11#section-3.2= .3.3 >=20 >=20 > The first rule is: >=20 > Change-Triggered ACKs: If an arriving packet increments a different > byte counter to that incremented by the previous packet, the Data > Receiver SHOULD immediately send an ACK with an AccECN Option, > without waiting for the next delayed ACK [...]. >=20 > Even though this bullet is stated as a "SHOULD", it is important > for a transition to immediately trigger an ACK if at all possible= , > ... > Originally Ilpo thought this made the sender implementation too difficu= lt, > even in very common delayed ACK cases, e.g.: >=20 > =C2=A0=C2=A0=C2=A0 ECT1 > ACK#1 (ECT1 counter) > =C2=A0=C2=A0=C2=A0 ECT1 > =C2=A0=C2=A0=C2=A0 CE > ACK#2 (ECT1 & CE counters) > =C2=A0=C2=A0=C2=A0 ECT1 > ACK#3 (ECT1 counter) > =C2=A0=C2=A0=C2=A0 ECT1 > =C2=A0=C2=A0=C2=A0 ECT1 > ACK#4 (no AccECN Option) > =C2=A0=C2=A0=C2=A0 ECT1 > =C2=A0=C2=A0=C2=A0 ECT1 > ACK#5 (no AccECN Option) > ... >=20 > In ACK#2, both ECT1 and CE counters have incremented, so how does the s= ender > know which counter triggered this ACK? it needs to know this to guess w= hich > counter to increment if it gets an ACK without an AccECN Option. > My answer: the sender can infer that CE triggered the second ACK shown, > because in the previous ACK, only ECT1 was incrementing. >=20 > Ilpo was concerned that, in the case where ACK#3 is lost or thinned, th= e > sender could assume from the subsequent lack of any AccECN Options that = more > and more CE was arriving, when actually more and more ECT1 was arriving= . >=20 > I agreed, but my argument was that there are more "SHOULD" rules for th= e > receiver, such as: >=20 > * It SHOULD always include an AccECN Option if the r.ceb counter > is incrementing and it MAY include an AccECN Option if r.ec0b > or r.ec1b is incrementing > So, certainly it is possible that there will be ambiguous occasions whe= n > there is no AccECN Option. However, the idea is not to omit an AccECN o= ption > at all unless there is no space (e.g. because some other option takes > priority). So these cases where assumptions have to be made are not int= ended > to be routine - the rules are only written as SHOULDs in order to give = the > receiver flexibility if it needs the space to send other options. it is = not > expected to break all the SHOULD rules all the time. >=20 > Nonetheless, it did make sense to add this rule, at Ilpo's suggestion: >=20 > * It SHOULD include a counter that has continued to increment on > the next scheduled ACK following a change-triggered ACK; > For example, ACks #3 and #5 below are due to this rule: >=20 > =C2=A0=C2=A0=C2=A0 ECT1 > ACK#1 (ECT1 counter) > =C2=A0=C2=A0=C2=A0 ECT1 > =C2=A0=C2=A0=C2=A0 CE > ACK#2 (ECT1 & CE counters) > =C2=A0=C2=A0=C2=A0 CE > =C2=A0=C2=A0=C2=A0 CE > ACK#3 (CE counter) > =C2=A0=C2=A0=C2=A0 ECT1 > ACK#4 (ECT1 counter) > =C2=A0=C2=A0=C2=A0 ECT1 > =C2=A0=C2=A0=C2=A0 ECT1 > ACK#5 (ECT1 counter) > =C2=A0=C2=A0=C2=A0 ECT1 > =C2=A0=C2=A0=C2=A0 ECT1 > ACK#6 (no AccECN Option) > ... >=20 >=20 > But I pointed out that, of course, this doesn't fully solve the problem= , > because this second AccECN Option could be lost, just as easily as the = first > (obviously a lower probability that they are both lost, but this could = be > common with heavy ACK thinning). >=20 > It was at this point that Ilpo suggested that a 2-bit field in a 1-byte > option could specify which was the last counter to have changed. >=20 > However, now I re-read both Ilpo's offlist and the onlist emails, I'm n= ot > sure I understand the rules of the scheme, whereas I thought I did. >=20 >=20 > Ilpo, can you write a really precise and full spec of your proposal, st= ating > all assumptions? > Are ACKs without any AccECN Option allowed? Or are you saying this 1 by= te > option MUST always be included? >=20 >=20 >=20 > Bob >=20 > On 10/03/2020 06:38, Scharf, Michael wrote: >=20 > Yep, if one byte was added, there would probably be remaining > bits left. >=20 > =C2=A0 >=20 > RFC 5218 Section 2.2.1: =E2=80=9EProtocols that are extensible ar= e more > likely to be wildly successful in terms of being used for > purposes outside their original design.=E2=80=9C >=20 > =C2=A0 >=20 > Michael >=20 > =C2=A0 >=20 > Von: Ilpo J=C3=A4rvinen > Gesendet: Montag, 9. M=C3=A4rz 2020 23:32 > An: Scharf, Michael > Cc: Bob Briscoe; tcpm IETF list; Richard Scheffenegger; Mirja > Kuehlewind > Betreff: Re: [tcpm] New Version Notification > fordraft-ietf-tcpm-accurate-ecn-11.txt >=20 > =C2=A0 >=20 > Hi Michael, >=20 > =C2=A0 >=20 > I agree with out=C2=A0 that it's somewhat painful to deal with the mark= er > bit >=20 > at the beginning for the option field order. >=20 > =C2=A0 >=20 > Another challenge I've come across is to correctly reproduce the >=20 > Accurate ECN state at the sender which would benefit from having >=20 > a few extra bits available. >=20 > =C2=A0 >=20 > It currently requires guessing at every option arrival what the > receiver >=20 > is doing next (what counter it will be increasing next) which is not > very >=20 > robust to ACK losses. On change-triggered ACK, two byte counters are >=20 > increasing rather than one. ACK losses will easily confuse approach > that >=20 > just assumes back-and-forth transitions. Thus, I suggested sending one >=20 > extra option after the change-triggered ACK to allow sender to see >=20 > unambiguous counter delta between the change-triggered ACK and that >=20 > next ACK (it is now in -11). >=20 > =C2=A0 >=20 > To allow the sender to immediately sync with the receiver on any >=20 > AccECN option arrival, it would make sense to encode that information >=20 > into the option itself. It would need 2 extra bits into the option >=20 > so adding that one byte there would help. ...It might be possible to >=20 > combine it to field order and define that the first encoded field is >=20 > the currently increasing counter (the order of the remaining two > fields >=20 > still need to be addressed somehow). >=20 > =C2=A0 >=20 > -- >=20 > =C2=A0i. >=20 > =C2=A0 >=20 > On Mon, 9 Mar 2020, Michael Scharf wrote: >=20 > =C2=A0 >=20 > > >=20 > > With chair hat off, I really wonder if the solution to encode the > two >=20 > > different orders in the TCP Option is an example for good and robust >=20 > > protocol engineering. >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > For instance, the current design makes it hard to decode the field > in a >=20 > > monitoring tool (such as Wireshark). Also, as far as I understand, > it does >=20 > > not allow to switch the encoding during a connection, which limits >=20 > > flexibility. We almost certainly do not understand *now* all future > use >=20 > > cases of this Standard. >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > Unless I miss something, there would be several other solutions: >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > First, IMHO, we have enough TCP option codepoints left to spend two >=20 > > codepoints if there is a good reason for doing so. As compared to > the >=20 > > current design proposal in -10/-11, spending two different option > kinds >=20 > > would look to me like *much* better protocol engineering. >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > Second, if the TCPM community insists in only one option kind > codepoint for >=20 > > whatever reason, IMHO one could add one =E2=80=9Esub-type=E2=80=9C by= te to the > option. The >=20 > > TCP Option field has to be multiples of 4 byte, i.e., if a segment > only >=20 > > contains a 11 byte AccECN TCP option, an additional NOP TCP option > is needed >=20 > > for padding, no? So, what downside have 12 bytes as compared to 11 > bytes? >=20 > > For the shorter variants, the overhead of a =E2=80=9Esub-type=E2=80=9C = field > increases, but >=20 > > it may still be within reasonable limits. What do I miss? >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > Third, one could use different lengths for the different orders, > e.g., >=20 > > lenths 5/8/11 for type 0 and 6/9/12 for type 12. Is this not > possible? >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > In all these cases, the resulting protocol looks simpler and more > robust to >=20 > > me. What prevents us from using the KISS principle? >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > Michael >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > Von: Bob Briscoe >=20 > > Gesendet: Freitag, 6. M=C3=A4rz 2020 04:34 >=20 > > An: tcpm IETF list >=20 > > Cc: Richard Scheffenegger; Mirja Kuehlewind >=20 > > Betreff: Re: [tcpm] New Version Notification for >=20 > > draft-ietf-tcpm-accurate-ecn-11.txt >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > tcpm, >=20 > > >=20 > > You will have seen draft-10 then draft-11 in quick succession, as > already >=20 > > explained. >=20 > > The diffs from draft-09 to -10 were those that had built up since > Jul'19. >=20 > > The diffs from draft-10 to -11 were solely those for the change from > EXP >=20 > > track to STD track. >=20 > > Draft-10 doesn't seem to display in the list of links to each > version, but >=20 > > you can manually write the URL. >=20 > > >=20 > > The main technical changes in draft-10 were numerous - many will be >=20 > > recognized from list discussion since Jul'19. >=20 > > Particular thanks to Ilpo J=C3=A4rvinen who identified many niggles (= and > their >=20 > > solutions) while writing and testing a full Linux implementation > (based on >=20 > > Olivier Tilmans's, in turn based on Mirja's). >=20 > > >=20 > >=C2=A0 *=C2=A0 Allowed 2 different orders of the fields in the AccECN = Option >=20 > >=C2=A0 *=C2=A0 Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, = not also > on >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0 first data packet >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 greatly simplifies implementati= on, esp with TFO. >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 repeating on first data packet = was for reliable delivery, > which is >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 now achieved with ACE = counter (see next bullet) >=20 > >=C2=A0 *=C2=A0 Increment the ACE counter if CE on SYN/ACK (but still n= ot if CE > on SYN) >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 Reliable delivery of feedback o= f CE on SYN/ACK >=20 > >=C2=A0 *=C2=A0 Redefine 'first packet' as first to arrive, not first i= n > sequence in 2 >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0 cases: >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 Handshake reflection on the ACK = of the SYN/ACK >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 In the test for zeroing of ACE >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 Reason: greatly simplifies impl= ementation >=20 > >=C2=A0 *=C2=A0 if ACE could have wrapped more than once, SHOULD assume = =E2=80=9Csafest > likely >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0 case=E2=80=9D >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0 not "conservatively assume" it did cycle >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 Reason: avoid unnecessary hit o= n performance >=20 > >=C2=A0 *=C2=A0 More robustness (with flexibility) in rules for when to = include > an >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0 AccECN Option >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 Change-triggered AccECN Option = as SHOULD, not MUST >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 SHOULD follow change-triggered = AccECN Option with another > (removes >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ambiguity if ACK thin= ning or loss) >=20 > >=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0+=C2=A0 when same counter continues to = increment, SHOULD > consistently >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 include it every n AC= Ks >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 Made rule about precedence of S= ACK conditional (max 2 SACK > blocks) >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 MAY exclude counters that have = not changed for the whole > connection >=20 > >=C2=A0 *=C2=A0 Allowed an AccECN server not to implement RFC3168 ECN (= all > clients still >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0 have to) >=20 > >=C2=A0 *=C2=A0 Precluded mixed capability negotiation from either end >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 reduces freedom to choose SYN & = SYN/ACK fall-back strategies >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 to prevent cases where each end= 's outcome after handshake > could be >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 inconsistent (in reor= dering corner-cases) >=20 > >=C2=A0 *=C2=A0 Reserved the codepoint combination used by the historic = nonce > case >=20 > >=C2=A0 *=C2=A0 Merged in a number of points from RFC3168 that we hadn'= t covered >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 (a whole new subsection about o= bligations to do with ECN) >=20 > >=C2=A0 *=C2=A0 Explicit about checking "acceptable packets" >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 before counting their ECN marki= ngs or before counting the > ECN >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 feedback they carry >=20 > >=C2=A0 *=C2=A0 Required retransmitted Fallback SYN to use same ISN >=20 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=C2=A0 allows servers to detect ECN do= wngrade SYN attacks >=20 > >=C2=A0 *=C2=A0 Handled corner cases like In-window SYN during TIME-WAI= T >=20 > > >=20 > > >=20 > > >=20 > > Bob >=20 > > >=20 > > On 06/03/2020 02:24, internet-drafts@ietf.org wrote: >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt >=20 > > >=20 > > has been successfully submitted by Bob Briscoe and posted to the >=20 > > >=20 > > IETF repository. >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > Name:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 = draft-ietf-tcpm-accurate-ecn >=20 > > >=20 > > Revision: 11 >=20 > > >=20 > > Title:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Mo= re Accurate ECN Feedback in TCP >=20 > > >=20 > > Document date:=C2=A0=C2=A0 2020-03-05 >=20 > > >=20 > > Group:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tc= pm >=20 > > >=20 > > Pages:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 58 >=20 > > >=20 > > URL:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accurat >=20 > > e-ecn-11.txt >=20 > > >=20 > > Status:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ec >=20 > > n/ >=20 > > >=20 > > Htmlized:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11 >=20 > > >=20 > > Htmlized:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accura >=20 > > te-ecn >=20 > > >=20 > > Diff:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-accurate-e >=20 > > cn-11 >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > Abstract: >=20 > > >=20 > > =C2=A0=C2=A0 Explicit Congestion Notification (ECN) is a mechanism wh= ere > network >=20 > > >=20 > > =C2=A0=C2=A0 nodes can mark IP packets instead of dropping them to in= dicate >=20 > > >=20 > > =C2=A0=C2=A0 incipient congestion to the end-points.=C2=A0 Receivers = with an ECN- >=20 > > >=20 > > =C2=A0=C2=A0 capable transport protocol feed back this information to = the > sender. >=20 > > >=20 > > =C2=A0=C2=A0 ECN is specified for TCP in such a way that only one fee= dback > signal >=20 > > >=20 > > =C2=A0=C2=A0 can be transmitted per Round-Trip Time (RTT).=C2=A0 Rece= nt new TCP >=20 > > >=20 > > =C2=A0=C2=A0 mechanisms like Congestion Exposure (ConEx), Data Center = TCP > (DCTCP) >=20 > > >=20 > > =C2=A0=C2=A0 or Low Latency Low Loss Scalable Throughput (L4S) need m= ore > accurate >=20 > > >=20 > > =C2=A0=C2=A0 ECN feedback information whenever more than one marking = is > received >=20 > > >=20 > > =C2=A0=C2=A0 in one RTT.=C2=A0 This document specifies a scheme to pr= ovide more > than >=20 > > >=20 > > =C2=A0=C2=A0 one feedback signal per RTT in the TCP header.=C2=A0 Giv= en TCP header >=20 > > >=20 > > =C2=A0=C2=A0 space is scarce, it allocates a reserved header bit, tha= t was >=20 > > >=20 > > =C2=A0=C2=A0 previously used for the ECN-Nonce which has now been dec= lared >=20 > > >=20 > > =C2=A0=C2=A0 historic.=C2=A0 It also overloads the two existing ECN f= lags in the > TCP >=20 > > >=20 > > =C2=A0=C2=A0 header.=C2=A0 The resulting extra space is exploited to = feed back the > IP- >=20 > > >=20 > > =C2=A0=C2=A0 ECN field received during the 3-way handshake as well.=C2= =A0 > Supplementary >=20 > > >=20 > > =C2=A0=C2=A0 feedback information can optionally be provided in a new = TCP > option, >=20 > > >=20 > > =C2=A0=C2=A0 which is never used on the TCP SYN. >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 >=20 > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > Please note that it may take a couple of minutes from the time of > submission >=20 > > >=20 > > until the htmlized version and diff are available at tools.ietf.org. >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > The IETF Secretariat >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > =C2=A0 >=20 > > >=20 > > >=20 > > >=20 > >=C2=A0 >=20 > =C2=A0 >=20 >=20 > --=_script-7198-1583930272-0001-2-- From nobody Thu Mar 12 08:23:46 2020 Return-Path: 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 24F793A0C4C; Thu, 12 Mar 2020 08:23:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 2.904 X-Spam-Level: ** X-Spam-Status: No, score=2.904 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, GB_SUMOF=5, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=no 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draft-ietf-tcpm-2140bis-01 Thread-Index: AdX4gi41h/A8i6ISSjiREsL6G8etsA== Content-Class: urn:content-classes:message Date: Thu, 12 Mar 2020 15:23:28 +0000 Message-ID: <6EC6417807D9754DA64F3087E2E2E03E2D9DABF1@rznt8114.rznt.rzdir.fht-esslingen.de> Accept-Language: de-DE, en-US Content-Language: de-DE X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: multipart/alternative; boundary="_000_6EC6417807D9754DA64F3087E2E2E03E2D9DABF1rznt8114rzntrzd_" MIME-Version: 1.0 Archived-At: Subject: Re: [tcpm] draft-ietf-tcpm-2140bis-01 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 15:23:44 -0000 --_000_6EC6417807D9754DA64F3087E2E2E03E2D9DABF1rznt8114rzntrzd_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 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From nobody Thu Mar 12 09:15:09 2020 Return-Path: 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 15A0C3A0CF5 for ; Thu, 12 Mar 2020 09:15:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.099 X-Spam-Level: X-Spam-Status: No, score=-2.099 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham 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 6K0TW8eBk04f for ; Thu, 12 Mar 2020 09:15:03 -0700 (PDT) Received: from cl3.bcs-hosting.net (cl3.bcs-hosting.net [3.11.37.202]) (using TLSv1.2 with cipher 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Received: from [31.185.135.141] (port=60830 helo=[192.168.0.4]) by cl3.bcs-hosting.net with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1jCQU7-00DRdm-Qu; Thu, 12 Mar 2020 16:15:00 +0000 To: =?UTF-8?Q?Ilpo_J=c3=a4rvinen?= Cc: Michael Scharf , tcpm IETF list , Richard Scheffenegger , Mirja Kuehlewind References: <6EC6417807D9754DA64F3087E2E2E03E2D9CCC8D@rznt8114.rznt.rzdir.fht-esslingen.de> <728285ba-0677-25f3-844f-d8f2f9781df1@bobbriscoe.net> From: Bob Briscoe Message-ID: Date: Thu, 12 Mar 2020 16:14:59 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cl3.bcs-hosting.net 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: cl3.bcs-hosting.net: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: cl3.bcs-hosting.net: in@bobbriscoe.net X-Source: X-Source-Args: X-Source-Dir: Archived-At: Subject: Re: [tcpm] New Version Notificationfordraft-ietf-tcpm-accurate-ecn-11.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 16:15:07 -0000 Ilpo, On 11/03/2020 12:37, Ilpo Järvinen wrote: > Hi all, > > Here's the option format with the extra octet: > > 0 1 2 3 > 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | Kind = TBD1 | Length = 11 | Reserved |Cnt| EE0B field | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | EE0B (cont'd) | ECEB field | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | | EE1B field | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > Cnt indicates the counter (IP-ECN field value) from the last received > packet. The receiver incremented this counter with this ACK. The counter > value might have not increased if the payload length was zero but > a subsequent packet would increase the same counter if IP-ECN field > remains the same. > > The octet containing Cnt MUST be included when any byte counter is > included. I don't think this needs to be a MUST at all. The most important thing is to include the Cnt bits when there are no other counters (the case in the sentences below). > It MAY be left out otherwise. I think you are referring to an empty option on the SYN/ACK here (to declare that the server is sending options). I can't think of any other use for an empty option. > If an AccECN option without bytes > counters is increased but Cnt value is included and changed, the sender > switches to the indicated counter (but cannot sync counters which may be > be somewhat off in case of ACK losses). This last sentence is the most important part that you hadn't stated before.     (I assume there's a typo: s/increased/included/.) But you haven't said whether it's MUST or SHOULD (except the previous sentence says that it MAY be left out). It cannot be a MUST (in case there isn't any option space on a particular packet). If we were to go in this direction, this sentence surely ought be a "SHOULD" with the same strength as the "SHOULD" for Change-Triggered ACKs. > > If the Option is sent in a change-triggered ACK, the Cnt field will > differ from the previously sent value. For other ACKs the option, Cnt is > the same as previously. As a new AccECN options should be sent in > the next change-triggered ACK, the IP-ECN field edges are captured. > > Now, even if there were any number of ACK losses prior to receiving > such an AccECN option, the sender can immediately sync with the receiver's > state I think you only mean the receiver's state relating to which ACK counter is currently changing. The state of the counters can still be wrong, due to previous ACK losses. > and knows what counter the receiver will be increasing, no need to > guess that based on any byte counter delta (on the next ACK if it > doesn't contain AccECN option). > > The main point with Cnt is to help the sender to do more accurate > estimation in the cases where ACKs without AccECN option arrive. > As such estimation needs only run on ACKs, the Cnt information does > not require sending extra ACKs at any point of time. In fact, the > change-triggered ACKs requirement could even be relaxed with it > because together the byte counters and Cnt sync the AccECN state > such that knowing the exact point of the IP-ECN field edge is no > longer as necessary as earlier. I believe you are saying that the meaning of Cnt on an acceptable ACK is twofold: 1) For the past:     * If the byte counter indicated by Cnt is absent from this option, consider the new bytes acked by this packet to have incremented that counter.     * If the byte counter indicated by Cnt is present on this option ??? (Does it have any other use for the past?) 2) For the future:     * If there is no AccECN Option on a subsequent acceptable ACK that acknowledges new data, consider the new bytes acked by that packet to have incremented the byte counter indicated by the last seen value of Cnt. In the presence of ACK loss: * Meaning#1 is much more useful. * Meaning #2 is less useful, because if ACKs are being thinned or lost, the value of Cnt most recently received by the Data Sender won't necessarily be the one most recently sent by the Data Receiver. Assessment: * Meaning #2: To put it ironically, this scheme tries to solve the problem of losing ACKs that say which counter will change in future, by introducing a field on an ACK that says which counter will change in future. But the ACK carrying this new field is just as likely to be lost as the old way. * Meaning #1: Then the question has to be, if Cnt is most useful on a packet without the associated counter (meaning#1), then why not include that counter? IOW, Cnt consumes 3B to save 5B (or sometimes to save 8B) (including the overhead of the option kind and length). And note that Cnt is still ambiguous, whereas including the actual counter is unambiguous. I guess the idea of Cnt arose from reading all the SHOULDs about when to send an AccECN Option as if they might not be adhered to. So this additional 1B field is really only solving a problem where there is not space for 5B or 8B, but there is space for 3B. > > If Cnt is zero, the receiver got a packet with non-ECT and no counter > is increasing as a result of the ACK or subsequent ACKs until next > the AccECN option arrival. More precisely, I think you mean that all the new bytes ACK'd by this packet were Not-ECT. That's useful. Without Cnt this is only really possible by sending an option with all three counters then sending one later with the counters unchanged. > > Since the byte counter indicated with Cnt field is typically increasing, > it would be possible to make the Cnt value dual purpose and use it to > indicate which counter appears first in the Option (if there are any > counters in the first place). This would partically resolve Michael's > concern about the field ordering. Other counters that have changed since > the receiver sent last AccECN option should be included after the > first field (in some order, specifying the order of the remaining > fields is beyond this Cnt proposal). As you say, we don't have to do this. I'm yet to be convinced of the value of allowing the field order to change on each packet, just because we want the field order to be able to be changed for each connection. Bob > > -- > i. > > > On Tue, 10 Mar 2020, Bob Briscoe wrote: > >> Ilpo, >> >> Can you please describe the idea more fully? I cannot understand it from the >> description, although I thought I understood it when you explained it to me >> (off list). >> >> Here's my understanding of the problem, for the benefit of the list (Ilpo >> and I have been discussing this off list, and I don't think the list will >> understand without this): >> >> * This is all in the context of a Receiver that is sending AccECN TCP >> Options. It doesn't have to send these options at all but, if it does, they >> complement and help disambiguate the 3-bit ACE counter in the main TCP >> header (which is always used). >> * Further context: Even if a receiver is sending the AccECN Option, it can >> choose to sometimes send ACKs without an AccECN Option, and the sender can >> then assume that all the bytes ACK'd had the same ECN marking (perhaps >> wrongly if there have been ACK losses). >> * The proposed rules for when to use the AccECN Option are here: >> https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11#section-3.2.3.3 >> >> >> The first rule is: >> >> Change-Triggered ACKs: If an arriving packet increments a different >> byte counter to that incremented by the previous packet, the Data >> Receiver SHOULD immediately send an ACK with an AccECN Option, >> without waiting for the next delayed ACK [...]. >> >> Even though this bullet is stated as a "SHOULD", it is important >> for a transition to immediately trigger an ACK if at all possible, >> ... >> Originally Ilpo thought this made the sender implementation too difficult, >> even in very common delayed ACK cases, e.g.: >> >>     ECT1 >> ACK#1 (ECT1 counter) >>     ECT1 >>     CE >> ACK#2 (ECT1 & CE counters) >>     ECT1 >> ACK#3 (ECT1 counter) >>     ECT1 >>     ECT1 >> ACK#4 (no AccECN Option) >>     ECT1 >>     ECT1 >> ACK#5 (no AccECN Option) >> ... >> >> In ACK#2, both ECT1 and CE counters have incremented, so how does the sender >> know which counter triggered this ACK? it needs to know this to guess which >> counter to increment if it gets an ACK without an AccECN Option. >> My answer: the sender can infer that CE triggered the second ACK shown, >> because in the previous ACK, only ECT1 was incrementing. >> >> Ilpo was concerned that, in the case where ACK#3 is lost or thinned, the >> sender could assume from the subsequent lack of any AccECN Options that more >> and more CE was arriving, when actually more and more ECT1 was arriving. >> >> I agreed, but my argument was that there are more "SHOULD" rules for the >> receiver, such as: >> >> * It SHOULD always include an AccECN Option if the r.ceb counter >> is incrementing and it MAY include an AccECN Option if r.ec0b >> or r.ec1b is incrementing >> So, certainly it is possible that there will be ambiguous occasions when >> there is no AccECN Option. However, the idea is not to omit an AccECN option >> at all unless there is no space (e.g. because some other option takes >> priority). So these cases where assumptions have to be made are not intended >> to be routine - the rules are only written as SHOULDs in order to give the >> receiver flexibility if it needs the space to send other options. it is not >> expected to break all the SHOULD rules all the time. >> >> Nonetheless, it did make sense to add this rule, at Ilpo's suggestion: >> >> * It SHOULD include a counter that has continued to increment on >> the next scheduled ACK following a change-triggered ACK; >> For example, ACks #3 and #5 below are due to this rule: >> >>     ECT1 >> ACK#1 (ECT1 counter) >>     ECT1 >>     CE >> ACK#2 (ECT1 & CE counters) >>     CE >>     CE >> ACK#3 (CE counter) >>     ECT1 >> ACK#4 (ECT1 counter) >>     ECT1 >>     ECT1 >> ACK#5 (ECT1 counter) >>     ECT1 >>     ECT1 >> ACK#6 (no AccECN Option) >> ... >> >> >> But I pointed out that, of course, this doesn't fully solve the problem, >> because this second AccECN Option could be lost, just as easily as the first >> (obviously a lower probability that they are both lost, but this could be >> common with heavy ACK thinning). >> >> It was at this point that Ilpo suggested that a 2-bit field in a 1-byte >> option could specify which was the last counter to have changed. >> >> However, now I re-read both Ilpo's offlist and the onlist emails, I'm not >> sure I understand the rules of the scheme, whereas I thought I did. >> >> >> Ilpo, can you write a really precise and full spec of your proposal, stating >> all assumptions? >> Are ACKs without any AccECN Option allowed? Or are you saying this 1 byte >> option MUST always be included? >> >> >> >> Bob >> >> On 10/03/2020 06:38, Scharf, Michael wrote: >> >> Yep, if one byte was added, there would probably be remaining >> bits left. >> >> >> >> RFC 5218 Section 2.2.1: „Protocols that are extensible are more >> likely to be wildly successful in terms of being used for >> purposes outside their original design.“ >> >> >> >> Michael >> >> >> >> Von: Ilpo Järvinen >> Gesendet: Montag, 9. März 2020 23:32 >> An: Scharf, Michael >> Cc: Bob Briscoe; tcpm IETF list; Richard Scheffenegger; Mirja >> Kuehlewind >> Betreff: Re: [tcpm] New Version Notification >> fordraft-ietf-tcpm-accurate-ecn-11.txt >> >> >> >> Hi Michael, >> >> >> >> I agree with out  that it's somewhat painful to deal with the marker >> bit >> >> at the beginning for the option field order. >> >> >> >> Another challenge I've come across is to correctly reproduce the >> >> Accurate ECN state at the sender which would benefit from having >> >> a few extra bits available. >> >> >> >> It currently requires guessing at every option arrival what the >> receiver >> >> is doing next (what counter it will be increasing next) which is not >> very >> >> robust to ACK losses. On change-triggered ACK, two byte counters are >> >> increasing rather than one. ACK losses will easily confuse approach >> that >> >> just assumes back-and-forth transitions. Thus, I suggested sending one >> >> extra option after the change-triggered ACK to allow sender to see >> >> unambiguous counter delta between the change-triggered ACK and that >> >> next ACK (it is now in -11). >> >> >> >> To allow the sender to immediately sync with the receiver on any >> >> AccECN option arrival, it would make sense to encode that information >> >> into the option itself. It would need 2 extra bits into the option >> >> so adding that one byte there would help. ...It might be possible to >> >> combine it to field order and define that the first encoded field is >> >> the currently increasing counter (the order of the remaining two >> fields >> >> still need to be addressed somehow). >> >> >> >> -- >> >>  i. >> >> >> >> On Mon, 9 Mar 2020, Michael Scharf wrote: >> >> >> >>> With chair hat off, I really wonder if the solution to encode the >> two >> >>> different orders in the TCP Option is an example for good and robust >>> protocol engineering. >>> >>> For instance, the current design makes it hard to decode the field >> in a >> >>> monitoring tool (such as Wireshark). Also, as far as I understand, >> it does >> >>> not allow to switch the encoding during a connection, which limits >>> flexibility. We almost certainly do not understand *now* all future >> use >> >>> cases of this Standard. >>> >>> Unless I miss something, there would be several other solutions: >>> >>> First, IMHO, we have enough TCP option codepoints left to spend two >>> codepoints if there is a good reason for doing so. As compared to >> the >> >>> current design proposal in -10/-11, spending two different option >> kinds >> >>> would look to me like *much* better protocol engineering. >>> >>> Second, if the TCPM community insists in only one option kind >> codepoint for >> >>> whatever reason, IMHO one could add one „sub-type“ byte to the >> option. The >> >>> TCP Option field has to be multiples of 4 byte, i.e., if a segment >> only >> >>> contains a 11 byte AccECN TCP option, an additional NOP TCP option >> is needed >> >>> for padding, no? So, what downside have 12 bytes as compared to 11 >> bytes? >> >>> For the shorter variants, the overhead of a „sub-type“ field >> increases, but >> >>> it may still be within reasonable limits. What do I miss? >>> >>> Third, one could use different lengths for the different orders, >> e.g., >> >>> lenths 5/8/11 for type 0 and 6/9/12 for type 12. Is this not >> possible? >> >>> >>> In all these cases, the resulting protocol looks simpler and more >> robust to >> >>> me. What prevents us from using the KISS principle? >>> >>> Michael >>> >>> >>> >>> Von: Bob Briscoe >>> Gesendet: Freitag, 6. März 2020 04:34 >>> An: tcpm IETF list >>> Cc: Richard Scheffenegger; Mirja Kuehlewind >>> Betreff: Re: [tcpm] New Version Notification for >>> draft-ietf-tcpm-accurate-ecn-11.txt >>> >>> tcpm, >>> You will have seen draft-10 then draft-11 in quick succession, as >> already >> >>> explained. >>> The diffs from draft-09 to -10 were those that had built up since >> Jul'19. >> >>> The diffs from draft-10 to -11 were solely those for the change from >> EXP >> >>> track to STD track. >>> Draft-10 doesn't seem to display in the list of links to each >> version, but >> >>> you can manually write the URL. >>> The main technical changes in draft-10 were numerous - many will be >>> recognized from list discussion since Jul'19. >>> Particular thanks to Ilpo Järvinen who identified many niggles (and >> their >> >>> solutions) while writing and testing a full Linux implementation >> (based on >> >>> Olivier Tilmans's, in turn based on Mirja's). >>>   *  Allowed 2 different orders of the fields in the AccECN Option >>>   *  Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also >> on >> >>>      first data packet >>>       +  greatly simplifies implementation, esp with TFO. >>>       +  repeating on first data packet was for reliable delivery, >> which is >> >>>          now achieved with ACE counter (see next bullet) >>>   *  Increment the ACE counter if CE on SYN/ACK (but still not if CE >> on SYN) >> >>>       +  Reliable delivery of feedback of CE on SYN/ACK >>>   *  Redefine 'first packet' as first to arrive, not first in >> sequence in 2 >> >>>      cases: >>>       +  Handshake reflection on the ACK of the SYN/ACK >>>       +  In the test for zeroing of ACE >>>       +  Reason: greatly simplifies implementation >>>   *  if ACE could have wrapped more than once, SHOULD assume “safest >> likely >> >>>      case” >>>      not "conservatively assume" it did cycle >>>       +  Reason: avoid unnecessary hit on performance >>>   *  More robustness (with flexibility) in rules for when to include >> an >> >>>      AccECN Option >>>       +  Change-triggered AccECN Option as SHOULD, not MUST >>>       +  SHOULD follow change-triggered AccECN Option with another >> (removes >> >>>          ambiguity if ACK thinning or loss) >>>       +  when same counter continues to increment, SHOULD >> consistently >> >>>          include it every n ACKs >>>       +  Made rule about precedence of SACK conditional (max 2 SACK >> blocks) >> >>>       +  MAY exclude counters that have not changed for the whole >> connection >> >>>   *  Allowed an AccECN server not to implement RFC3168 ECN (all >> clients still >> >>>      have to) >>>   *  Precluded mixed capability negotiation from either end >>>       +  reduces freedom to choose SYN & SYN/ACK fall-back strategies >>>       +  to prevent cases where each end's outcome after handshake >> could be >> >>>          inconsistent (in reordering corner-cases) >>>   *  Reserved the codepoint combination used by the historic nonce >> case >> >>>   *  Merged in a number of points from RFC3168 that we hadn't covered >>>       +  (a whole new subsection about obligations to do with ECN) >>>   *  Explicit about checking "acceptable packets" >>>       +  before counting their ECN markings or before counting the >> ECN >> >>>          feedback they carry >>>   *  Required retransmitted Fallback SYN to use same ISN >>>       +  allows servers to detect ECN downgrade SYN attacks >>>   *  Handled corner cases like In-window SYN during TIME-WAIT >>> Bob >>> On 06/03/2020 02:24, internet-drafts@ietf.org wrote: >>> >>> A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt >>> has been successfully submitted by Bob Briscoe and posted to the >>> IETF repository. >>> >>> Name:            draft-ietf-tcpm-accurate-ecn >>> Revision: 11 >>> Title:           More Accurate ECN Feedback in TCP >>> Document date:   2020-03-05 >>> Group:           tcpm >>> Pages:           58 >>> URL: >> https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accurat >> >>> e-ecn-11.txt >>> Status: >> https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ec >> >>> n/ >>> Htmlized: >> https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11 >> >>> Htmlized: >> https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accura >> >>> te-ecn >>> Diff: >> https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-e >> >>> cn-11 >>> >>> Abstract: >>>    Explicit Congestion Notification (ECN) is a mechanism where >> network >> >>>    nodes can mark IP packets instead of dropping them to indicate >>>    incipient congestion to the end-points.  Receivers with an ECN- >>>    capable transport protocol feed back this information to the >> sender. >> >>>    ECN is specified for TCP in such a way that only one feedback >> signal >> >>>    can be transmitted per Round-Trip Time (RTT).  Recent new TCP >>>    mechanisms like Congestion Exposure (ConEx), Data Center TCP >> (DCTCP) >> >>>    or Low Latency Low Loss Scalable Throughput (L4S) need more >> accurate >> >>>    ECN feedback information whenever more than one marking is >> received >> >>>    in one RTT.  This document specifies a scheme to provide more >> than >> >>>    one feedback signal per RTT in the TCP header.  Given TCP header >>>    space is scarce, it allocates a reserved header bit, that was >>>    previously used for the ECN-Nonce which has now been declared >>>    historic.  It also overloads the two existing ECN flags in the >> TCP >> >>>    header.  The resulting extra space is exploited to feed back the >> IP- >> >>>    ECN field received during the 3-way handshake as well. >> Supplementary >> >>>    feedback information can optionally be provided in a new TCP >> option, >> >>>    which is never used on the TCP SYN. >>> >>> >> >> >>> >>> >>> >>> Please note that it may take a couple of minutes from the time of >> submission >> >>> until the htmlized version and diff are available at tools.ietf.org. >>> >>> The IETF Secretariat >>> >>> >>> >> >> >> > > -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ From nobody Thu Mar 12 09:27:10 2020 Return-Path: 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 B57423A0D2C; Thu, 12 Mar 2020 09:27:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 3.101 X-Spam-Level: *** X-Spam-Status: No, score=3.101 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, GB_SUMOF=5, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no 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 eFdvv3YiLLY6; Thu, 12 Mar 2020 09:27:05 -0700 (PDT) Received: from mail-out02.uio.no (mail-out02.uio.no [IPv6:2001:700:100:8210::71]) (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 667783A0D29; Thu, 12 Mar 2020 09:27:04 -0700 (PDT) Received: from mail-mx11.uio.no ([129.240.10.83]) by mail-out02.uio.no with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93.0.4) (envelope-from ) id 1jCQfl-0008mD-NL; Thu, 12 Mar 2020 17:27:01 +0100 Received: from ti0182q160-5615.bb.online.no ([84.202.72.50] helo=[10.0.0.12]) by mail-mx11.uio.no with esmtpsa (TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256) user michawe (Exim 4.93.0.4) (envelope-from ) id 1jCQfh-000DK2-Lo; Thu, 12 Mar 2020 17:27:01 +0100 From: Michael Welzl Message-Id: Content-Type: multipart/alternative; boundary="Apple-Mail=_FF64B538-F0D5-449B-9976-4D296C194266" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Date: Thu, 12 Mar 2020 17:26:56 +0100 In-Reply-To: <6EC6417807D9754DA64F3087E2E2E03E2D9DABF1@rznt8114.rznt.rzdir.fht-esslingen.de> Cc: "draft-ietf-tcpm-2140bis@ietf.org" , tcpm IETF list To: "Scharf, Michael" References: <6EC6417807D9754DA64F3087E2E2E03E2D9DABF1@rznt8114.rznt.rzdir.fht-esslingen.de> X-Mailer: Apple Mail (2.3445.104.11) X-UiO-SPF-Received: Received-SPF: neutral (mail-mx11.uio.no: 84.202.72.50 is neither permitted nor denied by domain of ifi.uio.no) client-ip=84.202.72.50; envelope-from=michawe@ifi.uio.no; helo=[10.0.0.12]; X-UiO-Spam-info: not spam, SpamAssassin (score=-5.0, required=5.0, autolearn=disabled, HTML_MESSAGE=0.001, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: 7EAA525EE447F37790700A204CC8E79D56A5A8B2 Archived-At: Subject: Re: [tcpm] draft-ietf-tcpm-2140bis-01 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 16:27:08 -0000 --Apple-Mail=_FF64B538-F0D5-449B-9976-4D296C194266 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On Mar 12, 2020, at 4:23 PM, Scharf, Michael = wrote: >=20 > Hi Michael, > =20 > Thanks a lot for the update. Indeed, the organization of the content = has improved a lot. > =20 > A small editorial nit: s/TCP/TCB/ in =E2=80=9E6.2. Updates to the new = TCP=E2=80=9C? Oops :) sure! =20 > With chair hat on: I will try to find at least one other reviewer for = this document. And a heads-up to the community: A WGLC is planned within = the next few months, subject to the constraint that there shall be not = too many parallel WGLCs in TCPM. > =20 > Thanks Thanks to you! Cheers, Michael > =20 > Michael > =20 > =20 > =20 > Von: Michael Welzl > Gesendet: Samstag, 29. Februar 2020 23:59 > An: Scharf, Michael > Cc: draft-ietf-tcpm-2140bis@ietf.org = ; tcpm IETF list = > Betreff: Re: [tcpm] draft-ietf-tcpm-2140bis-01 > =20 > Hi Michael,=20 > =20 > We have now addressed your comments (please see below). >=20 >=20 > Begin forwarded message: > =20 > From: "Scharf, Michael" > > Subject: draft-ietf-tcpm-2140bis-01 > Date: 30 January 2020 at 01:28:50 CET > To: "draft-ietf-tcpm-2140bis@ietf.org = " = >, tcpm IETF list = > > Resent-From: > > Resent-To: >, = >, > > =20 > Hi, > =20 > I have read the most recent version of 2140bis. As usually, my = comments are posted with chair hat off. > =20 > I encourage others to also read the document. > =20 > Issues / comments: > =20 > The document structure follows in many cases exactly RFC 2140, even if = content has changed. In some cases, this confuses me. For instance, the = Section =E2=80=9EAn Ensample of Temporal Sharing=E2=80=9C in RFC 2140 = indeed contained an implementation example. Section 6 of RFC 2140bis is = generic. This raises at least two questions f=C3=BCr Section 6 and = similarly for Section 7: > 1. Is the title for the section still appropriate? > =20 > Good catch, thanks! It isn't. Fixed it to "Temporal Sharing" (and = "Ensemble Sharing" in case of Section 7). > =20 > =20 > 2. Is some additional explanation needed e.g. on page 6 that an = implementation can decide to implement only subsets of the table on page = 6, as an early heads-up? > =20 > We don't make a recommendations for implementers but just present the = possibilities with their pro's and con's; hence the text points at = sections 8 and 9 for compatibility issues and implications of sharing = the information. Thus, we believe that's the most appropriate type of = "early heads-up". > =20 >=20 >=20 > Sections 6, 7, 8, 9 and 10 are longer than the original 2140. I wonder = if subsections would be useful to better structure them. At least I find = some of the long text blocks hard to read and it is not always apparent = how a given paragraph fits into the overall storyline. I suspect that = the document would be easier to parse with some more structuring (e.g., = subsections). > =20 > We inserted sub-headings in Sections 6, 7, 8 and 9. This was great = advice indeed! This should be much clearer now, especially sections 6 = and 7. > =20 >=20 >=20 > The internal structure of Section 8 is hard to understand. For = instance, ECMP and LAG are discussed twice. Also, this section discusses = quite a number of different aspects, including fairness, challenges with = ECMP/LAG, interactions with fast recovery and NAT. I suggest to either = add early an explanation what is meant by =E2=80=9Ecompatibility=E2=80=9C,= or to use sub-sections to make clear what topics are in scope (see = above). > =20 > We have re-organized the text here a bit, removing a redundant = statement about ECMP and LAG, and inserted sub-headings in Section 8. > =20 >=20 >=20 > The separation of topics between Section 8 and 9 is not fully clear to = me (different to RFC 2140 =E2=80=93 prior to deployment these sections = had a relatively clear meaning). For instance, both sections discuss = traffic with possibly short flows (e.g., http). I think the existing = content could be reorganized by copy&paste in sections with a = well-defined focus. Example section titles could be: > Fairness issues > Impact on applications and performance > Interactions with network mechanism > Discussion of design aspects and alternatives > =E2=80=A6 (or other terms =E2=80=93 I just post this list to = illustrate that alternatives could exist) > =20 > =20 > 8 are issues local to the TCB sharing function; 9 are interactions = with other architecture and protocol issues. Although the sum of the two = sections could be completely revised, we don't currently see a benefit. > =20 >=20 >=20 > The table on page 15 is a bit dated. I hope that we could update that, = say, during a WGLC > =20 > We believe that the best approach is to copy+paste this table into an = email and send it to the mailing list for checking. We'll do this. > =20 >=20 >=20 > Section 12: I am not sure if I fully understand the attack vectors = section. For instance, how would an attack like =E2=80=9Ean application = can open a connection and set its window size to zero, denying service = to any other subsequent connection between those hosts.=E2=80=9C work if = the receive window is not shared? > =20 > We agree, this was wrong; we removed this line. > =20 >=20 >=20 > In addition, I wonder if privacy needs to be discussed, e.g., whether = user tracking or fingerprinting is possible by the methods discussed in = the document. > =20 > Added a paragraph to the security section addressing this. We believe = the mixing mitigates the effect of reuse. > =20 > =20 > Section 14: I would classify more references as =E2=80=9Enormative=E2=80= =9C (e.g., RFC 793) > =20 > Done (RFC 793, 1122, the PMTUD RFCs and the TFO RFC) > =20 >=20 >=20 > Appendix C.3: I really wonder why not to specify the algorithm with = (optional) persistence across reboots > =20 > Because it's the same as temporal sharing, just with different = averaging and information decay. > =20 >=20 >=20 > =20 > Editorial nits: > =20 > Please ensure that capitalization of all headlines is consistent = (e.g., title of Apendix A) > =20 > Done > =20 >=20 >=20 > Same for all table captions (e.g., caption =E2=80=9EOption info=E2=80=9C= ) > =20 > Done. > =20 >=20 >=20 > Section 2: I am not sure about this wording: s/permitted by TCP = implementers/permitted by TCP standards/ ??? > =20 > Done (replaced as you suggest). > =20 >=20 >=20 > In the table on Section 5, =E2=80=9Eround-trip time and variance=E2=80=9C= appears twice, is this a bug or a feature? (Same as in RFC 2140) > =20 > It's a bug. Removed. > =20 >=20 >=20 > Page 7 refers to Appendix B. If that appendix shall indeed be removed = prior to publication, that reference also needs to be removed. Maybe = that sentence should be flagged for removal, too?! > =20 > Done. > =20 >=20 >=20 > On page 7 and 8, I believe that the position of the tables could be = rearranged so that they are not rendered back-to-back. Both tables seem = partly unrelated and the current position may be a bit confusing. Same = issue later on page 10. (Alternatively, the tables could be numbered to = make clear that they are separate.) > =20 > Fixed: the tables are now clearer due to the new subheadings. > =20 >=20 >=20 > On page 8, the order of the entries in the table and the order of = their explanation is not well aligned. This may be a matter of personal = taste, but I would expect a somewhat similar order. > =20 > Fixed. > =20 >=20 >=20 > Page 8/9: =E2=80=9EThe method for merging old and current values needs = to attempt to reduce the transient for new connections.=E2=80=9C I am = not sure if I fully understand what is meant by this (albeit I suspect a = certain meaning). > =20 > Clarified. > =20 > =20 > Page 9: The table in the upper part of the page is not explained. I = think it would make sense to have at least one sentence to introduce it. > =20 > This is fixed by the newly introduced subheadings which clarify that = some tables are for initialization and some for cache updates. > =20 >=20 >=20 > Page 11: The position of the table confuses me. > =20 > Fixed. > =20 > =20 > Best Regards, > Joe, Michael and Safiqul > =20 --Apple-Mail=_FF64B538-F0D5-449B-9976-4D296C194266 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

On Mar 12, 2020, at 4:23 PM, Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:

Hi = Michael,
 
Thanks a = lot for the update. Indeed, the organization of the content has improved = a lot.
 
A small = editorial nit: s/TCP/TCB/ in =E2=80=9E6.2. Updates to the new = TCP=E2=80=9C?

Oops=  :)   sure!

 
With chair hat on: I will try to find = at least one other reviewer for this document. And a heads-up to the = community: A WGLC is planned within the next few months, subject to the = constraint that there shall be not too many parallel WGLCs in TCPM.
 
Thanks

Thanks= to you!

Cheers,
Michael


 
Michael
 
 
 
Von: Michael Welzl
Gesendet: Samstag, 29. Februar = 2020 23:59
An: Scharf, Michael
Cc: draft-ietf-tcpm-2140bis@ietf.org; tcpm IETF list
Betreff: Re: [tcpm] = draft-ietf-tcpm-2140bis-01
 
Hi Michael, 
 
We have now addressed your comments = (please see below).


Begin forwarded message:
 
From: "Scharf, Michael" <Michael.Scharf@hs-esslingen.de>
Subject: draft-ietf-tcpm-2140bis-01
Date: 30 January 2020 at 01:28:50 = CET
Resent-From: <alias-bounces@ietf.org>
 
Hi,
 
I have read the most recent version of = 2140bis. As usually, my comments are posted with chair hat off.
 
I encourage others to also read the = document.
 
Issues / comments:
 
  • The document structure follows in many cases = exactly RFC 2140, even if content has changed. In some cases, this = confuses me. For instance, the Section =E2=80=9EAn Ensample of Temporal = Sharing=E2=80=9C in RFC 2140 indeed contained an implementation example. = Section 6 of RFC 2140bis is generic. This raises at least two questions = f=C3=BCr Section 6 and similarly for Section 7:

1.       Is the title = for the section still appropriate?

 
Good catch, thanks! It isn't. Fixed it to "Temporal Sharing" = (and "Ensemble Sharing" in case of Section 7).
 
 

2.       Is some = additional explanation needed e.g. on page 6 that an implementation can = decide to implement only subsets of the table on page 6, as an early = heads-up?

 
We don't make a recommendations for = implementers but just present the possibilities with their pro's and = con's; hence the text points at sections 8 and 9 for compatibility = issues and implications of sharing the information. Thus, we believe = that's the most appropriate type of "early heads-up".
 


  • Sections = 6, 7, 8, 9 and 10 are longer than the original 2140. I wonder if = subsections would be useful to better structure them. At least I find = some of the long text blocks hard to read and it is not always apparent = how a given paragraph fits into the overall storyline. I suspect that = the document would be easier to parse with some more structuring (e.g., = subsections).
 
We inserted sub-headings in Sections 6, 7, 8 and 9. This was = great advice indeed! This should be much clearer now, especially = sections 6 and 7.
 


  • The = internal structure of Section 8 is hard to understand. For instance, = ECMP and LAG are discussed twice. Also, this section discusses quite a = number of different aspects, including fairness, challenges with = ECMP/LAG, interactions with fast recovery and NAT. I suggest to either = add early an explanation what is meant by =E2=80=9Ecompatibility=E2=80=9C,= or to use sub-sections to make clear what topics are in scope (see = above).
 
We have re-organized the text here a bit, removing a = redundant statement about ECMP and LAG, and inserted sub-headings in = Section 8.
 


  • The = separation of topics between Section 8 and 9 is not fully clear to me = (different to RFC 2140 =E2=80=93 prior to deployment these sections had = a relatively clear meaning). For instance, both sections discuss traffic = with possibly short flows (e.g., http). I think the existing content = could be reorganized by copy&paste in sections with a well-defined = focus. Example section titles could be:
  • Fairness = issues
  • Impact on applications and performance
  • Interactions with network mechanism
  • Discussion of design aspects and alternatives
  • =E2=80=A6 (or other terms =E2=80=93 I just post this list = to illustrate that alternatives could exist)
 
 
8 are issues local to the TCB sharing = function; 9 are interactions with other architecture and protocol = issues. Although the sum of the two sections could be completely = revised, we don't currently see a benefit.
 


  • The table = on page 15 is a bit dated. I hope that we could update that, say, during = a WGLC
 
We believe that the best approach is to copy+paste this table = into an email and send it to the mailing list for checking. We'll do = this.
 


  • Section = 12: I am not sure if I fully understand the attack vectors section. For = instance, how would an attack like =E2=80=9Ean application can open a = connection and set its window size to zero, denying service to any other = subsequent connection between those hosts.=E2=80=9C work if the receive = window is not shared?
 
We agree, this was wrong; we removed this line.
 


  • In = addition, I wonder if privacy needs to be discussed, e.g., whether user = tracking or fingerprinting is possible by the methods discussed in the = document.
 
Added a paragraph to the security = section addressing this. We believe the mixing mitigates the effect of = reuse.
 
 
  • Section 14: I would classify more references as = =E2=80=9Enormative=E2=80=9C (e.g., RFC 793)
 
Done (RFC 793, 1122, the PMTUD RFCs and the TFO RFC)
 


  • Appendix = C.3: I really wonder why not to specify the algorithm with (optional) = persistence across reboots
 
Because it's the same as temporal sharing, just with = different averaging and information decay.
 


 
Editorial nits:
 
  • Please ensure that capitalization of all headlines = is consistent (e.g., title of Apendix A)
 
Done
 


  • Same for = all table captions (e.g., caption =E2=80=9EOption info=E2=80=9C)
 
Done.
 


  • Section 2: = I am not sure about this wording: s/permitted by TCP = implementers/permitted by TCP standards/ ???
 
Done (replaced as you suggest).
 


  • In the = table on Section 5, =E2=80=9Eround-trip time and variance=E2=80=9C = appears twice, is this a bug or a feature? (Same as in RFC 2140)
 
It's a bug. Removed.
 


  • Page 7 = refers to Appendix B. If that appendix shall indeed be removed prior to = publication, that reference also needs to be removed. Maybe that = sentence should be flagged for removal, too?!
 
Done.
 


  • On page 7 = and 8, I believe that the position of the tables could be rearranged so = that they are not rendered back-to-back. Both tables seem partly = unrelated and the current position may be a bit confusing. Same issue = later on page 10. (Alternatively, the tables could be numbered to make = clear that they are separate.)
 
Fixed: the tables are now clearer due to the new = subheadings.
 


  • On page 8, = the order of the entries in the table and the order of their explanation = is not well aligned. This may be a matter of personal taste, but I would = expect a somewhat similar order.
 
Fixed.
 


  • Page 8/9: =E2=80=9EThe= method for merging old and current values needs to attempt to reduce = the transient for new connections.=E2=80=9C I am not sure if I fully = understand what is meant by this (albeit I suspect a certain = meaning).
 
Clarified.
 
 
  • Page 9: The table in the upper part of the page is = not explained. I think it would make sense to have at least one sentence = to introduce it.
 
This is fixed by the newly introduced subheadings which = clarify that some tables are for initialization and some for cache = updates.
 


  • Page 11: = The position of the table confuses me.
 
Fixed.
 
 
Best Regards,
Joe, Michael and Safiqul
 

= --Apple-Mail=_FF64B538-F0D5-449B-9976-4D296C194266-- From nobody Thu Mar 12 11:59:08 2020 Return-Path: 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 859683A105D for ; Thu, 12 Mar 2020 11:58:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham 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 yMraiNp9FoAE for ; Thu, 12 Mar 2020 11:58:55 -0700 (PDT) Received: from cl3.bcs-hosting.net (cl3.bcs-hosting.net [3.11.37.202]) (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 0A9E73A0FC0 for ; Thu, 12 Mar 2020 11:58:54 -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=hVoc5IZri8jfL8vkT8pYsFg95mFhMik8ZhBre5sz6H8=; b=ybeZJLgrevP3RM7UL2Qii6reh KdC1xmxcJ80N8eQtFJV9nBbKBi1LE/veOVaxDmz1saHIg9c99dSUuDyeBgsyzw8ilj62xnTv8EBK1 TaIzBc1BklHpSE5YXo8Zt87Kw9EpKm4Z4plrkn03XQczRfxXyFl+9h8m9qaNBAo6GlmbyEMsZ1JVK eOQ9HEFu6AlceJuHSe1xDo6nsOC+xtMVqoVv05zdxt+AhtJh7zYJ6uMUlWq2NQ0cv1mPmN1W35K8y Z13MSqhrowQcGxxppAobagbdf5b3c1bKwEFz1Z/ShiLf7zyJCfC5FedxAOj7BSkiwlBOEjvfd/Rij IZ+SbiYRA==; Received: from [31.185.135.141] (port=33380 helo=[192.168.0.4]) by cl3.bcs-hosting.net with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1jCT2h-00DcF3-LR; Thu, 12 Mar 2020 18:58:52 +0000 To: "Scharf, Michael" , tcpm IETF list Cc: Richard Scheffenegger , Mirja Kuehlewind References: <6EC6417807D9754DA64F3087E2E2E03E2D9CA5C4@rznt8114.rznt.rzdir.fht-esslingen.de> <6EC6417807D9754DA64F3087E2E2E03E2D9D2380@rznt8114.rznt.rzdir.fht-esslingen.de> From: Bob Briscoe Message-ID: <398428e9-6796-6940-7e0d-b67eced4e862@bobbriscoe.net> Date: Thu, 12 Mar 2020 18:58:50 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <6EC6417807D9754DA64F3087E2E2E03E2D9D2380@rznt8114.rznt.rzdir.fht-esslingen.de> Content-Type: multipart/alternative; boundary="------------911F448925DA88B77821D24A" Content-Language: en-GB X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cl3.bcs-hosting.net 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: cl3.bcs-hosting.net: authenticated_id: in@bobbriscoe.net X-Authenticated-Sender: cl3.bcs-hosting.net: in@bobbriscoe.net X-Source: X-Source-Args: X-Source-Dir: Archived-At: Subject: Re: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-ecn-11.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2020 18:59:07 -0000 This is a multi-part message in MIME format. --------------911F448925DA88B77821D24A Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Michael, On 10/03/2020 23:27, Scharf, Michael wrote: > > Bob, > > Out of my head, I am not aware of any IETF protocol that uses TLV > encoding with ambiguous message formats, i.e., message with the same > type but different message formats depending on earlier messages. For > instance, this can easily get messy during debugging. And a protocol > that is hard to debug is **not robust** in my point of view. > I understand that the highest bit solution is not ideal. I am merely pushing back on the notion that it is completely unacceptable. > I have already pointed out that IMHO a tool like Wireshark cannot > correctly decode the option for a partial PCAP trace. The same applies > to any passive monitoring tool that uses sampling. This has > significant operational impact. Well, your mileage may vary, but I see > no value in obscuring the counters by an unorthodox encoding that > requires keeping state to figure out what the option format actually is. > > And I am not a hardware expert, but if AccECN should really be > sucessful, hardware offloading in NICs will probably matter in future. > Thus, the length of options is not the only tradeoff to be considered > to make the protocol sucessful. As far as I understand, simple > stateless message formats help a lot when it comes to hardware offloading. > That was indeed why we originally had a fixed field order. I proposed two alternative ways to allow different field orders: a) two option kinds or b) first counter bit. The WG chose the first counter bit, so I wrote it up. I just wish this WG would make up its mind, and have some discipline so that people know in advance that a decision will not be reversed at the next meeting. Then people know that they have to stop reading their email and really think carefully before making a decision. > It is well understood that many implementers may try to avoid the > option altogether. An unorthodox encoding will almost certainly not > help to get the option widely deployed. > > Just to repeat myself, if I had to pick between the current proposal > in -11 and two different option codepoints, I would go for the latter. > We have >150 TCP option codepoints left. That resource is not so > scarce after all. I fail to see any real-world benefit of the proposal > in -11 as compared to two separate codepoints. > > In a nutshell, I believe you should look for an option design that can > be processed by a stateless decoder. In other words, KISS. There are > plenty of ways how to do that, and adding a byte is only one of them. > I have already mentioned several other alternatives, and probably > there are more (e.g., one could use a 2-bit type field for each > counter to identify it). All of them seem **simpler** to me than the > current proposal in -11. > > To me, this idea in -11 **is broken** and this should be fixed in -12. > I don't think you have answered my questions sufficiently to make such a claim. You have given examples of cases where 3rd party monitoring will get confused. But calling that "broken" is, I think, an overstatement. How does the protocol itself /break/? You have said it doesn't allow the order to be changed mid connection. But that is not "broken". That is a feature that I'm not convinced is needed. If the occasional connection would have made more efficient use of 3B of option space if it had been able to switch to a different field order, is that worth the extra complexity? That is what I was getting at from my questions: What is actually "not robust / broken" about it? In what case(s) can it fail? Have you proved these problems exist (whether paper proof or empirical)? What I don't want to happen (again) is that the WG swings to yet another solution, before a proper case has been made for the need to do so. Bob > Michael > > *Von: *Bob Briscoe > *Gesendet: *Dienstag, 10. Mrz 2020 23:00 > *An: *Scharf, Michael ; tcpm > IETF list > *Cc: *Richard Scheffenegger ; > Mirja Kuehlewind > *Betreff: *Re: [tcpm] New Version Notification for > draft-ietf-tcpm-accurate-ecn-11.txt > > Michael, > > I agree extensibility is nice. And I'm open to a design with a 1 octet > field immediately after the length field, for flags and the like. In > fact, I encouraged Ilpo to put his idea to the list (which he had put > to be offlist). But let's be disciplined about this if we're going to > start down this road... > > 1) This is not the time for "it would be nice if". I want to go back > to your original email and ask you to be much more specific about the > problems envisaged. I agree the idea of switching field order based on > the first bit is unorthodox, but what is actually "not robust" about > it? In what case(s) can it fail? Have you proved these problems exist > (whether paper proof or empirical)? > > 2) We have a very *inextensible* lack of TCP option space to deal > with. And we don't know what other important options might be invented > in future. So we shouldn't burn even a single byte unless we have good > reason to. Extensibility is good. But it does burn space. > > 3) I haven't asked my co-authors, but I know that Mirja wanted the > design to be as simple as possible, and now we're moving away from that. > > If it ain't broken don't fix it. > > > > Bob > > On 09/03/2020 20:00, Scharf, Michael wrote: >> >> With chair hat off, I really wonder if the solution to encode the two >> different orders in the TCP Option is an example for good and robust >> protocol engineering. >> >> For instance, the current design makes it hard to decode the field in >> a monitoring tool (such as Wireshark). Also, as far as I understand, >> it does not allow to switch the encoding during a connection, which >> limits flexibility. We almost certainly do not understand **now** all >> future use cases of this Standard. >> >> Unless I miss something, there would be several other solutions: >> >> First, IMHO, we have enough TCP option codepoints left to spend two >> codepoints if there is a good reason for doing so. As compared to the >> current design proposal in -10/-11, spending two different option >> kinds would look to me like **much** better protocol engineering. >> >> Second, if the TCPM community insists in only one option kind >> codepoint for whatever reason, IMHO one could add one sub-type byte >> to the option. The TCP Option field has to be multiples of 4 byte, >> i.e., if a segment only contains a 11 byte AccECN TCP option, an >> additional NOP TCP option is needed for padding, no? So, what >> downside have 12 bytes as compared to 11 bytes? For the shorter >> variants, the overhead of a sub-type field increases, but it may >> still be within reasonable limits. What do I miss? >> >> Third, one could use different lengths for the different orders, >> e.g., lenths 5/8/11 for type 0 and 6/9/12 for type 12. Is this not >> possible? >> >> In all these cases, the resulting protocol looks simpler and more >> robust to me. What prevents us from using the KISS principle? >> >> Michael >> >> *Von: *Bob Briscoe >> *Gesendet: *Freitag, 6. Mrz 2020 04:34 >> *An: *tcpm IETF list >> *Cc: *Richard Scheffenegger >> ; Mirja Kuehlewind >> >> *Betreff: *Re: [tcpm] New Version Notification for >> draft-ietf-tcpm-accurate-ecn-11.txt >> >> tcpm, >> >> You will have seen draft-10 then draft-11 in quick succession, as >> already explained. >> The diffs from draft-09 to -10 were those that had built up since Jul'19. >> The diffs from draft-10 to -11 were solely those for the change from >> EXP track to STD track. >> Draft-10 doesn't seem to display in the list of links to each >> version, but you can manually write the URL. >> >> The main technical changes in draft-10 were numerous - many will be >> recognized from list discussion since Jul'19. >> Particular thanks to Ilpo Jrvinen who identified many niggles (and >> their solutions) while writing and testing a full Linux >> implementation (based on Olivier Tilmans's, in turn based on Mirja's). >> >> * Allowed 2 different orders of the fields in the AccECN Option >> * Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also >> on first data packet >> o greatly simplifies implementation, esp with TFO. >> o repeating on first data packet was for reliable delivery, >> which is now achieved with ACE counter (see next bullet) >> * Increment the ACE counter if CE on SYN/ACK (but still not if CE >> on SYN) >> o Reliable delivery of feedback of CE on SYN/ACK >> * Redefine 'first packet' as first to arrive, not first in sequence >> in 2 cases: >> o Handshake reflection on the ACK of the SYN/ACK >> o In the test for zeroing of ACE >> o Reason: greatly simplifies implementation >> * if ACE could have wrapped more than once, SHOULD assume safest >> likely case >> not "conservatively assume" it did cycle >> o Reason: avoid unnecessary hit on performance >> * More robustness (with flexibility) in rules for when to include >> an AccECN Option >> o Change-triggered AccECN Option as SHOULD, not MUST >> o SHOULD follow change-triggered AccECN Option with another >> (removes ambiguity if ACK thinning or loss) >> o when same counter continues to increment, SHOULD consistently >> include it every n ACKs >> o Made rule about precedence of SACK conditional (max 2 SACK >> blocks) >> o MAY exclude counters that have not changed for the whole >> connection >> * Allowed an AccECN server not to implement RFC3168 ECN (all >> clients still have to) >> * Precluded mixed capability negotiation from either end >> o reduces freedom to choose SYN & SYN/ACK fall-back strategies >> o to prevent cases where each end's outcome after handshake >> could be inconsistent (in reordering corner-cases) >> * Reserved the codepoint combination used by the historic nonce case >> * Merged in a number of points from RFC3168 that we hadn't covered >> o (a whole new subsection about obligations to do with ECN) >> * Explicit about checking "acceptable packets" >> o before counting their ECN markings or before counting the ECN >> feedback they carry >> * Required retransmitted Fallback SYN to use same ISN >> o allows servers to detect ECN downgrade SYN attacks >> * Handled corner cases like In-window SYN during TIME-WAIT >> >> >> >> Bob >> >> On 06/03/2020 02:24, internet-drafts@ietf.org >> wrote: >> >> >> >> A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt >> >> has been successfully submitted by Bob Briscoe and posted to the >> >> IETF repository. >> >> >> >> Name: draft-ietf-tcpm-accurate-ecn >> >> Revision: 11 >> >> Title: More Accurate ECN Feedback in TCP >> >> Document date: 2020-03-05 >> >> Group: tcpm >> >> Pages: 58 >> >> URL:https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accurate-ecn-11.txt >> >> Status:https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/ >> >> Htmlized:https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11 >> >> Htmlized:https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn >> >> Diff:https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-11 >> >> >> >> Abstract: >> >> Explicit Congestion Notification (ECN) is a mechanism where network >> >> nodes can mark IP packets instead of dropping them to indicate >> >> incipient congestion to the end-points. Receivers with an ECN- >> >> capable transport protocol feed back this information to the sender. >> >> ECN is specified for TCP in such a way that only one feedback signal >> >> can be transmitted per Round-Trip Time (RTT). Recent new TCP >> >> mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP) >> >> or Low Latency Low Loss Scalable Throughput (L4S) need more accurate >> >> ECN feedback information whenever more than one marking is received >> >> in one RTT. This document specifies a scheme to provide more than >> >> one feedback signal per RTT in the TCP header. Given TCP header >> >> space is scarce, it allocates a reserved header bit, that was >> >> previously used for the ECN-Nonce which has now been declared >> >> historic. It also overloads the two existing ECN flags in the TCP >> >> header. The resulting extra space is exploited to feed back the IP- >> >> ECN field received during the 3-way handshake as well. Supplementary >> >> feedback information can optionally be provided in a new TCP option, >> >> which is never used on the TCP SYN. >> >> >> >> >> >> >> >> >> >> Please note that it may take a couple of minutes from the time of submission >> >> until the htmlized version and diff are available at tools.ietf.org. >> >> >> >> The IETF Secretariat >> >> >> >> >> >> >> >> -- >> ________________________________________________________________ >> Bob Briscoehttp://bobbriscoe.net/ >> > > -- > ________________________________________________________________ > Bob Briscoehttp://bobbriscoe.net/ -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/ --------------911F448925DA88B77821D24A Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit Michael,

On 10/03/2020 23:27, Scharf, Michael wrote:

Bob,

Out of my head, I am not aware of any IETF protocol that uses TLV encoding with ambiguous message formats, i.e., message with the same type but different message formats depending on earlier messages. For instance, this can easily get messy during debugging. And a protocol that is hard to debug is *not robust* in my point of view.


I understand that the highest bit solution is not ideal. I am merely pushing back on the notion that it is completely unacceptable.

I have already pointed out that IMHO a tool like Wireshark cannot correctly decode the option for a partial PCAP trace. The same applies to any passive monitoring tool that uses sampling. This has significant operational impact. Well, your mileage may vary, but I see no value in obscuring the counters by an unorthodox encoding that requires keeping state to figure out what the option format actually is.

And I am not a hardware expert, but if AccECN should really be sucessful, hardware offloading in NICs will probably matter in future. Thus, the length of options is not the only tradeoff to be considered to make the protocol sucessful. As far as I understand, simple stateless message formats help a lot when it comes to hardware offloading.

That was indeed why we originally had a fixed field order.

I proposed two alternative ways to allow different field orders: a) two option kinds or b) first counter bit.
The WG chose the first counter bit, so I wrote it up.

I just wish this WG would make up its mind, and have some discipline so that people know in advance that a decision will not be reversed at the next meeting. Then people know that they have to stop reading their email and really think carefully before making a decision.


It is well understood that many implementers may try to avoid the option altogether. An unorthodox encoding will almost certainly not help to get the option widely deployed.

Just to repeat myself, if I had to pick between the current proposal in -11 and two different option codepoints, I would go for the latter. We have >150 TCP option codepoints left. That resource is not so scarce after all. I fail to see any real-world benefit of the proposal in -11 as compared to two separate codepoints.

In a nutshell, I believe you should look for an option design that can be processed by a stateless decoder. In other words, KISS. There are plenty of ways how to do that, and adding a byte is only one of them. I have already mentioned several other alternatives, and probably there are more (e.g., one could use a 2-bit type field for each counter to identify it). All of them seem *simpler* to me than the current proposal in -11.

To me, this idea in -11 *is broken* and this should be fixed in -12.

I don't think you have answered my questions sufficiently to make such a claim. You have given examples of cases where 3rd party monitoring will get confused. But calling that "broken" is, I think, an overstatement. How does the protocol itself /break/?

You have said it doesn't allow the order to be changed mid connection. But that is not "broken". That is a feature that I'm not convinced is needed. If the occasional connection would have made more efficient use of 3B of option space if it had been able to switch to a different field order, is that worth the extra complexity?

That is what I was getting at from my questions: What is actually "not robust / broken" about it? In what case(s) can it fail? Have you proved these problems exist (whether paper proof or empirical)?

What I don't want to happen (again) is that the WG swings to yet another solution, before a proper case has been made for the need to do so.


Bob

Michael

Von: Bob Briscoe
Gesendet: Dienstag, 10. Mrz 2020 23:00
An: Scharf, Michael; tcpm IETF list
Cc: Richard Scheffenegger; Mirja Kuehlewind
Betreff: Re: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-ecn-11.txt

Michael,

I agree extensibility is nice. And I'm open to a design with a 1 octet field immediately after the length field, for flags and the like. In fact, I encouraged Ilpo to put his idea to the list (which he had put to be offlist). But let's be disciplined about this if we're going to start down this road...

1) This is not the time for "it would be nice if". I want to go back to your original email and ask you to be much more specific about the problems envisaged. I agree the idea of switching field order based on the first bit is unorthodox, but what is actually "not robust" about it? In what case(s) can it fail? Have you proved these problems exist (whether paper proof or empirical)?

2) We have a very *inextensible* lack of TCP option space to deal with. And we don't know what other important options might be invented in future. So we shouldn't burn even a single byte unless we have good reason to. Extensibility is good. But it does burn space.

3) I haven't asked my co-authors, but I know that Mirja wanted the design to be as simple as possible, and now we're moving away from that.

If it ain't broken don't fix it.



Bob

On 09/03/2020 20:00, Scharf, Michael wrote:

With chair hat off, I really wonder if the solution to encode the two different orders in the TCP Option is an example for good and robust protocol engineering.

For instance, the current design makes it hard to decode the field in a monitoring tool (such as Wireshark). Also, as far as I understand, it does not allow to switch the encoding during a connection, which limits flexibility. We almost certainly do not understand *now* all future use cases of this Standard.

Unless I miss something, there would be several other solutions:

First, IMHO, we have enough TCP option codepoints left to spend two codepoints if there is a good reason for doing so. As compared to the current design proposal in -10/-11, spending two different option kinds would look to me like *much* better protocol engineering.

Second, if the TCPM community insists in only one option kind codepoint for whatever reason, IMHO one could add one sub-type byte to the option. The TCP Option field has to be multiples of 4 byte, i.e., if a segment only contains a 11 byte AccECN TCP option, an additional NOP TCP option is needed for padding, no? So, what downside have 12 bytes as compared to 11 bytes? For the shorter variants, the overhead of a sub-type field increases, but it may still be within reasonable limits. What do I miss?

Third, one could use different lengths for the different orders, e.g., lenths 5/8/11 for type 0 and 6/9/12 for type 12. Is this not possible?

In all these cases, the resulting protocol looks simpler and more robust to me. What prevents us from using the KISS principle?

Michael

Von: Bob Briscoe
Gesendet: Freitag, 6. Mrz 2020 04:34
An: tcpm IETF list
Cc: Richard Scheffenegger; Mirja Kuehlewind
Betreff: Re: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-ecn-11.txt

tcpm,

You will have seen draft-10 then draft-11 in quick succession, as already explained.
The diffs from draft-09 to -10 were those that had built up since Jul'19.
The diffs from draft-10 to -11 were solely those for the change from EXP track to STD track.
Draft-10 doesn't seem to display in the list of links to each version, but you can manually write the URL.

The main technical changes in draft-10 were numerous - many will be recognized from list discussion since Jul'19.
Particular thanks to Ilpo Jrvinen who identified many niggles (and their solutions) while writing and testing a full Linux implementation (based on Olivier Tilmans's, in turn based on Mirja's).

  • Allowed 2 different orders of the fields in the AccECN Option
  • Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also on first data packet
    • greatly simplifies implementation, esp with TFO.
    • repeating on first data packet was for reliable delivery, which is now achieved with ACE counter (see next bullet)
  • Increment the ACE counter if CE on SYN/ACK (but still not if CE on SYN)
    • Reliable delivery of feedback of CE on SYN/ACK
  • Redefine 'first packet' as first to arrive, not first in sequence in 2 cases:
    • Handshake reflection on the ACK of the SYN/ACK
    • In the test for zeroing of ACE
    • Reason: greatly simplifies implementation
  • if ACE could have wrapped more than once, SHOULD assume safest likely case
    not "conservatively assume" it did cycle
    • Reason: avoid unnecessary hit on performance
  • More robustness (with flexibility) in rules for when to include an AccECN Option
    • Change-triggered AccECN Option as SHOULD, not MUST
    • SHOULD follow change-triggered AccECN Option with another (removes ambiguity if ACK thinning or loss)
    • when same counter continues to increment, SHOULD consistently include it every n ACKs
    • Made rule about precedence of SACK conditional (max 2 SACK blocks)
    • MAY exclude counters that have not changed for the whole connection
  • Allowed an AccECN server not to implement RFC3168 ECN (all clients still have to)
  • Precluded mixed capability negotiation from either end
    • reduces freedom to choose SYN & SYN/ACK fall-back strategies
    • to prevent cases where each end's outcome after handshake could be inconsistent (in reordering corner-cases)
  • Reserved the codepoint combination used by the historic nonce case
  • Merged in a number of points from RFC3168 that we hadn't covered
    • (a whole new subsection about obligations to do with ECN)
  • Explicit about checking "acceptable packets"
    • before counting their ECN markings or before counting the ECN feedback they carry
  • Required retransmitted Fallback SYN to use same ISN
    • allows servers to detect ECN downgrade SYN attacks
  • Handled corner cases like In-window SYN during TIME-WAIT



Bob

On 06/03/2020 02:24, internet-drafts@ietf.org wrote:


              
A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt

              
has been successfully submitted by Bob Briscoe and posted to the

              
IETF repository.

              

              
Name: draft-ietf-tcpm-accurate-ecn

              
Revision: 11

              
Title: More Accurate ECN Feedback in TCP

              
Document date: 2020-03-05

              
Group: tcpm

              
Pages: 58

              
URL: https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accurate-ecn-11.txt

              
Status: https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/

              
Htmlized: https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11

              
Htmlized: https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn

              
Diff: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-11

              

              
Abstract:

              
 Explicit Congestion Notification (ECN) is a mechanism where network

              
 nodes can mark IP packets instead of dropping them to indicate

              
 incipient congestion to the end-points. Receivers with an ECN-

              
 capable transport protocol feed back this information to the sender.

              
 ECN is specified for TCP in such a way that only one feedback signal

              
 can be transmitted per Round-Trip Time (RTT). Recent new TCP

              
 mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP)

              
 or Low Latency Low Loss Scalable Throughput (L4S) need more accurate

              
 ECN feedback information whenever more than one marking is received

              
 in one RTT. This document specifies a scheme to provide more than

              
 one feedback signal per RTT in the TCP header. Given TCP header

              
 space is scarce, it allocates a reserved header bit, that was

              
 previously used for the ECN-Nonce which has now been declared

              
 historic. It also overloads the two existing ECN flags in the TCP

              
 header. The resulting extra space is exploited to feed back the IP-

              
 ECN field received during the 3-way handshake as well. Supplementary

              
 feedback information can optionally be provided in a new TCP option,

              
 which is never used on the TCP SYN.

              

              
 

              

              

              
Please note that it may take a couple of minutes from the time of submission

              
until the htmlized version and diff are available at tools.ietf.org.

              

              
The IETF Secretariat

              

              

            

            


              

            

            
-- 

            
________________________________________________________________

            
Bob Briscoe http://bobbriscoe.net/

            

          

        

        

        
-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/

      

    

    

    
-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/

  


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To: Jonathan Morton 
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Jonathan,

Reminder: In Nov'19,  I carefully unpicked the descriptions of all the 
ideas in your draft, asking questions on the list where necessary, and 
provided a detailed review of whether it does what it says it aims to do 
(setting aside whether I agree with what it aims to do).
https://mailarchive.ietf.org/arch/msg/tcpm/Mbdoh-GZCO_fc6e-84ORCKk75-w/
The draft hasn't been updated since.

The draft contains four tentative ideas for different semantics for the 
proposed feedback. There isn't any mechanism for negotiating which 
scheme to use, so I assume the intent is to eventually choose one.

The draft said more assessment was needed of each. It rejected one idea 
itself. I analyzed the other three, and concluded that they all had 
major problems. I spent some time structuring my review to make it easy 
to follow and included an exec summary and table assessing each idea 
against the goals given in the draft.

You were going to "examine my arguments in detail".

Cheers



Bob

On 16/11/2019 00:59, Bob Briscoe wrote:
> Jonathan,
>
> I did ask you not to reply until you've read the review. The reasoning 
> against what you've said below is in the review.
>
> What you say (which you wouldn't say if you'd read the review) is only 
> true for long-term stable traffic. But the Internet is hardly ever 
> like that.
>
> We need to see the delay from SCE at higher percentiles, which 
> determines whether interactive applications will experience an 
> improvement. If you don't make a significant improvement in 
> /consistency/ of delay, there's no point burning codepoints. To 
> measure that requires hundred's of thousands of data samples. Not just 
> a few time series plots and plots of averaged Q delay. We have 
> provided tools to extract all this, and we shall be making them easier 
> to use during the Hackathon.
>
> Briefly repeating what I've already said (sigh):
> To ensure delay is /consistently/ very low under dynamic conditions 
> (e.g. for real-time interactive applications), accuracy and timeliness 
> in the feedback loop is critical.
>
> With inaccurate feedback the set point that the congestion control is 
> aiming for is incorrect, so the rate it aims for is either too high 
> (->qdelay) or too low (->under-utilization). Yes, given enough time 
> (under stable conditions), as it heads towards the wrong point, 
> congestion will rise higher (or fall lower) than the error, and it 
> will head closer to the correct point, but still aiming for the wrong 
> target (the right target but with the latest feedback errors (+/-) 
> added).
>
> In addition, the review explains why all the schemes in the tcpsce 
> draft give an inherently more biased error the higher the level of 
> congestion. Biased error is much more problematic.
>
>
>
> Bob
>
> PS. Pls do not reply again without having taken the trouble to read 
> what I have spent a lot of time explaining.
>
>
> On 15/11/2019 23:28, Jonathan Morton wrote:
>>> On 16 Nov, 2019, at 1:59 am, Bob Briscoe  wrote:
>>>
>>> Why go through all the years of pain of altering the TCP wire 
>>> protocol for an accurate feedback scheme that isn't accurate?
>> Without delving into the rest of the detail right now, I'd like to 
>> address this point immediately.
>>
>> Congestion control is, ultimately, a system with a control loop under 
>> negative feedback.  When designing such a control loop, one is 
>> generally concerned with whether it has sufficient gain to converge 
>> on the appropriate setpoint, and is acceptably stable.  The nature of 
>> the feedback path feeds into that analysis, but as long as the result 
>> meets acceptability criteria, a simpler control system is often 
>> preferable.  One fundamental property of a negative-feedback system, 
>> though, is that the system returns towards the setpoint after a 
>> disturbance, even that disturbance occurred *in* the feedback path.
>>
>> Consequently, SCE can tolerate as much as 100% relative error in the 
>> SCE feedback path.  The case of being 100% low - no ESCE feedback 
>> received at all - corresponds to falling back to RFC-3168 compliant 
>> behaviour, ie. the MD response to CE acts as a ceiling on the 
>> positive excursion of the control output (cwnd).  The case of being 
>> 100% high - twice as much ESCE feedback received as SCE marks were 
>> applied on the forward path - will cause a low excursion which will 
>> drain the affected queue, after which SCE marking will stop, and the 
>> system will then recover.
>>
>> Consequently we made the design decision that *reliable* accurate 
>> feedback was not necessary, nor was the associated complexity 
>> desirable.  We also observed that a single additional bit per 
>> received segment was always adequate to convey *accurate* feedback, 
>> and that usually fewer bits were needed, which fits well with using 
>> one spare bit per Delayed ACK packet - which is what we do here.  
>> Several such bits are available in the TCP header for such uses, and 
>> we decided to recommend the use of one which had recently been freed 
>> up and whose previous use was closely related.
>>
>> Without yet having examined your other arguments in detail, I suspect 
>> you are misunderstanding how some of our proposed feedback methods 
>> work in practice, perhaps stemming from the above fallacy.  
>> Understand that we have actually implemented each of these methods in 
>> running code, and can demonstrate their operation at the Hackathon.
>>
>> See you there.
>>
>>   - Jonathan Morton
>>
>

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/


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From: Jonathan Morton 
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Subject: Re: [tcpm] Tech review of draft-grimes-tcpm-tcpsce-01.txt
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> On 13 Mar, 2020, at 2:03 am, Bob Briscoe  wrote:
>=20
> Reminder: In Nov'19,  I carefully unpicked the descriptions of all the =
ideas in your draft, asking questions on the list where necessary, and =
provided a detailed review of whether it does what it says it aims to do =
(setting aside whether I agree with what it aims to do).
> =
https://mailarchive.ietf.org/arch/msg/tcpm/Mbdoh-GZCO_fc6e-84ORCKk75-w/
> The draft hasn't been updated since.
>=20
> The draft said more assessment was needed of each. It rejected one =
idea itself. I analyzed the other three, and concluded that they all had =
major problems. I spent some time structuring my review to make it easy =
to follow and included an exec summary and table assessing each idea =
against the goals given in the draft.
>=20
> You were going to "examine my arguments in detail".

Which we did, and concluded there wasn't a way (at that time) of =
answering your points in detail without sparking a massive and =
counterproductive flamewar.  So I'm not going to do that, but I have =
managed to extract a few salient points which I *can* address.

> The draft contains four tentative ideas for different semantics for =
the proposed feedback. There isn't any mechanism for negotiating which =
scheme to use, so I assume the intent is to eventually choose one.

Your assumption would be incorrect.

SCE is designed to accommodate flexibility in several areas, including =
the precise algorithms used to control the send rate, marking schedule, =
and feedback.  This draft, of course, covers the feedback.  Any =
algorithm which succeeds in reflecting the received SCE marks as ESCE =
flags with reasonable accuracy is acceptable.  The draft describes =
several such algorithms and tries to characterise their relative =
advantages, including the extent to which they maintain a desired =
Delayed Ack ratio.

The scheme actually implemented in our Linux-based reference code is the =
fourth algorithm, labelled Advanced.  This precisely matches segments' =
marks with their acks' flags, while still permitting Delayed Acks to =
function at both low and high marking ratios.  Really, this is the =
ideal.  The other schemes were proposed as being potentially easier to =
implement in some TCP stacks, with lesser performance.  (We might delete =
the Dithered scheme from a future version.)

Ack thinning, as you describe it, is something that happens on the =
reverse path, after the ack stream has left the receiver.  SCE's =
feedback scheme in TCP is unreliable, so naive ack thinning (that is, =
discarding acks without considering the potential loss of information in =
flags and/or options) can indeed lead to a temporary bias in the =
feedback signal as seen at the sender.  Acks can also be lost for other =
reasons, such as AQM action in the event of congestion, and this would =
have a similar effect in principle.

The important point is that SCE can tolerate this because the control =
loop remains closed, even if the feedback signal becomes systematically =
biased.  The AQM at the bottleneck is part of that control loop; it will =
adjust the marking rate as much as is needed to control the queue.  So =
even if the signal is so heavily biased by thinning that it appears to =
saturate at 100% or 0%, the system will be driven to a state where that =
bias is reduced, or even becomes impossible because it has reached 0% or =
100% respectively.

This is part of what we mean when we say that SCE can tolerate a 100% =
relative error in the feedback.  The other part is that even if ESCE =
feedback fails entirely, we have a built-in failsafe in the form of CE =
marks and the reliable ECE/CWR feedback mechanism, as defined in =
RFC-3168.  This would cause a Multiplicative Decrease, which might =
technically be overkill for the actual congestion situation, but is =
conservative and safe.

So the result is a system of minimal complexity that can be implemented =
easily, requires minimal resources (one spare header bit) on the wire, =
and achieves closed-loop control even under less than ideal network =
conditions.

This is engineering, not an ivory tower.

As a final point, there is in fact a way to perform Ack Thinning which =
preserves nearly all of the information in the lost acks, by being =
selective about which acks are actually dropped.  This does require more =
careful inspection of consecutive acks, to see if the information in the =
first is adequately reflected in the information present in the second.  =
An example implementation of this is found in net/sched/sch_cake.c in =
our reference codebase, and completely avoids the bias effects that you =
postulate.

 - Jonathan Morton


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From: Joseph Touch 
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Date: Fri, 13 Mar 2020 08:24:18 -0700
Cc: "Scharf, Michael" , tcpm IETF list , "draft-ietf-tcpm-2140bis@ietf.org" 
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Subject: Re: [tcpm] draft-ietf-tcpm-2140bis-01
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FYI - I have -02 already in prep and added the item below.

Joe

> On Mar 12, 2020, at 9:26 AM, Michael Welzl  wrote:
>=20
>=20
>=20
>> On Mar 12, 2020, at 4:23 PM, Scharf, Michael =
> =
wrote:
>>=20
>> Hi Michael,
>> =20
>> Thanks a lot for the update. Indeed, the organization of the content =
has improved a lot.
>> =20
>> A small editorial nit: s/TCP/TCB/ in =E2=80=9E6.2. Updates to the new =
TCP=E2=80=9C?
>=20
> Oops  :)   sure!
>=20
> =20
>> With chair hat on: I will try to find at least one other reviewer for =
this document. And a heads-up to the community: A WGLC is planned within =
the next few months, subject to the constraint that there shall be not =
too many parallel WGLCs in TCPM.
>> =20
>> Thanks
>=20
> Thanks to you!
>=20
> Cheers,
> Michael
>=20
>=20
>> =20
>> Michael
>> =20
>> =20
>> =20
>> Von: Michael Welzl 
>> Gesendet: Samstag, 29. Februar 2020 23:59
>> An: Scharf, Michael 
>> Cc: draft-ietf-tcpm-2140bis@ietf.org =
; tcpm IETF list =

>> Betreff: Re: [tcpm] draft-ietf-tcpm-2140bis-01
>> =20
>> Hi Michael,=20
>> =20
>> We have now addressed your comments (please see below).
>>=20
>>=20
>> Begin forwarded message:
>> =20
>> From: "Scharf, Michael" >
>> Subject: draft-ietf-tcpm-2140bis-01
>> Date: 30 January 2020 at 01:28:50 CET
>> To: "draft-ietf-tcpm-2140bis@ietf.org =
" =
>, tcpm IETF list =
>
>> Resent-From: >
>> Resent-To: >, =
>, >
>> =20
>> Hi,
>> =20
>> I have read the most recent version of 2140bis. As usually, my =
comments are posted with chair hat off.
>> =20
>> I encourage others to also read the document.
>> =20
>> Issues / comments:
>> =20
>> The document structure follows in many cases exactly RFC 2140, even =
if content has changed. In some cases, this confuses me. For instance, =
the Section =E2=80=9EAn Ensample of Temporal Sharing=E2=80=9C in RFC =
2140 indeed contained an implementation example. Section 6 of RFC =
2140bis is generic. This raises at least two questions f=C3=BCr Section =
6 and similarly for Section 7:
>> 1.       Is the title for the section still appropriate?
>> =20
>> Good catch, thanks! It isn't. Fixed it to "Temporal Sharing" (and =
"Ensemble Sharing" in case of Section 7).
>> =20
>> =20
>> 2.       Is some additional explanation needed e.g. on page 6 that an =
implementation can decide to implement only subsets of the table on page =
6, as an early heads-up?
>> =20
>> We don't make a recommendations for implementers but just present the =
possibilities with their pro's and con's; hence the text points at =
sections 8 and 9 for compatibility issues and implications of sharing =
the information. Thus, we believe that's the most appropriate type of =
"early heads-up".
>> =20
>>=20
>>=20
>> Sections 6, 7, 8, 9 and 10 are longer than the original 2140. I =
wonder if subsections would be useful to better structure them. At least =
I find some of the long text blocks hard to read and it is not always =
apparent how a given paragraph fits into the overall storyline. I =
suspect that the document would be easier to parse with some more =
structuring (e.g., subsections).
>> =20
>> We inserted sub-headings in Sections 6, 7, 8 and 9. This was great =
advice indeed! This should be much clearer now, especially sections 6 =
and 7.
>> =20
>>=20
>>=20
>> The internal structure of Section 8 is hard to understand. For =
instance, ECMP and LAG are discussed twice. Also, this section discusses =
quite a number of different aspects, including fairness, challenges with =
ECMP/LAG, interactions with fast recovery and NAT. I suggest to either =
add early an explanation what is meant by =E2=80=9Ecompatibility=E2=80=9C,=
 or to use sub-sections to make clear what topics are in scope (see =
above).
>> =20
>> We have re-organized the text here a bit, removing a redundant =
statement about ECMP and LAG, and inserted sub-headings in Section 8.
>> =20
>>=20
>>=20
>> The separation of topics between Section 8 and 9 is not fully clear =
to me (different to RFC 2140 =E2=80=93 prior to deployment these =
sections had a relatively clear meaning). For instance, both sections =
discuss traffic with possibly short flows (e.g., http). I think the =
existing content could be reorganized by copy&paste in sections with a =
well-defined focus. Example section titles could be:
>> Fairness issues
>> Impact on applications and performance
>> Interactions with network mechanism
>> Discussion of design aspects and alternatives
>> =E2=80=A6 (or other terms =E2=80=93 I just post this list to =
illustrate that alternatives could exist)
>> =20
>> =20
>> 8 are issues local to the TCB sharing function; 9 are interactions =
with other architecture and protocol issues. Although the sum of the two =
sections could be completely revised, we don't currently see a benefit.
>> =20
>>=20
>>=20
>> The table on page 15 is a bit dated. I hope that we could update =
that, say, during a WGLC
>> =20
>> We believe that the best approach is to copy+paste this table into an =
email and send it to the mailing list for checking. We'll do this.
>> =20
>>=20
>>=20
>> Section 12: I am not sure if I fully understand the attack vectors =
section. For instance, how would an attack like =E2=80=9Ean application =
can open a connection and set its window size to zero, denying service =
to any other subsequent connection between those hosts.=E2=80=9C work if =
the receive window is not shared?
>> =20
>> We agree, this was wrong; we removed this line.
>> =20
>>=20
>>=20
>> In addition, I wonder if privacy needs to be discussed, e.g., whether =
user tracking or fingerprinting is possible by the methods discussed in =
the document.
>> =20
>> Added a paragraph to the security section addressing this. We believe =
the mixing mitigates the effect of reuse.
>> =20
>> =20
>> Section 14: I would classify more references as =E2=80=9Enormative=E2=80=
=9C (e.g., RFC 793)
>> =20
>> Done (RFC 793, 1122, the PMTUD RFCs and the TFO RFC)
>> =20
>>=20
>>=20
>> Appendix C.3: I really wonder why not to specify the algorithm with =
(optional) persistence across reboots
>> =20
>> Because it's the same as temporal sharing, just with different =
averaging and information decay.
>> =20
>>=20
>>=20
>> =20
>> Editorial nits:
>> =20
>> Please ensure that capitalization of all headlines is consistent =
(e.g., title of Apendix A)
>> =20
>> Done
>> =20
>>=20
>>=20
>> Same for all table captions (e.g., caption =E2=80=9EOption info=E2=80=9C=
)
>> =20
>> Done.
>> =20
>>=20
>>=20
>> Section 2: I am not sure about this wording: s/permitted by TCP =
implementers/permitted by TCP standards/ ???
>> =20
>> Done (replaced as you suggest).
>> =20
>>=20
>>=20
>> In the table on Section 5, =E2=80=9Eround-trip time and variance=E2=80=9C=
 appears twice, is this a bug or a feature? (Same as in RFC 2140)
>> =20
>> It's a bug. Removed.
>> =20
>>=20
>>=20
>> Page 7 refers to Appendix B. If that appendix shall indeed be removed =
prior to publication, that reference also needs to be removed. Maybe =
that sentence should be flagged for removal, too?!
>> =20
>> Done.
>> =20
>>=20
>>=20
>> On page 7 and 8, I believe that the position of the tables could be =
rearranged so that they are not rendered back-to-back. Both tables seem =
partly unrelated and the current position may be a bit confusing. Same =
issue later on page 10. (Alternatively, the tables could be numbered to =
make clear that they are separate.)
>> =20
>> Fixed: the tables are now clearer due to the new subheadings.
>> =20
>>=20
>>=20
>> On page 8, the order of the entries in the table and the order of =
their explanation is not well aligned. This may be a matter of personal =
taste, but I would expect a somewhat similar order.
>> =20
>> Fixed.
>> =20
>>=20
>>=20
>> Page 8/9: =E2=80=9EThe method for merging old and current values =
needs to attempt to reduce the transient for new connections.=E2=80=9C I =
am not sure if I fully understand what is meant by this (albeit I =
suspect a certain meaning).
>> =20
>> Clarified.
>> =20
>> =20
>> Page 9: The table in the upper part of the page is not explained. I =
think it would make sense to have at least one sentence to introduce it.
>> =20
>> This is fixed by the newly introduced subheadings which clarify that =
some tables are for initialization and some for cache updates.
>> =20
>>=20
>>=20
>> Page 11: The position of the table confuses me.
>> =20
>> Fixed.
>> =20
>> =20
>> Best Regards,
>> Joe, Michael and Safiqul
>> =20
>=20
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpm


--Apple-Mail=_E94EAE27-1F7A-4755-AEED-F92EDD1A8794
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

FYI =
- I have -02 already in prep and added the item below.

Joe

On Mar =
12, 2020, at 9:26 AM, Michael Welzl <michawe@ifi.uio.no> =
wrote:



On Mar 12, 2020, at 4:23 PM, Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:

Hi =
Michael,
 
Thanks a =
lot for the update. Indeed, the organization of the content has improved =
a lot.
 
A small =
editorial nit: s/TCP/TCB/ in =E2=80=9E6.2. Updates to the new =
TCP=E2=80=9C?

Oops  :)   sure!

 
With =
chair hat on: I will try to find at least one other reviewer for this =
document. And a heads-up to the community: A WGLC is planned within the =
next few months, subject to the constraint that there shall be not too =
many parallel WGLCs in TCPM.
 
Thanks

Thanks to you!

Cheers,
Michael


 
Michael
 
 
 
Von: Michael Welzl
Gesendet: Samstag, 29. Februar =
2020 23:59
An: Scharf, Michael
Cc: draft-ietf-tcpm-2140bis@ietf.org; tcpm IETF list
Betreff: Re: [tcpm] =
draft-ietf-tcpm-2140bis-01
 
Hi Michael, 
 
We have now addressed your comments =
(please see below).


Begin forwarded message:
 
From: "Scharf, Michael" <Michael.Scharf@hs-esslingen.de>
Subject: draft-ietf-tcpm-2140bis-01
Date: 30 January 2020 at 01:28:50 =
CET
Resent-From: <alias-bounces@ietf.org>
 
Hi,
 
I have read the most recent version of =
2140bis. As usually, my comments are posted with chair hat off.
 
I encourage others to also read the =
document.
 
Issues / comments:
 
  • The document structure follows in many cases =
exactly RFC 2140, even if content has changed. In some cases, this =
confuses me. For instance, the Section =E2=80=9EAn Ensample of Temporal =
Sharing=E2=80=9C in RFC 2140 indeed contained an implementation example. =
Section 6 of RFC 2140bis is generic. This raises at least two questions =
f=C3=BCr Section 6 and similarly for Section 7:
1.       Is the title =
for the section still appropriate?
 
Good catch, thanks! It isn't. Fixed it to "Temporal Sharing" =
(and "Ensemble Sharing" in case of Section 7).
 
 
2.       Is some =
additional explanation needed e.g. on page 6 that an implementation can =
decide to implement only subsets of the table on page 6, as an early =
heads-up?
 
We don't make a recommendations for =
implementers but just present the possibilities with their pro's and =
con's; hence the text points at sections 8 and 9 for compatibility =
issues and implications of sharing the information. Thus, we believe =
that's the most appropriate type of "early heads-up".
 


  • Sections =
6, 7, 8, 9 and 10 are longer than the original 2140. I wonder if =
subsections would be useful to better structure them. At least I find =
some of the long text blocks hard to read and it is not always apparent =
how a given paragraph fits into the overall storyline. I suspect that =
the document would be easier to parse with some more structuring (e.g., =
subsections).
 
We inserted sub-headings in Sections 6, 7, 8 and 9. This was =
great advice indeed! This should be much clearer now, especially =
sections 6 and 7.
 


  • The =
internal structure of Section 8 is hard to understand. For instance, =
ECMP and LAG are discussed twice. Also, this section discusses quite a =
number of different aspects, including fairness, challenges with =
ECMP/LAG, interactions with fast recovery and NAT. I suggest to either =
add early an explanation what is meant by =E2=80=9Ecompatibility=E2=80=9C,=
 or to use sub-sections to make clear what topics are in scope (see =
above).
 
We have re-organized the text here a bit, removing a =
redundant statement about ECMP and LAG, and inserted sub-headings in =
Section 8.
 


  • The =
separation of topics between Section 8 and 9 is not fully clear to me =
(different to RFC 2140 =E2=80=93 prior to deployment these sections had =
a relatively clear meaning). For instance, both sections discuss traffic =
with possibly short flows (e.g., http). I think the existing content =
could be reorganized by copy&paste in sections with a well-defined =
focus. Example section titles could be:
  • Fairness =
issues
  • Impact on applications and performance
  • Interactions with network mechanism
  • Discussion of design aspects and alternatives
  • =E2=80=A6 (or other terms =E2=80=93 I just post this list =
to illustrate that alternatives could exist)
 
 
8 are issues local to the TCB sharing =
function; 9 are interactions with other architecture and protocol =
issues. Although the sum of the two sections could be completely =
revised, we don't currently see a benefit.
 


  • The table =
on page 15 is a bit dated. I hope that we could update that, say, during =
a WGLC
 
We believe that the best approach is to copy+paste this table =
into an email and send it to the mailing list for checking. We'll do =
this.
 


  • Section =
12: I am not sure if I fully understand the attack vectors section. For =
instance, how would an attack like =E2=80=9Ean application can open a =
connection and set its window size to zero, denying service to any other =
subsequent connection between those hosts.=E2=80=9C work if the receive =
window is not shared?
 
We agree, this was wrong; we removed this line.
 


  • In =
addition, I wonder if privacy needs to be discussed, e.g., whether user =
tracking or fingerprinting is possible by the methods discussed in the =
document.
 
Added a paragraph to the security =
section addressing this. We believe the mixing mitigates the effect of =
reuse.
 
 
  • Section 14: I would classify more references as =
=E2=80=9Enormative=E2=80=9C (e.g., RFC 793)
 
Done (RFC 793, 1122, the PMTUD RFCs and the TFO RFC)
 


  • Appendix =
C.3: I really wonder why not to specify the algorithm with (optional) =
persistence across reboots
 
Because it's the same as temporal sharing, just with =
different averaging and information decay.
 


 
Editorial nits:
 
  • Please ensure that capitalization of all headlines =
is consistent (e.g., title of Apendix A)
 
Done
 


  • Same for =
all table captions (e.g., caption =E2=80=9EOption info=E2=80=9C)
 
Done.
 


  • Section 2: =
I am not sure about this wording: s/permitted by TCP =
implementers/permitted by TCP standards/ ???
 
Done (replaced as you suggest).
 


  • In the =
table on Section 5, =E2=80=9Eround-trip time and variance=E2=80=9C =
appears twice, is this a bug or a feature? (Same as in RFC 2140)
 
It's a bug. Removed.
 


  • Page 7 =
refers to Appendix B. If that appendix shall indeed be removed prior to =
publication, that reference also needs to be removed. Maybe that =
sentence should be flagged for removal, too?!
 
Done.
 


  • On page 7 =
and 8, I believe that the position of the tables could be rearranged so =
that they are not rendered back-to-back. Both tables seem partly =
unrelated and the current position may be a bit confusing. Same issue =
later on page 10. (Alternatively, the tables could be numbered to make =
clear that they are separate.)
 
Fixed: the tables are now clearer due to the new =
subheadings.
 


  • On page 8, =
the order of the entries in the table and the order of their explanation =
is not well aligned. This may be a matter of personal taste, but I would =
expect a somewhat similar order.
 
Fixed.
 


  • Page 8/9: =E2=80=9EThe=
 method for merging old and current values needs to attempt to reduce =
the transient for new connections.=E2=80=9C I am not sure if I fully =
understand what is meant by this (albeit I suspect a certain =
meaning).
 
Clarified.
 
 
  • Page 9: The table in the upper part of the page is =
not explained. I think it would make sense to have at least one sentence =
to introduce it.
 
This is fixed by the newly introduced subheadings which =
clarify that some tables are for initialization and some for cache =
updates.
 


  • Page 11: =
The position of the table confuses me.
 
Fixed.
 
 
Best Regards,
Joe, Michael and Safiqul
 

_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

=

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	charset=utf-8

Make that -03=E2=80=A6 we just published 02.

> On Mar 13, 2020, at 8:24 AM, Joseph Touch  =
wrote:
>=20
> FYI - I have -02 already in prep and added the item below.
>=20
> Joe
>=20
>> On Mar 12, 2020, at 9:26 AM, Michael Welzl > wrote:
>>=20
>>=20
>>=20
>>> On Mar 12, 2020, at 4:23 PM, Scharf, Michael =
> =
wrote:
>>>=20
>>> Hi Michael,
>>> =20
>>> Thanks a lot for the update. Indeed, the organization of the content =
has improved a lot.
>>> =20
>>> A small editorial nit: s/TCP/TCB/ in =E2=80=9E6.2. Updates to the =
new TCP=E2=80=9C?
>>=20
>> Oops  :)   sure!
>>=20
>> =20
>>> With chair hat on: I will try to find at least one other reviewer =
for this document. And a heads-up to the community: A WGLC is planned =
within the next few months, subject to the constraint that there shall =
be not too many parallel WGLCs in TCPM.
>>> =20
>>> Thanks
>>=20
>> Thanks to you!
>>=20
>> Cheers,
>> Michael
>>=20
>>=20
>>> =20
>>> Michael
>>> =20
>>> =20
>>> =20
>>> Von: Michael Welzl 
>>> Gesendet: Samstag, 29. Februar 2020 23:59
>>> An: Scharf, Michael 
>>> Cc: draft-ietf-tcpm-2140bis@ietf.org =
; tcpm IETF list =

>>> Betreff: Re: [tcpm] draft-ietf-tcpm-2140bis-01
>>> =20
>>> Hi Michael,=20
>>> =20
>>> We have now addressed your comments (please see below).
>>>=20
>>>=20
>>> Begin forwarded message:
>>> =20
>>> From: "Scharf, Michael" >
>>> Subject: draft-ietf-tcpm-2140bis-01
>>> Date: 30 January 2020 at 01:28:50 CET
>>> To: "draft-ietf-tcpm-2140bis@ietf.org =
" =
>, tcpm IETF list =
>
>>> Resent-From: >
>>> Resent-To: >, =
>, >
>>> =20
>>> Hi,
>>> =20
>>> I have read the most recent version of 2140bis. As usually, my =
comments are posted with chair hat off.
>>> =20
>>> I encourage others to also read the document.
>>> =20
>>> Issues / comments:
>>> =20
>>> The document structure follows in many cases exactly RFC 2140, even =
if content has changed. In some cases, this confuses me. For instance, =
the Section =E2=80=9EAn Ensample of Temporal Sharing=E2=80=9C in RFC =
2140 indeed contained an implementation example. Section 6 of RFC =
2140bis is generic. This raises at least two questions f=C3=BCr Section =
6 and similarly for Section 7:
>>> 1.       Is the title for the section still appropriate?
>>> =20
>>> Good catch, thanks! It isn't. Fixed it to "Temporal Sharing" (and =
"Ensemble Sharing" in case of Section 7).
>>> =20
>>> =20
>>> 2.       Is some additional explanation needed e.g. on page 6 that =
an implementation can decide to implement only subsets of the table on =
page 6, as an early heads-up?
>>> =20
>>> We don't make a recommendations for implementers but just present =
the possibilities with their pro's and con's; hence the text points at =
sections 8 and 9 for compatibility issues and implications of sharing =
the information. Thus, we believe that's the most appropriate type of =
"early heads-up".
>>> =20
>>>=20
>>>=20
>>> Sections 6, 7, 8, 9 and 10 are longer than the original 2140. I =
wonder if subsections would be useful to better structure them. At least =
I find some of the long text blocks hard to read and it is not always =
apparent how a given paragraph fits into the overall storyline. I =
suspect that the document would be easier to parse with some more =
structuring (e.g., subsections).
>>> =20
>>> We inserted sub-headings in Sections 6, 7, 8 and 9. This was great =
advice indeed! This should be much clearer now, especially sections 6 =
and 7.
>>> =20
>>>=20
>>>=20
>>> The internal structure of Section 8 is hard to understand. For =
instance, ECMP and LAG are discussed twice. Also, this section discusses =
quite a number of different aspects, including fairness, challenges with =
ECMP/LAG, interactions with fast recovery and NAT. I suggest to either =
add early an explanation what is meant by =E2=80=9Ecompatibility=E2=80=9C,=
 or to use sub-sections to make clear what topics are in scope (see =
above).
>>> =20
>>> We have re-organized the text here a bit, removing a redundant =
statement about ECMP and LAG, and inserted sub-headings in Section 8.
>>> =20
>>>=20
>>>=20
>>> The separation of topics between Section 8 and 9 is not fully clear =
to me (different to RFC 2140 =E2=80=93 prior to deployment these =
sections had a relatively clear meaning). For instance, both sections =
discuss traffic with possibly short flows (e.g., http). I think the =
existing content could be reorganized by copy&paste in sections with a =
well-defined focus. Example section titles could be:
>>> Fairness issues
>>> Impact on applications and performance
>>> Interactions with network mechanism
>>> Discussion of design aspects and alternatives
>>> =E2=80=A6 (or other terms =E2=80=93 I just post this list to =
illustrate that alternatives could exist)
>>> =20
>>> =20
>>> 8 are issues local to the TCB sharing function; 9 are interactions =
with other architecture and protocol issues. Although the sum of the two =
sections could be completely revised, we don't currently see a benefit.
>>> =20
>>>=20
>>>=20
>>> The table on page 15 is a bit dated. I hope that we could update =
that, say, during a WGLC
>>> =20
>>> We believe that the best approach is to copy+paste this table into =
an email and send it to the mailing list for checking. We'll do this.
>>> =20
>>>=20
>>>=20
>>> Section 12: I am not sure if I fully understand the attack vectors =
section. For instance, how would an attack like =E2=80=9Ean application =
can open a connection and set its window size to zero, denying service =
to any other subsequent connection between those hosts.=E2=80=9C work if =
the receive window is not shared?
>>> =20
>>> We agree, this was wrong; we removed this line.
>>> =20
>>>=20
>>>=20
>>> In addition, I wonder if privacy needs to be discussed, e.g., =
whether user tracking or fingerprinting is possible by the methods =
discussed in the document.
>>> =20
>>> Added a paragraph to the security section addressing this. We =
believe the mixing mitigates the effect of reuse.
>>> =20
>>> =20
>>> Section 14: I would classify more references as =E2=80=9Enormative=E2=80=
=9C (e.g., RFC 793)
>>> =20
>>> Done (RFC 793, 1122, the PMTUD RFCs and the TFO RFC)
>>> =20
>>>=20
>>>=20
>>> Appendix C.3: I really wonder why not to specify the algorithm with =
(optional) persistence across reboots
>>> =20
>>> Because it's the same as temporal sharing, just with different =
averaging and information decay.
>>> =20
>>>=20
>>>=20
>>> =20
>>> Editorial nits:
>>> =20
>>> Please ensure that capitalization of all headlines is consistent =
(e.g., title of Apendix A)
>>> =20
>>> Done
>>> =20
>>>=20
>>>=20
>>> Same for all table captions (e.g., caption =E2=80=9EOption info=E2=80=9C=
)
>>> =20
>>> Done.
>>> =20
>>>=20
>>>=20
>>> Section 2: I am not sure about this wording: s/permitted by TCP =
implementers/permitted by TCP standards/ ???
>>> =20
>>> Done (replaced as you suggest).
>>> =20
>>>=20
>>>=20
>>> In the table on Section 5, =E2=80=9Eround-trip time and variance=E2=80=
=9C appears twice, is this a bug or a feature? (Same as in RFC 2140)
>>> =20
>>> It's a bug. Removed.
>>> =20
>>>=20
>>>=20
>>> Page 7 refers to Appendix B. If that appendix shall indeed be =
removed prior to publication, that reference also needs to be removed. =
Maybe that sentence should be flagged for removal, too?!
>>> =20
>>> Done.
>>> =20
>>>=20
>>>=20
>>> On page 7 and 8, I believe that the position of the tables could be =
rearranged so that they are not rendered back-to-back. Both tables seem =
partly unrelated and the current position may be a bit confusing. Same =
issue later on page 10. (Alternatively, the tables could be numbered to =
make clear that they are separate.)
>>> =20
>>> Fixed: the tables are now clearer due to the new subheadings.
>>> =20
>>>=20
>>>=20
>>> On page 8, the order of the entries in the table and the order of =
their explanation is not well aligned. This may be a matter of personal =
taste, but I would expect a somewhat similar order.
>>> =20
>>> Fixed.
>>> =20
>>>=20
>>>=20
>>> Page 8/9: =E2=80=9EThe method for merging old and current values =
needs to attempt to reduce the transient for new connections.=E2=80=9C I =
am not sure if I fully understand what is meant by this (albeit I =
suspect a certain meaning).
>>> =20
>>> Clarified.
>>> =20
>>> =20
>>> Page 9: The table in the upper part of the page is not explained. I =
think it would make sense to have at least one sentence to introduce it.
>>> =20
>>> This is fixed by the newly introduced subheadings which clarify that =
some tables are for initialization and some for cache updates.
>>> =20
>>>=20
>>>=20
>>> Page 11: The position of the table confuses me.
>>> =20
>>> Fixed.
>>> =20
>>> =20
>>> Best Regards,
>>> Joe, Michael and Safiqul
>>> =20
>>=20
>> _______________________________________________
>> tcpm mailing list
>> tcpm@ietf.org 
>> https://www.ietf.org/mailman/listinfo/tcpm
>=20


--Apple-Mail=_AB31F352-57C2-4D28-AF24-9D74C3003A30
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

Make =
that -03=E2=80=A6 we just published 02.

On Mar =
13, 2020, at 8:24 AM, Joseph Touch <touch@strayalpha.com> wrote:

FYI - I have -02 =
already in prep and added the item below.

Joe

On Mar =
12, 2020, at 9:26 AM, Michael Welzl <michawe@ifi.uio.no> =
wrote:



On Mar 12, 2020, at 4:23 PM, Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:

Hi =
Michael,
 
Thanks a =
lot for the update. Indeed, the organization of the content has improved =
a lot.
 
A small =
editorial nit: s/TCP/TCB/ in =E2=80=9E6.2. Updates to the new =
TCP=E2=80=9C?

Oops  :)   sure!

 
With =
chair hat on: I will try to find at least one other reviewer for this =
document. And a heads-up to the community: A WGLC is planned within the =
next few months, subject to the constraint that there shall be not too =
many parallel WGLCs in TCPM.
 
Thanks

Thanks to you!

Cheers,
Michael


 
Michael
 
 
 
Von: Michael Welzl
Gesendet: Samstag, 29. Februar =
2020 23:59
An: Scharf, Michael
Cc: draft-ietf-tcpm-2140bis@ietf.org; tcpm IETF list
Betreff: Re: [tcpm] =
draft-ietf-tcpm-2140bis-01
 
Hi Michael, 
 
We have now addressed your comments =
(please see below).


Begin forwarded message:
 
From: "Scharf, Michael" <Michael.Scharf@hs-esslingen.de>
Subject: draft-ietf-tcpm-2140bis-01
Date: 30 January 2020 at 01:28:50 =
CET
Resent-From: <alias-bounces@ietf.org>
 
Hi,
 
I have read the most recent version of =
2140bis. As usually, my comments are posted with chair hat off.
 
I encourage others to also read the =
document.
 
Issues / comments:
 
  • The document structure follows in many cases =
exactly RFC 2140, even if content has changed. In some cases, this =
confuses me. For instance, the Section =E2=80=9EAn Ensample of Temporal =
Sharing=E2=80=9C in RFC 2140 indeed contained an implementation example. =
Section 6 of RFC 2140bis is generic. This raises at least two questions =
f=C3=BCr Section 6 and similarly for Section 7:
1.       Is the title =
for the section still appropriate?
 
Good catch, thanks! It isn't. Fixed it to "Temporal Sharing" =
(and "Ensemble Sharing" in case of Section 7).
 
 
2.       Is some =
additional explanation needed e.g. on page 6 that an implementation can =
decide to implement only subsets of the table on page 6, as an early =
heads-up?
 
We don't make a recommendations for =
implementers but just present the possibilities with their pro's and =
con's; hence the text points at sections 8 and 9 for compatibility =
issues and implications of sharing the information. Thus, we believe =
that's the most appropriate type of "early heads-up".
 


  • Sections =
6, 7, 8, 9 and 10 are longer than the original 2140. I wonder if =
subsections would be useful to better structure them. At least I find =
some of the long text blocks hard to read and it is not always apparent =
how a given paragraph fits into the overall storyline. I suspect that =
the document would be easier to parse with some more structuring (e.g., =
subsections).
 
We inserted sub-headings in Sections 6, 7, 8 and 9. This was =
great advice indeed! This should be much clearer now, especially =
sections 6 and 7.
 


  • The =
internal structure of Section 8 is hard to understand. For instance, =
ECMP and LAG are discussed twice. Also, this section discusses quite a =
number of different aspects, including fairness, challenges with =
ECMP/LAG, interactions with fast recovery and NAT. I suggest to either =
add early an explanation what is meant by =E2=80=9Ecompatibility=E2=80=9C,=
 or to use sub-sections to make clear what topics are in scope (see =
above).
 
We have re-organized the text here a bit, removing a =
redundant statement about ECMP and LAG, and inserted sub-headings in =
Section 8.
 


  • The =
separation of topics between Section 8 and 9 is not fully clear to me =
(different to RFC 2140 =E2=80=93 prior to deployment these sections had =
a relatively clear meaning). For instance, both sections discuss traffic =
with possibly short flows (e.g., http). I think the existing content =
could be reorganized by copy&paste in sections with a well-defined =
focus. Example section titles could be:
  • Fairness =
issues
  • Impact on applications and performance
  • Interactions with network mechanism
  • Discussion of design aspects and alternatives
  • =E2=80=A6 (or other terms =E2=80=93 I just post this list =
to illustrate that alternatives could exist)
 
 
8 are issues local to the TCB sharing =
function; 9 are interactions with other architecture and protocol =
issues. Although the sum of the two sections could be completely =
revised, we don't currently see a benefit.
 


  • The table =
on page 15 is a bit dated. I hope that we could update that, say, during =
a WGLC
 
We believe that the best approach is to copy+paste this table =
into an email and send it to the mailing list for checking. We'll do =
this.
 


  • Section =
12: I am not sure if I fully understand the attack vectors section. For =
instance, how would an attack like =E2=80=9Ean application can open a =
connection and set its window size to zero, denying service to any other =
subsequent connection between those hosts.=E2=80=9C work if the receive =
window is not shared?
 
We agree, this was wrong; we removed this line.
 


  • In =
addition, I wonder if privacy needs to be discussed, e.g., whether user =
tracking or fingerprinting is possible by the methods discussed in the =
document.
 
Added a paragraph to the security =
section addressing this. We believe the mixing mitigates the effect of =
reuse.
 
 
  • Section 14: I would classify more references as =
=E2=80=9Enormative=E2=80=9C (e.g., RFC 793)
 
Done (RFC 793, 1122, the PMTUD RFCs and the TFO RFC)
 


  • Appendix =
C.3: I really wonder why not to specify the algorithm with (optional) =
persistence across reboots
 
Because it's the same as temporal sharing, just with =
different averaging and information decay.
 


 
Editorial nits:
 
  • Please ensure that capitalization of all headlines =
is consistent (e.g., title of Apendix A)
 
Done
 


  • Same for =
all table captions (e.g., caption =E2=80=9EOption info=E2=80=9C)
 
Done.
 


  • Section 2: =
I am not sure about this wording: s/permitted by TCP =
implementers/permitted by TCP standards/ ???
 
Done (replaced as you suggest).
 


  • In the =
table on Section 5, =E2=80=9Eround-trip time and variance=E2=80=9C =
appears twice, is this a bug or a feature? (Same as in RFC 2140)
 
It's a bug. Removed.
 


  • Page 7 =
refers to Appendix B. If that appendix shall indeed be removed prior to =
publication, that reference also needs to be removed. Maybe that =
sentence should be flagged for removal, too?!
 
Done.
 


  • On page 7 =
and 8, I believe that the position of the tables could be rearranged so =
that they are not rendered back-to-back. Both tables seem partly =
unrelated and the current position may be a bit confusing. Same issue =
later on page 10. (Alternatively, the tables could be numbered to make =
clear that they are separate.)
 
Fixed: the tables are now clearer due to the new =
subheadings.
 


  • On page 8, =
the order of the entries in the table and the order of their explanation =
is not well aligned. This may be a matter of personal taste, but I would =
expect a somewhat similar order.
 
Fixed.
 


  • Page 8/9: =E2=80=9EThe=
 method for merging old and current values needs to attempt to reduce =
the transient for new connections.=E2=80=9C I am not sure if I fully =
understand what is meant by this (albeit I suspect a certain =
meaning).
 
Clarified.
 
 
  • Page 9: The table in the upper part of the page is =
not explained. I think it would make sense to have at least one sentence =
to introduce it.
 
This is fixed by the newly introduced subheadings which =
clarify that some tables are for initialization and some for cache =
updates.
 


  • Page 11: =
The position of the table confuses me.
 
Fixed.
 
 
Best Regards,
Joe, Michael and Safiqul
 

_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm


=

--Apple-Mail=_AB31F352-57C2-4D28-AF24-9D74C3003A30--


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From: "Scharf, Michael" 
To: Bob Briscoe , tcpm IETF list 
CC: Richard Scheffenegger , Mirja Kuehlewind 
Thread-Topic: AW: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-ecn-11.txt
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Bob,

Regarding =84The WG chose the first counter bit, so I wrote it up.=93: We a=
ll know that working group documents can take several iterations before con=
verging to the =84best=93 solution that has (hopefully unanimous) WG consen=
sus. If the working group has change control over the content, discussing t=
echnical pros and cons of a document update is business as usual. Yet, I do=
n=92t think that many iterations will be required for this specific option =
encoding question, given that there are many straightforward and trivial so=
lutions that would all address my concern.

Other than that, I am only interested in discussing technical pros and cons=
 of alternatives to the proposal -11, in order to find a better engineering=
 approach. My concerns are not related to formal proofs of protocol correct=
ness.

Thanks

Michael (chair hat off, as usual)


Von: Bob Briscoe
Gesendet: Donnerstag, 12. M=E4rz 2020 19:59
An: Scharf, Michael; tcpm IETF list<=
mailto:tcpm@ietf.org>
Cc: Richard Scheffenegger; Mirja K=
uehlewind
Betreff: Re: AW: [tcpm] New Version Notification for draft-ietf-tcpm-accura=
te-ecn-11.txt

Michael,

On 10/03/2020 23:27, Scharf, Michael wrote:
Bob,

Out of my head, I am not aware of any IETF protocol that uses TLV encoding =
with ambiguous message formats, i.e., message with the same type but differ=
ent message formats depending on earlier messages. For instance, this can e=
asily get messy during debugging. And a protocol that is hard to debug is *=
not robust* in my point of view.

I understand that the highest bit solution is not ideal. I am merely pushin=
g back on the notion that it is completely unacceptable.


I have already pointed out that IMHO a tool like Wireshark cannot correctly=
 decode the option for a partial PCAP trace. The same applies to any passiv=
e monitoring tool that uses sampling. This has significant operational impa=
ct. Well, your mileage may vary, but I see no value in obscuring the counte=
rs by an =84unorthodox=93 encoding that requires keeping state to figure ou=
t what the option format actually is.

And I am not a hardware expert, but if AccECN should really be sucessful, h=
ardware offloading in NICs will probably matter in future. Thus, the length=
 of options is not the only tradeoff to be considered to make the protocol =
sucessful. As far as I understand, simple stateless message formats help a =
lot when it comes to hardware offloading.
That was indeed why we originally had a fixed field order.

I proposed two alternative ways to allow different field orders: a) two opt=
ion kinds or b) first counter bit.
The WG chose the first counter bit, so I wrote it up.

I just wish this WG would make up its mind, and have some discipline so tha=
t people know in advance that a decision will not be reversed at the next m=
eeting. Then people know that they have to stop reading their email and rea=
lly think carefully before making a decision.



It is well understood that many implementers may try to avoid the option al=
together. An =84unorthodox=93 encoding will almost certainly not help to ge=
t the option widely deployed.

Just to repeat myself, if I had to pick between the current proposal in -11=
 and two different option codepoints, I would go for the latter. We have >1=
50 TCP option codepoints left. That resource is not so scarce after all. I =
fail to see any real-world benefit of the proposal in -11 as compared to tw=
o separate codepoints.

In a nutshell, I believe you should look for an option design that can be p=
rocessed by a stateless decoder. In other words, KISS. There are plenty of =
ways how to do that, and adding a byte is only one of them. I have already =
mentioned several other alternatives, and probably there are more (e.g., on=
e could use a 2-bit type field for each counter to identify it). All of the=
m seem *simpler* to me than the current proposal in -11.

To me, this idea in -11 *is broken* and this should be fixed in -12.
I don't think you have answered my questions sufficiently to make such a cl=
aim. You have given examples of cases where 3rd party monitoring will get c=
onfused. But calling that "broken" is, I think, an overstatement. How does =
the protocol itself /break/?

You have said it doesn't allow the order to be changed mid connection. But =
that is not "broken". That is a feature that I'm not convinced is needed. I=
f the occasional connection would have made more efficient use of 3B of opt=
ion space if it had been able to switch to a different field order, is that=
 worth the extra complexity?

That is what I was getting at from my questions: What is actually "not robu=
st / broken" about it? In what case(s) can it fail? Have you proved these p=
roblems exist (whether paper proof or empirical)?

What I don't want to happen (again) is that the WG swings to yet another so=
lution, before a proper case has been made for the need to do so.


Bob


Michael


Von: Bob Briscoe
Gesendet: Dienstag, 10. M=E4rz 2020 23:00
An: Scharf, Michael; tcpm IETF list<=
mailto:tcpm@ietf.org>
Cc: Richard Scheffenegger; Mirja K=
uehlewind
Betreff: Re: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-e=
cn-11.txt

Michael,

I agree extensibility is nice. And I'm open to a design with a 1 octet fiel=
d immediately after the length field, for flags and the like. In fact, I en=
couraged Ilpo to put his idea to the list (which he had put to be offlist).=
 But let's be disciplined about this if we're going to start down this road=
...

1) This is not the time for "it would be nice if". I want to go back to you=
r original email and ask you to be much more specific about the problems en=
visaged. I agree the idea of switching field order based on the first bit i=
s unorthodox, but what is actually "not robust" about it? In what case(s) c=
an it fail? Have you proved these problems exist (whether paper proof or em=
pirical)?

2) We have a very *inextensible* lack of TCP option space to deal with. And=
 we don't know what other important options might be invented in future. So=
 we shouldn't burn even a single byte unless we have good reason to. Extens=
ibility is good. But it does burn space.

3) I haven't asked my co-authors, but I know that Mirja wanted the design t=
o be as simple as possible, and now we're moving away from that.

If it ain't broken don't fix it.



Bob

On 09/03/2020 20:00, Scharf, Michael wrote:
With chair hat off, I really wonder if the solution to encode the two diffe=
rent orders in the TCP Option is an example for good and robust protocol en=
gineering.

For instance, the current design makes it hard to decode the field in a mon=
itoring tool (such as Wireshark). Also, as far as I understand, it does not=
 allow to switch the encoding during a connection, which limits flexibility=
. We almost certainly do not understand *now* all future use cases of this =
Standard.

Unless I miss something, there would be several other solutions:

First, IMHO, we have enough TCP option codepoints left to spend two codepoi=
nts if there is a good reason for doing so. As compared to the current desi=
gn proposal in -10/-11, spending two different option kinds would look to m=
e like *much* better protocol engineering.

Second, if the TCPM community insists in only one option kind codepoint for=
 whatever reason, IMHO one could add one =84sub-type=93 byte to the option.=
 The TCP Option field has to be multiples of 4 byte, i.e., if a segment onl=
y contains a 11 byte AccECN TCP option, an additional NOP TCP option is nee=
ded for padding, no? So, what downside have 12 bytes as compared to 11 byte=
s? For the shorter variants, the overhead of a =84sub-type=93 field increas=
es, but it may still be within reasonable limits. What do I miss?

Third, one could use different lengths for the different orders, e.g., lent=
hs 5/8/11 for type 0 and 6/9/12 for type 12. Is this not possible?

In all these cases, the resulting protocol looks simpler and more robust to=
 me. What prevents us from using the KISS principle?

Michael



Von: Bob Briscoe
Gesendet: Freitag, 6. M=E4rz 2020 04:34
An: tcpm IETF list
Cc: Richard Scheffenegger; Mirja K=
uehlewind
Betreff: Re: [tcpm] New Version Notification for draft-ietf-tcpm-accurate-e=
cn-11.txt

tcpm,

You will have seen draft-10 then draft-11 in quick succession, as already e=
xplained.
The diffs from draft-09 to -10 were those that had built up since Jul'19.
The diffs from draft-10 to -11 were solely those for the change from EXP tr=
ack to STD track.
Draft-10 doesn't seem to display in the list of links to each version, but =
you can manually write the URL.

The main technical changes in draft-10 were numerous - many will be recogni=
zed from list discussion since Jul'19.
Particular thanks to Ilpo J=E4rvinen who identified many niggles (and their=
 solutions) while writing and testing a full Linux implementation (based on=
 Olivier Tilmans's, in turn based on Mirja's).

  *   Allowed 2 different orders of the fields in the AccECN Option
  *   Reflect IP-ECN field of SYN/ACK only on ACK of SYN/ACK, not also on f=
irst data packet
     *   greatly simplifies implementation, esp with TFO.
     *   repeating on first data packet was for reliable delivery, which is=
 now achieved with ACE counter (see next bullet)
  *   Increment the ACE counter if CE on SYN/ACK (but still not if CE on SY=
N)
     *   Reliable delivery of feedback of CE on SYN/ACK
  *   Redefine 'first packet' as first to arrive, not first in sequence in =
2 cases:
     *   Handshake reflection on the ACK of the SYN/ACK
     *   In the test for zeroing of ACE
     *   Reason: greatly simplifies implementation
  *   if ACE could have wrapped more than once, SHOULD assume =93safest lik=
ely case=94
not "conservatively assume" it did cycle
     *   Reason: avoid unnecessary hit on performance
  *   More robustness (with flexibility) in rules for when to include an Ac=
cECN Option
     *   Change-triggered AccECN Option as SHOULD, not MUST
     *   SHOULD follow change-triggered AccECN Option with another (removes=
 ambiguity if ACK thinning or loss)
     *   when same counter continues to increment, SHOULD consistently incl=
ude it every n ACKs
     *   Made rule about precedence of SACK conditional (max 2 SACK blocks)
     *   MAY exclude counters that have not changed for the whole connectio=
n
  *   Allowed an AccECN server not to implement RFC3168 ECN (all clients st=
ill have to)
  *   Precluded mixed capability negotiation from either end
     *   reduces freedom to choose SYN & SYN/ACK fall-back strategies
     *   to prevent cases where each end's outcome after handshake could be=
 inconsistent (in reordering corner-cases)
  *   Reserved the codepoint combination used by the historic nonce case
  *   Merged in a number of points from RFC3168 that we hadn't covered
     *   (a whole new subsection about obligations to do with ECN)
  *   Explicit about checking "acceptable packets"
     *   before counting their ECN markings or before counting the ECN feed=
back they carry
  *   Required retransmitted Fallback SYN to use same ISN
     *   allows servers to detect ECN downgrade SYN attacks
  *   Handled corner cases like In-window SYN during TIME-WAIT


Bob
On 06/03/2020 02:24, internet-drafts@ietf.org wrote:



A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt

has been successfully submitted by Bob Briscoe and posted to the

IETF repository.



Name:            draft-ietf-tcpm-accurate-ecn

Revision: 11

Title:           More Accurate ECN Feedback in TCP

Document date:   2020-03-05

Group:           tcpm

Pages:           58

URL:            https://www.ietf.org/internet-drafts/draft-ietf-tcpm-accura=
te-ecn-11.txt

Status:         https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-e=
cn/

Htmlized:       https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11

Htmlized:       https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accur=
ate-ecn

Diff:           https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-accurat=
e-ecn-11



Abstract:

   Explicit Congestion Notification (ECN) is a mechanism where network

   nodes can mark IP packets instead of dropping them to indicate

   incipient congestion to the end-points.  Receivers with an ECN-

   capable transport protocol feed back this information to the sender.

   ECN is specified for TCP in such a way that only one feedback signal

   can be transmitted per Round-Trip Time (RTT).  Recent new TCP

   mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP)

   or Low Latency Low Loss Scalable Throughput (L4S) need more accurate

   ECN feedback information whenever more than one marking is received

   in one RTT.  This document specifies a scheme to provide more than

   one feedback signal per RTT in the TCP header.  Given TCP header

   space is scarce, it allocates a reserved header bit, that was

   previously used for the ECN-Nonce which has now been declared

   historic.  It also overloads the two existing ECN flags in the TCP

   header.  The resulting extra space is exploited to feed back the IP-

   ECN field received during the 3-way handshake as well.  Supplementary

   feedback information can optionally be provided in a new TCP option,

   which is never used on the TCP SYN.









Please note that it may take a couple of minutes from the time of submissio=
n

until the htmlized version and diff are available at tools.ietf.org.



The IETF Secretariat







--

________________________________________________________________

Bob Briscoe                               http://bobbriscoe.net/



--
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/


--
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/

--_000_6EC6417807D9754DA64F3087E2E2E03E2D9DF244rznt8114rzntrzd_
Content-Type: text/html; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable










Bob,


 


Regarding =84The WG chose the first counter bit, so =
I wrote it up.=93: We all know that working group documents can take severa=
l iterations before converging to the =84best=93 solution that has (hopeful=
ly unanimous) WG consensus. If the working
 group has change control over the content, discussing technical pros and c=
ons of a document update is business as usual. Yet, I don=92t think that ma=
ny iterations will be required for this specific option encoding question, =
given that there are many straightforward
 and trivial solutions that would all address my concern.


 


Other than that, I am only interested in discussing =
technical pros and cons of alternatives to the proposal -11, in order to fi=
nd a better engineering approach. My concerns are not related to formal pro=
ofs of protocol correctness.



 


Thanks


 


Michael (chair hat off, as usual)


 


 




Von: Bob Briscoe

Gesendet: Donnerstag, 12. M=E4rz 2020 19:59

An: Scharf, Michae=
l; 
tcpm IETF list

Cc: Richard Sche=
ffenegger;
Mirja Kuehlewind

Betreff: Re: AW: [tcpm] New Version Notification for draft-ietf-tcpm=
-accurate-ecn-11.txt




 




Michael,




On 10/03/2020 23:27, Scharf, Michael wrote:<=
br>







Bob,


 


Out of my head, I am not aware of any IETF protocol =
that uses TLV encoding with ambiguous message formats, i.e., message with t=
he same type but different message formats depending on earlier messages. F=
or instance, this can easily get messy
 during debugging. And a protocol that is hard to debug is *not robust* in my point of view.







I understand that the highest bit solution is not ideal. I am merely pushin=
g back on the notion that it is completely unacceptable.








 


I have already pointed out that IMHO a tool like Wir=
eshark cannot correctly decode the option for a partial PCAP trace. The sam=
e applies to any passive monitoring tool that uses sampling. This has signi=
ficant operational impact. Well, your
 mileage may vary, but I see no value in obscuring the counters by an =84un=
orthodox=93 encoding that requires keeping state to figure out what the opt=
ion format actually is.


 


And I am not a hardware expert, but if AccECN should=
 really be sucessful, hardware offloading in NICs will probably matter in f=
uture. Thus, the length of options is not the only tradeoff to be considere=
d to make the protocol sucessful.
 As far as I understand, simple stateless message formats help a lot when i=
t comes to hardware offloading.





That was indeed why we originally had a fixed field order.



I proposed two alternative ways to allow different field orders: a) two opt=
ion kinds or b) first counter bit.

The WG chose the first counter bit, so I wrote it up.



I just wish this WG would make up its mind, and have some discipline so tha=
t people know in advance that a decision will not be reversed at the next m=
eeting. Then people know that they have to stop reading their email and rea=
lly think carefully before making
 a decision.










 


It is well understood that many implementers may try=
 to avoid the option altogether. An =84unorthodox=93 encoding will almost c=
ertainly not help to get the option widely deployed.


 


Just to repeat myself, if I had to pick between the =
current proposal in -11 and two different option codepoints, I would go for=
 the latter. We have >150 TCP option codepoints left. That resource is n=
ot so scarce after all. I fail to see
 any real-world benefit of the proposal in -11 as compared to two separate =
codepoints.


 


In a nutshell, I believe you should look for an opti=
on design that can be processed by a stateless decoder. In other words, KIS=
S. There are plenty of ways how to do that, and adding a byte is only one o=
f them. I have already mentioned several
 other alternatives, and probably there are more (e.g., one could use a 2-b=
it type field for each counter to identify it). All of them seem *simple=
r* to me than the current proposal in -11.


 


To me, this idea in -11 *is broken* and this =
should be fixed in -12.





I don't think you have answered my questions sufficiently to make such a cl=
aim. You have given examples of cases where 3rd party monitoring will get c=
onfused. But calling that "broken" is, I think, an overstatement.=
 How does the protocol itself /break/?



You have said it doesn't allow the order to be changed mid connection. But =
that is not "broken". That is a feature that I'm not convinced is=
 needed. If the occasional connection would have made more efficient use of=
 3B of option space if it had been able to
 switch to a different field order, is that worth the extra complexity?



That is what I was getting at from my questions: What is actually "not=
 robust / broken" about it? In what case(s) can it fail? Have you prov=
ed these problems exist (whether paper proof or empirical)?



What I don't want to happen (again) is that the WG swings to yet another so=
lution, before a proper case has been made for the need to do so.






Bob








 


Michael


 


 




Von: Bob Briscoe

Gesendet: Dienstag, 10. M=E4rz 2020 23:00

An: Scharf, Michae=
l; 
tcpm IETF list

Cc: Richard Sche=
ffenegger;
Mirja Kuehlewind

Betreff: Re: [tcpm] New Version Notification for draft-ietf-tcpm-acc=
urate-ecn-11.txt




 




Michael,



I agree extensibility is nice. And I'm open to a design with a 1 octet fiel=
d immediately after the length field, for flags and the like. In fact, I en=
couraged Ilpo to put his idea to the list (which he had put to be offlist).=
 But let's be disciplined about
 this if we're going to start down this road...



1) This is not the time for "it would be nice if". I want to go b=
ack to your original email and ask you to be much more specific about the p=
roblems envisaged. I agree the idea of switching field order based on the f=
irst bit is unorthodox, but what is actually
 "not robust" about it? In what case(s) can it fail? Have you pro=
ved these problems exist (whether paper proof or empirical)?



2) We have a very *inextensible* lack of TCP option space to deal with. And=
 we don't know what other important options might be invented in future. So=
 we shouldn't burn even a single byte unless we have good reason to. Extens=
ibility is good. But it does burn
 space.



3) I haven't asked my co-authors, but I know that Mirja wanted the design t=
o be as simple as possible, and now we're moving away from that.




If it ain't broken don't fix it.







Bob




On 09/03/2020 20:00, Scharf, Michael wrote:<=
br>







With chair hat off, I really wonder if the solution =
to encode the two different orders in the TCP Option is an example for good=
 and robust protocol engineering.



 


For instance, the current design makes it hard to de=
code the field in a monitoring tool (such as Wireshark). Also, as far as I =
understand, it does not allow to switch the encoding during a connection, w=
hich limits flexibility. We almost
 certainly do not understand *now* all future use cases of this Stan=
dard.


 


Unless I miss something, there would be several othe=
r solutions:


 


First, IMHO, we have enough TCP option codepoints le=
ft to spend two codepoints if there is a good reason for doing so. As compa=
red to the current design proposal in -10/-11, spending two different optio=
n kinds would look to me like *much*
 better protocol engineering.


 


Second, if the TCPM community insists in only one op=
tion kind codepoint for whatever reason, IMHO one could add one =84sub-type=
=93 byte to the option. The TCP Option field has to be multiples of 4 byte,=
 i.e., if a segment only contains a 11
 byte AccECN TCP option, an additional NOP TCP option is needed for padding=
, no? So, what downside have 12 bytes as compared to 11 bytes? For the shor=
ter variants, the overhead of a =84sub-type=93 field increases, but it may =
still be within reasonable limits. What
 do I miss?


 


Third, one could use different lengths for the diffe=
rent orders, e.g., lenths 5/8/11 for type 0 and 6/9/12 for type 12. Is this=
 not possible?


 


In all these cases, the resulting protocol looks sim=
pler and more robust to me. What prevents us from using the KISS principle?=



 


Michael


 


 


 




Von: Bob Briscoe

Gesendet: Freitag, 6. M=E4rz 2020 04:34

An: tcpm IETF list

Cc: Richard Sche=
ffenegger;
Mirja Kuehlewind

Betreff: Re: [tcpm] New Version Notification for draft-ietf-tcpm-acc=
urate-ecn-11.txt




 


tcpm,



You will have seen draft-10 then draft-11 in quick succession, as already e=
xplained.

The diffs from draft-09 to -10 were those that had built up since Jul'19.
The diffs from draft-10 to -11 were solely those for the change from EXP tr=
ack to STD track.

Draft-10 doesn't seem to display in the list of links to each version, but =
you can manually write the URL.



The main technical changes in draft-10 were numerous - many will be recogni=
zed from list discussion since Jul'19.

Particular thanks to Ilpo J=E4rvinen who identified many niggles (and their=
 solutions) while writing and testing a full Linux implementation (based on=
 Olivier Tilmans's, in turn based on Mirja's).


    

  • Allowed 2 different orders of the fields=
 in the AccECN Option

  • Reflect IP-ECN field of SYN/ACK onl=
y on ACK of SYN/ACK, not also on first data packet

      

    • greatly simplifies implementation, esp w=
ith TFO. 
    • repeating on first data pa=
cket was for reliable delivery, which is now achieved with ACE counter (see=
 next bullet)

    

  • Increment the ACE counter if CE on =
SYN/ACK (but still not if CE on SYN)

      

    • Reliable delivery of feedback of CE on S=
YN/ACK 
    

  • Redefine 'first packet' as first to=
 arrive, not first in sequence in 2 cases:

      

    • Handshake reflection on the ACK of the S=
YN/ACK 
    • In the test for zeroing of A=
CE 
    • Reason: greatly simplifies imple=
mentation 
    

  • if ACE could have wrapped more than=
 once, SHOULD assume =93safest likely case=94
    
not "conservatively assume" it did cycle

      

    • Reason: avoid unnecessary hit on perform=
ance 
    

  • More robustness (with flexibility) =
in rules for when to include an AccECN Option

      

    • Change-triggered AccECN Option as SHOULD=
, not MUST

    • SHOULD follow change-triggered AccE=
CN Option with another (removes ambiguity if ACK thinning or loss)

    • when same counter continues to incr=
ement, SHOULD consistently include it every n ACKs

    • Made rule about precedence of SACK =
conditional (max 2 SACK blocks)

    • MAY exclude counters that have not =
changed for the whole connection

    

  • Allowed an AccECN server not to imp=
lement RFC3168 ECN (all clients still have to)

  • Precluded mixed capability negotiat=
ion from either end

      

    • reduces freedom to choose SYN & SYN/=
ACK fall-back strategies

    • to prevent cases where each end's o=
utcome after handshake could be inconsistent (in reordering corner-cases)

    

  • Reserved the codepoint combination =
used by the historic nonce case

  • Merged in a number of points from R=
FC3168 that we hadn't covered

      

    • (a whole new subsection about obligation=
s to do with ECN)

    

  • Explicit about checking "accep=
table packets"

      

    • before counting their ECN markings or be=
fore counting the ECN feedback they carry

    

  • Required retransmitted Fallback SYN=
 to use same ISN

      

    • allows servers to detect ECN downgrade S=
YN attacks

    

  • Handled corner cases like In-window=
 SYN during TIME-WAIT







Bob




On 06/03/2020 02:24, 
internet-drafts@ietf.org wrote:






 


A new version of I-D, draft-ietf-tcpm-accurate-ecn-11.txt


has been successfully submitted by Bob Briscoe and posted to the


IETF repository.


 


Name:           =
; draft-ietf-tcpm-accurate-ecn


Revision: 11


Title:           Mor=
e Accurate ECN Feedback in TCP


Document date:   2020-03-05


Group:           tcp=
m


Pages:           58<=
/pre>

URL:           =
 https://www.ietf.org/internet-drafts/draft-iet=
f-tcpm-accurate-ecn-11.txt


Status:         https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/

Htmlized:       https://t=
ools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-11


Htmlized:       ht=
tps://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn


Diff:           https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-accu=
rate-ecn-11


 


Abstract:


   Explicit Congestion Notification (ECN) is a mechanism whe=
re network


   nodes can mark IP packets instead of dropping them to ind=
icate


   incipient congestion to the end-points.  Receivers w=
ith an ECN-


   capable transport protocol feed back this information to =
the sender.


   ECN is specified for TCP in such a way that only one feed=
back signal


   can be transmitted per Round-Trip Time (RTT).  Recen=
t new TCP


   mechanisms like Congestion Exposure (ConEx), Data Center =
TCP (DCTCP)


   or Low Latency Low Loss Scalable Throughput (L4S) need mo=
re accurate


   ECN feedback information whenever more than one marking i=
s received


   in one RTT.  This document specifies a scheme to pro=
vide more than


   one feedback signal per RTT in the TCP header.  Give=
n TCP header


   space is scarce, it allocates a reserved header bit, that=
 was


   previously used for the ECN-Nonce which has now been decl=
ared


   historic.  It also overloads the two existing ECN fl=
ags in the TCP


   header.  The resulting extra space is exploited to f=
eed back the IP-


   ECN field received during the 3-way handshake as well.&nb=
sp; Supplementary


   feedback information can optionally be provided in a new =
TCP option,


   which is never used on the TCP SYN.


 


            &nb=
sp;            =
            &nb=
sp;            =
            &nb=
sp;            =
       


 


 


Please note that it may take a couple of minutes from the time of subm=
ission


until the htmlized version and diff are available at tools.ietf.org.

 


The IETF Secretariat


 


 











-- 


________________________________________________________________


Bob Briscoe          =
;            &n=
bsp;        http://bobbriscoe.net/


 








--=20
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/








--=20
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/






--_000_6EC6417807D9754DA64F3087E2E2E03E2D9DF244rznt8114rzntrzd_--



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From: "Carles Gomez Montenegro" 
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Dear all,

First of all, we would like to thank everyone who gave feedback and very
interesting ideas regarding the 'TCP ACK Pull' proposal.

We agree with Bob Briscoe (and others) that, before designing solutions,
we should first work on clarifying the scope of the problem, and determine
which may be the requirements for potential solutions.

Along the above lines, we submitted a new I-D (please find pointers to it
below). The main purpose of the document is to present the problem
statement, and derive requirements for potential solutions.

Additionally, some potential solutions that have been suggested in this
space are also discussed in the I-D. This part of the document might be
removed at some point, and of course we need to first focus on
requirements. However, it seemed to us that this part of the document
might provide additional value by illustrating the trade-offs in the
solution space, as per our current understanding of the problem.

Feedback is more than welcome!

Also, if anyone would like to contribute and join the effort, please do
not hesitate to let us know.

Cheers,

Carles



---------------------------- Original Message ----------------------------
Subject: New Version Notification for
draft-gomez-tcpm-delack-suppr-reqs-00.txt
From:    internet-drafts@ietf.org
Date:    Sat, March 7, 2020 2:02 pm
To:      "Jon Crowcroft" 
         "Carles Gomez" 
--------------------------------------------------------------------------


A new version of I-D, draft-gomez-tcpm-delack-suppr-reqs-00.txt
has been successfully submitted by Carles Gomez and posted to the
IETF repository.

Name:		draft-gomez-tcpm-delack-suppr-reqs
Revision:	00
Title:		Delayed Acknowledgments Suppression: Problem Statement,
Requirements and Analysis of Potential Solutions
Document date:	2020-03-07
Group:		Individual Submission
Pages:		11
URL:           
https://www.ietf.org/internet-drafts/draft-gomez-tcpm-delack-suppr-reqs-00.txt
Status:        
https://datatracker.ietf.org/doc/draft-gomez-tcpm-delack-suppr-reqs/
Htmlized:      
https://tools.ietf.org/html/draft-gomez-tcpm-delack-suppr-reqs-00
Htmlized:      
https://datatracker.ietf.org/doc/html/draft-gomez-tcpm-delack-suppr-reqs


Abstract:
   Delayed Acknowledgments (ACKs) allow reducing protocol overhead in
   many scenarios.  However, in some cases, Delayed ACKs may
   significantly degrade network and device performance in terms of link
   utilization, latency, memory usage and/or energy consumption.  This
   document presents the problem statement regarding Delayed ACKs
   suppression.  The document discusses the scenarios and use cases in
   which Delayed ACKs suppression offers advantages.  Then, requirements
   for a potential solution are derived.  Finally, a number of potential
   solutions are discussed, based on the requirements, and also
   considering pros and cons in each case.




Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat





From nobody Sun Mar 15 02:38:54 2020
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From: "Carles Gomez Montenegro" 
To: "Jonathan Morton" 
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Subject: Re: [tcpm] More motivating scenarios for tcpm-ack-pull
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Hi Jonathan,

(Sorry for the late response.)

Thanks a lot for your detailed response, which helped shape our latest
draft [1] in several ways.

While we focus on analyzing the problem space and its requirements, it
will be good to keep an eye on potential solutions as well, including the
one you describe below. In particular, I found the idea of spacing AKP
flags (or something similar) in order to control the desired ACK ratio to
be very interesting!

Thanks again!

Cheers,

Carles

[1] https://tools.ietf.org/html/draft-gomez-tcpm-delack-suppr-reqs-00.
Comments are very much welcome!


> I note that the semantics of the AKP flag differ subtly from that of PSH,
> in that the former says "I want an ack immediately", while the latter says
> "I have temporarily run out of data to send, so the receiving
> application's buffer should be flushed now".  It would be just as easy to
> modify existing receivers to treat PSH as an immediate ack request as to
> implement handling of AKP, so this simple use doesn't seem very compelling
> for allocating a scarce bit.
>
> One potentially interesting application that was suggested to me, and
> which could legitimately motivate the use of a new reserved flag bit, was
> to provide a hint as to the correct Delayed Ack ratio, for use as a
> congestion control mechanism for acks.  Presently an ack stream can be
> anti-responsive, in that dropping acks from a heavily congested reverse
> path can actually increase the ack arrival rate, by improving the
> throughput of an uncongested forward path that was limited by
> ack-clocking.  AckCC exists as an RFC to address this problem - and would
> tend to benefit from Generalised ECN - but its reliance on a TCP option is
> less than optimal, given the traversal problems often cited.
>
> A way that such a hint could work is by spacing AKP flags at the desired
> ack ratio.  A receiver observing AKP flags could then infer that the usual
> Delayed Ack rule requiring an ack for every two MSS received is suspended,
> and thus only send acks when AKP is set, the Delayed Ack timer expires, or
> some other forcing condition occurs.
>
> It might be wise to restore normal Delayed Ack rules if the AKP flags stop
> indicating a reasonable ratio, for example if the Delayed Ack timer
> expires twice without an AKP flag arriving.  A maximum ratio could be
> specified as a sanity check, eg. 1:64, at which the receiver generates an
> ack even if an AKP hasn't arrived yet.
>
> The above hinting semantics would remain compatible with other use cases
> mentioned, as AKP still forces an ack.  However this is also a theoretical
> disadvantage because the segments marked with AKP generally won't coincide
> with the trailing end of bursts caused, for example, by link-layer
> aggregation or IRQ "optimisation" in NICs.  Those trailing segments are
> where you would optimally want to trigger an ack, but as currently
> specified, AKP removes the receiver's discretion to synchronise a sparse
> Delayed Ack ratio with those segments.
>
> This could be addressed by pairing AKP with PSH.  Both flags set together
> would require an immediate ack of that particular segment, with the
> implication both that an ack is expected promptly and that no more data is
> immediately forthcoming.  PSH by itself would continue to permit a degree
> of latitude with respect to ack timing, and merely indicates that prompt
> delivery to the application is required.  AKP by itself then requests a
> prompt ack, but one that may reflect following segments that are already
> in receive buffers and will be processed immediately after this one, as
> well as the hinting described above.
>
> I think that's a reasonable amount of new functionality to introduce for
> the cost of one bit.  The above suggestion addresses both the original
> problem and another long-standing one, with minimal newly allocated
> resources and relatively little risk of traversal problems.  And
> (importantly) TCP doesn't break if receivers ignore or fail to understand
> it.
>
>  - Jonathan Morton


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Date: Sun, 15 Mar 2020 10:47:21 +0100
From: "Carles Gomez Montenegro" 
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Subject: Re: [tcpm] More motivating scenarios for tcpm-ack-pull
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Hi Bob,

Thanks, once again, for your kind suggestions!

We agreed with your proposal below, and we published the initial version
of a new I-D [1] that has the aim that you described below (i.e.
requirements analysis plus discussion of suggested solutions).

We hope the document can be useful to analyze the problem space in a more
comprehensive approach.

Should you have further comments, please do not hesitate to let us know!

Cheers,

Carles

[1] https://tools.ietf.org/html/draft-gomez-tcpm-delack-suppr-reqs-00


> Carles,
>
> It strikes me that there is a lot of interest in doing something like
> ACK-pull, but also a lot of disagreement in where to draw the line
> between what to do and what not to do.
>
> Can I suggest that a way to resolve this would be to start with an
> informational requirements draft, that I am sure would be adopted as WG
> business immediately given the interest. Whereas any particular choice
> of mechanism at this stage would probably not get the necessary
> consensus to be adopted.
>
> The requirements draft could discuss solutions, not as a "on this we all
> agree" protocol, but in terms of their pros and cons, e.g. which
> mechanisms could satisfy which requirements, so they can be judged
> relative to each mechanism's complexity / traversibility / usage of bits
> / etc.
>
> I will warn you that a requirements draft could itself add years to the
> process (the accurate ECN requirements did [RFC7560]). But not if we
> agree to allow a solution draft to start in parallel once the
> requirements are starting to converge, rather than waiting for the
> requirements to go thru the full RFC process.
>
>
> You might prefer to continue evangelising ack-pull as a sufficient
> solution, so I don't want to say a requirements draft is the only way
> forward. But you saw my comment earlier - that once you've been through
> all the years of effort of getting anything changed in TCP, you
> sometimes feel that you wish you'd been more ambitious than just one bit
> at the start.
>
>
> Bob



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We, the authors had planned to present the attached set of slides at the =
107 meeting. The deck consist of both the slides we had planned for 106, =
but did not have an opportunity to present, and 107 which has been =
cancelled.=20

The work on the draft however has continued in that time frame. In the =
106 time frame we came up with a proposal on what we wanted to do with =
the draft, and since then went ahead and implemented some of those =
proposals. The submission of -04 reflects that work. It should also be =
noted that other drafts have been wanting to use this model. In =
particular, draft-ietf-idr-bgp-yang =
 uses the YANG =
model defined in this draft to secure the BGP session.

We believe the draft is ready for WG adoption at this time. Let us know =
if there are any questions.

Thanks.




> On Mar 9, 2020, at 1:37 PM, Mahesh Jethanandani =
 wrote:
>=20
> This update of the draft added text to address the issues we discussed =
in IETF 106. In particular it adds:
> a container to keep track of all TCP connections
> statistics and ability to clear them (if support for it is indicated =
using the feature statement)
> support for securing the connection using TCP-AO or MD5
> congestion control algorithms
> ECN
>=20
> Please review and provide comments.
>=20
> We, the authors believe that the draft is ready for WG adoption at =
this time.
>=20
> Thanks.
>=20
>> Begin forwarded message:
>>=20
>> From: internet-drafts@ietf.org 
>> Subject: New Version Notification for =
draft-scharf-tcpm-yang-tcp-04.txt
>> Date: February 24, 2020 at 11:56:39 AM PST
>> To: "Michael Scharf" >, "Mahesh Jethanandani" =
>, "Vishal =
Murgai" >
>>=20
>>=20
>> A new version of I-D, draft-scharf-tcpm-yang-tcp-04.txt
>> has been successfully submitted by Mahesh Jethanandani and posted to =
the
>> IETF repository.
>>=20
>> Name:		draft-scharf-tcpm-yang-tcp
>> Revision:	04
>> Title:		YANG Model for Transmission Control Protocol =
(TCP) Configuration
>> Document date:	2020-02-24
>> Group:		Individual Submission
>> Pages:		21
>> URL:            =
https://www.ietf.org/internet-drafts/draft-scharf-tcpm-yang-tcp-04.txt =

>> Status:         =
https://datatracker.ietf.org/doc/draft-scharf-tcpm-yang-tcp/ =

>> Htmlized:       =
https://tools.ietf.org/html/draft-scharf-tcpm-yang-tcp-04 =

>> Htmlized:       =
https://datatracker.ietf.org/doc/html/draft-scharf-tcpm-yang-tcp =

>> Diff:           =
https://www.ietf.org/rfcdiff?url2=3Ddraft-scharf-tcpm-yang-tcp-04 =

>>=20
>> Abstract:
>>   This document specifies a YANG model for TCP on devices that are
>>   configured by network management protocols.  The YANG model defines =
a
>>   container for all TCP connections and groupings of fundamental
>>   parameters that can be imported and used in many TCP =
implementations.
>>   The model includes definitions from YANG Groupings for TCP Client =
and
>>   TCP Servers (I-D.ietf-netconf-tcp-client-server).  The model is =
NMDA
>>   (RFC 8342) compliant.
>>=20
>>=20
>>=20
>>=20
>> Please note that it may take a couple of minutes from the time of =
submission
>> until the htmlized version and diff are available at tools.ietf.org =
.
>>=20
>> The IETF Secretariat
>>=20
>>=20



Mahesh Jethanandani (on behalf of all the authors).
mjethanandani@gmail.com




--Apple-Mail=_863A8EFD-ADB5-4A24-ABBA-7C12920925A3
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 boundary="Apple-Mail=_4F977837-5B72-4EB4-AA43-534C5CAD05D1"


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We, =
the authors had planned to present the attached set of slides at the 107 =
meeting. The deck consist of both the slides we had planned for 106, but =
did not have an opportunity to present, and 107 which has been =
cancelled. 

The =
work on the draft however has continued in that time frame. In the 106 =
time frame we came up with a proposal on what we wanted to do with the =
draft, and since then went ahead and implemented some of those =
proposals. The submission of -04 reflects that work. It should also be =
noted that other drafts have been wanting to use this model. In =
particular, draft-ietf-idr-bgp-yang uses the YANG model defined =
in this draft to secure the BGP session.

We believe the draft is ready for WG =
adoption at this time. Let us know if there are any questions.

Thanks.


=

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On Mar 9, 2020, at 1:37 PM, =
Mahesh Jethanandani <mjethanandani@gmail.com> wrote:

This update of the =
draft added text to address the issues we discussed in IETF 106. In =
particular it adds:
  • a container to keep track of all TCP connections
  • statistics and ability to clear them (if support for it is =
indicated using the feature statement)
  • support for =
securing the connection using TCP-AO or MD5
  • congestion =
control algorithms
  • ECN

Please review and provide =
comments.

We, =
the authors believe that the draft is ready for WG adoption at this =
time.

Thanks.

Begin forwarded =
message:

From: internet-drafts@ietf.org
Subject: New Version Notification for =
draft-scharf-tcpm-yang-tcp-04.txt
Date: February 24, 2020 at 11:56:39 AM PST
To: "Michael Scharf" <michael.scharf@hs-esslingen.de>, "Mahesh Jethanandani" =
<mjethanandani@gmail.com>, "Vishal Murgai" <vmurgai@cisco.com>

A new version of I-D, draft-scharf-tcpm-yang-tcp-04.txt
has been successfully submitted by Mahesh Jethanandani and =
posted to the
IETF repository.

Name:	=
	=
draft-scharf-tcpm-yang-tcp
Revision:	04
Title:=
		=
YANG Model for Transmission Control Protocol (TCP) =
Configuration
Document date:	2020-02-24
Group:=
		=
Individual Submission
Pages:		21
URL: =
           https://www.ietf.org/internet-drafts/draft-scharf-tcpm-yang-tcp=
-04.txt
Status: =
        https://datatracker.ietf.org/doc/draft-scharf-tcpm-yang-tcp/
Htmlized:       https://tools.ietf.org/html/draft-scharf-tcpm-yang-tcp-04Htmlized:       https://datatracker.ietf.org/doc/html/draft-scharf-tcpm-yang-tc=
p
Diff: =
          https://www.ietf.org/rfcdiff?url2=3Ddraft-scharf-tcpm-yang-tcp-=
04

Abstract:
 =
  This document specifies a YANG model for TCP on devices that =
are
   configured by network management =
protocols.  The YANG model defines a
 =
  container for all TCP connections and groupings of =
fundamental
   parameters that can be imported =
and used in many TCP implementations.
   The =
model includes definitions from YANG Groupings for TCP Client and
   TCP Servers =
(I-D.ietf-netconf-tcp-client-server).  The model is NMDA
   (RFC 8342) compliant.




Please note that =
it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


<=
/div>




Mahesh Jethanandani (on behalf of all the =
authors).






=

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Subject: Re: [tcpm] More motivating scenarios for tcpm-ack-pull
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Carles & Jon,

Yes, if the tcpm WG was prepared to consider adopting this, I'd support it.

A few comments:

I'm not sure I would limit it to "suppression" of delayed ACKs, and I 
don't just mean it should include releasing suppression. In many 
circumstances the sender would be happy with less frequent ACKs than the 
receiver is generating. E.g. with high performance data transfers, 1/16 
would often be fine when there are hundreds of packets in flight. But, 
because the receiver can't be sure whether the sender would suffer one 
of the downsides to delaying ACKs, it maintains a conservatively low 
delayed ACK ratio.

So perhaps a better scope (and title) would be "Sender control of 
Delayed ACKs in TCP"?

I've added 'in TCP', because I think it's useful to make the scope 
concrete. But I think this doc could also be useful for other transport 
protocols, particularly QUIC.

S3.1 & S3.2 Slow start & High bit rate environments and short data segments

    However, use of Delayed ACKs reduces the amount
    of ACKs received by the sender, thus reducing the rate of cwnd
    growth, increasing transfer time and reducing throughput, when
    compared with sending an ACK for each incoming data segment.

I think ABC (appropriate byte counting) allows the sender to 
unilaterally address that concern without needing ACK Pull [RFC3465].

The reference to 'more rapidly get up to speed during slow-start without 
overshoot' is a bit opaque. Rather than "describing by reference", it 
needs to describe the lack of ability to send patterns of packets (e.g. 
chirps) and be able to time the gaps between the ACKs. At minimum, the 
citation should refer to Appendix B.4, which was the mechanism proposed 
to do ACK pull at the time.

S.3.4 Beyond classic ACK transmission behavior

It ought to mention that many link technologies (Satellite, DOCSIS, LTE, 
WiFi, ...?) do TCP ACK thinning 'cos TCP doesn't do it itself, but it 
improves performance (when the ACK stream becomes the bottleneck for the 
forward path, because many reverse paths have pathetic bandwidth, esp. 
if a parallel upload is going on).

See "ACK Scaling and Performance on AsymmetricPaths"
https://erg.abdn.ac.uk/~downloads/ackscaling.pdf

4.2. Per-segment granularity

Between per-segment and permanent, there's per-connection suppression. 
I'm not saying that would be any use, I'm just saying it doesn't have to 
be permanent.

4.4 Support for enabling generic ACK ratios

This reminds me of a subtle additional requirement. When you move from 
ACK pull to controlling the ACK ratio, there's an important distinction 
between a sender's packet stopping the receiver delaying the ACK for 
/that/ packet (as in ACK pull), vs. setting the receiver's Delayed ACK 
policy for /that and subsequent/ packets.

This raises the question, should the mechanism use soft state (repeated 
in every packet), or connection state (remembered by the receiver)? 
Which is hinted at in your section on "safe return to normal operation".x

4.10+ Extra requirement: Who's in control?

The receiver cannot be expected to control ACKs in any way the sender 
wants, which it will not always be able to honour anyway. So the 
semantics have to be of a hint, not a request or a command. Then there's 
the question of whether the receiver just does what it wants, or whether 
it ought to tell the sender it's not doing what it was asked.

It might seem that the the receiver silently not doing what it's told is 
the simple case. However,  it adds complexity to anything trying to rely 
on the behaviour (e.g. the slow start examples).


A good first draft.
Thank you.



Bob

On 15/03/2020 09:47, Carles Gomez Montenegro wrote:
> Hi Bob,
>
> Thanks, once again, for your kind suggestions!
>
> We agreed with your proposal below, and we published the initial version
> of a new I-D [1] that has the aim that you described below (i.e.
> requirements analysis plus discussion of suggested solutions).
>
> We hope the document can be useful to analyze the problem space in a more
> comprehensive approach.
>
> Should you have further comments, please do not hesitate to let us know!
>
> Cheers,
>
> Carles
>
> [1] https://tools.ietf.org/html/draft-gomez-tcpm-delack-suppr-reqs-00
>
>
>> Carles,
>>
>> It strikes me that there is a lot of interest in doing something like
>> ACK-pull, but also a lot of disagreement in where to draw the line
>> between what to do and what not to do.
>>
>> Can I suggest that a way to resolve this would be to start with an
>> informational requirements draft, that I am sure would be adopted as WG
>> business immediately given the interest. Whereas any particular choice
>> of mechanism at this stage would probably not get the necessary
>> consensus to be adopted.
>>
>> The requirements draft could discuss solutions, not as a "on this we all
>> agree" protocol, but in terms of their pros and cons, e.g. which
>> mechanisms could satisfy which requirements, so they can be judged
>> relative to each mechanism's complexity / traversibility / usage of bits
>> / etc.
>>
>> I will warn you that a requirements draft could itself add years to the
>> process (the accurate ECN requirements did [RFC7560]). But not if we
>> agree to allow a solution draft to start in parallel once the
>> requirements are starting to converge, rather than waiting for the
>> requirements to go thru the full RFC process.
>>
>>
>> You might prefer to continue evangelising ack-pull as a sufficient
>> solution, so I don't want to say a requirements draft is the only way
>> forward. But you saw my comment earlier - that once you've been through
>> all the years of effort of getting anything changed in TCP, you
>> sometimes feel that you wish you'd been more ambitious than just one bit
>> at the start.
>>
>>
>> Bob
>
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpm

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/


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    Carles & Jon,

    

    Yes, if the tcpm WG was prepared to consider adopting this, I'd
    support it.

    

    A few comments:

    

    I'm not sure I would limit it to "suppression" of delayed ACKs, and
    I don't just mean it should include releasing suppression. In many
    circumstances the sender would be happy with less frequent ACKs than
    the receiver is generating. E.g. with high performance data
    transfers, 1/16 would often be fine when there are hundreds of
    packets in flight. But, because the receiver can't be sure whether
    the sender would suffer one of the downsides to delaying ACKs, it
    maintains a conservatively low delayed ACK ratio.

    

    So perhaps a better scope (and title) would be "Sender control of
    Delayed ACKs in TCP"?

    

    I've added 'in TCP', because I think it's useful to make the scope
    concrete. But I think this doc could also be useful for other
    transport protocols, particularly QUIC.

    

    S3.1 & S3.2 Slow start & High bit rate environments and
    short data segments

    
   However, use of Delayed ACKs reduces the amount
   of ACKs received by the sender, thus reducing the rate of cwnd
   growth, increasing transfer time and reducing throughput, when
   compared with sending an ACK for each incoming data segment.

    I think ABC (appropriate byte counting) allows the sender to
    unilaterally address that concern without needing ACK Pull
    [RFC3465].

    

    The reference to 'more rapidly get up to speed during slow-start
    without overshoot' is a bit opaque. Rather than "describing by
    reference", it needs to describe the lack of ability to send
    patterns of packets (e.g. chirps) and be able to time the gaps
    between the ACKs. At minimum, the citation should refer to Appendix
    B.4, which was the mechanism proposed to do ACK pull at the time.

    

    S.3.4 Beyond classic ACK transmission behavior

    

    It ought to mention that many link technologies (Satellite, DOCSIS,
    LTE, WiFi, ...?) do TCP ACK thinning 'cos TCP doesn't do it itself,
    but it improves performance (when the ACK stream becomes the
    bottleneck for the forward path, because many reverse paths have
    pathetic bandwidth, esp. if a parallel upload is going on). 

    

    See "ACK Scaling and Performance on AsymmetricPaths"

    https://erg.abdn.ac.uk/~downloads/ackscaling.pdf    

    

    4.2. Per-segment granularity

    

    Between per-segment and permanent, there's per-connection
    suppression. I'm not saying that would be any use, I'm just saying
    it doesn't have to be permanent.

    

    4.4 Support for enabling generic ACK ratios

    

    This reminds me of a subtle additional requirement. When you move
    from ACK pull to controlling the ACK ratio, there's an important
    distinction between a sender's packet stopping the receiver delaying
    the ACK for /that/ packet (as in ACK pull), vs. setting the
    receiver's Delayed ACK policy for /that and subsequent/ packets. 

    

    This raises the question, should the mechanism use soft state
    (repeated in every packet), or connection state (remembered by the
    receiver)? Which is hinted at in your section on "safe return to
    normal operation".x

    

    4.10+ Extra requirement: Who's in control?

    

    The receiver cannot be expected to control ACKs in any way the
    sender wants, which it will not always be able to honour anyway. So
    the semantics have to be of a hint, not a request or a command. Then
    there's the question of whether the receiver just does what it
    wants, or whether it ought to tell the sender it's not doing what it
    was asked.

    

    It might seem that the the receiver silently not doing what it's
    told is the simple case. However,  it adds complexity to anything
    trying to rely on the behaviour (e.g. the slow start examples). 

    

    

    A good first draft.

    Thank you.

    

    

    

    Bob

    

    
On 15/03/2020 09:47, Carles Gomez
      Montenegro wrote:

    

    

      
Hi Bob,

Thanks, once again, for your kind suggestions!

We agreed with your proposal below, and we published the initial version
of a new I-D [1] that has the aim that you described below (i.e.
requirements analysis plus discussion of suggested solutions).

We hope the document can be useful to analyze the problem space in a more
comprehensive approach.

Should you have further comments, please do not hesitate to let us know!

Cheers,

Carles

[1] https://tools.ietf.org/html/draft-gomez-tcpm-delack-suppr-reqs-00




      

        
Carles,

It strikes me that there is a lot of interest in doing something like
ACK-pull, but also a lot of disagreement in where to draw the line
between what to do and what not to do.

Can I suggest that a way to resolve this would be to start with an
informational requirements draft, that I am sure would be adopted as WG
business immediately given the interest. Whereas any particular choice
of mechanism at this stage would probably not get the necessary
consensus to be adopted.

The requirements draft could discuss solutions, not as a "on this we all
agree" protocol, but in terms of their pros and cons, e.g. which
mechanisms could satisfy which requirements, so they can be judged
relative to each mechanism's complexity / traversibility / usage of bits
/ etc.

I will warn you that a requirements draft could itself add years to the
process (the accurate ECN requirements did [RFC7560]). But not if we
agree to allow a solution draft to start in parallel once the
requirements are starting to converge, rather than waiting for the
requirements to go thru the full RFC process.


You might prefer to continue evangelising ack-pull as a sufficient
solution, so I don't want to say a requirements draft is the only way
forward. But you saw my comment earlier - that once you've been through
all the years of effort of getting anything changed in TCP, you
sometimes feel that you wish you'd been more ambitious than just one bit
at the start.


Bob


      

      

_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm


    

    

    
-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/

  


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To: Carles Gomez Montenegro 
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Subject: Re: [tcpm] More motivating scenarios for tcpm-ack-pull
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> On 15 Mar, 2020, at 11:38 am, Carles Gomez Montenegro =
 wrote:
>=20
> Thanks a lot for your detailed response, which helped shape our latest
> draft [1] in several ways.
>=20
> While we focus on analyzing the problem space and its requirements, it
> will be good to keep an eye on potential solutions as well, including =
the
> one you describe below. In particular, I found the idea of spacing AKP
> flags (or something similar) in order to control the desired ACK ratio =
to
> be very interesting!

I'm glad you found my comment useful.

I think one of the big takeaways from draft-gomez-tcpm-delack-suppr-reqs =
is that the sender has the most information about when, and to what =
extent, Delayed Acks are helpful, but the receiver is the point at which =
they must be implemented.  So some means to convey this information from =
sender to receiver is desirable.  The precise form of that is still open =
to debate.

And there are well-known circumstances where the receiver already has to =
interrupt or suspend Delayed Ack processing - when it notices a packet =
loss, or receives an ECN mark, for example.  I assume these would not =
change materially on a transport supporting Ack Pull or similar.

 - Jonathan Morton


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Dear all,

this mail starts a WG adoption call for
https://tools.ietf.org/html/draft-scharf-tcpm-yang-tcp-04

So I would like to solicit feedback regarding support for or objections =
against the
adoption of the document as a WG document in TCPM.

Please provide feedback before March 31st.

For the context and current state of the document, see the presentation =
sent yesterday
to the mailing list by Mahesh.

Best regards
Michael



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From nobody Mon Mar 16 14:33:13 2020
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Subject: [tcpm] WG Action: Rechartered TCP Maintenance and Minor Extensions (tcpm)
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The TCP Maintenance and Minor Extensions (tcpm) WG in the Transport Area of
the IETF has been rechartered. For additional information, please contact the
Area Directors or the WG Chairs.

TCP Maintenance and Minor Extensions (tcpm)
-----------------------------------------------------------------------
Current status: Active WG

Chairs:
  Yoshifumi Nishida 
  Michael Scharf 
  Michael Tüxen 

Assigned Area Director:
  Mirja Kühlewind 

Transport Area Directors:
  Mirja Kühlewind 
  Magnus Westerlund 

Mailing list:
  Address: tcpm@ietf.org
  To subscribe: https://www.ietf.org/mailman/listinfo/tcpm
  Archive: https://mailarchive.ietf.org/arch/browse/tcpm/

Group page: https://datatracker.ietf.org/group/tcpm/

Charter: https://datatracker.ietf.org/doc/charter-ietf-tcpm/

TCP is currently the Internet's predominant transport protocol. TCPM
is the working group within the IETF that handles small TCP changes,
i.e., minor extensions to TCP algorithms and protocol mechanisms.
The TCPM WG serves several purposes:

* The WG mostly focuses on maintenance issues (e.g., bug fixes) and
modest changes to the protocol, algorithms, and interfaces that
maintain TCP's utility.

* The WG is a venue for moving current TCP specifications along the
standards track (as community energy is available for such efforts).

* The WG maintains Multipath TCP (MPTCP) and is a home for minor
MPTCP enhancements including updates to the existing multipath
congestion control.

* The focus of the working group is TCP. In cases where small
changes are directly applicable to other transports (e.g., SCTP or
DCCP), the mappings to other transports may be specified alongside
that for TCP, but other significant additions and changes to other
transports are not in scope.

TCPM also provides a venue for standardization of incremental
enhancements of TCP's standard congestion control. In addition,
TCPM may document alternative TCP congestion control algorithms
that are known to be widely deployed, and that are considered
safe for large-scale deployment in the Internet. Changes of algorithms
may require additional review by the IRTF Congestion Control
Research Group (ICCRG). Fundamental changes to TCP or its congestion
control algorithms (e.g., departure from loss-based congestion
control) will be handled by other working groups or will require
rechartering.

TCP's congestion control algorithms are the model followed by
other IETF transports (e.g., SCTP or DCCP), which are standardized in
other working groups, such as the Transport Area WG (tsvwg). In the
past, the IETF has worked on several documents about algorithms that
are specified for multiple protocols (e.g., TCP and SCTP) in the
same document. Which WG shepherds such documents will be determined
on a case-by-case basis. In any case, the TCPM WG will remain in
close contact with other relevant WGs working on these protocols to
ensure openness and stringent review from all angles.

New TCPM milestones that fall within the scope specified within the
charter can be added after consensus on acceptance in the working
group and approval by the responsible Area Director.

Milestones:

  Apr 2020 - Submit document on a time-based fast loss detection algorithm
  for TCP to the IESG for publication as a Proposed Standard RFC

  May 2020 - Submit document on Retransmission Timeout Considerations as Best
  Current Practice RFC

  Jun 2020 - Submit RFC793bis document to the IESG for publication as
  Internet Standard

  Jul 2020 - Submit document on TCP Control Block Interdependence to the IESG
  for publication as Informational RFC

  Aug 2020 - Submit specification of more accurate ECN feedback in TCP to the
  IESG for publication as an Experimental RFC

  Sep 2020 - Submit document on adding Explicit Congestion Notification (ECN)
  to TCP Control Packets to the IESG for publication as Experimental RFC

  Nov 2020 - Submit document on a TCP Extended Data Offset Option to the IESG
  as a Proposed Standard RFC




From nobody Mon Mar 16 23:19:16 2020
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From: 
To: Michael Tuexen , tcpm IETF list 
CC: "draft-scharf-tcpm-yang-tcp@ietf.org" 
Thread-Topic: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Hi Michael, all,=20

I support adopting this draft. =20

Cheers,
Med

> -----Message d'origine-----
> De=A0: tcpm [mailto:tcpm-bounces@ietf.org] De la part de Michael Tuexen
> Envoy=E9=A0: lundi 16 mars 2020 21:44
> =C0=A0: tcpm IETF list
> Cc=A0: draft-scharf-tcpm-yang-tcp@ietf.org
> Objet=A0: [tcpm] Request for feedback on WG adoption of draft-scharf-
> tcpm-yang-tcp-04
>=20
> Dear all,
>=20
> this mail starts a WG adoption call for
> https://tools.ietf.org/html/draft-scharf-tcpm-yang-tcp-04
>=20
> So I would like to solicit feedback regarding support for or
> objections against the adoption of the document as a WG document in
> TCPM.
>=20
> Please provide feedback before March 31st.
>=20
> For the context and current state of the document, see the
> presentation sent yesterday to the mailing list by Mahesh.
>=20
> Best regards
> Michael
>=20


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From: "Scharf, Michael" 
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From: "Scharf, Michael" 
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Subject: [tcpm] FW: Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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On Thu, 12 Mar 2020, Bob Briscoe wrote:

> On 11/03/2020 12:37, Ilpo J=E4rvinen wrote:
> >
> > Here's the option format with the extra octet:
> >
> >      0                   1                   2                   3
> >      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     |  Kind =3D TBD1  |  Length =3D 11  | Reserved  |Cnt|   EE0B fiel=
d  |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     | EE0B (cont'd)                 |           ECEB field          |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >     |               |                  EE1B field                   |
> >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >
> > Cnt indicates the counter (IP-ECN field value) from the last received
> > packet. The receiver incremented this counter with this ACK. The coun=
ter
> > value might have not increased if the payload length was zero but
> > a subsequent packet would increase the same counter if IP-ECN field
> > remains the same.
> >
> > The octet containing Cnt MUST be included when any byte counter is
> > included.
> I don't think this needs to be a MUST at all. The most important thing=20
> is to include the Cnt bits when there are no other counters (the case i=
n=20
> the sentences below).

Well, the point was just to say that if byte counters are there, then the=20
Cnt must be there too. Any discussion below from my side about the case
where there's just Cnt but no associated byte counter is written just
in an attempt to "spec it fully" (and should be read in that light).

> > It MAY be left out otherwise.
> I think you are referring to an empty option on the SYN/ACK here (to=20
> declare that the server is sending options). I can't think of any other=20
> use for an empty option.

You asked me to answer whether it's always sent so I did try answer that
with this. The point was to say that Cnt needs to not be sent if byte=20
counters are not sent nor does Cnt require option to be always sent which=20
I forgot to explicitly state.

I just tried to also collect my thoughts about the cases where only Cnt=20
appear but not byte counters although that was not the main idea (just to
"fully spec it"). But while writing them down I realized that in (nearly)=20
ACK lossless environments the Cnt alone could indicate the IP-ECN edges
which probably affected the text too much and just created more confusion=
.

> > If an AccECN option without bytes
> > counters is increased but Cnt value is included and changed, the send=
er
> > switches to the indicated counter (but cannot sync counters which may =
be
> > be somewhat off in case of ACK losses).
>
> This last sentence is the most important part that you hadn't stated be=
fore.
>  =A0=A0=A0 (I assume there's a typo: s/increased/included/.)

Yes, although I'd say "received" now that you note it.

> But you haven't said whether it's MUST or SHOULD (except the previous=20
> sentence says that it MAY be left out).
> It cannot be a MUST (in case there isn't any option space on a=20
> particular packet).
> If we were to go in this direction, this sentence surely ought be a=20
> "SHOULD" with the same strength as the "SHOULD" for Change-Triggered AC=
Ks.

Yes, the intention was to say that Cnt MUST be included to ACKs that have=20
any byte counters. And therefore "SHOULD" be included to change-triggered=20
ACKs.

The sender receiving Cnt MUST use the newest Cnt value for estimating=20
which byte counter is incrementing on a subsequent ACK if it contains no=20
AccECN option.

> > If the Option is sent in a change-triggered ACK, the Cnt field will
> > differ from the previously sent value. For other ACKs the option, Cnt =
is
> > the same as previously. As a new AccECN options should be sent in
> > the next change-triggered ACK, the IP-ECN field edges are captured.
> >
> > Now, even if there were any number of ACK losses prior to receiving
> > such an AccECN option, the sender can immediately sync with the recei=
ver's
> > state
>
> I think you only mean the receiver's state relating to which ACK counte=
r=20
> is currently changing. The state of the counters can still be wrong, du=
e=20
> to previous ACK losses.

...If the byte counters are not included, that may occur due to ACK=20
losses, yes. The delta will be correct though.

In my mind model, however, byte counters and appearance of Cnt are more=20
tightly coupled than you seem to think. It is possible to see/send Cnt=20
alone but that never was my intention to endorse (but as mentioned above,
I can see some use case for Cnt to appear alone).

> > and knows what counter the receiver will be increasing, no need to
> > guess that based on any byte counter delta (on the next ACK if it
> > doesn't contain AccECN option).
> >
> > The main point with Cnt is to help the sender to do more accurate
> > estimation in the cases where ACKs without AccECN option arrive.
> > As such estimation needs only run on ACKs, the Cnt information does
> > not require sending extra ACKs at any point of time. In fact, the
> > change-triggered ACKs requirement could even be relaxed with it
> > because together the byte counters and Cnt sync the AccECN state
> > such that knowing the exact point of the IP-ECN field edge is no
> > longer as necessary as earlier.
>
> I believe you are saying that the meaning of Cnt on an acceptable ACK i=
s=20
> twofold:
> 1) For the past:
>  =A0=A0=A0 * If the byte counter indicated by Cnt is absent from this o=
ption,=20
> consider the new bytes acked by this packet to have incremented that=20
> counter.
>  =A0=A0=A0 * If the byte counter indicated by Cnt is present on this op=
tion=20
> ??? (Does it have any other use for the past?)
> 2) For the future:
>  =A0=A0=A0 * If there is no AccECN Option on a subsequent acceptable AC=
K that=20
> acknowledges new data, consider the new bytes acked by that packet to=20
> have incremented the byte counter indicated by the last seen value of C=
nt.

I was only trying to solve case #2.

> In the presence of ACK loss:
> * Meaning#1 is much more useful.
> * Meaning #2 is less useful, because if ACKs are being thinned or lost,=20
> the value of Cnt most recently received by the Data Sender won't=20
> necessarily be the one most recently sent by the Data Receiver.

I disagree this evaluation, #2 is the reason why I proposed this.
The cases related to #1 are just things that are a side-product of
not being able to fit the Cnt and byte counters always to the limited
option space.

If ACKs are lost, Cnt definately is not "less useful". With Cnt the=20
situation is "equal or better". ACK+Option losses will obviously have an=20
impact on any estimation heuristic. Cnt+byte counters, however, gets
immediately back on track when ACK+Option gets through at some point afte=
r=20
the loss, unlike the other approaches that so far have been on the table.
I cannot see how estimates from the other approaches could be "more=20
useful" than Cnt assisted approach in the ACK thinning / ACK loss cases.

> Assessment:
> * Meaning #2: To put it ironically, this scheme tries to solve the=20
> problem of losing ACKs that say which counter will change in future, by=20
> introducing a field on an ACK that says which counter will change in=20
> future. But the ACK carrying this new field is just as likely to be los=
t=20
> as the old way.

Of course but when ACK with Cnt+byte counters get through, the state is=20
immediately brought up to date and the sender knows how to continue on=20
the next ACK if that doesn't contain AccECN option.

> * Meaning #1: Then the question has to be, if Cnt is most useful on a=20
> packet without the associated counter (meaning#1), then why not include=20
> that counter? IOW, Cnt consumes 3B to save 5B (or sometimes to save 8B)=20
> (including the overhead of the option kind and length). And note that=20
> Cnt is still ambiguous, whereas including the actual counter is unambig=
uous.

No, from estimation point of view (on the next ACK without AccECN option)=20
Cnt is unambiguous whereas counters aren't. If you bring ACK losses=20
again on the table here, then you should explain how the other estimation=20
approach would outperform because I cannot see how they could less=20
ambiguous (other than by chance). But I guess your comment mainly stemmed=20
from misconcept that I was proposing to send Cnt w/o byte counters.

> I guess the idea of Cnt arose from reading all the SHOULDs about when t=
o=20
> send an AccECN Option as if they might not be adhered to. So this=20
> additional 1B field is really only solving a problem where there is not=20
> space for 5B or 8B, but there is space for 3B.

No. The idea of Cnt came from the requirement to include AccECN not only=20
on Change-Triggered ACKs but the next ACK too to more robustly communicat=
e=20
which counter is increasing. You were somewhat against consuming those=20
extra bytes for sending the option second time.

> > If Cnt is zero, the receiver got a packet with non-ECT and no counter
> > is increasing as a result of the ACK or subsequent ACKs until next
> > the AccECN option arrival.
> More precisely, I think you mean that all the new bytes ACK'd by this=20
> packet were Not-ECT.
> That's useful. Without Cnt this is only really possible by sending an=20
> option with all three counters then sending one later with the counters=20
> unchanged.

Agreed, for this case it would also provide slightly more information=20
than the counters alone.

> > Since the byte counter indicated with Cnt field is typically increasi=
ng,
> > it would be possible to make the Cnt value dual purpose and use it to
> > indicate which counter appears first in the Option (if there are any
> > counters in the first place). This would partically resolve Michael's
> > concern about the field ordering. Other counters that have changed si=
nce
> > the receiver sent last AccECN option should be included after the
> > first field (in some order, specifying the order of the remaining
> > fields is beyond this Cnt proposal).
>
> As you say, we don't have to do this.
> I'm yet to be convinced of the value of allowing the field order to=20
> change on each packet, just because we want the field order to be able=20
> to be changed for each connection.

I came across recently something related to this when creating a=20
packetdrill tests for shrinking the option size due to other options.
The receiver couldn't send the AccECN option because all modified counter=
s=20
didn't fit. In the test was just "randomly" using ECT0, CE, ECT1 packets=20
to create edges while SACK blocks indicated holes, alignment+TS+SACK=20
blocks ate so much space that the last byte counter (ECT1 in this cases)=20
no longer fit to the option so AccECN degrades to optionless mode until=20
SACK blocks are no longer required (typically, that would be until=20
recovery ends). Maybe not a big problem for use cases with only two ECN I=
P=20
field values but perhaps still worth to consider if something needs to be=20
done or not.

--
 i.
--=_script-19283-1584740650-0001-2--


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Date: Fri, 20 Mar 2020 16:14:42 -0700
From: Benjamin Kaduk 
To: mohamed.boucadair@orange.com
Cc: The IESG , "draft-ietf-tcpm-converters@ietf.org" , "tcpm-chairs@ietf.org" , "tcpm@ietf.org" , Michael Scharf 
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Subject: Re: [tcpm] Benjamin Kaduk's Discuss on draft-ietf-tcpm-converters-17: (with DISCUSS and COMMENT)
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Hi Med,

Thanks for the updates in the -18, and sorry for the delayed response!
Adding the applicability statement covers my main concerns, which regarded
the disparity between [protection provided by the network in the
first-party case] and [protection provided by TBD in the third-party case].
By limiting to the first case, concerns about imposing requiremnets without
guidance on how to achieve them evaporate.

I'll start with a few comments that strike me from reading the diff (and
skimming the -18), with further notes inline.

While the applicability statement in Section 1.3 alleviates most of my
concerns, it seems a little strange to say that the converter MUST be
provided by the same entity as connectivity service and then go on in the
next paragraph to talk about converters deployed by third parties.  Perhaps
it should be "any future deployment" by third parties?

Thank you for referring to the need for an application profile for
TLS 1.3 0-RTT data usage!

Section 2

W.r.t. using a DNS name vs. IP address to identify the converter, and only
allowing an IP address for the destination server, are there any
considerations regarding "split-DNS" or private IP address that are worth
mentioning?  (I didn't think of any off the top of my head, but would
appreciate a bit more brainstorming.)

Section 4.1

   A Client is configured, through means that are outside the scope of
   this document, with the names and/or the addresses of one or more
   Transport Converters and the TCP extensions that they support.  The

We have some limited discovery for converter support for TCP extensions;
is it 100% required to know this through out-of-band means?

Section 9.1, second paragraph, first line s/Convert/Converter/, I think?


On Thu, Mar 05, 2020 at 01:20:30PM +0000, mohamed.boucadair@orange.com wrote:
> Hi Ben, 
> 
> Thank you for the detailed review. Much appreciated!
> 
> Please see inline. 
> 
> Cheers,
> Med
> 
> > -----Message d'origine-----
> > De: Benjamin Kaduk via Datatracker [mailto:noreply@ietf.org]
> > Envoy: jeudi 5 mars 2020 10:46
> > : The IESG
> > Cc: draft-ietf-tcpm-converters@ietf.org; tcpm-chairs@ietf.org;
> > tcpm@ietf.org; Michael Scharf; michael.scharf@hs-esslingen.de
> > Objet: Benjamin Kaduk's Discuss on draft-ietf-tcpm-converters-17:
> > (with DISCUSS and COMMENT)
> > 
> > Benjamin Kaduk has entered the following ballot position for
> > draft-ietf-tcpm-converters-17: Discuss
> > 
> > When responding, please keep the subject line intact and reply to all
> > email addresses included in the To and CC lines. (Feel free to cut
> > this
> > introductory paragraph, however.)
> > 
> > 
> > Please refer to https://www.ietf.org/iesg/statement/discuss-
> > criteria.html
> > for more information about IESG DISCUSS and COMMENT positions.
> > 
> > 
> > The document, along with other ballot positions, can be found here:
> > https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/
> > 
> > 
> > 
> > ----------------------------------------------------------------------
> > DISCUSS:
> > ----------------------------------------------------------------------
> > 
> > I agree with Roman, and present a somewhat different take on some of
> > the
> > key aspects of the scoping discussion.
> > 
> > I have pretty fundamental concerns about describing this protocol as a
> > "0-RTT" service when it both requires strong mutual
> > authentication/authorization of the communicating endpoints and relies
> > on the (local) network to provide those properties.  If IP in general
> > provided the kind of mutual authentication assumed here, the internet
> > would be a much more secure place!  Unfortunately, it does not and I
> > think this document does its readers a disservice by transparently
> > assuming that it does (in the main body of text; the security
> > considerations do touch on the requisite details).  It would be better
> > to discuss the proxy protocol separately from the deployment
> > considerations that allow it to be used without additional set-up in
> > specific deployment scenarios.
> > 
> > And that's only when considering the client authenticating the server!
> > Mutual authentication also requires the server to authenticate the
> > client and be able to make authorization decisions based upon that
> > authenticated identity.  The deployment model presented here seems to
> > imply a very tight coupling between the Transport Converter operator
> > and
> > the network service provider (in order to determine, based on client
> > IP
> > address, the authenticated client identity and access an authorization
> > database); this seems to make it incompatible with the stated
> > possibility of using a third-party Transport Converter.
> > Additionally, it raises some questions along the lines of
> > draft-arkko-iab-internet-consolidation and draft-iab-for-the-users.
> > 
> > The sketch of a solution for more open network environments in Section
> > 9.2 is insecure (once a Cookie is generated and sent once, it can be
> > freely replayed by an attacker during the Cookie lifetime, which
> > defeats
> > the authorization requirement of the convert protocol).  Either fix it
> > or remove it entirely.
> > 
> 
> [Med] I hope this one is resolved with the outcome of the Roman's DISCUSS. 

It seems to be, in the essence of it.
I would prefer to see a note at the end of the second paragraph of Section
9.2 that mentions how an attacker able to observe traffic in the internal
realm could observe the authentication cookie and reuse it to ill effect.
(That is, this scenario assumes that the innards of the internal realm
network are physically secure, even if attachment by un-vetted devices is
allowed.)

> > Please resolve the internal inconsistency in Section 6.2.4 which says
> > that TCP option Kind 0 MUST NOT appear in the list but then goes on to
> > say that the list is padded with zeros to a 32-bit boundary.  (There
> > is
> > no listed requirement that the options are listed in any given order,
> > which would be needed to assign a boundary between "listed options"
> > and
> > "padding".)
> 
> [Med] I see your point. Will be fixed. 

It is fixed as far as the discuss goes, yes.  I might consider adding a
note about the nominal ambiguity between 0 as padding and 0 as option kind,
though of course there should be no practical issue.

> > 
> > Why do we need the Cookie TLV at all if the underlying local network
> > supplies all the authentication and authorization that the protocol
> > needs?
> > 
> 
> [Med] We had lengthy discussion about this in both MTPCP/TCPM. The WG wanted to have the same protection as TFO for inserting data in the SYN.

Okay.  I would prefer to not have the cookie TLV to reiterate that the
network is assumed to provide this protection, but whether this is 100%
reliable or guaranteed requires some careful analysis that it's not worth
trying to do at this point.

> > Section 1.2 says that the Convert Protocol "is an application-layer
> > protocol which uses a dedicated TCP port number", but the IANA request
> > in Section 10.1 is for a service name without fixed port number.
> > 
> 
> [Med] s/dedicated port number/specific port number.
> 
> How that specific port number is known to clients is part of the service discovery and is as such out of scope.

Sure.  (Would "specific port number on the given host" be better? I can't
say, myself.)

> > 
> > ----------------------------------------------------------------------
> > COMMENT:
> > ----------------------------------------------------------------------
> > 
> > Section 1.1
> > 
> >    scheme can be applied independently on clients and servers.  Other
> >    improvements such as Selective Acknowledgments [RFC2018] or large
> >    windows [RFC7323] require a new TCP option or to change the
> > semantics
> >    of some fields in the TCP header.  These modifications must be
> >    deployed on both clients and servers to be actually used on the
> >    Internet.  Experience with the latter TCP extensions reveals that
> >    their deployment can require many years.  Fukuda reports in
> > 
> > Do we want to say "the latter" or "the latter class of"?
> 
> [Med] Not sure what "class of" TCP option would mean here.

It would be "class of TCP extension", I think -- ones that require a new
TCP option or to change the semantics of a header field (i.e., not ones
that can be applied independently on clients and servers).

> > 
> >    Timestamps.  [ANRW17] describes measurements showing that TCP Fast
> >    Open (TFO) [RFC7413] is still not widely deployed.
> > 
> > Perhaps people are turned off by its privacy properties or lack
> > confidence that their data can tolerate replay?
> 
> [Med] The measurements focus on the server's side. That is, the client presents the TFO but the negotiation fails. 

Sure.  I'm proposing potential reasons for server operators to be
disinclined to support TFO even if they are capable of agile deployment
modes for protocol features..

>   This is not the most
> > compelling example of a TCP feature that everyone should be using...
> 
> [Med] Those willing to optimize the connection delay may be interested. Will add pointers for the lack of support of other TCP options (e.g., MPTCP).

Thanks!

> > 
> >    More recently, 5G bonding experimentation has been conducted into
> >    global range of the incumbent 4G (LTE) connectivity using newly
> >    devised clients and a Multipath TCP proxy.  Even if the 5G and the
> > 4G
> >    bonding relying upon Multipath TCP increases the bandwidth, it is
> > as
> > 
> > nit: the grammar is not right here; either "to increase" or "reliance
> > upon", depending on the intended meaning, I think.
> 
> [Med] Changed to:
> 
> "Even if the 5G and the 4G bonding (that relies upon Multipath TCP) increases the bandwidth"
> 
> > 
> >    mobile core.  In order to handle URLLC (Ultra Reliable Low Latency
> >    Communication) for the next generation mobile network, Multipath
> > TCP
> >    and its proxy mechanism such as the one used to provide Access
> >    Traffic Steering, Switching, and Splitting (ATSSS) must be
> > optimized
> >    to reduce latency [TS23501].
> > 
> > There are a lot of missing steps of reasoning here if we want to claim
> > that this is a technical fact vs. marketing material.
> 
> [Med] This is not a claim. This is a requirement for the design of ATSSS: observing a delay before making use of a connection is to be avoided.   

Er, sorry; I was implicitly tying in to the secdir review thread where it
was asserted (hence, my use of "claim") that the content in the first 20
pages were technical facts.  The connections between URLLC needing MPTCP
and proxy mechanisms, and the connection between URLCC and the need for
optimization to reduce latency, are not clearly made just from this text.
(Perhaps [TS23501] does; I didn't get a chance to read it.)

> > 
> > Section 1.2
> > 
> >    The Convert Protocol provides 0-RTT (Zero Round-Trip Time)
> > conversion
> >    service since no extra delay is induced by the protocol compared to
> >    connections that are not proxied.  Particularly, the Convert
> > Protocol
> >    does not require extra signaling setup delays before making use of
> >    the conversion service.  The Convert Protocol does not require any
> > 
> > In tightly controlled network environments where MAC can be assumed to
> > provide sufficient authentication, authorization, and access-control
> > functionality to meet the security needs of the proxy protocol;
> 
> [Med] Which is the deployment model of this spec. I hope this is now more clear with the new "Applicability scope" discussed with Roman.
> 
>  this
> > cannot hold when additional mutual authentication schemes are
> > required,
> > as envisioned in Section 9.2
> 
> [Med] I'm not sure about this because this is out of scope of this version. 
> 
> If TLS1.3 is used for example, a connection may be established at bootstrap with the Transport Converter, and then use 0-RTT early data when the user want to solicit the converter. A more serious analysis should be done to assess if the use of early data is safe but that is for future work. 

I am pretty sure that TLS 1.3 0-RTT is not going to be safe for the general
case of things one might want to use TCP Convert for.

> 
> > 
> >    The Transport Converter adheres to the main principles drawn in
> >    [RFC1919]. 
> 
> [Med] s/principles drawn in /steps drawn in Section 3 of. 
> 
>  In particular, a Transport Converter achieves the
> > 
> > Er, which principles are those?  RFC 1919 is a 35-page document
> > entitiled "Classical versus Transparent IP proxies" that facially
> > seems
> > to be a  comparison and not a declaration of guiding principles.
> > 
> >    The main advantage of network-assisted conversion services is that
> >    they enable new TCP extensions to be used on a subset of the path
> >    between endpoints, which encourages the deployment of these
> > 
> > If those are the extensions that the conversion-service provider is
> > interested in.  Are other extensions blocked due to inactivity on the
> > part of the provider?
> 
> [Med] A host can always bypass the converter so blocking an option at the converter does not prevent a host to make use of that option is supported by the server. 
> 
> > 
> > Section 2
> > 
> >    destination.  In today's Internet, latency is a important metric
> > and
> >    various protocols have ben tuned to reduce their latency
> > 
> > nit: s/ben/been/  "Please don't tune me!"
> > 
> 
> [Med] :-) Fixed. 
> 
> 
> > Section 4.1
> > 
> >    A connection can be initiated from both sides of the Transport
> >    Converter (Internet-facing interface, customer-facing interface).
> > 
> > How does the internet-facing-initiated case work?  Does the client
> > have
> > to register?
> 
> [Med] The client has to create a state using PCP (RFC6887) for example that it communicates to the remote peer. Once a SYN matching that state is received by the converter, the converter will use Convert to assist the connection.  These details are discussed in Section 5.2.
> 
> > 
> >    Transport Converters can be operated by network operators or third
> >    parties.  Nevertheless, this document focuses on the single
> > 
> > I'm not convinced that the present document actually describes how to
> > use a third-party-run transport converter in a secure fashion.
> 
> [Med] This text is now removed. Please refer to the discussion with Roman. 
> 
> > 
> >    A Client is configured, through means that are outside the scope of
> >    this document, with the names and/or the addresses of one or more
> >    Transport Converters and the TCP extensions that they support.  The
> > 
> > Using names rather than addresses adds a "secure DNS" requirement to
> > the
> > existing assumptions of local-network security.
> 
> [Med] Sure, but service discovery is out of scope. 
> 
> > 
> >    connections.  This encourages the deployment of new TCP extensions
> >    until they are widely supported by servers, in particular.
> > 
> > This document has not yet shown me much to indicate that transparent
> > converter implementors are more incentivized to implement new TCP
> > extensions than third-party server operators are.
> 
> [Med] The protocol is adopted by 3GPP for their ATSSS function, for example.  
> 
> > 
> >    Similar to SOCKS, the architecture does not interfere with end-to-
> > end
> >    TLS connections [RFC8446] between the Client and the Server
> >    (Figure 3).  In other words, end-to-end TLS is supported in the
> > 
> > Why is TLS specifically noteworthy?  Does this not apply to all
> > higher-level protocols?
> 
> [Med] We discuss in the security section that TLS can also be used between the client and the converter. 
> 
> > 
> >    It is out of scope of this document to elaborate on specific
> >    considerations related to the use of TLS in the Client-Converter
> >    connection leg to exchange Convert messages (in addition to the
> > end-
> >    to-end TLS connection).
> > 
> > Because that can't be done in 0-RTT in the general case?
> 
> [Med] It can with 0-RTT early data with TLS1.3, but that require more analysis. 
> 
> > 
> > Section 4.2
> > 
> >    Server, without experiencing an extra delay.  The Transport
> > Converter
> >    waits until the receipt of the confirmation that the Server agrees
> > to
> >    establish the connection before confirming it to the Client.
> > 
> > nit: I suggest clarifying the antecedent of "it".
> > 
> >    that SYN.  The Transport Converter receives this SYN because it is,
> >    for example, on the path between the remote host and the Client or
> > it
> >    provides address sharing service for the Client.  If the check
> > fails,
> > 
> > Is there a reference for "address sharing service"?
> 
> [Med] rfc6269#section-2. I added a pointer. 

Thanks!

> > 
> >    As discussed in [RFC7413], such change to TCP semantic raises two
> >    issues.  First, duplicate SYNs can cause problems for some
> >    applications that rely on TCP.  Second, TCP suffers from SYN
> > flooding
> > 
> > Is it really best to say "some applications" when the onus to prove
> > replay-safety on a per-protocol basis leads to a need to assume as a
> > baseline that all protocols are not compatible with TFO until proven
> > otherwise?
> > 
> 
> [Med] "some applications" was used in reference to this part of RFC7413:
> 
>   "on to accept old SYN packets with data, i.e., to restrict TFO use to
>    a class of applications (Section 6) that are tolerant of duplicate
>    SYN packets with data."
> 
> Is there a particular change that you would like to be implemented? Thanks.

I'd consider "duplicate SYNs can cause problems for applications that rely
on TCP; whether or not a given application is affected dependes on the
details of that application protocol".  Maybe it's too wordy, though.

> >    terminate the downstream connection by using FIN packets.  If the
> >    downstream connection terminates with the exchange of FIN packets,
> > 
> > Why do we have "RST segment" in the previous paragraph but "FIN
> > packet"
> > here?
> 
> [Med] Because this one is about the behavior for terminating connection with FIN. Is there any issue?

I was just commenting on "segment" vs. "packet" -- e.g., RFC 793 refers to
"FIN segments" but not "FIN packets".

> > 
> > Section 4.3
> > 
> >         * Lifetime is the validity lifetime of the entry as assigned
> >           by the Converter.
> > 
> > Conceptually a lifetime is a "time to survive relative to a given
> > reference time".  If the reference time is "now", this lifetime would
> > need to be continuously updated; if not, don't we need to also store
> > the
> > reference time?  (Alternately, just store the expiration time and not
> > the lifetime.)
> 
> [Med] I updated the text as follows: 
> 
>      * Lifetime is a timer that tracks the remaining lifetime of 
>        the entry as assigned by the Converter. When the timer 
>        expires, the entry is deleted.
> 
> How this is tracked is implementation-specific. 

Indeed.  Thanks for the update.

> > 
> > Section 5.1
> > 
> > Do we want to say anything about (end-to-end?) MPTCP operation with
> > the
> > Transport Converter in the middle?  Does it need to do anything other
> > than just pass packets (and maybe swap out addresses)?
> > 
> 
> [Med] IMO, we don't have much to say here. 

Okay.  (This is not my area of expertise...)

> 
> > Section 5.2
> > 
> >    address, external port number).  The external IP address and
> > external
> >    port number will be then advertised using an out-of-band mechanism
> > so
> >    that remote hosts can initiate TCP connections to the Client via
> > the
> >    Converter.  Note that the external and internal information may be
> > 
> > Advertised by the Transport Converter or the Client? 
> 
> [Med] s/then advertised using/then advertised by the client (or the user) using
> 
>  (We leave it
> > implicit that the allocated external address/port will be communicated
> > back to the client by PCP.)
> 
> [Med] I added this NEW sentence: 
> 
> The external IP address, external port number, and assigned lifetime are returned back the Client in the PCP response.  
> 
> > 
> >    is found, the Converter silently ignores the message.  If an entry
> > is
> >    found, the Converter inserts an MP_CAPABLE option and Connect TLV
> > in
> >    the SYN packet, rewrites the source IP address to one of its IP
> >    addresses and, eventually, the destination IP address and port
> > number
> >    in accordance with the information stored in the mapping.  SYN+ACK
> > 
> > Why "eventually"?
> 
> [Med] because the converter may operate in an address preservation mode. In such case, the same address will be used.
> 
> > 
> >    It is out of scope of this document to define specific Convert TLVs
> >    to manage incoming connections.  These TLVs can be defined in a
> >    separate document.
> > 
> > It seems a little bit of a bait-and-switch to do so, given that the
> > discussion of the example in Figure 6 explicitly says "the Tranport
> > Convert [sic] inserts a TLV message that indicates the source address
> > and port number of the remote host".
> > 
> 
> [Med] The discussion related to Figure 6 is correct. This note is about defining Convert TLVs to accommodate deployment where PCP is not supported. These TLVs (if defined) will basically mimic PCP requests. 

Ah, I see what is meant, now.

> > Section 6
> > 
> >    Convert messages may appear only in a SYN, SYN+ACK, or in an ACK
> > that
> >    is sent shortly after the SYN+ACK.
> > 
> > Can we be more precise about "shortly after the SYN+ACK" (e.g.,
> > "acknowledging the SYN")?
> 
> [Med] Will think about this one more.  

It looks like we just dropped the "that is sent shortly after the SYN+ACK"
entirely.  IIUC, ACK recurs throughout the lifetime of the connection, so
this would be allowing convert messages to be a recurring event.
Or do I misunderstand the TCP terminology relating to the three-way
handshake vs. "normal operation"?
Would it be accurate to say "the ACK of the three-way handshake"?

> > 
> > Section 6.1
> > 
> > Was any consideration given to including a "magic string" in the fixed
> > header, to provide additional protection against misconfiguration
> > about
> > whether Convert is to be used on a given connection?
> 
> [Med] Yes. This was discussed here: https://tools.ietf.org/html/draft-boucadair-mptcp-plain-mode-10#section-5.1  
> 
>    o  Magic Number: This field MUST be set to "0xFAA8 0xFAA8" to
>       indicate this is an MP_CONVERT Information Element.  This field is
>       meant to unambiguously distinguish any data supplied by an
>       application from the one injected by an MCP.  Other magic numbers
>       are considered by the authors (e.g., 64 bits that include in
>       addition to "0xFAA8 0xFAA8" 32 bits to enclose the RFC number).
> 
> But we abandoned that since we decided to use a dedicated port number. 
> 
> > 
> >    The Unassigned field MUST be set to zero in this version of the
> >    protocol.  These bits are available for future use.
> > 
> > But only in a future version, the way this is defined.  (That is,
> > ruling
> > out using those bits as extension points within version 1.)
> 
> [Med] I have already updated that text to address one of the comment from Eric. The NEW text is as follows: 
> 
> "The Unassigned field MUST be set to zero and MUST be ignored on receipt."

Sounds good :)

> > 
> > Section 6.2.2
> > 
> >    capabilities.  Assuming the Client is authorized to invoke the
> >    Transport Converter, the latter replies with the Supported TCP
> >    Extensions TLV (Section 6.2.4).
> > 
> > Just to confirm: based on this design, the Transport Converter
> > currently
> > has nothing other than the Client IP address to use as input to this
> > authorization decision?
> > 
> 
> [Med] It can rely on the IP address, IMSI, and other inputs discussed in Section 9.5.

Yes ... though as Section 9.5 discusses, the TCP Converter itself (as a
logical function) does not actually need to *do* anything when the
non-IP-address inputs are used.  But if it's deployed by the same entity
that runs the network, relying on the network is fine, so with the
applicability statement there's no need to change this text.

> > Section 6.2.5
> > 
> >    We distinguish two types of Connect TLV based on their length: (1)
> >    the Base Connect TLV has a length of 20 bytes and contains a remote
> > 
> > Which is to say, a Length field containing the value 5.
> > 
> 
> [Med] Yes. Changed to "5 (i.e., 20 bytes)"
> 
> > 
> > I'm confused about the default options semantics.  First we say that
> > the
> > default options are those advertised in the Supported TCP Extensions
> > TLV, which would seem to imply that the converter doesn't support any
> > extensions that are not listed there.  But then we go on to say that
> > for
> > an Extended Connect TLV, the options contained in the TLV are
> > *additional* options that are *added* to the default set of options
> > ...
> > but only if the converter supports those options.  But if it supports
> > an
> > option, wouldn't it already be in the default list, since the default
> > list is the list of supported options?
> 
> [Med] Ben, which part of this text is confusing: 
> 
>    Upon reception of an Extended Connect TLV, a Transport Converter
>    first checks whether it supports the TCP Options listed in the 'TCP
>    Options' field.  If not, it returns an error message (Section 6.2.8).
>    If the above check succeeded and absent any rate limit policy or
>    resource exhaustion conditions, a Transport Converter MUST attempt to
>    establish a connection to the address and port that it contains.  It
>    MUST include in the SYN that it sends to the Server the options
>    listed in the 'TCP Options' sub-field and the TCP options that it
>    would have used according to its local policies.  For the TCP options
>    that are included in the TCP Options field without an optional value,
>    the Transport Converter MUST generate its own value.  For the TCP
>    options that are included in the 'TCP Options' field with an optional
>    value, it MUST copy the entire option in the SYN sent to the remote
>    server.  This procedure is designed with TFO in mind.  Particularly,
>    this procedure allows to successfully exchange a TFO Cookie between
>    the client and the server.

This part is clear; I'm not sure I understand how it interacts with
behaviors described elsewhere.  Perhaps I glossed over too quickly the
difference between Base Connect and Extended Connect -- IIUC, in the
former, the converter uses its own built-in ("default") list of options for
the upstream connection.  For the Extended Connect case, though, is the
converter intended to *only* use the options provided by the client (i.e.,
so the client can implicitly direct the convert to *not* use a given
option)?  I was assuming that "and the TCP options that it would have used
according to its local policies" meant basically the same list of options
that it would use for a Base Connect operation.  If those are also "the
options that it advertises in the Supported TCP Extensions TLV" (per the
previous paragraph), then I am having trouble coming up with a scenario in
which the "MUST include in the SYN [...] the options listed in the 'TCP
Options' sub-field" could require the converter to include an option that
would not have been included even in the absence of that requirement (that
is, by virtue of being in the converter's default list).

There are a number of places in the above where I could be making a bad
assumption; hopefully my explanation is clear enough to locate where that's
happening.

> 
>   The way it's currently worded,
> > the extended connect TLV seems only useful for specifying precise
> > values
> > for options that take a value, but not for adding entirely new
> > options.
> 
> [Med] Yes. Options that aren't supported by the converter will be rejected with "unsupported option" error. 
> 
> > 
> > Section 6.2.6
> > 
> >    by the Server in the SYN+ACK packet.  A Transport Converter MUST
> >    return this TLV if the Client sent an Extended Connect TLV and the
> >    connection was accepted by the server.
> > 
> > Is the converter allowed to return this option if a basic connect was
> > used?  Should the converter always attempt to return this option?
> 
> [Med] No, this is only for TCP option are negotiated end-to-end (e.g., TFO). 

Is there any value in saying "MUST NOT return this TLV if the client sent a
Base Connect TLV"?

> > 
> > Section 6.2.7
> > 
> >    the Client.  This Cookie can be configured on the Client by means
> >    that are outside of this document or provided by the Transport
> >    Converter as follows.
> > 
> > [But not as immediately follows; there's other content in between.]
> 
> [Med] deleted "as follows".
> 
> > 
> > Section 6.2.8
> > 
> >    An Error TLV can be included in the SYN+ACK or an ACK sent shortly
> >    after the SYN+ACK.
> > 
> > [same comment about "shortly after"]
> > 
> >       encoded in 8 bits.  The list of supported versions should be
> >       padded with zeros to end on a 32 bits boundary.
> > 
> > "should be"?  It's a protocol violation to not do something to make it
> > end on a 32-bit boundary, and putting anything other than zero is
> > liable
> > to cause the peer to make bad assumptions, so this seems pretty
> > mandatory to me.
> 
> [Med] Good catch. s/should/MUST. 
> 
> > 
> >       Upon receipt of this error code, the remote peer (e.g., Client)
> >       checks whether it supports one of the versions returned by the
> >       peer.  The highest common supported version MUST be used by the
> >       remote peer in subsequent exchanges with the peer.
> > 
> > There doesn't seem to be any protection against version downgrade
> > (e.g.,
> > by MITM) in this exchange.
> 
> [Med] Agree. I added this NEW text in the security section: 
> 
>    Attacks from within the network between a Client and a Transport
>    Converter are yet another actual threat.  Means to ensure that
>    illegitimate nodes cannot connect to a network should be implemented.
> 
> Should we say more?

Maybe "Attacks from within the network between a Client and a Transport
Converter (including attacks that change the protocol version) are yet
another threat"?  I don't feel strongly about the incremental addition;
your text in the -18 covers the main aspect of it.

> > 
> >       To ease troubleshooting, the value field MUST echo the received
> >       message shifted by one byte to keep to original alignment of the
> >       message.
> > 
> > I'm not sure what's meant by this "shifted" language is going to be
> > clear to all readers.  (Occurs multiple times.)
> 
> [Med] All error message share the same format: 
> 
>                       1                   2                   3
>   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>  +---------------+---------------+----------------+--------------+
>  |     Type=0x1E |     Length    |    Error Code  |  Value       |
>  +---------------+---------------+----------------+--------------+
>  | value...
> 
> Instead of starting echoing the message right after the "Error Code", we set the next byte to 0s and then insert the message: 
> 
>                       1                   2                   3
>   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>  +---------------+---------------+----------------+--------------+
>  |     Type=0x1E |     Length    |    Error Code  |  zeros       |
>  +---------------+---------------+----------------+--------------+
>  | Echo'ed message
> 
> 
> 
> > 
> >    o  Not Authorized (32): This error code indicates that the
> > Transport
> >       Converter refused to create a connection because of a lack of
> >       authorization (e.g., administratively prohibited, authorization
> >       failure, invalid Cookie TLV, etc.).  The Value field MUST be set
> > 
> > invalid or missing, IIUC.
> 
> [Med] if the cookie is missing, we send "Missing Cookie (3)".

Ah, my mistake.

-Ben

> > 
> >    o  Unsupported TCP Option (33): A TCP option that the Client
> >       requested to advertise to the final Server cannot be safely
> > used.
> > 
> > Why the mismatch between "unsupported" and "cannot be safely used"?
> 
> [Med] Because we don't know if an option that is blindly relayed does not have an impacts on other requests conversion services (hence, safe of use). 
> 
> > 
> > Section 7.6
> > 
> >    types of Connect TLV.  If such a Transport Converter receives a
> >    Connect TLV with the TCP Fast Open cookie option that does not
> >    contain a cookie, it MUST add an empty TCP Fast Open cookie option
> > in
> >    the SYN sent to the remote server.  If such a Transport Converter
> >    receives a Connect TLV with the TCP Fast Open cookie option that
> >    contains a cookie, it MUST copy the TCP Fast Open cookie option in
> >    the SYN sent to the remote server.
> > 
> > Just to check: we don't need to specify any additional behavior for
> > the
> > response (e.g., to give the client the cookie from the server), since
> > that falls out naturally from the requirement to send the Extended TCP
> > Header TLV?
> > 
> 
> [Med] The converter will relay the option received from the server. It is better to make it explicit: 
> 
> NEW:
>    If the remote server supports TFO, it responds with a SYN-ACK
>    according to the procedure in Section 4.1.2 of [RFC7413].  This
>    SYN-ACK may contain a Fast Open option with a cookie.  Upon receipt
>    of the SYN-ACK by the Converter, it relays Fast Open option with the
>    cookie to the Client.
> 
> 
> > Section 7.7
> > 
> >    A Transport Converter MUST NOT advertise the TCP-AO option
> > (Kind=29)
> >    in the Supported TCP Extensions TLV.  If a Transport Converter
> >    receives a Connect TLV that contains the TCP-AO option, it MUST
> >    reject the establishment of the connection with error code set to
> >    "Unsupported TCP Option", except if the TCP-AO-NAT option is used.
> > 
> > Perhaps a reminder that, since TCP-AO-NAT is Experimental, such usage
> > is
> > not currently defined and must be specified by some other document
> > before it can be used, would be in order?
> 
> [Med] Yes. 
> 
> > 
> > Section 9
> > 
> > An implementation needs to check that the TLVs are properly framed
> > within the boundary indicated by the Total Length in the fixed header.
> 
> [Med] Good point. Added. 
> 
> > 
> > Section 9.1
> > 
> >    processes.  As such, it MUST be protected as a core IP router
> > (e.g.,
> >    [RFC1812]).
> > 
> > nit: I don't think the grammar is quite right here; maybe "as
> > protected
> > as" or "protected as if it was".
> 
> [Med] Thanks. Fixed. 
> 
> > 
> >    This document assumes that all network attachments are managed by
> > the
> >    same administrative entity.  Therefore, enforcing anti-spoofing
> >    filters at these network ensures that hosts are not sending traffic
> >    with spoofed source IP addresses.
> > 
> > Until some network infrastructure equipment gets compromised.  (That
> > is
> > to say "ensures" may be stronger language than is merited.)
> 
> [Med] s/ensures/is a guard
> 
> > 
> > Section 9.2
> > 
> >    The Convert Protocol is intended to be used in managed networks
> > where
> >    end hosts can be identified by their IP address.
> > 
> > End hosts can always be identified by their IP address in any network
> > ... subject to spoofing.  Perhaps you mean to say "securely
> > identified"?
> 
> [Med] Indeed. 
> 
> > Section 9.4
> > 
> > I'm confused why we're talking about an illegitimate converter being
> > possible given that we assume the network is secure.
> 
> [Med] This is to record an attack against the discovery of the converter on the host side. It is fair to be recorded, IMO.
> 
> > 
> > Section 9.5
> > 
> >    The operator that manages the various network attachments
> > (including
> >    the Transport Converters) can enforce authentication and
> >    authorization policies using appropriate mechanisms.  For example,
> > a
> > 
> > I suggest "has various options for enforcing authentication and
> > authorization policies"; the current language could be misread as
> > saying
> > that such enforcement is optional.
> 
> [Med] Good suggestion. Updated. Thanks.
> 
> > 
> >    o  The network provider may enforce a policy based upon Access
> >       Control Lists (ACLs), e.g., at a Broadband Network Gateway (BNG)
> >       to control the hosts that are authorized to communicate with a
> >       Transport Converter.  These ACLs may be installed as a result of
> >       RADIUS exchanges, e.g., [I-D.boucadair-radext-tcpm-converter].
> >       This method does not require any interaction with the Transport
> >       Converter for authorization matters.
> > 
> >    o  A device that embeds a Transport Converter may also host a
> > RADIUS
> >       client that will solicit an AAA server to check whether
> >       connections received from a given source IP address are
> > authorized
> >       or not [I-D.boucadair-radext-tcpm-converter].
> > 
> > These both seem to require that the network has strong anti-spoofing
> > protections in place.
> 
> [Med] Yes. 
> 
> > 
> > Section 11.1
> > 
> > It's not entirely clear that RFC 6978 needs to be normative, given
> > that
> > we explicitly do *not* include support for that protocol in this
> > document (shunting non-standards-track tcp option support to other
> > documents).
> > 
> 
> [Med] Fair. 
> 
> > Section 11.2
> > 
> > RFC 1919 might be normative if I had a better understanding of what we
> > wanted from it (see above).
> > 
> > I'm surprised that RFC 2782 isn't normative given that SRV discovery
> > seems like the only defined way to discover the port number of the
> > convert service.
> > 
> > 
> 
> [Med] this is because service discovery is out of scope and that 2782 is cited as an example. No normative language is used. 
> 
> 


From nobody Fri Mar 20 16:18:49 2020
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To: =?UTF-8?Q?Ilpo_J=c3=a4rvinen?= 
Cc: Richard Scheffenegger , tcpm IETF list , Mirja Kuehlewind 
References: <6EC6417807D9754DA64F3087E2E2E03E2D9CCC8D@rznt8114.rznt.rzdir.fht-esslingen.de> <728285ba-0677-25f3-844f-d8f2f9781df1@bobbriscoe.net>   
From: Bob Briscoe 
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Subject: Re: [tcpm] New VersionNotificationfordraft-ietf-tcpm-accurate-ecn-11.txt
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Ilpo,

On 20/03/2020 21:44, Ilpo Jrvinen wrote:
> On Thu, 12 Mar 2020, Bob Briscoe wrote:
>
>> On 11/03/2020 12:37, Ilpo Jrvinen wrote:
>>> Here's the option format with the extra octet:
>>>
>>>       0                   1                   2                   3
>>>       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>>>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>      |  Kind = TBD1  |  Length = 11  | Reserved  |Cnt|   EE0B field  |
>>>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>      | EE0B (cont'd)                 |           ECEB field          |
>>>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>      |               |                  EE1B field                   |
>>>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>
>>> Cnt indicates the counter (IP-ECN field value) from the last received
>>> packet. The receiver incremented this counter with this ACK. The counter
>>> value might have not increased if the payload length was zero but
>>> a subsequent packet would increase the same counter if IP-ECN field
>>> remains the same.
>>>
>>> The octet containing Cnt MUST be included when any byte counter is
>>> included.
>> I don't think this needs to be a MUST at all. The most important thing
>> is to include the Cnt bits when there are no other counters (the case in
>> the sentences below).
> Well, the point was just to say that if byte counters are there, then the
> Cnt must be there too. Any discussion below from my side about the case
> where there's just Cnt but no associated byte counter is written just
> in an attempt to "spec it fully" (and should be read in that light).

[BB] I don't think you've realized the full power of your own idea.
See later about 'past' and 'future'.

>
>>> It MAY be left out otherwise.
>> I think you are referring to an empty option on the SYN/ACK here (to
>> declare that the server is sending options). I can't think of any other
>> use for an empty option.
> You asked me to answer whether it's always sent so I did try answer that
> with this. The point was to say that Cnt needs to not be sent if byte
> counters are not sent nor does Cnt require option to be always sent which
> I forgot to explicitly state.

[BB] If we're going to have this new byte, there is no justification for 
saying "Cnt needs to not be sent if byte
counters are not sent".

Certainly the reason counters are not sent might be lack of space for 6B 
or 9B, in which case there might not be space for 3B option either. But 
if there is space for 3B, including just the Cnt field helps a lot.

>
> I just tried to also collect my thoughts about the cases where only Cnt
> appear but not byte counters although that was not the main idea (just to
> "fully spec it"). But while writing them down I realized that in (nearly)
> ACK lossless environments the Cnt alone could indicate the IP-ECN edges
> which probably affected the text too much and just created more confusion.

[BB] The point is, if you have a counter in an option, you don't need to 
guess what that counter is (because it's there!). Cnt is only to give 
the algo knowledge of which counter will update in future, in case the 
Data Sender gets future ACKs without an AccECN option, or possibly with 
an AccECN option, but with only one{Note 1} counter.

{Note 1}: Strictly, I should say "with only N counters, where N is less 
than the number of counters that have changed at some point during the 
connection".


>
>>> If an AccECN option without bytes
>>> counters is increased but Cnt value is included and changed, the sender
>>> switches to the indicated counter (but cannot sync counters which may be
>>> be somewhat off in case of ACK losses).
>> This last sentence is the most important part that you hadn't stated before.
>>    (I assume there's a typo: s/increased/included/.)
> Yes, although I'd say "received" now that you note it.
>
>> But you haven't said whether it's MUST or SHOULD (except the previous
>> sentence says that it MAY be left out).
>> It cannot be a MUST (in case there isn't any option space on a
>> particular packet).
>> If we were to go in this direction, this sentence surely ought be a
>> "SHOULD" with the same strength as the "SHOULD" for Change-Triggered ACKs.
> Yes, the intention was to say that Cnt MUST be included to ACKs that have
> any byte counters. And therefore "SHOULD" be included to change-triggered
> ACKs.
>
> The sender receiving Cnt MUST use the newest Cnt value for estimating
> which byte counter is incrementing on a subsequent ACK if it contains no
> AccECN option.

[BB] if we use this scheme, I don't think we will need to make it 
mandatory how to /use/ Cnt. The behaviour that interop depends on is the 
conditions for sending Cnt, not how it's used. That can just be "The 
sender receiving Cnt can use ..."

>
>>> If the Option is sent in a change-triggered ACK, the Cnt field will
>>> differ from the previously sent value. For other ACKs the option, Cnt is
>>> the same as previously. As a new AccECN options should be sent in
>>> the next change-triggered ACK, the IP-ECN field edges are captured.
>>>
>>> Now, even if there were any number of ACK losses prior to receiving
>>> such an AccECN option, the sender can immediately sync with the receiver's
>>> state
>> I think you only mean the receiver's state relating to which ACK counter
>> is currently changing. The state of the counters can still be wrong, due
>> to previous ACK losses.
> ...If the byte counters are not included, that may occur due to ACK
> losses, yes. The delta will be correct though.
>
> In my mind model, however, byte counters and appearance of Cnt are more
> tightly coupled than you seem to think. It is possible to see/send Cnt
> alone but that never was my intention to endorse (but as mentioned above,
> I can see some use case for Cnt to appear alone).
>
>>> and knows what counter the receiver will be increasing, no need to
>>> guess that based on any byte counter delta (on the next ACK if it
>>> doesn't contain AccECN option).
>>>
>>> The main point with Cnt is to help the sender to do more accurate
>>> estimation in the cases where ACKs without AccECN option arrive.
>>> As such estimation needs only run on ACKs, the Cnt information does
>>> not require sending extra ACKs at any point of time. In fact, the
>>> change-triggered ACKs requirement could even be relaxed with it
>>> because together the byte counters and Cnt sync the AccECN state
>>> such that knowing the exact point of the IP-ECN field edge is no
>>> longer as necessary as earlier.
>> I believe you are saying that the meaning of Cnt on an acceptable ACK is
>> twofold:
>> 1) For the past:
>>    * If the byte counter indicated by Cnt is absent from this option,
>> consider the new bytes acked by this packet to have incremented that
>> counter.
>>    * If the byte counter indicated by Cnt is present on this option
>> ??? (Does it have any other use for the past?)
>> 2) For the future:
>>    * If there is no AccECN Option on a subsequent acceptable ACK that
>> acknowledges new data, consider the new bytes acked by that packet to
>> have incremented the byte counter indicated by the last seen value of Cnt.
> I was only trying to solve case #2.

[BB] #1 is for when time reaches the point in the future that #2 
prepared for in the past.


>
>> In the presence of ACK loss:
>> * Meaning#1 is much more useful.
>> * Meaning #2 is less useful, because if ACKs are being thinned or lost,
>> the value of Cnt most recently received by the Data Sender won't
>> necessarily be the one most recently sent by the Data Receiver.
> I disagree this evaluation, #2 is the reason why I proposed this.
> The cases related to #1 are just things that are a side-product of
> not being able to fit the Cnt and byte counters always to the limited
> option space.

[BB] Yes, I know that. But that doesn't mean the side product isn't more 
useful than you first realized.

>
> If ACKs are lost, Cnt definately is not "less useful". With Cnt the
> situation is "equal or better". ACK+Option losses will obviously have an
> impact on any estimation heuristic. Cnt+byte counters, however, gets
> immediately back on track when ACK+Option gets through at some point after
> the loss, unlike the other approaches that so far have been on the table.
> I cannot see how estimates from the other approaches could be "more
> useful" than Cnt assisted approach in the ACK thinning / ACK loss cases.

[BB]
#2 (future) is vulnerable to losing an ACK in the future that might 
state a different value of Cnt.
#1 (past) is vulnerable to having lost an ACK since the last value of 
Cnt, that might have stated a different value of Cnt.

However, both together give more certainty. If Cnt is the same on two 
subsequent packets (even if there's no associated counter on the later 
one), it reduces the chance that there were ACK loss(es) in between that 
might have changed Cnt (there would have had to be >1 ACK loss that 
changed it then changed it back again.

If Cnt is different on two subsequent packets, but the new counter 
indicated by Cnt has not been shown since that last packet, at least it 
reveals that there must have been an intermediate ACK with that counter, 
that must have been lost.


>
>> Assessment:
>> * Meaning #2: To put it ironically, this scheme tries to solve the
>> problem of losing ACKs that say which counter will change in future, by
>> introducing a field on an ACK that says which counter will change in
>> future. But the ACK carrying this new field is just as likely to be lost
>> as the old way.
> Of course but when ACK with Cnt+byte counters get through, the state is
> immediately brought up to date and the sender knows how to continue on
> the next ACK if that doesn't contain AccECN option.

[BB] Surely, if counters get through, the state can immediately be 
brought up to date anyway, without needing Cnt.
So, if both (or all) counters are included, Cnt is actually only useful 
for the future (which soon becomes the past, obviously).


>
>> * Meaning #1: Then the question has to be, if Cnt is most useful on a
>> packet without the associated counter (meaning#1), then why not include
>> that counter? IOW, Cnt consumes 3B to save 5B (or sometimes to save 8B)
>> (including the overhead of the option kind and length). And note that
>> Cnt is still ambiguous, whereas including the actual counter is unambiguous.
> No, from estimation point of view (on the next ACK without AccECN option)
> Cnt is unambiguous whereas counters aren't.

[BB] Eh? There's something seriously different between our 
understandings here.
If a counter is included on ACK#1, it /unambiguously/ gives the state now.

If Cnt is included on ACK#1 it /ambiguously/ gives what the state will 
be when a future ACK (#2) without AccECN options appears. That's 
ambiguous, because you cannot know whether an ACK or ACKs with a 
different Cnt value was lost between #1 & #2.

if Cnt is included on ACK#2 (even if counters are not), it significantly 
reduces that ambiguity, because you can compare it with the Cnt on Ack#1 
(as explained two responses ago).



> If you bring ACK losses
> again on the table here, then you should explain how the other estimation
> approach would outperform because I cannot see how they could less
> ambiguous (other than by chance).

[BB] See previous answer.

(Also, that first sentence is odd? If ACK losses were not on the table, 
we wouldn't need to be talking about Cnt. It is only there to deal with 
ACK losses.)

> But I guess your comment mainly stemmed
> from misconcept that I was proposing to send Cnt w/o byte counters.

[BB] I know you didn't intend it. It's not a misconcept just because you 
didn't.
I'm saying it's much more powerful if Cnt can always be included, even 
when there are no counters.

>
>> I guess the idea of Cnt arose from reading all the SHOULDs about when to
>> send an AccECN Option as if they might not be adhered to. So this
>> additional 1B field is really only solving a problem where there is not
>> space for 5B or 8B, but there is space for 3B.
> No. The idea of Cnt came from the requirement to include AccECN not only
> on Change-Triggered ACKs but the next ACK too to more robustly communicate
> which counter is increasing. You were somewhat against consuming those
> extra bytes for sending the option second time.
>
>>> If Cnt is zero, the receiver got a packet with non-ECT and no counter
>>> is increasing as a result of the ACK or subsequent ACKs until next
>>> the AccECN option arrival.
>> More precisely, I think you mean that all the new bytes ACK'd by this
>> packet were Not-ECT.
>> That's useful. Without Cnt this is only really possible by sending an
>> option with all three counters then sending one later with the counters
>> unchanged.
> Agreed, for this case it would also provide slightly more information
> than the counters alone.
>
>>> Since the byte counter indicated with Cnt field is typically increasing,
>>> it would be possible to make the Cnt value dual purpose and use it to
>>> indicate which counter appears first in the Option (if there are any
>>> counters in the first place). This would partically resolve Michael's
>>> concern about the field ordering. Other counters that have changed since
>>> the receiver sent last AccECN option should be included after the
>>> first field (in some order, specifying the order of the remaining
>>> fields is beyond this Cnt proposal).
>> As you say, we don't have to do this.
>> I'm yet to be convinced of the value of allowing the field order to
>> change on each packet, just because we want the field order to be able
>> to be changed for each connection.
> I came across recently something related to this when creating a
> packetdrill tests for shrinking the option size due to other options.
> The receiver couldn't send the AccECN option because all modified counters
> didn't fit. In the test was just "randomly" using ECT0, CE, ECT1 packets
> to create edges while SACK blocks indicated holes, alignment+TS+SACK
> blocks ate so much space that the last byte counter (ECT1 in this cases)
> no longer fit to the option so AccECN degrades to optionless mode until
> SACK blocks are no longer required (typically, that would be until
> recovery ends). Maybe not a big problem for use cases with only two ECN IP
> field values but perhaps still worth to consider if something needs to be
> done or not.

[BB] Altho just 2 counters changing is at the top of our minds, the idea 
is to be able to work well with 3-counters changing as well. For 
instance, SCE (even tho the scetcp draft doesn't use AccECN, it might). 
And there might be other 3-counter schemes in future.




Bob

>
> --
>   i.

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/


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Benjamin Kaduk has entered the following ballot position for
draft-ietf-tcpm-converters-18: No Objection

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email addresses included in the To and CC lines. (Feel free to cut this
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for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Thank you for adding the applicability statement; it removes the main sense
of having disparate deployment scenarios one of which is well-defined and the
other of which requires some under-specified actions in order to be secure.

I'm still pretty uneasy about giving such emphasis to the "0-RTT" nature
of this service, and feel that achieving the "0-RTT" nature relies on some
strong assumptions on the nature of the network in which the protocol is
being deployed, so that the 0-RTT nature is not as much an attribute of
the protocol itself as the combination of the protocol and the deployment
scenario.  That said, the document is not describing an internally inconsistent
state, so I cannot justify making this a Discuss-level point any more.




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Hi Ben

Thank you for the follow-up.=20

Please see inline.=20

Cheers,
Med

> -----Message d'origine-----
> De=A0: Benjamin Kaduk [mailto:kaduk@mit.edu]
> Envoy=E9=A0: samedi 21 mars 2020 00:15
> =C0=A0: BOUCADAIR Mohamed TGI/OLN
> Cc=A0: The IESG; draft-ietf-tcpm-converters@ietf.org; tcpm-
> chairs@ietf.org; tcpm@ietf.org; Michael Scharf
> Objet=A0: Re: Benjamin Kaduk's Discuss on draft-ietf-tcpm-converters-17:
> (with DISCUSS and COMMENT)
>=20
> Hi Med,
>=20
> Thanks for the updates in the -18, and sorry for the delayed response!
> Adding the applicability statement covers my main concerns, which
> regarded
> the disparity between [protection provided by the network in the
> first-party case] and [protection provided by TBD in the third-party
> case].
> By limiting to the first case, concerns about imposing requiremnets
> without
> guidance on how to achieve them evaporate.
>=20
> I'll start with a few comments that strike me from reading the diff
> (and
> skimming the -18), with further notes inline.
>=20
> While the applicability statement in Section 1.3 alleviates most of my
> concerns, it seems a little strange to say that the converter MUST be
> provided by the same entity as connectivity service and then go on in
> the
> next paragraph to talk about converters deployed by third parties.
> Perhaps
> it should be "any future deployment" by third parties?
>=20

[Med] I made this change: s/Deployment/Future deployment=20

> Thank you for referring to the need for an application profile for
> TLS 1.3 0-RTT data usage!

[Med] That's the minimum required :-)

>=20
> Section 2
>=20
> W.r.t. using a DNS name vs. IP address to identify the converter,

[Med] I think you meant identifying the destination server, not the convert=
er.=20

 and
> only
> allowing an IP address for the destination server, are there any
> considerations regarding "split-DNS" or private IP address that are
> worth
> mentioning?  (I didn't think of any off the top of my head, but would
> appreciate a bit more brainstorming.)

[Med] Good point about split-horizon. The client can make an informed decis=
ion about its name resolution (see for example, RFC6731). There is a risk t=
hat the name resolution at the converter does not match the one that would =
be made by the client. Worse, the resolution may fail at the converter.

I can add this note:

   Note that the name resolution at the Converter may fail (e.g., private n=
ames
   discussed in Section 2.1 of [RFC6731]) or may not match the one that
   would be returned by a Client's resolution library (e.g., Section 2.2
   of [RFC6731]).

>=20
> Section 4.1
>=20
>    A Client is configured, through means that are outside the scope of
>    this document, with the names and/or the addresses of one or more
>    Transport Converters and the TCP extensions that they support.  The
>=20
> We have some limited discovery for converter support for TCP
> extensions;
> is it 100% required to know this through out-of-band means?
>=20

[Med] Yes. The client can't use the service name ('convert') for resolution=
 unless it is configured with a domain name.=20

> Section 9.1, second paragraph, first line s/Convert/Converter/, I
> think?
>=20

[Med] Fixed. Thanks. =20

>=20
> On Thu, Mar 05, 2020 at 01:20:30PM +0000, mohamed.boucadair@orange.com
> wrote:
> > Hi Ben,
> >
> > Thank you for the detailed review. Much appreciated!
> >
> > Please see inline.
> >
> > Cheers,
> > Med
> >
> > > -----Message d'origine-----
> > > De=A0: Benjamin Kaduk via Datatracker [mailto:noreply@ietf.org]
> > > Envoy=E9=A0: jeudi 5 mars 2020 10:46
> > > =C0=A0: The IESG
> > > Cc=A0: draft-ietf-tcpm-converters@ietf.org; tcpm-chairs@ietf.org;
> > > tcpm@ietf.org; Michael Scharf; michael.scharf@hs-esslingen.de
> > > Objet=A0: Benjamin Kaduk's Discuss on draft-ietf-tcpm-converters-17:
> > > (with DISCUSS and COMMENT)
> > >
> > > Benjamin Kaduk has entered the following ballot position for
> > > draft-ietf-tcpm-converters-17: Discuss
> > >
> > > When responding, please keep the subject line intact and reply to
> all
> > > email addresses included in the To and CC lines. (Feel free to cut
> > > this
> > > introductory paragraph, however.)
> > >
> > >
> > > Please refer to https://www.ietf.org/iesg/statement/discuss-
> > > criteria.html
> > > for more information about IESG DISCUSS and COMMENT positions.
> > >
> > >
> > > The document, along with other ballot positions, can be found
> here:
> > > https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/
> > >
> > >
> > >
> > > ------------------------------------------------------------------
> ----
> > > DISCUSS:
> > > ------------------------------------------------------------------
> ----
> > >
> > > I agree with Roman, and present a somewhat different take on some
> of
> > > the
> > > key aspects of the scoping discussion.
> > >
> > > I have pretty fundamental concerns about describing this protocol
> as a
> > > "0-RTT" service when it both requires strong mutual
> > > authentication/authorization of the communicating endpoints and
> relies
> > > on the (local) network to provide those properties.  If IP in
> general
> > > provided the kind of mutual authentication assumed here, the
> internet
> > > would be a much more secure place!  Unfortunately, it does not and
> I
> > > think this document does its readers a disservice by transparently
> > > assuming that it does (in the main body of text; the security
> > > considerations do touch on the requisite details).  It would be
> better
> > > to discuss the proxy protocol separately from the deployment
> > > considerations that allow it to be used without additional set-up
> in
> > > specific deployment scenarios.
> > >
> > > And that's only when considering the client authenticating the
> server!
> > > Mutual authentication also requires the server to authenticate the
> > > client and be able to make authorization decisions based upon that
> > > authenticated identity.  The deployment model presented here seems
> to
> > > imply a very tight coupling between the Transport Converter
> operator
> > > and
> > > the network service provider (in order to determine, based on
> client
> > > IP
> > > address, the authenticated client identity and access an
> authorization
> > > database); this seems to make it incompatible with the stated
> > > possibility of using a third-party Transport Converter.
> > > Additionally, it raises some questions along the lines of
> > > draft-arkko-iab-internet-consolidation and draft-iab-for-the-
> users.
> > >
> > > The sketch of a solution for more open network environments in
> Section
> > > 9.2 is insecure (once a Cookie is generated and sent once, it can
> be
> > > freely replayed by an attacker during the Cookie lifetime, which
> > > defeats
> > > the authorization requirement of the convert protocol).  Either
> fix it
> > > or remove it entirely.
> > >
> >
> > [Med] I hope this one is resolved with the outcome of the Roman's
> DISCUSS.
>=20
> It seems to be, in the essence of it.
> I would prefer to see a note at the end of the second paragraph of
> Section
> 9.2 that mentions how an attacker able to observe traffic in the
> internal
> realm could observe the authentication cookie and reuse it to ill
> effect.

[Med] It can re-use it only if it can spoof the IP address of the owner of =
the cookie and that spoofed packet forwarded by the network.=20

I though such attack is covered by this text:

   Attacks from within the network between a Client and a Transport
   Converter are yet another actual threat. =20


> (That is, this scenario assumes that the innards of the internal realm
> network are physically secure, even if attachment by un-vetted devices
> is
> allowed.)
>=20
...
>=20
> > > Section 1.2 says that the Convert Protocol "is an application-
> layer
> > > protocol which uses a dedicated TCP port number", but the IANA
> request
> > > in Section 10.1 is for a service name without fixed port number.
> > >
> >
> > [Med] s/dedicated port number/specific port number.
> >
> > How that specific port number is known to clients is part of the
> service discovery and is as such out of scope.
>=20
> Sure.  (Would "specific port number on the given host" be better? I
> can't
> say, myself.)

[Med] I went for: "specific port number on the Converter."=20

>=20
> > >
> > > ------------------------------------------------------------------
> ----
> > > COMMENT:
> > > ------------------------------------------------------------------
> ----
> > >
> > > Section 1.1
> > >
> > >    scheme can be applied independently on clients and servers.
> Other
> > >    improvements such as Selective Acknowledgments [RFC2018] or
> large
> > >    windows [RFC7323] require a new TCP option or to change the
> > > semantics
> > >    of some fields in the TCP header.  These modifications must be
> > >    deployed on both clients and servers to be actually used on the
> > >    Internet.  Experience with the latter TCP extensions reveals
> that
> > >    their deployment can require many years.  Fukuda reports in
> > >
> > > Do we want to say "the latter" or "the latter class of"?
> >
> > [Med] Not sure what "class of" TCP option would mean here.
>=20
> It would be "class of TCP extension", I think -- ones that require a
> new
> TCP option or to change the semantics of a header field (i.e., not
> ones
> that can be applied independently on clients and servers).
>=20

[Med] Aah. OK. =20

> > >
> > >    Timestamps.  [ANRW17] describes measurements showing that TCP
> Fast
> > >    Open (TFO) [RFC7413] is still not widely deployed.
> > >
> > > Perhaps people are turned off by its privacy properties or lack
> > > confidence that their data can tolerate replay?
> >
> > [Med] The measurements focus on the server's side. That is, the
> client presents the TFO but the negotiation fails.
>=20
> Sure.  I'm proposing potential reasons for server operators to be
> disinclined to support TFO even if they are capable of agile
> deployment
> modes for protocol features..
>=20
> >   This is not the most
> > > compelling example of a TCP feature that everyone should be
> using...
> >
> > [Med] Those willing to optimize the connection delay may be
> interested. Will add pointers for the lack of support of other TCP
> options (e.g., MPTCP).
>=20
> Thanks!
>=20
> > >
> > >    More recently, 5G bonding experimentation has been conducted
> into
> > >    global range of the incumbent 4G (LTE) connectivity using newly
> > >    devised clients and a Multipath TCP proxy.  Even if the 5G and
> the
> > > 4G
> > >    bonding relying upon Multipath TCP increases the bandwidth, it
> is
> > > as
> > >
> > > nit: the grammar is not right here; either "to increase" or
> "reliance
> > > upon", depending on the intended meaning, I think.
> >
> > [Med] Changed to:
> >
> > "Even if the 5G and the 4G bonding (that relies upon Multipath TCP)
> increases the bandwidth"
> >
> > >
> > >    mobile core.  In order to handle URLLC (Ultra Reliable Low
> Latency
> > >    Communication) for the next generation mobile network,
> Multipath
> > > TCP
> > >    and its proxy mechanism such as the one used to provide Access
> > >    Traffic Steering, Switching, and Splitting (ATSSS) must be
> > > optimized
> > >    to reduce latency [TS23501].
> > >
> > > There are a lot of missing steps of reasoning here if we want to
> claim
> > > that this is a technical fact vs. marketing material.
> >
> > [Med] This is not a claim. This is a requirement for the design of
> ATSSS: observing a delay before making use of a connection is to be
> avoided.
>=20
> Er, sorry; I was implicitly tying in to the secdir review thread where
> it
> was asserted (hence, my use of "claim") that the content in the first
> 20
> pages were technical facts.  The connections between URLLC needing
> MPTCP
> and proxy mechanisms, and the connection between URLCC and the need
> for
> optimization to reduce latency, are not clearly made just from this
> text.
> (Perhaps [TS23501] does; I didn't get a chance to read it.)
>=20
> > >
> > > Section 1.2
> > >
> > >    The Convert Protocol provides 0-RTT (Zero Round-Trip Time)
> > > conversion
> > >    service since no extra delay is induced by the protocol
> compared to
> > >    connections that are not proxied.  Particularly, the Convert
> > > Protocol
> > >    does not require extra signaling setup delays before making use
> of
> > >    the conversion service.  The Convert Protocol does not require
> any
> > >
> > > In tightly controlled network environments where MAC can be
> assumed to
> > > provide sufficient authentication, authorization, and access-
> control
> > > functionality to meet the security needs of the proxy protocol;
> >
> > [Med] Which is the deployment model of this spec. I hope this is now
> more clear with the new "Applicability scope" discussed with Roman.
> >
> >  this
> > > cannot hold when additional mutual authentication schemes are
> > > required,
> > > as envisioned in Section 9.2
> >
> > [Med] I'm not sure about this because this is out of scope of this
> version.
> >
> > If TLS1.3 is used for example, a connection may be established at
> bootstrap with the Transport Converter, and then use 0-RTT early data
> when the user want to solicit the converter. A more serious analysis
> should be done to assess if the use of early data is safe but that is
> for future work.
>=20
> I am pretty sure that TLS 1.3 0-RTT is not going to be safe for the
> general
> case of things one might want to use TCP Convert for.
>=20
> >
> > >
> > >    The Transport Converter adheres to the main principles drawn in
> > >    [RFC1919].
> >
> > [Med] s/principles drawn in /steps drawn in Section 3 of.
> >
> >  In particular, a Transport Converter achieves the
> > >
> > > Er, which principles are those?  RFC 1919 is a 35-page document
> > > entitiled "Classical versus Transparent IP proxies" that facially
> > > seems
> > > to be a  comparison and not a declaration of guiding principles.
> > >
> > >    The main advantage of network-assisted conversion services is
> that
> > >    they enable new TCP extensions to be used on a subset of the
> path
> > >    between endpoints, which encourages the deployment of these
> > >
> > > If those are the extensions that the conversion-service provider
> is
> > > interested in.  Are other extensions blocked due to inactivity on
> the
> > > part of the provider?
> >
> > [Med] A host can always bypass the converter so blocking an option
> at the converter does not prevent a host to make use of that option is
> supported by the server.
> >
> > >
> > > Section 2
> > >
> > >    destination.  In today's Internet, latency is a important
> metric
> > > and
> > >    various protocols have ben tuned to reduce their latency
> > >
> > > nit: s/ben/been/  "Please don't tune me!"
> > >
> >
> > [Med] :-) Fixed.
> >
> >
> > > Section 4.1
> > >
> > >    A connection can be initiated from both sides of the Transport
> > >    Converter (Internet-facing interface, customer-facing
> interface).
> > >
> > > How does the internet-facing-initiated case work?  Does the client
> > > have
> > > to register?
> >
> > [Med] The client has to create a state using PCP (RFC6887) for
> example that it communicates to the remote peer. Once a SYN matching
> that state is received by the converter, the converter will use
> Convert to assist the connection.  These details are discussed in
> Section 5.2.
> >
> > >
> > >    Transport Converters can be operated by network operators or
> third
> > >    parties.  Nevertheless, this document focuses on the single
> > >
> > > I'm not convinced that the present document actually describes how
> to
> > > use a third-party-run transport converter in a secure fashion.
> >
> > [Med] This text is now removed. Please refer to the discussion with
> Roman.
> >
> > >
> > >    A Client is configured, through means that are outside the
> scope of
> > >    this document, with the names and/or the addresses of one or
> more
> > >    Transport Converters and the TCP extensions that they support.
> The
> > >
> > > Using names rather than addresses adds a "secure DNS" requirement
> to
> > > the
> > > existing assumptions of local-network security.
> >
> > [Med] Sure, but service discovery is out of scope.
> >
> > >
> > >    connections.  This encourages the deployment of new TCP
> extensions
> > >    until they are widely supported by servers, in particular.
> > >
> > > This document has not yet shown me much to indicate that
> transparent
> > > converter implementors are more incentivized to implement new TCP
> > > extensions than third-party server operators are.
> >
> > [Med] The protocol is adopted by 3GPP for their ATSSS function, for
> example.
> >
> > >
> > >    Similar to SOCKS, the architecture does not interfere with end-
> to-
> > > end
> > >    TLS connections [RFC8446] between the Client and the Server
> > >    (Figure 3).  In other words, end-to-end TLS is supported in the
> > >
> > > Why is TLS specifically noteworthy?  Does this not apply to all
> > > higher-level protocols?
> >
> > [Med] We discuss in the security section that TLS can also be used
> between the client and the converter.
> >
> > >
> > >    It is out of scope of this document to elaborate on specific
> > >    considerations related to the use of TLS in the Client-
> Converter
> > >    connection leg to exchange Convert messages (in addition to the
> > > end-
> > >    to-end TLS connection).
> > >
> > > Because that can't be done in 0-RTT in the general case?
> >
> > [Med] It can with 0-RTT early data with TLS1.3, but that require
> more analysis.
> >
> > >
> > > Section 4.2
> > >
> > >    Server, without experiencing an extra delay.  The Transport
> > > Converter
> > >    waits until the receipt of the confirmation that the Server
> agrees
> > > to
> > >    establish the connection before confirming it to the Client.
> > >
> > > nit: I suggest clarifying the antecedent of "it".
> > >
> > >    that SYN.  The Transport Converter receives this SYN because it
> is,
> > >    for example, on the path between the remote host and the Client
> or
> > > it
> > >    provides address sharing service for the Client.  If the check
> > > fails,
> > >
> > > Is there a reference for "address sharing service"?
> >
> > [Med] rfc6269#section-2. I added a pointer.
>=20
> Thanks!
>=20
> > >
> > >    As discussed in [RFC7413], such change to TCP semantic raises
> two
> > >    issues.  First, duplicate SYNs can cause problems for some
> > >    applications that rely on TCP.  Second, TCP suffers from SYN
> > > flooding
> > >
> > > Is it really best to say "some applications" when the onus to
> prove
> > > replay-safety on a per-protocol basis leads to a need to assume as
> a
> > > baseline that all protocols are not compatible with TFO until
> proven
> > > otherwise?
> > >
> >
> > [Med] "some applications" was used in reference to this part of
> RFC7413:
> >
> >   "on to accept old SYN packets with data, i.e., to restrict TFO use
> to
> >    a class of applications (Section 6) that are tolerant of
> duplicate
> >    SYN packets with data."
> >
> > Is there a particular change that you would like to be implemented?
> Thanks.
>=20
> I'd consider "duplicate SYNs can cause problems for applications that
> rely
> on TCP; whether or not a given application is affected dependes on the
> details of that application protocol".  Maybe it's too wordy, though.

[Med] OK, thanks.

>=20
> > >    terminate the downstream connection by using FIN packets.  If
> the
> > >    downstream connection terminates with the exchange of FIN
> packets,
> > >
> > > Why do we have "RST segment" in the previous paragraph but "FIN
> > > packet"
> > > here?
> >
> > [Med] Because this one is about the behavior for terminating
> connection with FIN. Is there any issue?
>=20
> I was just commenting on "segment" vs. "packet" -- e.g., RFC 793
> refers to
> "FIN segments" but not "FIN packets".

[Med] OK, thanks. Fixed.=20

>=20
> > >
> > > Section 4.3
> > >
> > >         * Lifetime is the validity lifetime of the entry as
> assigned
> > >           by the Converter.
> > >
> > > Conceptually a lifetime is a "time to survive relative to a given
> > > reference time".  If the reference time is "now", this lifetime
> would
> > > need to be continuously updated; if not, don't we need to also
> store
> > > the
> > > reference time?  (Alternately, just store the expiration time and
> not
> > > the lifetime.)
> >
> > [Med] I updated the text as follows:
> >
> >      * Lifetime is a timer that tracks the remaining lifetime of
> >        the entry as assigned by the Converter. When the timer
> >        expires, the entry is deleted.
> >
> > How this is tracked is implementation-specific.
>=20
> Indeed.  Thanks for the update.
>=20
> > >
> > > Section 5.1
> > >
> > > Do we want to say anything about (end-to-end?) MPTCP operation
> with
> > > the
> > > Transport Converter in the middle?  Does it need to do anything
> other
> > > than just pass packets (and maybe swap out addresses)?
> > >
> >
> > [Med] IMO, we don't have much to say here.
>=20
> Okay.  (This is not my area of expertise...)
>=20
> >
> > > Section 5.2
> > >
> > >    address, external port number).  The external IP address and
> > > external
> > >    port number will be then advertised using an out-of-band
> mechanism
> > > so
> > >    that remote hosts can initiate TCP connections to the Client
> via
> > > the
> > >    Converter.  Note that the external and internal information may
> be
> > >
> > > Advertised by the Transport Converter or the Client?
> >
> > [Med] s/then advertised using/then advertised by the client (or the
> user) using
> >
> >  (We leave it
> > > implicit that the allocated external address/port will be
> communicated
> > > back to the client by PCP.)
> >
> > [Med] I added this NEW sentence:
> >
> > The external IP address, external port number, and assigned lifetime
> are returned back the Client in the PCP response.
> >
> > >
> > >    is found, the Converter silently ignores the message.  If an
> entry
> > > is
> > >    found, the Converter inserts an MP_CAPABLE option and Connect
> TLV
> > > in
> > >    the SYN packet, rewrites the source IP address to one of its IP
> > >    addresses and, eventually, the destination IP address and port
> > > number
> > >    in accordance with the information stored in the mapping.
> SYN+ACK
> > >
> > > Why "eventually"?
> >
> > [Med] because the converter may operate in an address preservation
> mode. In such case, the same address will be used.
> >
> > >
> > >    It is out of scope of this document to define specific Convert
> TLVs
> > >    to manage incoming connections.  These TLVs can be defined in a
> > >    separate document.
> > >
> > > It seems a little bit of a bait-and-switch to do so, given that
> the
> > > discussion of the example in Figure 6 explicitly says "the
> Tranport
> > > Convert [sic] inserts a TLV message that indicates the source
> address
> > > and port number of the remote host".
> > >
> >
> > [Med] The discussion related to Figure 6 is correct. This note is
> about defining Convert TLVs to accommodate deployment where PCP is not
> supported. These TLVs (if defined) will basically mimic PCP requests.
>=20
> Ah, I see what is meant, now.
>=20
> > > Section 6
> > >
> > >    Convert messages may appear only in a SYN, SYN+ACK, or in an
> ACK
> > > that
> > >    is sent shortly after the SYN+ACK.
> > >
> > > Can we be more precise about "shortly after the SYN+ACK" (e.g.,
> > > "acknowledging the SYN")?
> >
> > [Med] Will think about this one more.
>=20
> It looks like we just dropped the "that is sent shortly after the
> SYN+ACK"
> entirely.

[Med] This is a side effect of the new text added for handling ICMP hard er=
rors. Such errors may be received any time during a connection.

  IIUC, ACK recurs throughout the lifetime of the connection,
> so
> this would be allowing convert messages to be a recurring event.
> Or do I misunderstand the TCP terminology relating to the three-way
> handshake vs. "normal operation"?
> Would it be accurate to say "the ACK of the three-way handshake"?
>=20
> > >
...
...
> >
> > [Med] Ben, which part of this text is confusing:
> >
> >    Upon reception of an Extended Connect TLV, a Transport Converter
> >    first checks whether it supports the TCP Options listed in the
> 'TCP
> >    Options' field.  If not, it returns an error message (Section
> 6.2.8).
> >    If the above check succeeded and absent any rate limit policy or
> >    resource exhaustion conditions, a Transport Converter MUST
> attempt to
> >    establish a connection to the address and port that it contains.
> It
> >    MUST include in the SYN that it sends to the Server the options
> >    listed in the 'TCP Options' sub-field and the TCP options that it
> >    would have used according to its local policies.  For the TCP
> options
> >    that are included in the TCP Options field without an optional
> value,
> >    the Transport Converter MUST generate its own value.  For the TCP
> >    options that are included in the 'TCP Options' field with an
> optional
> >    value, it MUST copy the entire option in the SYN sent to the
> remote
> >    server.  This procedure is designed with TFO in mind.
> Particularly,
> >    this procedure allows to successfully exchange a TFO Cookie
> between
> >    the client and the server.
>=20
> This part is clear; I'm not sure I understand how it interacts with
> behaviors described elsewhere.  Perhaps I glossed over too quickly the
> difference between Base Connect and Extended Connect -- IIUC, in the
> former, the converter uses its own built-in ("default") list of
> options for
> the upstream connection.  For the Extended Connect case, though, is
> the=09
> converter intended to *only* use the options provided by the client
> (i.e.,
> so the client can implicitly direct the convert to *not* use a given
> option)?  I was assuming that "and the TCP options that it would have
> used
> according to its local policies" meant basically the same list of
> options
> that it would use for a Base Connect operation.  If those are also
> "the
> options that it advertises in the Supported TCP Extensions TLV" (per
> the
> previous paragraph), then I am having trouble coming up with a
> scenario in
> which the "MUST include in the SYN [...] the options listed in the
> 'TCP
> Options' sub-field" could require the converter to include an option
> that
> would not have been included even in the absence of that requirement
> (that
> is, by virtue of being in the converter's default list).
>=20
> There are a number of places in the above where I could be making a
> bad
> assumption; hopefully my explanation is clear enough to locate where
> that's
> happening.
>=20

[Med] Thank you Ben for catching this. The extended behavior allows a clien=
t to control the options that will be advertised by the converter. These op=
tions are supported by the converter, but aren't necessarily part of the de=
fault list. For example, the server does not negotiate TFO if this is not r=
equested by the client. =20

Deleted this sentence:=20

"These are the options that it advertises in the
   Supported TCP Extensions TLV."


> >
> >   The way it's currently worded,
> > > the extended connect TLV seems only useful for specifying precise
> > > values
> > > for options that take a value, but not for adding entirely new
> > > options.
> >
> > [Med] Yes. Options that aren't supported by the converter will be
> rejected with "unsupported option" error.
> >
> > >
> > > Section 6.2.6
> > >
> > >    by the Server in the SYN+ACK packet.  A Transport Converter
> MUST
> > >    return this TLV if the Client sent an Extended Connect TLV and
> the
> > >    connection was accepted by the server.
> > >
> > > Is the converter allowed to return this option if a basic connect
> was
> > > used?  Should the converter always attempt to return this option?
> >
> > [Med] No, this is only for TCP option are negotiated end-to-end
> (e.g., TFO).
>=20
> Is there any value in saying "MUST NOT return this TLV if the client
> sent a
> Base Connect TLV"?
>=20

[Med] The TLV can be used by the Converter even for Base Connect to let kno=
w the client, e.g., that the server is MPTCP-capable.=20

> > >
> > > Section 6.2.7
> > >
> > >    the Client.  This Cookie can be configured on the Client by
> means
> > >    that are outside of this document or provided by the Transport
> > >    Converter as follows.
> > >
> > > [But not as immediately follows; there's other content in
> between.]
> >
> > [Med] deleted "as follows".
> >
> > >
> > > Section 6.2.8
> > >
> > >    An Error TLV can be included in the SYN+ACK or an ACK sent
> shortly
> > >    after the SYN+ACK.
> > >
> > > [same comment about "shortly after"]
> > >
> > >       encoded in 8 bits.  The list of supported versions should be
> > >       padded with zeros to end on a 32 bits boundary.
> > >
> > > "should be"?  It's a protocol violation to not do something to
> make it
> > > end on a 32-bit boundary, and putting anything other than zero is
> > > liable
> > > to cause the peer to make bad assumptions, so this seems pretty
> > > mandatory to me.
> >
> > [Med] Good catch. s/should/MUST.
> >
> > >
> > >       Upon receipt of this error code, the remote peer (e.g.,
> Client)
> > >       checks whether it supports one of the versions returned by
> the
> > >       peer.  The highest common supported version MUST be used by
> the
> > >       remote peer in subsequent exchanges with the peer.
> > >
> > > There doesn't seem to be any protection against version downgrade
> > > (e.g.,
> > > by MITM) in this exchange.
> >
> > [Med] Agree. I added this NEW text in the security section:
> >
> >    Attacks from within the network between a Client and a Transport
> >    Converter are yet another actual threat.  Means to ensure that
> >    illegitimate nodes cannot connect to a network should be
> implemented.
> >
> > Should we say more?
>=20
> Maybe "Attacks from within the network between a Client and a
> Transport
> Converter (including attacks that change the protocol version) are yet
> another threat"?  I don't feel strongly about the incremental
> addition;
> your text in the -18 covers the main aspect of it.
>=20

[Med] Fixed.=20

> > >
> > >       To ease troubleshooting, the value field MUST echo the
> received
> > >       message shifted by one byte to keep to original alignment of
> the
> > >       message.
> > >
> > > I'm not sure what's meant by this "shifted" language is going to
> be
> > > clear to all readers.  (Occurs multiple times.)
> >
> > [Med] All error message share the same format:
> >
> >                       1                   2                   3
> >   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> >  +---------------+---------------+----------------+--------------+
> >  |     Type=3D0x1E |     Length    |    Error Code  |  Value       |
> >  +---------------+---------------+----------------+--------------+
> >  | value...
> >
> > Instead of starting echoing the message right after the "Error
> Code", we set the next byte to 0s and then insert the message:
> >
> >                       1                   2                   3
> >   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> >  +---------------+---------------+----------------+--------------+
> >  |     Type=3D0x1E |     Length    |    Error Code  |  zeros       |
> >  +---------------+---------------+----------------+--------------+
> >  | Echo'ed message
> >
> >
> >
> > >
> > >    o  Not Authorized (32): This error code indicates that the
> > > Transport
> > >       Converter refused to create a connection because of a lack
> of
> > >       authorization (e.g., administratively prohibited,
> authorization
> > >       failure, invalid Cookie TLV, etc.).  The Value field MUST be
> set
> > >
> > > invalid or missing, IIUC.
> >
> > [Med] if the cookie is missing, we send "Missing Cookie (3)".
>=20
> Ah, my mistake.
>=20
> -Ben
>=20


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From: Roman Danyliw 
To: "mohamed.boucadair@orange.com" , The IESG 
CC: "draft-ietf-tcpm-converters@ietf.org" , "tcpm@ietf.org" , Michael Scharf , "tcpm-chairs@ietf.org" 
Thread-Topic: Roman Danyliw's Discuss on draft-ietf-tcpm-converters-17: (with DISCUSS and COMMENT)
Thread-Index: AQHV8qpHae/q539owEKQwyg7WiYShKg57yEAgBnxo6A=
Date: Sun, 22 Mar 2020 00:45:21 +0000
Message-ID: <359EC4B99E040048A7131E0F4E113AFC0216FBA109@marchand>
References: <158338411222.29467.10310159759460758574@ietfa.amsl.com> <787AE7BB302AE849A7480A190F8B93303145F286@OPEXCAUBMA2.corporate.adroot.infra.ftgroup>
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Subject: Re: [tcpm] Roman Danyliw's Discuss on draft-ietf-tcpm-converters-17: (with DISCUSS and COMMENT)
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From nobody Sun Mar 22 02:11:14 2020
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF.

        Title           : 0-RTT TCP Convert Protocol
        Authors         : Olivier Bonaventure
                          Mohamed Boucadair
                          Sri Gundavelli
                          SungHoon Seo
                          Benjamin Hesmans
	Filename        : draft-ietf-tcpm-converters-19.txt
	Pages           : 52
	Date            : 2020-03-22

Abstract:
   This document specifies an application proxy, called Transport
   Converter, to assist the deployment of TCP extensions such as
   Multipath TCP.  A Transport Converter may provide conversion service
   for one or more TCP extensions.  The conversion service is provided
   by means of the TCP Convert Protocol (Convert).

   This protocol provides 0-RTT (Zero Round-Trip Time) conversion
   service since no extra delay is induced by the protocol compared to
   connections that are not proxied.  Also, the Convert Protocol does
   not require any encapsulation (no tunnels, whatsoever).

   This specification assumes an explicit model, where the Transport
   Converter is explicitly configured on hosts.  As a sample
   applicability use case, this document specifies how the Convert
   Protocol applies for Multipath TCP.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-tcpm-converters-19
https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-converters-19

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-converters-19


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/



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From: Jana Iyengar 
Date: Sun, 22 Mar 2020 12:00:34 -0700
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Cc: Mark Allman 
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Subject: [tcpm] Review of draft-ietf-tcpm-rto-consider-10
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--000000000000c9ff7705a1762228
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Hello all,

I've read through draft-ietf-tcpm-rto-consider-10
. It is a
useful document, and I would like to see this published. I believe it is
ready for WGLC as it is, and I would strongly support starting the process
as soon as possible.

- jana

PSA: Stay safe, stay isolated, and support your community. Support your
health care workers in whatever way you can -- they need it.

--000000000000c9ff7705a1762228
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hello all,

I've read thr=
ough=C2=A0draft-ietf-tcpm-rto-consider-10. It is a useful document, and I =
would like to see this published. I believe it is ready for WGLC as it is, =
and I would strongly support starting the process as soon as possible.
<=
/div>

- jana

PSA: Stay saf=
e, stay isolated, and support your community. Support your health care work=
ers in whatever way you can -- they need it.


--000000000000c9ff7705a1762228--


From nobody Tue Mar 24 06:52:34 2020
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Subject: [tcpm] Document Action: '0-RTT TCP Convert Protocol' to Experimental RFC (draft-ietf-tcpm-converters-19.txt)
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The IESG has approved the following document:
- '0-RTT TCP Convert Protocol'
  (draft-ietf-tcpm-converters-19.txt) as Experimental RFC

This document is the product of the TCP Maintenance and Minor Extensions
Working Group.

The IESG contact persons are Mirja Kühlewind and Magnus Westerlund.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-converters/





Technical Summary

This document specifies an application proxy, called Transport Converter, to assist the deployment of TCP extensions such as Multipath TCP. This proxy is designed to avoid inducing extra delay when involved in a network-assisted connection (that is, 0-RTT). This specification assumes an explicit model, where the proxy is explicitly configured on hosts. The proxy can be installed in managed networks by a network operator, for instance to help the deployment of Multipath TCP.

Working Group Summary

While Multipath TCP is an important use case, the Convert Protocol can actually be used for several TCP extensions. As the protocol is highly related to TCP standards and not specific to Multipath TCP, it was decided to home this document in the TCPM working group. The TCPM working group requests publication as Experimental document because the protocol targets controlled environments in which all network attachments are managed by the same administrative entity.

Document Quality

The document has been presented and discussed repeatedly in TCPM and as a result the protocol has changed several times. One frequently discussed design choice is whether and how to use TCP Fast Open (TFO). Appendix C explains the rationale for the final solution. There have also been some discussions whether such a proxy is really useful and needed. Some few contributors to the working group were not convinced by the MPTCP use case. During WGLC, Philip Eardley (chair of the MPTCP WG) has performed a comprehensive review, which was subsequently addressed in a number of document updates. The shepherd has reviewed the document before WGLC and verified that all WGLC comments are addressed. In addition to that, several contributors from vendors and network operators have explicitly expressed their support before and during WGLC. It has also been mentioned that the protocol is of interest to 3GPP. In TCPM, there is very strong but not unanimous support for publication as experimental document.

There is at least one known implementation: Tessares has an open-sourced a library (https://github.com/Tessares/libconvert) and a closed-source Hybrid Access Gateway (HAG) that uses this library directly to act as an MPTCP Converter. Korea Telekom (KT) has reported to TCPM the results of a PoC using these implementations (see https://tessares.pr.co/181810-kt-tessares-successfully-test-5g-low-latency-multi-radio-access-technology-in-a-commercial-5g-network). Other vendors have also expressed interest, but there is no publicly known second implementation.

Personnel

The document shepherd is Michael Scharf. The responsible Area Director is Mirja Kuehlewind.



From nobody Tue Mar 24 06:53:41 2020
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Subject: [tcpm] I-D Action: draft-ietf-tcpm-rfc793bis-16.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF.

        Title           : Transmission Control Protocol Specification
        Author          : Wesley M. Eddy
	Filename        : draft-ietf-tcpm-rfc793bis-16.txt
	Pages           : 106
	Date            : 2020-03-24

Abstract:
   This document specifies the Internet's Transmission Control Protocol
   (TCP).  TCP is an important transport layer protocol in the Internet
   stack, and has continuously evolved over decades of use and growth of
   the Internet.  Over this time, a number of changes have been made to
   TCP as it was specified in RFC 793, though these have only been
   documented in a piecemeal fashion.  This document collects and brings
   those changes together with the protocol specification from RFC 793.
   This document obsoletes RFC 793, as well as 879, 2873, 6093, 6429,
   6528, and 6691 that updated parts of RFC 793.  It updates RFC 1122,
   and should be considered as a replacement for the portions of that
   document dealing with TCP requirements.  It updates RFC 5961 due to a
   small clarification in reset handling while in the SYN-RECEIVED
   state.

   RFC EDITOR NOTE: If approved for publication as an RFC, this should
   be marked additionally as "STD: 7" and replace RFC 793 in that role.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc793bis/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-tcpm-rfc793bis-16
https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rfc793bis-16

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rfc793bis-16


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/



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To: tcpm@ietf.org
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From: Wesley Eddy 
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Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-rfc793bis-16.txt
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In this update, I think everything is addressed except for 4 topics:

1) Reserved bits description - I made no changes yet.  Discussion 
spanned a few threads, but didn't look to me like it converged. 
Michael's summary thread covers a number of options and relevant 
questions: 
https://mailarchive.ietf.org/arch/msg/tcpm/UOHo4tXQPpBV90U-pRmdt_LfjRA/

2) R1 and R2 values - Gorry questioned whether (A) applications should 
still be notified with R1 is reached, and (B) whether R1 = 3 RTOs and R2 
 >= 100s are still recommended values.  I don't think any other RFC or 
errata has revised these, so am inclined to leave it alone for now in 
this doc, but maybe bookmark it as a topic for future consideration in 
the working group.

3) Dead gateway detection - I made no changes yet; this may be another 
topic for potential future consideration.  The question is posed here: 
https://mailarchive.ietf.org/arch/msg/tcpm/IGhHYUOCwES7I-DjsgHnFsa-zVY/

4) OPEN+LISTEN while same local port is in SYN-SENT/RECEIVED - I made no 
changes yet, but Gorry suggested that the text below may need updating 
with regard to modern systems (I'll be grateful for specific suggested 
changes on this):

A TCP that supports multiple concurrent users MUST provide an
OPEN call that will functionally allow an application to LISTEN
on a port while a connection block with the same local port is
in SYN-SENT or SYN-RECEIVED state (MUST-42).


On 3/24/2020 9:53 AM, internet-drafts@ietf.org wrote:
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF.
>
>          Title           : Transmission Control Protocol Specification
>          Author          : Wesley M. Eddy
> 	Filename        : draft-ietf-tcpm-rfc793bis-16.txt
> 	Pages           : 106
> 	Date            : 2020-03-24
>
> Abstract:
>     This document specifies the Internet's Transmission Control Protocol
>     (TCP).  TCP is an important transport layer protocol in the Internet
>     stack, and has continuously evolved over decades of use and growth of
>     the Internet.  Over this time, a number of changes have been made to
>     TCP as it was specified in RFC 793, though these have only been
>     documented in a piecemeal fashion.  This document collects and brings
>     those changes together with the protocol specification from RFC 793.
>     This document obsoletes RFC 793, as well as 879, 2873, 6093, 6429,
>     6528, and 6691 that updated parts of RFC 793.  It updates RFC 1122,
>     and should be considered as a replacement for the portions of that
>     document dealing with TCP requirements.  It updates RFC 5961 due to a
>     small clarification in reset handling while in the SYN-RECEIVED
>     state.
>
>     RFC EDITOR NOTE: If approved for publication as an RFC, this should
>     be marked additionally as "STD: 7" and replace RFC 793 in that role.
>
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc793bis/
>
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-tcpm-rfc793bis-16
> https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rfc793bis-16
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rfc793bis-16
>
>
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
>
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpm

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In this update, I think everything is addressed except for 4
      topics:

    
1) Reserved bits description - I made no changes yet.  Discussion
      spanned a few threads, but didn't look to me like it converged. 
      Michael's summary thread covers a number of options and relevant
      questions:
      https://mailarchive.ietf.org/arch/msg/tcpm/UOHo4tXQPpBV90U-pRmdt_LfjRA/

    
2) R1 and R2 values - Gorry questioned whether (A) applications
      should still be notified with R1 is reached, and (B) whether R1 =
      3 RTOs and R2 >= 100s are still recommended values.  I don't
      think any other RFC or errata has revised these, so am inclined to
      leave it alone for now in this doc, but maybe bookmark it as a
      topic for future consideration in the working group.

    
3) Dead gateway detection - I made no changes yet; this may be
      another topic for potential future consideration.  The question is
      posed here:
      https://mailarchive.ietf.org/arch/msg/tcpm/IGhHYUOCwES7I-DjsgHnFsa-zVY/

    
4) OPEN+LISTEN while same local port is in SYN-SENT/RECEIVED - I
      made no changes yet, but Gorry suggested that the text below may
      need updating with regard to modern systems (I'll be grateful for
      specific suggested changes on this):

    
A TCP that supports multiple
        concurrent users MUST provide an

      OPEN call that will functionally allow
        an application to LISTEN

      on a port while a connection block
        with the same local port is

      in SYN-SENT or SYN-RECEIVED state
        (MUST-42).

      

    


    

    
On 3/24/2020 9:53 AM,
      internet-drafts@ietf.org wrote:

    

    

      
A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF.

        Title           : Transmission Control Protocol Specification
        Author          : Wesley M. Eddy
	Filename        : draft-ietf-tcpm-rfc793bis-16.txt
	Pages           : 106
	Date            : 2020-03-24

Abstract:
   This document specifies the Internet's Transmission Control Protocol
   (TCP).  TCP is an important transport layer protocol in the Internet
   stack, and has continuously evolved over decades of use and growth of
   the Internet.  Over this time, a number of changes have been made to
   TCP as it was specified in RFC 793, though these have only been
   documented in a piecemeal fashion.  This document collects and brings
   those changes together with the protocol specification from RFC 793.
   This document obsoletes RFC 793, as well as 879, 2873, 6093, 6429,
   6528, and 6691 that updated parts of RFC 793.  It updates RFC 1122,
   and should be considered as a replacement for the portions of that
   document dealing with TCP requirements.  It updates RFC 5961 due to a
   small clarification in reset handling while in the SYN-RECEIVED
   state.

   RFC EDITOR NOTE: If approved for publication as an RFC, this should
   be marked additionally as "STD: 7" and replace RFC 793 in that role.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc793bis/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-tcpm-rfc793bis-16
https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-rfc793bis-16

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rfc793bis-16


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm


    

  


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From: Joseph Touch 
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Date: Tue, 24 Mar 2020 10:01:37 -0700
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Some thoughts...

> On Mar 24, 2020, at 7:09 AM, Wesley Eddy  wrote:
>=20
> In this update, I think everything is addressed except for 4 topics:
>=20
> 1) Reserved bits description - I made no changes yet.  Discussion =
spanned a few threads, but didn't look to me like it converged.  =
Michael's summary thread covers a number of options and relevant =
questions: =
https://mailarchive.ietf.org/arch/msg/tcpm/UOHo4tXQPpBV90U-pRmdt_LfjRA =
IM=
O, need to be clear that:
- MUST be ignored by endpoints that don=E2=80=99t support their assigned =
use
- MUST be set to zero by endpoints that don=E2=80=99t support their =
assigned use
- requires standards-track doc to assign (IMO)

If we want to assign any for experiments, we would do that in a =
standards-track update to this doc, so this decision doesn=E2=80=99t box =
us in for all time =E2=80=94 but we=E2=80=99re not there yet IMO
> 2) R1 and R2 values - Gorry questioned whether (A) applications should =
still be notified with R1 is reached, and (B) whether R1 =3D 3 RTOs and =
R2 >=3D 100s are still recommended values.  I don't think any other RFC =
or errata has revised these, so am inclined to leave it alone for now in =
this doc, but maybe bookmark it as a topic for future consideration in =
the working group.
>=20
No particular comment...
> 3) Dead gateway detection - I made no changes yet; this may be another =
topic for potential future consideration.  The question is posed =
here:https://mailarchive.ietf.org/arch/msg/tcpm/IGhHYUOCwES7I-DjsgHnFsa-zV=
Y/ =
I=
 see the original question but nothing further. I don=E2=80=99t see =
anything needed beyond what=E2=80=99s in RFC1122 here. This is an =
optimization of a given TCP implementation to help IP, not the =
responsibility of TCP in any way to support. I.e., at best, this doc =
could say that =E2=80=9Csome TCP statistics may be used by other =
protocols, e.g., by IP for dead gateway detection=E2=80=9D. But not =
require it.
> 4) OPEN+LISTEN while same local port is in SYN-SENT/RECEIVED - I made =
no changes yet, but Gorry suggested that the text below may need =
updating with regard to modern systems (I'll be grateful for specific =
suggested changes on this):
>=20
> A TCP that supports multiple concurrent users MUST provide an
> OPEN call that will functionally allow an application to LISTEN
> on a port while a connection block with the same local port is
> in SYN-SENT or SYN-RECEIVED state (MUST-42).
>=20
I would change it to talk about connections rather than users, but =
otherwise retain it largely as-is:

A TCP that supports multiple concurrent connections MUST provide an
OPEN call that will functionally allow an application to LISTEN
on a port while a connection block with the same local port is
in SYN-SENT or SYN-RECEIVED state (MUST-42).

This does beg the question about whether we want to address how a LISTEN =
on wildcard affects concurrent LISTENs on more specific values or even =
OPENs. I=E2=80=99d really like to see this addressed explicitly - it=E2=80=
=99s a property of our API that seems to be underspecified (AFAICT).

IMO:
	More specific socket-pairs SHOULD be allowed in both LISTENs and =
OPENs in the presence of wildcard LISTENs.

I=E2=80=99d even favor that being a MUST, recognizing that existing =
systems may not support this.

Joe


--Apple-Mail=_37F78A1C-B55A-4947-B781-F0EF767B43CF
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

Some =
thoughts...

On Mar 24, 2020, at 7:09 AM, Wesley Eddy =
<wes@mti-systems.com> wrote:


 =20
    
 =20
  
In this update, I think everything is =
addressed except for 4
      topics:
1) Reserved bits description - I made no =
changes yet.  Discussion
      spanned a few threads, but didn't look to me like it =
converged. 
      Michael's summary thread covers a number of options and relevant
      questions:
      https://mailarchive.ietf.org/arch/msg/tcpm/UOHo4tXQPpBV90U-pRmdt_Lfj=
RA
IMO, need to be clear =
that:
- MUST be ignored by endpoints that don=E2=80=99t =
support their assigned use
- MUST be set to zero by endpoints =
that don=E2=80=99t support their assigned use
- requires =
standards-track doc to assign (IMO)

If=
 we want to assign any for experiments, we would do that in a =
standards-track update to this doc, so this decision doesn=E2=80=99t box =
us in for all time =E2=80=94 but we=E2=80=99re not there yet =
IMO
2) R1 and R2 values - Gorry questioned whether =
(A) applications
      should still be notified with R1 is reached, and (B) whether R1 =3D
      3 RTOs and R2 >=3D 100s are still recommended values.  I =
don't
      think any other RFC or errata has revised these, so am inclined to
      leave it alone for now in this doc, but maybe bookmark it as a
      topic for future consideration in the working =
group.
No particular comment...
3) Dead gateway detection - I made no changes =
yet; this may be
      another topic for potential future consideration.  The =
question is
      posed here:
      https://mailarchive.ietf.org/arch/msg/tcpm/IGhHYUOCwES7I-DjsgHnFsa-=
zVY/
I see the original question =
but nothing further. I don=E2=80=99t see anything needed beyond what=E2=80=
=99s in RFC1122 here. This is an optimization of a given TCP =
implementation to help IP, not the responsibility of TCP in any way to =
support. I.e., at best, this doc could say that =E2=80=9Csome TCP =
statistics may be used by other protocols, e.g., by IP for dead gateway =
detection=E2=80=9D. But not require it.
4) OPEN+LISTEN =
while same local port is in SYN-SENT/RECEIVED - I
      made no changes yet, but Gorry suggested that the text below may
      need updating with regard to modern systems (I'll be grateful for
      specific suggested changes on this):
A TCP that supports =
multiple
        concurrent users MUST provide an

      OPEN call that will =
functionally allow
        an application to LISTEN

      on a port while a =
connection block
        with the same local port is

      in SYN-SENT or SYN-RECEIVED =
state
        (MUST-42).
I would =
change it to talk about connections rather than users, but otherwise =
retain it largely as-is:

A TCP that supports multiple concurrent connections =
MUST provide an
OPEN call =
that will functionally allow an application to LISTEN
on a port while a =
connection block with the same local port is
in SYN-SENT or =
SYN-RECEIVED state (MUST-42).

This does beg the question about whether we want =
to address how a LISTEN on wildcard affects concurrent LISTENs on more =
specific values or even OPENs. I=E2=80=99d really like to see =
this addressed explicitly - it=E2=80=99s a property of our API =
that seems to be underspecified (AFAICT).

IMO:
	More =
specific socket-pairs SHOULD be allowed in both LISTENs and OPENs in the =
presence of wildcard LISTENs.

I=E2=80=99d even favor that being a MUST, recognizing =
that existing systems may not support this.

Joe

=

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From: "Holland, Jake" 
To: Michael Tuexen , tcpm IETF list 
CC: "draft-scharf-tcpm-yang-tcp@ietf.org" 
Thread-Topic: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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From: "Scharf, Michael" 
To: "Holland, Jake" , Michael Tuexen , tcpm IETF list 
CC: "draft-scharf-tcpm-yang-tcp@ietf.org" 
Thread-Topic: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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From: "Holland, Jake" 
To: "Scharf, Michael" , Michael Tuexen , tcpm IETF list 
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Thread-Topic: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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From: tom petch 
To: "Scharf, Michael" , "idr@ietf.org" 
CC: tcpm IETF list 
Thread-Topic: Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Archived-At: 
Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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From: Idr  on behalf of Scharf, Michael =0A=
Sent: 18 March 2020 20:12=0A=
=0A=
Hi all,=0A=
=0A=
This is a heads-up regarding the ongoing adoption call for draft-scharf-tcp=
m-yang-tcp-04 in TCPM.=0A=
=0A=
=0A=
Michael=0A=
=0A=
I note that you have also sent this to Netconf and that you import grouping=
s from the netconf-tcp draft which makes the netconf draft a Normative Refe=
rence except that this I-D does not mention that fact. =0A=
=0A=
I think this is problematic.  Progress on the netconf I-D has been slow for=
 some years and so your I-D could have to wait a while.  The solution would=
 be to progress the netconf draft but I do not know how this can be expedit=
ed.=0A=
=0A=
There are a lot of details in this I-D that I think of as admin which need =
fixing to conform to YANG Guidelines but would not see that as a bar to ado=
ption whereas dependency on netconf is more debatable IMHO.=0A=
=0A=
Tom Petch=0A=
=0A=
=0A=
You may want to pay attention. For instance, this document defines grouping=
s for TCP-AO and MD5, which are used by draft-ietf-idr-bgp-model.=0A=
=0A=
If you support work of this document in TCPM, or if you have any comments, =
please free to provide feedback on the TCPM list (tcpm@ietf.org).=0A=
=0A=
Thanks=0A=
=0A=
Michael (TCPM chair hat off)=0A=
=0A=
=0A=
Von: Michael Tuexen=0A=
Gesendet: Montag, 16. M=E4rz 2020 21:44=0A=
An: tcpm IETF list=0A=
Cc: draft-scharf-tcpm-yang-tcp@ietf.org=0A=
Betreff: Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-=
04=0A=
=0A=
Dear all,=0A=
=0A=
this mail starts a WG adoption call for=0A=
https://tools.ietf.org/html/draft-scharf-tcpm-yang-tcp-04=0A=
=0A=
So I would like to solicit feedback regarding support for or objections aga=
inst the=0A=
adoption of the document as a WG document in TCPM.=0A=
=0A=
Please provide feedback before March 31st.=0A=
=0A=
For the context and current state of the document, see the presentation sen=
t yesterday=0A=
to the mailing list by Mahesh.=0A=
=0A=
Best regards=0A=
Michael=0A=
=0A=
=0A=
=0A=


From nobody Wed Mar 25 09:40:11 2020
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From: "Scharf, Michael" 
To: tom petch , "idr@ietf.org" 
CC: tcpm IETF list 
Thread-Topic: Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Hi Tom,

> -----Original Message-----
> From: tom petch 
> Sent: Wednesday, March 25, 2020 1:53 PM
> To: Scharf, Michael ; idr@ietf.org
> Cc: tcpm IETF list 
> Subject: Re: Request for feedback on WG adoption of draft-scharf-tcpm-yan=
g-
> tcp-04
>=20
> From: Idr  on behalf of Scharf, Michael
> 
> Sent: 18 March 2020 20:12
>=20
> Hi all,
>=20
> This is a heads-up regarding the ongoing adoption call for draft-scharf-t=
cpm-
> yang-tcp-04 in TCPM.
>=20
> 
> Michael
>=20
> I note that you have also sent this to Netconf and that you import groupi=
ngs
> from the netconf-tcp draft which makes the netconf draft a Normative
> Reference except that this I-D does not mention that fact.

[I-D.ietf-netconf-tcp-client-server] is listed as first normative reference=
 in draft-scharf-tcpm-yang-tcp and that dependency is also mentioned in the=
 abstract. With the current structure of the models, it is not clear to me =
why a reference in the reverse direction would be needed.

So far, the feedback from the NETCONF chairs was that draft-ietf-netconf-tc=
p-client-server would most likely finish before a TCPM document. The work i=
n the NETCONF WG started much earlier.

> I think this is problematic.  Progress on the netconf I-D has been slow f=
or some
> years and so your I-D could have to wait a while.  The solution would be =
to
> progress the netconf draft but I do not know how this can be expedited.

That is an interesting line of thought. Actually, when I wear the hat of a =
co-chair of TCPM, I get told again and again that TCPM is too slow... We cu=
rrently try our best to speed up a bit. However, due to the complexity of T=
CP, the heterogeneity of implementations, and the scale of deployment of th=
e protocol, TCPM needs some time to process documents. This would almost ce=
rtainly also apply to a YANG model. In addition, TCPM has not dealt with YA=
NG so far, i.e., it is a new topic for the working group.

Realistically, even if we as authors try our best, the normative reference =
to the netconf I-D would only become a problem if that document does not pr=
ogress at all for a longer time.

Would you prefer a TCPM document without that normative reference? In any c=
ase, I doubt that timing should be the main motivation for that. Would ther=
e be other reasons?

> There are a lot of details in this I-D that I think of as admin which nee=
d fixing to
> conform to YANG Guidelines but would not see that as a bar to adoption
> whereas dependency on netconf is more debatable IMHO.

Indeed, many details require further work. That is well understood.

Thanks

Michael


> Tom Petch
>=20
>=20
> You may want to pay attention. For instance, this document defines groupi=
ngs
> for TCP-AO and MD5, which are used by draft-ietf-idr-bgp-model.
>=20
> If you support work of this document in TCPM, or if you have any comments=
,
> please free to provide feedback on the TCPM list (tcpm@ietf.org).
>=20
> Thanks
>=20
> Michael (TCPM chair hat off)
>=20
>=20
> Von: Michael Tuexen
> Gesendet: Montag, 16. M=E4rz 2020 21:44
> An: tcpm IETF list
> Cc: draft-scharf-tcpm-yang-tcp@ietf.org tcp@ietf.org>
> Betreff: Request for feedback on WG adoption of draft-scharf-tcpm-yang-tc=
p-04
>=20
> Dear all,
>=20
> this mail starts a WG adoption call for
> https://tools.ietf.org/html/draft-scharf-tcpm-yang-tcp-04
>=20
> So I would like to solicit feedback regarding support for or objections a=
gainst
> the
> adoption of the document as a WG document in TCPM.
>=20
> Please provide feedback before March 31st.
>=20
> For the context and current state of the document, see the presentation s=
ent
> yesterday
> to the mailing list by Mahesh.
>=20
> Best regards
> Michael
>=20
>=20


From nobody Wed Mar 25 13:23:30 2020
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From: "Scharf, Michael" 
To: Wesley Eddy , "tcpm@ietf.org" 
Thread-Topic: [tcpm] I-D Action: draft-ietf-tcpm-rfc793bis-16.txt
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Date: Wed, 25 Mar 2020 20:23:15 +0000
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From: Joseph Touch 
In-Reply-To: <6EC6417807D9754DA64F3087E2E2E03E2DA3C193@rznt8114.rznt.rzdir.fht-esslingen.de>
Date: Wed, 25 Mar 2020 14:30:39 -0700
Cc: Wes Eddy , "tcpm@ietf.org" 
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Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-rfc793bis-16.txt
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Hi, all,=20

I didn=E2=80=99t see these proposed ways forward before, so I=E2=80=99ll =
add my preferences to them in particular below.

Joe

> On Mar 25, 2020, at 1:23 PM, Scharf, Michael =
 wrote:
>=20
> Hi Wes,
> =20
> Regarding 1), I think that has been some (supportive) list discussion =
on cleaning up the IANA registry.
> =20
> To provide some data point, here is how I would answer the first two =
questions in my summary =E2=80=93 as usually as individual contributor:=20=

> =20
> =20
> Question 1: Should an IANA registry be created for bits 4, 5, and 6 =
with status "Reserved", which are missing on =
https://www.iana.org/assignments/tcp-header-flags/tcp-header-flags.xhtml? =

> =20
> =3D> Michael=E2=80=99s opinion: Yes, I think this should be done in =
793bis

+1

> Question 2: Should the IANA registry move to a sub-registry on the =
Transmission Control Protocol (TCP) Parameters page =
(https://www.iana.org/assignments/tcp-parameters/tcp-parameters.xhtml =
).
> =20
> =3D> Michael=E2=80=99s opinion: Yes, I think this should be done in =
793bis

+1
=20
> A little bit more tricky is the third question, which mostly matters =
for the entry created by RFC 8311=E2=80=A6
> =20
> Question 3: Should past (and current) use of bits be documented in the =
IANA registry, and, if so, how?
> =20
> =3D> Michael=E2=80=99s opinion: We could discuss whether to change the =
table structure (see =
https://www.iana.org/assignments/tcp-header-flags/tcp-header-flags.xhtml#t=
cp-header-flags-1 =
) to record past use, e.g., by adding another column =
and moving the statement =E2=80=9Cpreviously used by Historic [RFC3540] =
as NS (Nonce Sum)=E2=80=9D to that new column. The new column could have =
a title such as =E2=80=9CComments=E2=80=9D, =E2=80=9CPast Use=E2=80=9D, =
etc. That would be a purely editorial change, as it would just =
reorganize the table, but not change any entry. I don=E2=80=99t have a =
particularly strong opinion on that, though. Even if we decided that =
this was useful, we could also postpone that change to the first =
standards-track document that actually needs this, e.g., by reallocation =
bit 7 to a new use. Until this happens, the current table format still =
works. So my suggestion would be to do nothing unless others from the =
community strongly support a change by 793bis.

I favor the approach we use for IANA ports here.

Document official assignments officially.

Document unofficial uses vaguely - enough to say =E2=80=9Csomeone uses =
it=E2=80=9D but NOT specifically who or how. The latter ends up =
effectively endorsing squatting.

IANA does this by saying =E2=80=9Cknown unauthorized use=E2=80=9D.


Joe=

--Apple-Mail=_3FCCA5A1-E620-454F-AFC9-921B732C206B
Content-Transfer-Encoding: quoted-printable
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Hi, all, 

I =
didn=E2=80=99t see these proposed ways forward before, so I=E2=80=99ll =
add my preferences to them in particular below.

Joe

On Mar 25, 2020, at 1:23 PM, =
Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:

Hi Wes,
 
Regarding 1), I think that has been some (supportive) list =
discussion on cleaning up the IANA registry.
 
To =
provide some data point, here is how I would answer the first two =
questions in my summary =E2=80=93 as usually as individual =
contributor: 
 
 
Question 1: Should an IANA registry be created for bits 4, 5, =
and 6 with status "Reserved", which are missing on https://www.iana.org/assignments/tcp-header-flags/tcp-header-fl=
ags.xhtml?
 
=3D> Michael=E2=80=99s opinion: Yes, I think this should =
be done in 793bis

+1

Question 2: =
Should the IANA registry move to a sub-registry on the Transmission =
Control Protocol (TCP) Parameters page (https://www.iana.org/assignments/tcp-parameters/tcp-parameters.=
xhtml).
 
=3D> Michael=E2=80=99s opinion: Yes, I think this should =
be done in 793bis

+1
 
A little bit =
more tricky is the third question, which mostly matters for the entry =
created by RFC 8311=E2=80=A6
 
Question 3: Should past (and current) use of bits be =
documented in the IANA registry, and, if so, how?
 
=3D> Michael=E2=80=99s opinion: We could discuss whether =
to change the table structure (see https://www.iana.org/assignments/tcp-header-flags/tcp-header-fl=
ags.xhtml#tcp-header-flags-1) to record past use, e.g., by adding =
another column and moving the statement =E2=80=9Cpreviously used by =
Historic [RFC3540] as NS (Nonce Sum)=E2=80=9D to that new column. The =
new column could have a title such as =E2=80=9CComments=E2=80=9D, =
=E2=80=9CPast Use=E2=80=9D, etc. That would be a purely editorial =
change, as it would just reorganize the table, but not change any entry. =
I don=E2=80=99t have a particularly strong opinion on that, though. Even =
if we decided that this was useful, we could also postpone that change =
to the first standards-track document that actually needs this, e.g., by =
reallocation bit 7 to a new use. Until this happens, the current table =
format still works. So my suggestion would be to do nothing unless =
others from the community strongly support a change by =
793bis.

I favor =
the approach we use for IANA ports here.

Document official assignments =
officially.

Document unofficial uses =
vaguely - enough to say =E2=80=9Csomeone uses it=E2=80=9D but NOT =
specifically who or how. The latter ends up effectively endorsing =
squatting.

IANA does this by saying =
=E2=80=9Cknown unauthorized use=E2=80=9D.


Joe
=

--Apple-Mail=_3FCCA5A1-E620-454F-AFC9-921B732C206B--


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From: "Scharf, Michael" 
To: Joseph Touch 
CC: Wes Eddy , "tcpm@ietf.org" 
Thread-Topic: [tcpm] I-D Action: draft-ietf-tcpm-rfc793bis-16.txt
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From: Joseph Touch 
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Date: Wed, 25 Mar 2020 16:39:55 -0700
Cc: Wes Eddy , "tcpm@ietf.org" 
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References: <158505800923.11744.10324863157807137499@ietfa.amsl.com> <58154b27-7a38-1ec3-9ab3-8a1acd25f952@mti-systems.com> <6EC6417807D9754DA64F3087E2E2E03E2DA3C193@rznt8114.rznt.rzdir.fht-esslingen.de> <1A4077A6-514E-4A4C-8307-533F4471028E@strayalpha.com> <6EC6417807D9754DA64F3087E2E2E03E2DA3C467@rznt8114.rznt.rzdir.fht-esslingen.de>
To: "Scharf, Michael" 
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Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-rfc793bis-16.txt
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Hi, Michael,

Sure - this is all fine. It=E2=80=99s tricky but informal anyway.

Joe

> On Mar 25, 2020, at 3:03 PM, Scharf, Michael =
 wrote:
>=20
> Hi Joe,
> =20
> Regarding question 3): For header bits, at least as far as I know, =
there is no unauthorized use as of today. My comment was about =
authorized use.
> =20
> Bit 7 is reserved now but was officially allocated to NS before. So, =
question 3) is about whether and where to record that *official* use of =
bit 7.
> =20
> Right now, =
https://www.iana.org/assignments/tcp-header-flags/tcp-header-flags.xhtml =
=
records the past use in the table column =E2=80=9CName=E2=80=9D. That =
works as of today, but if bit 7 is reallocated, the question is whether =
and where to record a past and completed assignment. Even more tricky is =
the question how to record the use of bits allocated to RFC 3168 by =
newer RFCs, e.g., as foreseen by AccECN. All of this is about official =
IETF allocations by future RFCs.
> =20
> As I have now looked at =
https://www.iana.org/assignments/service-names-port-numbers/service-names-=
port-numbers.xhtml =
, I see that this registry has a column =
=E2=80=9CAssignment Notes=E2=80=9D. This would also be a reasonable name =
for a new column in the header flag registry. If we decided to go down =
that road, the IANA table after publication of 793bis could look like =
more or less as follows =E2=80=A6
> =20
> Bit          Name                                                      =
             Reference          Assignment Notes
> 4             Reserved                                                 =
          [793bis]
> 5             Reserved                                                 =
          [793bis]
> 6             Reserved                                                 =
          {793bis]
> 7             Reserved                                                 =
           [RFC8311]           Previously used by Historic [RFC3540] as =
NS (Nonce Sum)
> 8             CWR (Congestion Window Reduced)      [RFC3168]
> 9             ECE (ECN-Echo)                                           =
     [RFC3168]
> =20
> As I wrote, I think that change could be done by 793bis, as it is =
purely editorial, but I don=E2=80=99t have a very strong feeling whether =
this is really MUST HAVE.
> =20
> Unfortunately, it is possible that there could be future unauthorized =
use of header bits, e.g., if the IETF decided not to standardize one =
solution or several solutions that claim header bits. I agree that we =
could use then a term such as =E2=80=9Cknown unauthorized use=E2=80=9D. =
But right now I think how to deal with that problem would be outside the =
scope of 793bis.
> =20
> Michael
> =20
> =20
> =20
> =20
> From: Joseph Touch >=20
> Sent: Wednesday, March 25, 2020 10:31 PM
> To: Scharf, Michael >
> Cc: Wes Eddy >; =
tcpm@ietf.org 
> Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-rfc793bis-16.txt
> =20
> =20
> Hi, all,=20
> =20
> I didn=E2=80=99t see these proposed ways forward before, so I=E2=80=99ll=
 add my preferences to them in particular below.
> =20
> Joe
>=20
>=20
> On Mar 25, 2020, at 1:23 PM, Scharf, Michael =
> =
wrote:
> =20
> Hi Wes,
> =20
> Regarding 1), I think that has been some (supportive) list discussion =
on cleaning up the IANA registry.
> =20
> To provide some data point, here is how I would answer the first two =
questions in my summary =E2=80=93 as usually as individual contributor:=20=

> =20
> =20
> Question 1: Should an IANA registry be created for bits 4, 5, and 6 =
with status "Reserved", which are missing on =
https://www.iana.org/assignments/tcp-header-flags/tcp-header-flags.xhtml? =

> =20
> =3D> Michael=E2=80=99s opinion: Yes, I think this should be done in =
793bis
> =20
> +1
> =20
> Question 2: Should the IANA registry move to a sub-registry on the =
Transmission Control Protocol (TCP) Parameters page =
(https://www.iana.org/assignments/tcp-parameters/tcp-parameters.xhtml =
).
> =20
> =3D> Michael=E2=80=99s opinion: Yes, I think this should be done in =
793bis
> =20
> +1
> =20
> A little bit more tricky is the third question, which mostly matters =
for the entry created by RFC 8311=E2=80=A6
> =20
> Question 3: Should past (and current) use of bits be documented in the =
IANA registry, and, if so, how?
> =20
> =3D> Michael=E2=80=99s opinion: We could discuss whether to change the =
table structure (see =
https://www.iana.org/assignments/tcp-header-flags/tcp-header-flags.xhtml#t=
cp-header-flags-1 =
) to record past use, e.g., by adding another column =
and moving the statement =E2=80=9Cpreviously used by Historic [RFC3540] =
as NS (Nonce Sum)=E2=80=9D to that new column. The new column could have =
a title such as =E2=80=9CComments=E2=80=9D, =E2=80=9CPast Use=E2=80=9D, =
etc. That would be a purely editorial change, as it would just =
reorganize the table, but not change any entry. I don=E2=80=99t have a =
particularly strong opinion on that, though. Even if we decided that =
this was useful, we could also postpone that change to the first =
standards-track document that actually needs this, e.g., by reallocation =
bit 7 to a new use. Until this happens, the current table format still =
works. So my suggestion would be to do nothing unless others from the =
community strongly support a change by 793bis.
> =20
> I favor the approach we use for IANA ports here.
> =20
> Document official assignments officially.
> =20
> Document unofficial uses vaguely - enough to say =E2=80=9Csomeone uses =
it=E2=80=9D but NOT specifically who or how. The latter ends up =
effectively endorsing squatting.
> =20
> IANA does this by saying =E2=80=9Cknown unauthorized use=E2=80=9D.
> =20
> =20
> Joe


--Apple-Mail=_F8112B05-B136-4E26-BFED-F749E0EC9E3E
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

Hi, =
Michael,

Sure - this =
is all fine. It=E2=80=99s tricky but informal anyway.

Joe
On Mar =
25, 2020, at 3:03 PM, Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:

Hi Joe,
 
Regarding question 3): For header bits, at least as far as I =
know, there is no unauthorized use as of today. My comment was about =
authorized use.
 
Bit 7 is reserved now but was officially allocated to NS =
before. So, question 3) is about whether and where to record that *official* use of bit 7.
 
Right now, https://www.iana.org/assignments/tcp-header-flags/tcp-header-fl=
ags.xhtmlrecords the past use in the table column =E2=80=9CName=E2=80=9D=
. That works as of today, but if bit 7 is reallocated, the question is =
whether and where to record a past and completed assignment. Even more =
tricky is the question how to record the use of bits allocated to RFC =
3168 by newer RFCs, e.g., as foreseen by AccECN. All of this is about =
official IETF allocations by future RFCs.
 
As =
I have now looked at https://www.iana.org/assignments/service-names-port-numbers/ser=
vice-names-port-numbers.xhtml, I see that this registry has a column =
=E2=80=9CAssignment Notes=E2=80=9D. This would also be a reasonable name =
for a new column in the header flag registry. If we decided to go down =
that road, the IANA table after publication of 793bis could look like =
more or less as follows =E2=80=A6
 
Bit=
          Name    =
            &n=
bsp;           &nbs=
p;            =
            &n=
bsp;           &nbs=
p; Reference          =
Assignment Notes
4          &n=
bsp;  =
Reserved           =
            &n=
bsp;           &nbs=
p;            =
           =
[793bis]
5          &n=
bsp;  =
Reserved           =
            &n=
bsp;           &nbs=
p;            =
           =
[793bis]
6          &n=
bsp;  =
Reserved           =
            &n=
bsp;           &nbs=
p;            =
           =
{793bis]
7 =
            =
Reserved =
            &n=
bsp;           &nbs=
p;            =
      =
            &n=
bsp;   =
[RFC8311]           =
Previously used by Historic [RFC3540] as NS (Nonce Sum)
8 =
            CWR =
(Congestion Window Reduced)      [RFC3168]
9 =
            ECE =
(ECN-Echo) =
            &n=
bsp;           &nbs=
p;      =
            &n=
bsp;   [RFC3168]
 
As =
I wrote, I think that change could be done by 793bis, as it is purely =
editorial, but I don=E2=80=99t have a very strong feeling whether this =
is really MUST HAVE.
 
Unfortunately, it is possible that there could be future =
unauthorized use of header bits, e.g., if the IETF decided not to =
standardize one solution or several solutions that claim header bits. I =
agree that we could use then a term such as =E2=80=9Cknown unauthorized =
use=E2=80=9D. But right now I think how to deal with that problem would =
be outside the scope of 793bis.
 
Michael
 
 
 
 
From: Joseph Touch <touch@strayalpha.com> 
Sent: Wednesday, March 25, =
2020 10:31 PM
To: Scharf, Michael <Michael.Scharf@hs-esslingen.de>
Cc: Wes =
Eddy <wes@mti-systems.com>; tcpm@ietf.org
Subject: Re: [tcpm] I-D Action: =
draft-ietf-tcpm-rfc793bis-16.txt
 
 
Hi, =
all, 
 
I didn=E2=80=99t see these proposed ways =
forward before, so I=E2=80=99ll add my preferences to them in particular =
below.
 
Joe


On Mar 25, 2020, at 1:23 PM, Scharf, =
Michael <Michael.Scharf@hs-esslingen.de> wrote:
 
Hi Wes,
 
Regarding 1), I think =
that has been some (supportive) list discussion on cleaning up the IANA =
registry.
 
To =
provide some data point, here is how I would answer the first two =
questions in my summary =E2=80=93 as usually as individual =
contributor: 
 
 
Question 1: Should an IANA registry be created for bits 4, 5, =
and 6 with status "Reserved", which are missing on https://www.iana.org/assignments/tcp-header-flags/tcp-header-fl=
ags.xhtml?
 
=3D> Michael=E2=80=99s opinion: Yes, I think this should =
be done in 793bis
 
+1
 
Question 2: Should the IANA registry move to a sub-registry =
on the Transmission Control Protocol (TCP) Parameters page (https://www.iana.org/assignments/tcp-parameters/tcp-parameters.=
xhtml).
 
=3D> Michael=E2=80=99s opinion: Yes, I think this should =
be done in 793bis
 
+1
 
A little bit more tricky is the third question, which mostly =
matters for the entry created by RFC 8311=E2=80=A6
 
Question 3: Should past =
(and current) use of bits be documented in the IANA registry, and, if =
so, how?
 
=3D> Michael=E2=80=99s opinion: We could discuss whether =
to change the table structure (see https://www.iana.org/assignments/tcp-header-flags/tcp-header-fl=
ags.xhtml#tcp-header-flags-1) to record past use, e.g., by =
adding another column and moving the statement =E2=80=9Cpreviously used =
by Historic [RFC3540] as NS (Nonce Sum)=E2=80=9D to that new column. The =
new column could have a title such as =E2=80=9CComments=E2=80=9D, =
=E2=80=9CPast Use=E2=80=9D, etc. That would be a purely editorial =
change, as it would just reorganize the table, but not change any entry. =
I don=E2=80=99t have a particularly strong opinion on that, though. Even =
if we decided that this was useful, we could also postpone that change =
to the first standards-track document that actually needs this, e.g., by =
reallocation bit 7 to a new use. Until this happens, the current table =
format still works. So my suggestion would be to do nothing unless =
others from the community strongly support a change by =
793bis.
 
I favor the approach we use for IANA =
ports here.
 
Document official assignments =
officially.
 
Document unofficial uses vaguely - =
enough to say =E2=80=9Csomeone uses it=E2=80=9D but NOT specifically who =
or how. The latter ends up effectively endorsing squatting.
 
IANA does =
this by saying =E2=80=9Cknown unauthorized use=E2=80=9D.
 
 
Joe

=

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Dear all,

We just submitted an updated version of our draft, which is now entitled
"Sender Control of Delayed Acknowledgments in TCP: Problem Statement,
Requirements and Analysis of Potential Solutions".

In this revision (-01), most of the updates are intended to address the
comments by Bob Briscoe on -00.

Comments are welcome!

Thanks,

Carles and Jon



---------------------------- Original Message ----------------------------
Subject: New Version Notification for
draft-gomez-tcpm-delack-suppr-reqs-01.txt
From:    internet-drafts@ietf.org
Date:    Thu, March 26, 2020 2:31 pm
To:      "Carles Gomez" 
         "Jon Crowcroft" 
--------------------------------------------------------------------------


A new version of I-D, draft-gomez-tcpm-delack-suppr-reqs-01.txt
has been successfully submitted by Carles Gomez and posted to the
IETF repository.

Name:		draft-gomez-tcpm-delack-suppr-reqs
Revision:	01
Title:		Sender Control of Delayed Acknowledgments in TCP: Problem
Statement, Requirements and Analysis of Potential Solutions
Document date:	2020-03-26
Group:		Individual Submission
Pages:		13
URL:           
https://www.ietf.org/internet-drafts/draft-gomez-tcpm-delack-suppr-reqs-01.txt
Status:        
https://datatracker.ietf.org/doc/draft-gomez-tcpm-delack-suppr-reqs/
Htmlized:      
https://tools.ietf.org/html/draft-gomez-tcpm-delack-suppr-reqs-01
Htmlized:      
https://datatracker.ietf.org/doc/html/draft-gomez-tcpm-delack-suppr-reqs
Diff:          
https://www.ietf.org/rfcdiff?url2=draft-gomez-tcpm-delack-suppr-reqs-01

Abstract:
   TCP Delayed Acknowledgments (ACKs) allow reducing protocol overhead
   in many scenarios.  However, in some cases, Delayed ACKs may
   significantly degrade network and device performance in terms of link
   utilization, latency, memory usage and/or energy consumption.  This
   document presents the problem statement regarding sender control of
   Delayed ACKs in TCP.  The document discusses the scenarios and use
   cases in which sender control of Delayed ACKs offers advantages.
   Then, requirements for a potential solution are derived.  Finally, a
   number of potential solutions are discussed, based on the
   requirements, and also considering pros and cons in each case.




Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat





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Date: Thu, 26 Mar 2020 15:06:04 +0100
From: "Carles Gomez Montenegro" 
To: "Bob Briscoe" 
Cc: "tcpm IETF list" , "Jon Crowcroft" 
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Archived-At: 
Subject: [tcpm] Sender control of Delayed ACKs (was Re: More motivating scenarios for tcpm-ack-pull)
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Hi Bob,

Thanks a lot once again for all your comments!

As you may have seen, we just published a -01, with the aim to address
your comments.

Please find below our inline responses:

> Carles & Jon,
>
> Yes, if the tcpm WG was prepared to consider adopting this, I'd support
> it.
>
> A few comments:
>
> I'm not sure I would limit it to "suppression" of delayed ACKs, and I
> don't just mean it should include releasing suppression. In many
> circumstances the sender would be happy with less frequent ACKs than the
> receiver is generating. E.g. with high performance data transfers, 1/16
> would often be fine when there are hundreds of packets in flight. But,
> because the receiver can't be sure whether the sender would suffer one
> of the downsides to delaying ACKs, it maintains a conservatively low
> delayed ACK ratio.
>
> So perhaps a better scope (and title) would be "Sender control of
> Delayed ACKs in TCP"?
>
> I've added 'in TCP', because I think it's useful to make the scope
> concrete. But I think this doc could also be useful for other transport
> protocols, particularly QUIC.

Agreed!

We have updated accordingly the document (including the title and abstract).

> S3.1 & S3.2 Slow start & High bit rate environments and short data
> segments
>
>     However, use of Delayed ACKs reduces the amount
>     of ACKs received by the sender, thus reducing the rate of cwnd
>     growth, increasing transfer time and reducing throughput, when
>     compared with sending an ACK for each incoming data segment.
>
> I think ABC (appropriate byte counting) allows the sender to
> unilaterally address that concern without needing ACK Pull [RFC3465].

Thanks for the comment. Version -01 now reflects that ABC could be used to
address the concern, while also mentioning that it remains as an
experimental mechanism, not fully included in RFC 5681.

> The reference to 'more rapidly get up to speed during slow-start without
> overshoot' is a bit opaque. Rather than "describing by reference", it
> needs to describe the lack of ability to send patterns of packets (e.g.
> chirps) and be able to time the gaps between the ACKs. At minimum, the
> citation should refer to Appendix B.4, which was the mechanism proposed
> to do ACK pull at the time.

Agreed. We have added a more explicit description in -01, and we also
refer to Appendix B.4.

> S.3.4 Beyond classic ACK transmission behavior
>
> It ought to mention that many link technologies (Satellite, DOCSIS, LTE,
> WiFi, ...?) do TCP ACK thinning 'cos TCP doesn't do it itself, but it
> improves performance (when the ACK stream becomes the bottleneck for the
> forward path, because many reverse paths have pathetic bandwidth, esp.
> if a parallel upload is going on).
>
> See "ACK Scaling and Performance on AsymmetricPaths"
> https://erg.abdn.ac.uk/~downloads/ackscaling.pdf

Agreed. Added in -01. And thanks for the pointer!

> 4.2. Per-segment granularity
>
> Between per-segment and permanent, there's per-connection suppression.
> I'm not saying that would be any use, I'm just saying it doesn't have to
> be permanent.

Agreed! Added in -01.

> 4.4 Support for enabling generic ACK ratios
>
> This reminds me of a subtle additional requirement. When you move from
> ACK pull to controlling the ACK ratio, there's an important distinction
> between a sender's packet stopping the receiver delaying the ACK for
> /that/ packet (as in ACK pull), vs. setting the receiver's Delayed ACK
> policy for /that and subsequent/ packets.
>
> This raises the question, should the mechanism use soft state (repeated
> in every packet), or connection state (remembered by the receiver)?
> Which is hinted at in your section on "safe return to normal operation".x

We have added text in section 4.4, with the aim to incorporate your
comments above.

> 4.10+ Extra requirement: Who's in control?
>
> The receiver cannot be expected to control ACKs in any way the sender
> wants, which it will not always be able to honour anyway. So the
> semantics have to be of a hint, not a request or a command. Then there's
> the question of whether the receiver just does what it wants, or whether
> it ought to tell the sender it's not doing what it was asked.
>
> It might seem that the the receiver silently not doing what it's told is
> the simple case. However,  it adds complexity to anything trying to rely
> on the behaviour (e.g. the slow start examples).

We have added the new requirement, and have edited its content, based on
your input.

> A good first draft.
> Thank you.

Once again, thanks a lot for your comments!

Best regards,

Carles


> Bob


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Date: Thu, 26 Mar 2020 15:23:37 +0100
From: "Carles Gomez Montenegro" 
To: "Jonathan Morton" 
Cc: "tcpm IETF list" , "Jon Crowcroft" 
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Archived-At: 
Subject: Re: [tcpm] More motivating scenarios for tcpm-ack-pull
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Hi Jonathan,

First of all, sorry for the late reply.

Thanks a lot for your comments. Please find below our inline responses:

>> On 15 Mar, 2020, at 11:38 am, Carles Gomez Montenegro
>>  wrote:
>>
>> Thanks a lot for your detailed response, which helped shape our latest
>> draft [1] in several ways.
>>
>> While we focus on analyzing the problem space and its requirements, it
>> will be good to keep an eye on potential solutions as well, including
>> the
>> one you describe below. In particular, I found the idea of spacing AKP
>> flags (or something similar) in order to control the desired ACK ratio
>> to
>> be very interesting!
>
> I'm glad you found my comment useful.
>
> I think one of the big takeaways from draft-gomez-tcpm-delack-suppr-reqs
> is that the sender has the most information about when, and to what
> extent, Delayed Acks are helpful, but the receiver is the point at which
> they must be implemented. So some means to convey this information from
> sender to receiver is desirable.  The precise form of that is still open
> to debate.

Thanks for your conclusions and assessment.

We agree that the form to convey this information from sender to receiver
is open to debate. We hope that section 5 of our document can contribute
to the discussion!

> And there are well-known circumstances where the receiver already has to
> interrupt or suspend Delayed Ack processing - when it notices a packet
> loss, or receives an ECN mark, for example.  I assume these would not
> change materially on a transport supporting Ack Pull or similar.

In fact, there is a new subsection (4.10), suggested by Bob, that mentions
that the receiver might sometimes be unable to honour the ACK ratio or ACK
behavior desired by the sender (this relates also to your first paragraph
above). In a subsequent revision, we'll be more specific about
circumstances such as the ones you mention above.

Once again, thanks a lot for your comments!

Cheers,

Carles


>  - Jonathan Morton
>
>



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From: Lars Eggert 
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Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Hi,

On 2020-3-16, at 22:44, Michael Tuexen  wrote:
> this mail starts a WG adoption call for
> https://tools.ietf.org/html/draft-scharf-tcpm-yang-tcp-04
...
> Please provide feedback before March 31st.

I (still) don't believe this is worthwhile for the WG to take on.

My view here is very much biased by the disaster that were (are?) the =
TCP SNMP MIBs. Besides needing two attempts to get it right (RFC4022 =
followed by RFC4898), it took five years of WG time and produced work =
that AFAICT never really mattered, and quickly became stale.

I don't see any indications that a YANG model for TCP wouldn't follow =
the same course. Are there any stacks that indicated they were going to =
implement this? Who wants this?

Thanks,
Lars

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From: 
To: Lars Eggert , Michael Tuexen 
CC: "draft-scharf-tcpm-yang-tcp@ietf.org" , tcpm IETF list 
Thread-Topic: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Hi Lars,=20

Many YANG modules are already including TCP-specific components. Some of th=
ese are already cited in the draft. These components are defined outside tc=
pm, with little if not no review at all from tcpm. Re-using some of the com=
ponents defined in these documents may not be straightforward.=20

Defining here in tcpm the groupings that can be re-used by other modules is=
 more than appropriate. This is also to help developers of other modules. =
=20

Cheers,
Med

> -----Message d'origine-----
> De=A0: tcpm [mailto:tcpm-bounces@ietf.org] De la part de Lars Eggert
> Envoy=E9=A0: vendredi 27 mars 2020 13:41
> =C0=A0: Michael Tuexen
> Cc=A0: draft-scharf-tcpm-yang-tcp@ietf.org; tcpm IETF list
> Objet=A0: Re: [tcpm] Request for feedback on WG adoption of draft-
> scharf-tcpm-yang-tcp-04
>=20
> Hi,
>=20
> On 2020-3-16, at 22:44, Michael Tuexen  wrote:
> > this mail starts a WG adoption call for
> > https://tools.ietf.org/html/draft-scharf-tcpm-yang-tcp-04
> ....
> > Please provide feedback before March 31st.
>=20
> I (still) don't believe this is worthwhile for the WG to take on.
>=20
> My view here is very much biased by the disaster that were (are?) the
> TCP SNMP MIBs. Besides needing two attempts to get it right (RFC4022
> followed by RFC4898), it took five years of WG time and produced work
> that AFAICT never really mattered, and quickly became stale.
>=20
> I don't see any indications that a YANG model for TCP wouldn't follow
> the same course. Are there any stacks that indicated they were going
> to implement this? Who wants this?
>=20
> Thanks,
> Lars


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From: Lars Eggert 
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On 2020-3-27, at 15:01, mohamed.boucadair@orange.com wrote:
>=20
> Many YANG modules are already including TCP-specific components. Some =
of these are already cited in the draft. These components are defined =
outside tcpm, with little if not no review at all from tcpm. Re-using =
some of the components defined in these documents may not be =
straightforward.
>=20
> Defining here in tcpm the groupings that can be re-used by other =
modules is more than appropriate. This is also to help developers of =
other modules.

If you replace "YANG module" with "SNMP MIB" in what you wrote, you get =
exactly the argument that was made for why TSV should be doing MIBs.

Lars

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From: 
To: Lars Eggert 
CC: Michael Tuexen , "draft-scharf-tcpm-yang-tcp@ietf.org" , tcpm IETF list 
Thread-Topic: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Re-,

I think that you missed the key point from my message: Grouping and reuse o=
f modules.=20

I'm not sure how this would apply for MIBs. Can you please tell me what is =
the equivalent of "uses"/"refine" statement with MIBs?=20

Thank you.=20

Cheers,
Med

> -----Message d'origine-----
> De=A0: Lars Eggert [mailto:lars@eggert.org]
> Envoy=E9=A0: vendredi 27 mars 2020 14:06
> =C0=A0: BOUCADAIR Mohamed TGI/OLN
> Cc=A0: Michael Tuexen; draft-scharf-tcpm-yang-tcp@ietf.org; tcpm IETF
> list
> Objet=A0: Re: [tcpm] Request for feedback on WG adoption of draft-
> scharf-tcpm-yang-tcp-04
>=20
> On 2020-3-27, at 15:01, mohamed.boucadair@orange.com wrote:
> >
> > Many YANG modules are already including TCP-specific components.
> Some of these are already cited in the draft. These components are
> defined outside tcpm, with little if not no review at all from tcpm.
> Re-using some of the components defined in these documents may not be
> straightforward.
> >
> > Defining here in tcpm the groupings that can be re-used by other
> modules is more than appropriate. This is also to help developers of
> other modules.
>=20
> If you replace "YANG module" with "SNMP MIB" in what you wrote, you
> get exactly the argument that was made for why TSV should be doing
> MIBs.
>=20
> Lars


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On 2020-3-27, at 15:31, mohamed.boucadair@orange.com wrote:
> I think that you missed the key point from my message: Grouping and =
reuse of modules.

The point I was trying to make is that with MIBs, a similar argument was =
made that TCP stuff was being put into MIBs elsewhere in the IETF, and =
that TSV should therefore do a TCP MIB instead. And we did (twice), it =
took forever, and then saw little use.

Lars

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From: "Scharf, Michael" 
To: Lars Eggert , Michael Tuexen 
CC: tcpm IETF list , "draft-scharf-tcpm-yang-tcp@ietf.org" 
Thread-Topic: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Cc: Michael Tuexen , tcpm IETF list , "draft-scharf-tcpm-yang-tcp@ietf.org" 
To: "Scharf, Michael" 
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Hi,

On 2020-3-27, at 15:52, Scharf, Michael  =
wrote:
> But, wait a second: I recommend to have a look at the output of =E2=80=9E=
cat /proc/net/snmp=E2=80=9C under Linux (just tested on Debian =
Buster)=E2=80=A6
>=20
> As far as I can see, these are the object definitions from the =
TCP-MIB. If implemented on Linux, why does the TCP-MIB not matter?

/proc/net/snmp provides the scalars (a small subset of 4022), and =
obviously just in text form. Are you aware of any uses?

> However, we have learnt from that: We have explicitly decided not to =
include extended statistics in draft-scharf-tcpm-yang-tcp. The draft =
currently only includes basic stats.

Well, basic stats and AO detail. (And why still MD5? We obsoleted 2385 =
ten years ago.)

> It is well understood that there *are* challenges with coming up for a =
YANG model for TCP. But if RFC 4898 got it wrong, we could learn from =
that, IMHO.

You are much more optimistic than I am.

Lars


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From: "Scharf, Michael" 
To: Lars Eggert 
CC: Michael Tuexen , tcpm IETF list , "draft-scharf-tcpm-yang-tcp@ietf.org" 
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From: Joseph Touch 
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Date: Fri, 27 Mar 2020 08:02:51 -0700
Cc: Lars Eggert , "draft-scharf-tcpm-yang-tcp@ietf.org" , tcpm IETF list , Michael Tuexen 
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Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Hi, all,

I agree with Lars that, in effect, encoding certain stats in the YANG =
model runs the risk of making them =E2=80=9Cexpected=E2=80=9D in an =
implementation; if that=E2=80=99s desired, the process should be =
inverted (decide what we think is necessary THEN add it; don=E2=80=99t =
let the model drive the requirements).=20

That would be a LOT of work, equivalent to extending the API for TCP. If =
that happens, we need to be VERY careful to not burden implementers with =
implementation details or requirements.

As to MD5, agreed that it=E2=80=99s important to include, but I would =
even go so far as to put it under a subtree of =E2=80=9CDeprecated=E2=80=9D=
 components to make it very clear to everyone who uses them.

Joe


> On Mar 27, 2020, at 7:49 AM, Scharf, Michael =
 wrote:
>=20
> I am not an expert for SNMP under Linux. But, at first sight, =
/proc/net/snmp provides basically all scalars from the TCP-MIB. The =
connection table seems missing. But those objects I would only expect =
when actually managing a Linux system by the SNMP protocol, not in the =
proc file system.
> =20
> Search engines find quite a number of implementer questions on =
=E2=80=9E/proc/net/snmp=E2=80=9C. So, it seems relatively likely that =
there is some use. And in the area of SNMP network management, there is =
often not much public documentation, so a professor may not be able to =
figure out any details of deployed systems.
> =20
> Regarding MD5, I get told that there is still running code and =
operational deployment, even if TCP-AO is getting traction. As users =
seem to ask for it, my proposal would be to add big warning signs that =
it is deprecated, i.e., TCP-AO should be used instead. On that aspect, =
the other authors could maybe also chime in.
> =20
> Michael
> =20
> =20
> Von: Lars Eggert 
> Gesendet: Freitag, 27. M=C3=A4rz 2020 15:15
> An: Scharf, Michael 
> Cc: Michael Tuexen ; tcpm IETF list =
; draft-scharf-tcpm-yang-tcp@ietf.org =

> Betreff: Re: [tcpm] Request for feedback on WG adoption of =
draft-scharf-tcpm-yang-tcp-04
> =20
> Hi,
> =20
> On 2020-3-27, at 15:52, Scharf, Michael =
> =
wrote:
> > But, wait a second: I recommend to have a look at the output of =
=E2=80=9Ecat /proc/net/snmp=E2=80=9C under Linux (just tested on Debian =
Buster)=E2=80=A6
> >
> > As far as I can see, these are the object definitions from the =
TCP-MIB. If implemented on Linux, why does the TCP-MIB not matter?
> =20
> /proc/net/snmp provides the scalars (a small subset of 4022), and =
obviously just in text form. Are you aware of any uses?
> =20
> > However, we have learnt from that: We have explicitly decided not to =
include extended statistics in draft-scharf-tcpm-yang-tcp. The draft =
currently only includes basic stats.
> =20
> Well, basic stats and AO detail. (And why still MD5? We obsoleted 2385 =
ten years ago.)
> =20
> > It is well understood that there *are* challenges with coming up for =
a YANG model for TCP. But if RFC 4898 got it wrong, we could learn from =
that, IMHO.
> =20
> You are much more optimistic than I am.
> =20
> Lars
> =20
> =20
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org 
> https://www.ietf.org/mailman/listinfo/tcpm =


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Hi, =
all,

I agree with =
Lars that, in effect, encoding certain stats in the YANG model runs the =
risk of making them =E2=80=9Cexpected=E2=80=9D in an implementation; if =
that=E2=80=99s desired, the process should be inverted (decide what we =
think is necessary THEN add it; don=E2=80=99t let the model drive the =
requirements). 

That would be a LOT of work, equivalent to extending the API =
for TCP. If that happens, we need to be VERY careful to not burden =
implementers with implementation details or requirements.

As to MD5, agreed that =
it=E2=80=99s important to include, but I would even go so far as to put =
it under a subtree of =E2=80=9CDeprecated=E2=80=9D components to make it =
very clear to everyone who uses them.

Joe


On Mar 27, 2020, at 7:49 AM, Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:

I am not =
an expert for SNMP under Linux. But, at first sight, /proc/net/snmp =
provides basically all scalars from the TCP-MIB. The connection table =
seems missing. But those objects I would only expect when actually =
managing a Linux system by the SNMP protocol, not in the proc file =
system.
 
Search =
engines find quite a number of implementer questions on =
=E2=80=9E/proc/net/snmp=E2=80=9C. So, it seems relatively likely that =
there is some use. And in the area of SNMP network management, there is =
often not much public documentation, so a professor may not be able to =
figure out any details of deployed systems.
 
Regarding MD5, I get told that there is still running code =
and operational deployment, even if TCP-AO is getting traction. As users =
seem to ask for it, my proposal would be to add big warning signs that =
it is deprecated, i.e., TCP-AO should be used instead. On that aspect, =
the other authors could maybe also chime in.
 
Michael
 
 
Von: Lars Eggert
Gesendet: Freitag, 27. M=C3=A4rz =
2020 15:15
An: Scharf, Michael
Cc: Michael Tuexen; tcpm IETF list; draft-scharf-tcpm-yang-tcp@ietf.org
Betreff: Re: [tcpm] Request for =
feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
 
Hi,
 
On 2020-3-27, at 15:52, Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:
> But, wait a second: I recommend to =
have a look at the output of =E2=80=9Ecat /proc/net/snmp=E2=80=9C under =
Linux (just tested on Debian Buster)=E2=80=A6
>
> As far as I can =
see, these are the object definitions from the TCP-MIB. If implemented =
on Linux, why does the TCP-MIB not matter?
 
/proc/net/snmp provides the scalars (a small subset of 4022), =
and obviously just in text form. Are you aware of any uses?
 
> However, we have learnt from that: =
We have explicitly decided not to include extended statistics in =
draft-scharf-tcpm-yang-tcp. The draft currently only includes basic =
stats.
 
Well, =
basic stats and AO detail. (And why still MD5? We obsoleted 2385 ten =
years ago.)
 
> It =
is well understood that there *are* challenges with coming up for a YANG =
model for TCP. But if RFC 4898 got it wrong, we could learn from that, =
IMHO.
 
You are =
much more optimistic than I am.
 
Lars
 
 
_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

=

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From: "Scharf, Michael" 
To: Joseph Touch 
CC: Lars Eggert , "draft-scharf-tcpm-yang-tcp@ietf.org" , tcpm IETF list , Michael Tuexen 
Thread-Topic: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Hi Joe,

Regarding stats, this is a YANG =84feature=93 in draft -04. That explicitly=
 specifies that a NETCONF server compliant to the YANG model does not have =
to provide the stats. We added this because of your past comment on that.

For the stats, -04 relatively closely follows the TCP-MIB (and the WG expli=
citly ask not to try a 1:1 mapping).

Given the pushback, here is a copy the current spec from -04:

    container statistics {
        if-feature statistics;
        config false;

        leaf active-opens {
          type yang:counter32;
          description
            "The number of times that TCP connections have made a direct
             transition to the SYN-SENT state from the CLOSED state.";
        }

        leaf passive-opens {
          type yang:counter32;
          description
            "The number of times TCP connections have made a direct
             transition to the SYN-RCVD state from the LISTEN state.";
        }

        leaf attempt-fails {
          type yang:counter32;
          description
            "The number of times that TCP connections have made a direct
             transition to the CLOSED state from either the SYN-SENT
             state or the SYN-RCVD state, plus the number of times that
             TCP connections have made a direct transition to the
             LISTEN state from the SYN-RCVD state.";
        }

        leaf establish-resets {
          type yang:counter32;
          description
            "The number of times that TCP connections have made a direct
             transition to the CLOSED state from either the ESTABLISHED
             state or the CLOSE-WAIT state.";
        }

        leaf currently-established {
          type yang:gauge32;
          description
            "The number of TCP connections for which the current state
             is either ESTABLISHED or CLOSE-WAIT.";
        }

        leaf in-segments {
          type yang:counter32;
          description
            "The total number of segments received, including those
             received in error.  This count includes segments received
             on currently established connections.";
        }

        leaf out-segments {
          type yang:counter32;
          description
            "The total number of segments sent, including those on
             current connections but excluding those containing only
             retransmitted octets.";
        }

        leaf retransmitted-segments {
          type yang:counter32;
          description
            "The total number of segments retransmitted; that is, the
             number of TCP segments transmitted containing one or more
             previously transmitted octets.";
        }

        leaf in-errors {
          type yang:counter32;
          description
            "The total number of segments received in error (e.g., bad
             TCP checksums).";
        }

        leaf out-resets {
          type yang:counter32;
          description
            "The number of TCP segments sent containing the RST flag.";
        }
=85

I fully agree that we can discuss every single entry. But, at least for the=
 stats, I don=92t think this is really a lot of work. It is a fairly short =
list quite similar to the deployed TCP-MIB. The assumption here is that the=
 TCP-MIB is a reasonable baseline. Is it really hard to agree on a list of =
counters in TCPM and publish this?

In addition, there is one difference between a YANG model (and in fact also=
 a MIB) and a TCP API: The TCP API is tightly coupled with the TCP protocol=
 implementation typically in the kernel. Network management apps using YANG=
 can run outside the kernel. There are certain dependencies to configure an=
d to retrieve operational state. Nonetheless, the implementer of a YANG mod=
el may not be the implementer of a TCP stack. That may limit the burden to =
the latter.

Stats, TCP-AO and MD5 (with appropriate flagging) actually look like pretty=
 low-hanging fruits to me. Of course, we need to discuss the modeling detai=
ls,  but it is a fairly narrow and well-defined scope. Is this part really =
the most challenging part of the document that prevents us from adopting a =
YANG model in TCPM?

Michael


Von: Joseph Touch
Gesendet: Freitag, 27. M=E4rz 2020 16:03
An: Scharf, Michael
Cc: Lars Eggert; draft-scharf-tcpm-yang-tcp@ietf.or=
g; tcpm IETF list; Michael Tuexen
Betreff: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcp=
m-yang-tcp-04

Hi, all,

I agree with Lars that, in effect, encoding certain stats in the YANG model=
 runs the risk of making them =93expected=94 in an implementation; if that=
=92s desired, the process should be inverted (decide what we think is neces=
sary THEN add it; don=92t let the model drive the requirements).

That would be a LOT of work, equivalent to extending the API for TCP. If th=
at happens, we need to be VERY careful to not burden implementers with impl=
ementation details or requirements.

As to MD5, agreed that it=92s important to include, but I would even go so =
far as to put it under a subtree of =93Deprecated=94 components to make it =
very clear to everyone who uses them.

Joe


On Mar 27, 2020, at 7:49 AM, Scharf, Michael > wrote:

I am not an expert for SNMP under Linux. But, at first sight, /proc/net/snm=
p provides basically all scalars from the TCP-MIB. The connection table see=
ms missing. But those objects I would only expect when actually managing a =
Linux system by the SNMP protocol, not in the proc file system.

Search engines find quite a number of implementer questions on =84/proc/net=
/snmp=93. So, it seems relatively likely that there is some use. And in the=
 area of SNMP network management, there is often not much public documentat=
ion, so a professor may not be able to figure out any details of deployed s=
ystems.

Regarding MD5, I get told that there is still running code and operational =
deployment, even if TCP-AO is getting traction. As users seem to ask for it=
, my proposal would be to add big warning signs that it is deprecated, i.e.=
, TCP-AO should be used instead. On that aspect, the other authors could ma=
ybe also chime in.

Michael


Von: Lars Eggert
Gesendet: Freitag, 27. M=E4rz 2020 15:15
An: Scharf, Michael
Cc: Michael Tuexen; tcpm IETF list; draft-scharf-tcpm-yang-tcp@ietf.org
Betreff: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcp=
m-yang-tcp-04

Hi,

On 2020-3-27, at 15:52, Scharf, Michael > wrote:
> But, wait a second: I recommend to have a look at the output of =84cat /p=
roc/net/snmp=93 under Linux (just tested on Debian Buster)=85
>
> As far as I can see, these are the object definitions from the TCP-MIB. I=
f implemented on Linux, why does the TCP-MIB not matter?

/proc/net/snmp provides the scalars (a small subset of 4022), and obviously=
 just in text form. Are you aware of any uses?

> However, we have learnt from that: We have explicitly decided not to incl=
ude extended statistics in draft-scharf-tcpm-yang-tcp. The draft currently =
only includes basic stats.

Well, basic stats and AO detail. (And why still MD5? We obsoleted 2385 ten =
years ago.)

> It is well understood that there *are* challenges with coming up for a YA=
NG model for TCP. But if RFC 4898 got it wrong, we could learn from that, I=
MHO.

You are much more optimistic than I am.

Lars


_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm


--_000_6EC6417807D9754DA64F3087E2E2E03E2DA3FCCFrznt8114rzntrzd_
Content-Type: text/html; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable










Hi Joe,


 


Regarding stats, this is a YANG =84feature=93 in dra=
ft -04. That explicitly specifies that a NETCONF server compliant to the YA=
NG model does not have to provide the stats. We added this because of your =
past comment on that.


 


For the stats, -04 relatively closely follows the TC=
P-MIB (and the WG explicitly ask not to try a 1:1 mapping).


 


Given the pushback, here is a copy the current spec =
from -04:


 


    container statistics {


        if-featur=
e statistics;


        config fa=
lse;


 


        leaf acti=
ve-opens {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The number of times that TCP connections have made a d=
irect


        &nbs=
p;    transition to the SYN-SENT state from the CLOSED state=
.";


        }


 


        leaf pass=
ive-opens {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The number of times TCP connections have made a direct=



        &nbs=
p;    transition to the SYN-RCVD state from the LISTEN state=
.";


        }


 


        leaf atte=
mpt-fails {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The number of times that TCP connections have made a d=
irect


        &nbs=
p;    transition to the CLOSED state from either the SYN-SEN=
T


        &nbs=
p;    state or the SYN-RCVD state, plus the number of times =
that


        &nbs=
p;    TCP connections have made a direct transition to the

        &nbs=
p;    LISTEN state from the SYN-RCVD state.";


        }


 


        leaf esta=
blish-resets {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The number of times that TCP connections have made a d=
irect


        &nbs=
p;    transition to the CLOSED state from either the ESTABLI=
SHED


        &nbs=
p;    state or the CLOSE-WAIT state.";


        }


 


        leaf curr=
ently-established {


        &nbs=
p; type yang:gauge32;


        &nbs=
p; description


        &nbs=
p;   "The number of TCP connections for which the current st=
ate


        &nbs=
p;    is either ESTABLISHED or CLOSE-WAIT.";


        }


 


        leaf in-s=
egments {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The total number of segments received, including those=



        &nbs=
p;    received in error.  This count includes segments =
received


        &nbs=
p;    on currently established connections.";


        }


 


        leaf out-=
segments {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The total number of segments sent, including those on<=
/p>

        &nbs=
p;    current connections but excluding those containing onl=
y


        &nbs=
p;    retransmitted octets.";


        }


 


        leaf retr=
ansmitted-segments {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The total number of segments retransmitted; that is, t=
he


        &nbs=
p;    number of TCP segments transmitted containing one or m=
ore


        &nbs=
p;    previously transmitted octets.";


        }


 


        leaf in-e=
rrors {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The total number of segments received in error (e.g., =
bad


        &nbs=
p;    TCP checksums).";


        }


 


        leaf out-=
resets {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The number of TCP segments sent containing the RST fla=
g.";


        }


=85


 


I fully agree that we can discuss every single entry=
. But, at least for the stats, I don=92t think this is really a lot of work=
. It is a fairly short list quite similar to the deployed TCP-MIB. The assu=
mption here is that the TCP-MIB is a
 reasonable baseline. Is it really hard to agree on a list of counters in T=
CPM and publish this?


 


In addition, there is one difference between a YANG =
model (and in fact also a MIB) and a TCP API: The TCP API is tightly couple=
d with the TCP protocol implementation typically in the kernel. Network man=
agement apps using YANG can run outside
 the kernel. There are certain dependencies to configure and to retrieve op=
erational state. Nonetheless, the implementer of a YANG model may not be th=
e implementer of a TCP stack. That may limit the burden to the latter.


 


Stats, TCP-AO and MD5 (with appropriate flagging) ac=
tually look like pretty low-hanging fruits to me. Of course, we need to dis=
cuss the modeling details,  but it is a fairly narrow and well-defined=
 scope. Is this part really the most challenging
 part of the document that prevents us from adopting a YANG model in TCPM?<=
/p>

 


Michael


 


 




Von: Joseph Touch

Gesendet: Freitag, 27. M=E4rz 2020 16:03

An: Scharf, Michae=
l

Cc: Lars Eggert; 
draft-scharf-tcpm-yang-tcp@ietf.org; t=
cpm IETF list;
Michael Tuexen

Betreff: Re: [tcpm] Request for feedback on WG adoption of draft-sch=
arf-tcpm-yang-tcp-04




 




Hi, all,






I agree with Lars that, in effect, encoding certain stats i=
n the YANG model runs the risk of making them =93expected=94 in an implemen=
tation; if that=92s desired, the process should be inverted (decide what we=
 think is necessary THEN add it; don=92t let
 the model drive the requirements). 







That would be a LOT of work, equivalent to extending the AP=
I for TCP. If that happens, we need to be VERY careful to not burden implem=
enters with implementation details or requirements.







As to MD5, agreed that it=92s important to include, but I w=
ould even go so far as to put it under a subtree of =93Deprecated=94 compon=
ents to make it very clear to everyone who uses them.







Joe










On Mar 27, 2020, at 7:49 AM, Scharf, Michael <Michael.Scharf@hs-esslin=
gen.de> wrote:









I am not an expert for SNMP under Linux. But, at first sight, /proc/net/snm=
p provides basically all scalars from the TCP-MIB. The connection table see=
ms missing. But those objects I would only expect when actually managing a =
Linux system by the SNMP protocol,
 not in the proc file system.



 



Search engines find quite a number of implementer questions on =84/proc/net=
/snmp=93. So, it seems relatively likely that there is some use. And in the=
 area of SNMP network management, there is often not much public documentat=
ion, so a professor may not be able
 to figure out any details of deployed systems.



 



Regarding MD5, I get told that there is still running code and operational =
deployment, even if TCP-AO is getting traction. As users seem to ask for it=
, my proposal would be to add big warning signs that it is deprecated, i.e.=
, TCP-AO should be used instead.
 On that aspect, the other authors could maybe also chime in.



 



Michael



 



 





Von: Lars Eggert

Gesendet: <=
/b>Freitag, 27. M=E4rz 2020 15:15

An: Scharf, Michael

Cc: Michael Tuexen; tcpm
 IETF list; draft-scharf-tcpm-yang-tcp@ietf.org

Betreff: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-=
tcp-04





 



Hi,



 



On 2020-3-27, at 15:52, Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:



> But, wait a second: I recommend to have a look at the output of =84cat=
 /proc/net/snmp=93 under Linux (just tested on Debian Buster)=85



>



> As far as I can see, these are the object definitions from the TCP-MIB=
. If implemented on Linux, why does the TCP-MIB not matter?



 



/proc/net/snmp provides the scalars (a small subset of 4022), and obviously=
 just in text form. Are you aware of any uses?



 



> However, we have learnt from that: We have explicitly decided not to i=
nclude extended statistics in draft-scharf-tcpm-yang-tcp. The draft current=
ly only includes basic stats.



 



Well, basic stats and AO detail. (And why still MD5? We obsoleted 2385 ten =
years ago.)



 



> It is well understood that there *are* challenges with coming up for a=
 YANG model for TCP. But if RFC 4898 got it wrong, we could learn from that=
, IMHO.



 



You are much more optimistic than I am.



 



Lars



 



 



___________________=
____________________________

tcpm
 mailing list

tcpm@ietf.org

https://www.ietf.org/mailman/listinfo/t=
cpm














--_000_6EC6417807D9754DA64F3087E2E2E03E2DA3FCCFrznt8114rzntrzd_--


From nobody Fri Mar 27 09:26:39 2020
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To: Carles Gomez Montenegro 
Cc: tcpm IETF list , Jon Crowcroft 
References: <3326ed99-b077-592b-7913-aeb2286912c4@bobbriscoe.net> <13486113479ebcb344247daedda10467.squirrel@webmail.entel.upc.edu>  <3f4d3d94-24a8-4ed8-a752-ae5242907d43@gmx.at>    <391035ee6f57baa407f9be225db8dfbc.squirrel@webmail.entel.upc.edu> <44192613-4e05-bffa-a810-ef261d78d190@bobbriscoe.net> 
From: Bob Briscoe 
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Subject: Re: [tcpm] Sender control of Delayed ACKs (was Re: More motivating scenarios for tcpm-ack-pull)
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Carles,

On 26/03/2020 14:06, Carles Gomez Montenegro wrote:
> Hi Bob,
>
> Thanks a lot once again for all your comments!
>
> As you may have seen, we just published a -01, with the aim to address
> your comments.
>
> Please find below our inline responses:
>
>> Carles & Jon,
>>
>> Yes, if the tcpm WG was prepared to consider adopting this, I'd support
>> it.
>>
>> A few comments:
>>
>> I'm not sure I would limit it to "suppression" of delayed ACKs, and I
>> don't just mean it should include releasing suppression. In many
>> circumstances the sender would be happy with less frequent ACKs than the
>> receiver is generating. E.g. with high performance data transfers, 1/16
>> would often be fine when there are hundreds of packets in flight. But,
>> because the receiver can't be sure whether the sender would suffer one
>> of the downsides to delaying ACKs, it maintains a conservatively low
>> delayed ACK ratio.
>>
>> So perhaps a better scope (and title) would be "Sender control of
>> Delayed ACKs in TCP"?
>>
>> I've added 'in TCP', because I think it's useful to make the scope
>> concrete. But I think this doc could also be useful for other transport
>> protocols, particularly QUIC.
> Agreed!
>
> We have updated accordingly the document (including the title and abstract).
>
>> S3.1 & S3.2 Slow start & High bit rate environments and short data
>> segments
>>
>>      However, use of Delayed ACKs reduces the amount
>>      of ACKs received by the sender, thus reducing the rate of cwnd
>>      growth, increasing transfer time and reducing throughput, when
>>      compared with sending an ACK for each incoming data segment.
>>
>> I think ABC (appropriate byte counting) allows the sender to
>> unilaterally address that concern without needing ACK Pull [RFC3465].
> Thanks for the comment. Version -01 now reflects that ABC could be used to
> address the concern, while also mentioning that it remains as an
> experimental mechanism, not fully included in RFC 5681.
>
>> The reference to 'more rapidly get up to speed during slow-start without
>> overshoot' is a bit opaque. Rather than "describing by reference", it
>> needs to describe the lack of ability to send patterns of packets (e.g.
>> chirps) and be able to time the gaps between the ACKs. At minimum, the
>> citation should refer to Appendix B.4, which was the mechanism proposed
>> to do ACK pull at the time.
> Agreed. We have added a more explicit description in -01, and we also
> refer to Appendix B.4.
>
>> S.3.4 Beyond classic ACK transmission behavior
>>
>> It ought to mention that many link technologies (Satellite, DOCSIS, LTE,
>> WiFi, ...?) do TCP ACK thinning 'cos TCP doesn't do it itself, but it
>> improves performance (when the ACK stream becomes the bottleneck for the
>> forward path, because many reverse paths have pathetic bandwidth, esp.
>> if a parallel upload is going on).
>>
>> See "ACK Scaling and Performance on AsymmetricPaths"
>> https://erg.abdn.ac.uk/~downloads/ackscaling.pdf
> Agreed. Added in -01. And thanks for the pointer!

[BB]
                 Examples of technologies where deployments have
                 been reported to do ACK thinning include satellite 
links, DOCSIS
                 cable networks, mobile cellular networks, among others.

For DOCSIS at least I know that it's not just a case of "deployments 
have been reported". TCP ACK thinning is in the DOCSIS spec [DOCSIS3.1].

Also, I've just been talking with a colleague, who tells me that in WiFi 
(sorry, don't know how widely this applies), if there are multiple TCP 
ACKs for the same flow in the transmit queue, it will remove them all 
except the last when it transmits the queue. Also [Kim06] includes 
pseudocode for a model of WiFi ACK thinning.


  [DOCSIS3.1] CableLabs, "MAC and Upper Layer Protocols Interface 
(MULPI) Specification, CM-SP-MULPIv3.1", Data-Over-Cable Service 
Interface Specifications DOCSIS(R) 3.1, 
.

[Kim06] Hyogon Kim, Hyogon Kim, Heejo Lee, Heejo Lee, Sangmin Shin and 
Inhye Kang, "On the Cross-Layer Impact of TCP ACK Thinning on IEEE 
802.11 Wireless MAC Dynamics"     DOI: 10.1109/VTCF.2006.463 In Proc. 
64th IEEE Vehicular Technology Conference, VTC 25-28 (September 2006)



Nit:
s/may allow alleviating congestion on that path/
  /may allow congestion on that path to be alleviated/


>
>> 4.2. Per-segment granularity
>>
>> Between per-segment and permanent, there's per-connection suppression.
>> I'm not saying that would be any use, I'm just saying it doesn't have to
>> be permanent.
> Agreed! Added in -01.
>
>> 4.4 Support for enabling generic ACK ratios
>>
>> This reminds me of a subtle additional requirement. When you move from
>> ACK pull to controlling the ACK ratio, there's an important distinction
>> between a sender's packet stopping the receiver delaying the ACK for
>> /that/ packet (as in ACK pull), vs. setting the receiver's Delayed ACK
>> policy for /that and subsequent/ packets.
>>
>> This raises the question, should the mechanism use soft state (repeated
>> in every packet), or connection state (remembered by the receiver)?
>> Which is hinted at in your section on "safe return to normal operation".x
> We have added text in section 4.4, with the aim to incorporate your
> comments above.

[BB]

                 The desired generic ACK ratio is intended to be in 
force for the
                 current data segment, and for subsequent data segments 
(at least,
                 during a time interval of a duration that may depend on 
several
                 factors).

I didn't mean to say "that packet and subsequent packets" should be the 
only requirement. The original ACK pull pattern where the pull is just 
for "that packet" is also a valid possibility. They are just different 
models. If the mechanism ends up using a field in the main TCP header, 
then presumably it will be sent on every packet, and therefore there's 
no need to say what the behaviour should be in the absence of any 
request on subsequent packets.


>
>> 4.10+ Extra requirement: Who's in control?
>>
>> The receiver cannot be expected to control ACKs in any way the sender
>> wants, which it will not always be able to honour anyway. So the
>> semantics have to be of a hint, not a request or a command. Then there's
>> the question of whether the receiver just does what it wants, or whether
>> it ought to tell the sender it's not doing what it was asked.
>>
>> It might seem that the the receiver silently not doing what it's told is
>> the simple case. However,  it adds complexity to anything trying to rely
>> on the behaviour (e.g. the slow start examples).
> We have added the new requirement, and have edited its content, based on
> your input.

[BB] Thanks for picking up all my comments so willingly.

It occurs to me that there's probably not much point in a message from 
the receiver saying whether it is complying with the request or not. The 
sender can detect which ACKs are arriving, so it knows the truth, 
whatever the receiver says it's doing. It sort-of might be useful to 
know what the receiver says it's trying to do, to know how the network 
might be intervening. But, if ground truth doesn't match what the 
receiver says it's doing, the sender doesn't know whether the receiver 
is lying, or whether the network is thinning ACKs.

>> A good first draft.
>> Thank you.
> Once again, thanks a lot for your comments!

[BB] I suggest you ask the chairs how to go about asking for an adoption 
call, given that ought to be able to happen on the ML given we might not 
have a f2f meeting for some time.

Cheers



Bob

>
> Best regards,
>
> Carles
>
>
>> Bob

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/


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    Carles,

    

    
On 26/03/2020 14:06, Carles Gomez
      Montenegro wrote:

    

    

      
Hi Bob,

Thanks a lot once again for all your comments!

As you may have seen, we just published a -01, with the aim to address
your comments.

Please find below our inline responses:



      

        
Carles & Jon,

Yes, if the tcpm WG was prepared to consider adopting this, I'd support
it.

A few comments:

I'm not sure I would limit it to "suppression" of delayed ACKs, and I
don't just mean it should include releasing suppression. In many
circumstances the sender would be happy with less frequent ACKs than the
receiver is generating. E.g. with high performance data transfers, 1/16
would often be fine when there are hundreds of packets in flight. But,
because the receiver can't be sure whether the sender would suffer one
of the downsides to delaying ACKs, it maintains a conservatively low
delayed ACK ratio.

So perhaps a better scope (and title) would be "Sender control of
Delayed ACKs in TCP"?

I've added 'in TCP', because I think it's useful to make the scope
concrete. But I think this doc could also be useful for other transport
protocols, particularly QUIC.


      

      
Agreed!

We have updated accordingly the document (including the title and abstract).



      

        
S3.1 & S3.2 Slow start & High bit rate environments and short data
segments

    However, use of Delayed ACKs reduces the amount
    of ACKs received by the sender, thus reducing the rate of cwnd
    growth, increasing transfer time and reducing throughput, when
    compared with sending an ACK for each incoming data segment.

I think ABC (appropriate byte counting) allows the sender to
unilaterally address that concern without needing ACK Pull [RFC3465].


      

      
Thanks for the comment. Version -01 now reflects that ABC could be used to
address the concern, while also mentioning that it remains as an
experimental mechanism, not fully included in RFC 5681.



      

        
The reference to 'more rapidly get up to speed during slow-start without
overshoot' is a bit opaque. Rather than "describing by reference", it
needs to describe the lack of ability to send patterns of packets (e.g.
chirps) and be able to time the gaps between the ACKs. At minimum, the
citation should refer to Appendix B.4, which was the mechanism proposed
to do ACK pull at the time.


      

      
Agreed. We have added a more explicit description in -01, and we also
refer to Appendix B.4.



      

        
S.3.4 Beyond classic ACK transmission behavior

It ought to mention that many link technologies (Satellite, DOCSIS, LTE,
WiFi, ...?) do TCP ACK thinning 'cos TCP doesn't do it itself, but it
improves performance (when the ACK stream becomes the bottleneck for the
forward path, because many reverse paths have pathetic bandwidth, esp.
if a parallel upload is going on).

See "ACK Scaling and Performance on AsymmetricPaths"
https://erg.abdn.ac.uk/~downloads/ackscaling.pdf


      

      
Agreed. Added in -01. And thanks for the pointer!

    

    

    [BB] 

                    Examples of technologies where deployments
      have    

                    been reported to do ACK thinning include
      satellite links, DOCSIS    

                    cable networks, mobile cellular networks,
      among others.

    

    For DOCSIS at least I know that it's not just a case of "deployments
    have been reported". TCP ACK thinning is in the DOCSIS spec
    [DOCSIS3.1]. 

    

    Also, I've just been talking with a colleague, who tells me that in
    WiFi (sorry, don't know how widely this applies), if there are
    multiple TCP ACKs for the same flow in the transmit queue, it will
    remove them all except the last when it transmits the queue. Also
    [Kim06] includes pseudocode for a model of WiFi ACK thinning.

    

    

     [DOCSIS3.1] CableLabs, "MAC and Upper Layer Protocols Interface
    (MULPI) Specification, CM-SP-MULPIv3.1", Data-Over-Cable Service
    Interface Specifications DOCSIS(R) 3.1,
    <https://specification-search.cablelabs.com/CM-SP-MULPIv3.1>.

    

    [Kim06] Hyogon Kim, Hyogon Kim, Heejo Lee, Heejo Lee, Sangmin Shin
    and Inhye Kang, "On the Cross-Layer Impact of TCP ACK Thinning on
    IEEE 802.11 Wireless MAC Dynamics"     DOI: 10.1109/VTCF.2006.463 In
    Proc. 64th IEEE Vehicular Technology Conference, VTC 25-28
    (September 2006)

        

    

    

    Nit:

    s/may allow alleviating congestion on that
      path/

     /may allow congestion on that path to be  alleviated/

    

    

    

      



      

        
4.2. Per-segment granularity

Between per-segment and permanent, there's per-connection suppression.
I'm not saying that would be any use, I'm just saying it doesn't have to
be permanent.


      

      
Agreed! Added in -01.



      

        
4.4 Support for enabling generic ACK ratios

This reminds me of a subtle additional requirement. When you move from
ACK pull to controlling the ACK ratio, there's an important distinction
between a sender's packet stopping the receiver delaying the ACK for
/that/ packet (as in ACK pull), vs. setting the receiver's Delayed ACK
policy for /that and subsequent/ packets.

This raises the question, should the mechanism use soft state (repeated
in every packet), or connection state (remembered by the receiver)?
Which is hinted at in your section on "safe return to normal operation".x


      

      
We have added text in section 4.4, with the aim to incorporate your
comments above.

    

    

    [BB] 

    

                    The desired generic ACK ratio is intended to be
      in force for the    

                    current data segment, and for subsequent
      data segments (at least,    

                    during a time interval of a duration that
      may depend on several    

                    factors).

    

    I didn't mean to say "that packet and subsequent packets" should be
    the only requirement. The original ACK pull pattern where the pull
    is just for "that packet" is also a valid possibility. They are just
    different models. If the mechanism ends up using a field in the main
    TCP header, then presumably it will be sent on every packet, and
    therefore there's no need to say what the behaviour should be in the
    absence of any request on subsequent packets. 

    

    

    

      



      

        
4.10+ Extra requirement: Who's in control?

The receiver cannot be expected to control ACKs in any way the sender
wants, which it will not always be able to honour anyway. So the
semantics have to be of a hint, not a request or a command. Then there's
the question of whether the receiver just does what it wants, or whether
it ought to tell the sender it's not doing what it was asked.

It might seem that the the receiver silently not doing what it's told is
the simple case. However,  it adds complexity to anything trying to rely
on the behaviour (e.g. the slow start examples).


      

      
We have added the new requirement, and have edited its content, based on
your input.


    

    

    [BB] Thanks for picking up all my comments so willingly.

    

    It occurs to me that there's probably not much point in a message
    from the receiver saying whether it is complying with the request or
    not. The sender can detect which ACKs are arriving, so it knows the
    truth, whatever the receiver says it's doing. It sort-of might be
    useful to know what the receiver says it's trying to do, to know how
    the network might be intervening. But, if ground truth doesn't match
    what the receiver says it's doing, the sender doesn't know whether
    the receiver is lying, or whether the network is thinning ACKs. 

    

    

      

      

        
A good first draft.
Thank you.


      

      
Once again, thanks a lot for your comments!

    

    

    [BB] I suggest you ask the chairs how to go about asking for an
    adoption call, given that ought to be able to happen on the ML given
    we might not have a f2f meeting for some time.

    

    Cheers

    

    

    

    Bob

    

    

      

Best regards,

Carles




      

        
Bob


      

      

    

    

    
-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/

  


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From: Praveen Balasubramanian 
To: "Scharf, Michael" , Joseph Touch 
CC: Michael Tuexen , "draft-scharf-tcpm-yang-tcp@ietf.org" , tcpm IETF list 
Thread-Topic: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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FWIW these are the publicly documented global stats in Windows TCP:
  union {
    DWORD             dwRtoAlgorithm;
    TCP_RTO_ALGORITHM RtoAlgorithm;
  };
  DWORD dwRtoMin;
  DWORD dwRtoMax;
  DWORD dwMaxConn;
  DWORD dwActiveOpens;
  DWORD dwPassiveOpens;
  DWORD dwAttemptFails;
  DWORD dwEstabResets;
  DWORD dwCurrEstab;
  DWORD dwInSegs;
  DWORD dwOutSegs;
  DWORD dwRetransSegs;
  DWORD dwInErrs;
  DWORD dwOutRsts;
  DWORD dwNumConns;

There are per connection stats too. Everything is based on MIB AFAIK. We ha=
ve had some new additions over time for the per connection stats. 32 bits i=
s now insufficient for InSegs and OutSegs and can and does overflow.

What are the implications of a YANG model to existing TCP implementations?

From: tcpm  On Behalf Of Scharf, Michael
Sent: Friday, March 27, 2020 8:52 AM
To: Joseph Touch 
Cc: Michael Tuexen ; draft-scharf-tcpm-yang-tcp@ietf=
.org; tcpm IETF list 
Subject: [EXTERNAL] Re: [tcpm] Request for feedback on WG adoption of draft=
-scharf-tcpm-yang-tcp-04

Hi Joe,

Regarding stats, this is a YANG "feature" in draft -04. That explicitly spe=
cifies that a NETCONF server compliant to the YANG model does not have to p=
rovide the stats. We added this because of your past comment on that.

For the stats, -04 relatively closely follows the TCP-MIB (and the WG expli=
citly ask not to try a 1:1 mapping).

Given the pushback, here is a copy the current spec from -04:

    container statistics {
        if-feature statistics;
        config false;

        leaf active-opens {
          type yang:counter32;
          description
            "The number of times that TCP connections have made a direct
             transition to the SYN-SENT state from the CLOSED state..";
        }

        leaf passive-opens {
          type yang:counter32;
          description
            "The number of times TCP connections have made a direct
             transition to the SYN-RCVD state from the LISTEN state..";
        }

        leaf attempt-fails {
          type yang:counter32;
          description
            "The number of times that TCP connections have made a direct
             transition to the CLOSED state from either the SYN-SENT
             state or the SYN-RCVD state, plus the number of times that
             TCP connections have made a direct transition to the
             LISTEN state from the SYN-RCVD state.";
        }

        leaf establish-resets {
          type yang:counter32;
          description
            "The number of times that TCP connections have made a direct
             transition to the CLOSED state from either the ESTABLISHED
             state or the CLOSE-WAIT state.";
        }

        leaf currently-established {
          type yang:gauge32;
          description
            "The number of TCP connections for which the current state
             is either ESTABLISHED or CLOSE-WAIT.";
        }

        leaf in-segments {
          type yang:counter32;
          description
            "The total number of segments received, including those
             received in error.  This count includes segments received
             on currently established connections.";
        }

        leaf out-segments {
          type yang:counter32;
          description
            "The total number of segments sent, including those on
             current connections but excluding those containing only
             retransmitted octets.";
        }

        leaf retransmitted-segments {
          type yang:counter32;
          description
            "The total number of segments retransmitted; that is, the
             number of TCP segments transmitted containing one or more
             previously transmitted octets.";
        }

        leaf in-errors {
          type yang:counter32;
          description
            "The total number of segments received in error (e.g., bad
             TCP checksums).";
        }

        leaf out-resets {
          type yang:counter32;
          description
            "The number of TCP segments sent containing the RST flag.";
        }
...

I fully agree that we can discuss every single entry.. But, at least for th=
e stats, I don't think this is really a lot of work.. It is a fairly short =
list quite similar to the deployed TCP-MIB. The assumption here is that the=
 TCP-MIB is a reasonable baseline. Is it really hard to agree on a list of =
counters in TCPM and publish this?

In addition, there is one difference between a YANG model (and in fact also=
 a MIB) and a TCP API: The TCP API is tightly coupled with the TCP protocol=
 implementation typically in the kernel. Network management apps using YANG=
 can run outside the kernel. There are certain dependencies to configure an=
d to retrieve operational state. Nonetheless, the implementer of a YANG mod=
el may not be the implementer of a TCP stack. That may limit the burden to =
the latter.

Stats, TCP-AO and MD5 (with appropriate flagging) actually look like pretty=
 low-hanging fruits to me. Of course, we need to discuss the modeling detai=
ls,  but it is a fairly narrow and well-defined scope. Is this part really =
the most challenging part of the document that prevents us from adopting a =
YANG model in TCPM?

Michael


Von: Joseph Touch
Gesendet: Freitag, 27. M=E4rz 2020 16:03
An: Scharf, Michael
Cc: Lars Eggert; draft-scharf-tcpm-yang-tcp@ietf.or=
g; tcpm IETF list; Michael Tuexen
Betreff: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcp=
m-yang-tcp-04

Hi, all,

I agree with Lars that, in effect, encoding certain stats in the YANG model=
 runs the risk of making them "expected" in an implementation; if that's de=
sired, the process should be inverted (decide what we think is necessary TH=
EN add it; don't let the model drive the requirements).

That would be a LOT of work, equivalent to extending the API for TCP. If th=
at happens, we need to be VERY careful to not burden implementers with impl=
ementation details or requirements.

As to MD5, agreed that it's important to include, but I would even go so fa=
r as to put it under a subtree of "Deprecated" components to make it very c=
lear to everyone who uses them.

Joe



On Mar 27, 2020, at 7:49 AM, Scharf, Michael > wrote:

I am not an expert for SNMP under Linux. But, at first sight, /proc/net/snm=
p provides basically all scalars from the TCP-MIB. The connection table see=
ms missing. But those objects I would only expect when actually managing a =
Linux system by the SNMP protocol, not in the proc file system.

Search engines find quite a number of implementer questions on "/proc/net/s=
nmp". So, it seems relatively likely that there is some use. And in the are=
a of SNMP network management, there is often not much public documentation,=
 so a professor may not be able to figure out any details of deployed syste=
ms.

Regarding MD5, I get told that there is still running code and operational =
deployment, even if TCP-AO is getting traction. As users seem to ask for it=
, my proposal would be to add big warning signs that it is deprecated, i.e.=
, TCP-AO should be used instead. On that aspect, the other authors could ma=
ybe also chime in.

Michael


Von: Lars Eggert
Gesendet: Freitag, 27. M=E4rz 2020 15:15
An: Scharf, Michael
Cc: Michael Tuexen; tcpm IETF list; draft-scharf-tcpm-yang-tcp@ietf.org
Betreff: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcp=
m-yang-tcp-04

Hi,

On 2020-3-27, at 15:52, Scharf, Michael > wrote:
> But, wait a second: I recommend to have a look at the output of "cat /pro=
c/net/snmp" under Linux (just tested on Debian Buster)...
>
> As far as I can see, these are the object definitions from the TCP-MIB.. =
If implemented on Linux, why does the TCP-MIB not matter?

/proc/net/snmp provides the scalars (a small subset of 4022), and obviously=
 just in text form. Are you aware of any uses?

> However, we have learnt from that: We have explicitly decided not to incl=
ude extended statistics in draft-scharf-tcpm-yang-tcp. The draft currently =
only includes basic stats.

Well, basic stats and AO detail. (And why still MD5? We obsoleted 2385 ten =
years ago.)

> It is well understood that there *are* challenges with coming up for a YA=
NG model for TCP. But if RFC 4898 got it wrong, we could learn from that, I=
MHO.

You are much more optimistic than I am.

Lars


_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm


--_000_BN3PR00MB01802468967593A6F90902E9B6CC0BN3PR00MB0180namp_
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FWIW these are the publicly documented global stats =
in Windows TCP:


  union {


    DWORD     &nbs=
p;       dwRtoAlgorithm;

    TCP_RTO_ALGORITHM RtoAlgorithm;


  };


  DWORD dwRtoMin;


  DWORD dwRtoMax;


  DWORD dwMaxConn;


  DWORD dwActiveOpens;


  DWORD dwPassiveOpens;


  DWORD dwAttemptFails;


  DWORD dwEstabResets;


  DWORD dwCurrEstab;


  DWORD dwInSegs;


  DWORD dwOutSegs;


  DWORD dwRetransSegs;


  DWORD dwInErrs;


  DWORD dwOutRsts;


  DWORD dwNumConns;


 


There are per connection stats too. Everything is ba=
sed on MIB AFAIK. We have had some new additions over time for the per conn=
ection stats. 32 bits is now insufficient for InSegs and OutSegs and can an=
d does overflow.


 


What are the implications of a YANG model to existin=
g TCP implementations?



 






From: tcpm <tcpm-bounces@ietf.org> O=
n Behalf Of 
Scharf, Michael

Sent: Friday, March 27, 2020 8:52 AM

To: Joseph Touch <touch@strayalpha.com>

Cc: Michael Tuexen <tuexen@fh-muenster.de>; draft-scharf-tcpm-=
yang-tcp@ietf.org; tcpm IETF list <tcpm@ietf.org>

Subject: [EXTERNAL] Re: [tcpm] Request for feedback on WG adoption o=
f draft-scharf-tcpm-yang-tcp-04






 




Hi Joe,


 


Regarding stats, this is a YANG „feature“=
; in draft -04. That explicitly specifies that a NETCONF server compliant t=
o the YANG model does not have to provide the stats. We added this because =
of your past comment on that.


 


For the stats, -04 relatively closely follows the TC=
P-MIB (and the WG explicitly ask not to try a 1:1 mapping).


 


Given the pushback, here is a copy the current spec =
from -04:


 


    container statistics {=



        if-featur=
e statistics;


        config fa=
lse;


 


        leaf acti=
ve-opens {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The number of times that TCP connections have made a d=
irect


        &nbs=
p;    transition to the SYN-SENT state from the CLOSED state=
..";


        }


 


        leaf pass=
ive-opens {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The number of times TCP connections have made a direct=



        &nbs=
p;    transition to the SYN-RCVD state from the LISTEN state=
..";


        }


 


        leaf atte=
mpt-fails {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The number of times that TCP connections have made a d=
irect


        &nbs=
p;    transition to the CLOSED state from either the SYN-SEN=
T


        &nbs=
p;    state or the SYN-RCVD state, plus the number of times =
that


        &nbs=
p;    TCP connections have made a direct transition to the


        &nbs=
p;    LISTEN state from the SYN-RCVD state.";


        }


 


        leaf esta=
blish-resets {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The number of times that TCP connections have made a d=
irect


        &nbs=
p;    transition to the CLOSED state from either the ESTABLI=
SHED


        &nbs=
p;    state or the CLOSE-WAIT state.";


        }


 


        leaf curr=
ently-established {


        &nbs=
p; type yang:gauge32;


        &nbs=
p; description


        &nbs=
p;   "The number of TCP connections for which the current st=
ate


        &nbs=
p;    is either ESTABLISHED or CLOSE-WAIT.";=



        }


 


        leaf in-s=
egments {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The total number of segments received, including those=



        &nbs=
p;    received in error.  This count includes segments =
received


        &nbs=
p;    on currently established connections.";


        }


 


        leaf out-=
segments {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The total number of segments sent, including those on<=
o:p>


        &nbs=
p;    current connections but excluding those containing onl=
y


        &nbs=
p;    retransmitted octets.";


        }


 


        leaf retr=
ansmitted-segments {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The total number of segments retransmitted; that is, t=
he


        &nbs=
p;    number of TCP segments transmitted containing one or m=
ore


        &nbs=
p;    previously transmitted octets.";


        }


 


        leaf in-e=
rrors {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The total number of segments received in error (e.g., =
bad


        &nbs=
p;    TCP checksums).";


        }


 


        leaf out-=
resets {


        &nbs=
p; type yang:counter32;


        &nbs=
p; description


        &nbs=
p;   "The number of TCP segments sent containing the RST fla=
g.";


        }


…


 


I fully agree that we can discuss every single entry=
.. But, at least for the stats, I don’t think this is really a lot of=
 work.. It is a fairly short list quite similar to the deployed TCP-MIB. Th=
e assumption here is that the TCP-MIB is
 a reasonable baseline. Is it really hard to agree on a list of counters in=
 TCPM and publish this?


 


In addition, there is one difference between a YANG =
model (and in fact also a MIB) and a TCP API: The TCP API is tightly couple=
d with the TCP protocol implementation typically in the kernel. Network man=
agement apps using YANG can run outside
 the kernel. There are certain dependencies to configure and to retrieve op=
erational state. Nonetheless, the implementer of a YANG model may not be th=
e implementer of a TCP stack. That may limit the burden to the latter.=



 


Stats, TCP-AO and MD5 (with appropriate flagging) ac=
tually look like pretty low-hanging fruits to me. Of course, we need to dis=
cuss the modeling details,  but it is a fairly narrow and well-defined=
 scope. Is this part really the most challenging
 part of the document that prevents us from adopting a YANG model in TCPM?<=
o:p>


 


Michael


 


 




Von: =
Joseph Touch

Gesendet: Freitag, 27. M=E4rz 2020 16:03

An: Scharf, Michae=
l

Cc: Lars Eggert; 
draft-scharf-tcpm-yang-tcp@ietf.org; t=
cpm IETF list;
Michael Tuexen

Betreff: Re: [tcpm] Request for feedback on WG adoption of draft-sch=
arf-tcpm-yang-tcp-04




 






Hi, all, 




 






I agree with Lars that, in effect, encoding certain =
stats in the YANG model runs the risk of making them “expected”=
 in an implementation; if that’s desired, the process should be inver=
ted (decide what we think is necessary THEN add it;
 don’t let the model drive the requirements). 






 






That would be a LOT of work, equivalent to extending=
 the API for TCP. If that happens, we need to be VERY careful to not burden=
 implementers with implementation details or requirements.






 






As to MD5, agreed that it’s important to inclu=
de, but I would even go so far as to put it under a subtree of “Depre=
cated” components to make it very clear to everyone who uses them.






 






Joe






 















On Mar 27, 2020, at 7:49 AM, Scharf, Michael <Michael.Scharf@hs-esslingen.=
de> wrote:




 








I am not an expert for SNMP under Linux. But, at fir=
st sight, /proc/net/snmp provides basically all scalars from the TCP-MIB. T=
he connection table seems missing. But those objects I would only expect wh=
en actually managing a Linux system
 by the SNMP protocol, not in the proc file system.






 






Search engines find quite a number of implementer qu=
estions on „/proc/net/snmp“. So, it seems relatively likely tha=
t there is some use. And in the area of SNMP network management, there is o=
ften not much public documentation, so a professor
 may not be able to figure out any details of deployed systems.<=
/p>





 






Regarding MD5, I get told that there is still runnin=
g code and operational deployment, even if TCP-AO is getting traction. As u=
sers seem to ask for it, my proposal would be to add big warning signs that=
 it is deprecated, i.e., TCP-AO should
 be used instead. On that aspect, the other authors could maybe also chime =
in.






 






Michael






 






 








Von: <=
/span>Lars Eggert

Gesendet: Freitag,=
 27. M=E4rz 2020 15:15

An: Scharf, Michael

Cc: Michael Tuexen; tcpm IETF list;<=
span class=3D"apple-converted-space"> draft-scharf-tcpm-yang-tcp@ietf.org

Betreff: Re: [tcpm=
] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04=









 






Hi,






 






On 2020-3-27, at 15:52, Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:






> But, wait a second: I recommend to have a look =
at the output of „cat /proc/net/snmp“ under Linux (just tested =
on Debian Buster)…






> 






> As far as I can see, these are the object defin=
itions from the TCP-MIB.. If implemented on Linux, why does the TCP-MIB not=
 matter?






 






/proc/net/snmp provides the scalars (a small subset =
of 4022), and obviously just in text form. Are you aware of any uses?<=
/o:p>






 






> However, we have learnt from that: We have expl=
icitly decided not to include extended statistics in draft-scharf-tcpm-yang=
-tcp. The draft currently only includes basic stats.






 






Well, basic stats and AO detail. (And why still MD5?=
 We obsoleted 2385 ten years ago.)






 






> It is well understood that there *are* challeng=
es with coming up for a YANG model for TCP. But if RFC 4898 got it wrong, w=
e could learn from that, IMHO.






 






You are much more optimistic than I am.





 






Lars






 






 






_______________________________________________
tcpm mailing list

tcpm@ietf.org

https://www.ietf.org/mailma=
n/listinfo/tcpm








 










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Cc: Lars Eggert , "draft-scharf-tcpm-yang-tcp@ietf.org" , tcpm IETF list , Michael Tuexen 
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Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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> On Mar 27, 2020, at 8:51 AM, Scharf, Michael =
 wrote:
>=20
> Hi Joe,
> =20
> Regarding stats, this is a YANG =E2=80=9Efeature=E2=80=9C in draft =
-04. That explicitly specifies that a NETCONF server compliant to the =
YANG model does not have to provide the stats. We added this because of =
your past comment on that.

AOK, but is that clear in the model itself? I.e., is there a way that =
merely using that subtree of data forces the user to realize that it=E2=80=
=99s explicitly optional?

> For the stats, -04 relatively closely follows the TCP-MIB (and the WG =
explicitly ask not to try a 1:1 mapping).

AOK.

> ...
> I fully agree that we can discuss every single entry. But, at least =
for the stats, I don=E2=80=99t think this is really a lot of work.

Agreed; this isn=E2=80=99t onerous esp. if optional.

> In addition, there is one difference between a YANG model (and in fact =
also a MIB) and a TCP API: The TCP API is tightly coupled with the TCP =
protocol implementation typically in the kernel. Network management apps =
using YANG can run outside the kernel.

In-kernel or out-of-kernel are implementation decisions. Neither is =
driven by MIB vs YANG or even the TCP API (or TCP) itself, agreed.

My point is that we need to be careful to not make this model an =
explicit or implicit extension of the API. The optional part above =
should do that.

> ...
> Stats, TCP-AO and MD5 (with appropriate flagging) actually look like =
pretty low-hanging fruits to me. Of course, we need to discuss the =
modeling details,  but it is a fairly narrow and well-defined scope. Is =
this part really the most challenging part of the document that prevents =
us from adopting a YANG model in TCPM?

The TCP roadmap should help us understand what=E2=80=99s critical and =
not in this model, IMO.

Joe


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On Mar 27, 2020, at 8:51 AM, Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:

Hi Joe,
 
Regarding stats, this is a YANG =E2=80=9Efeature=E2=80=9C in =
draft -04. That explicitly specifies that a NETCONF server compliant to =
the YANG model does not have to provide the stats. We added this because =
of your past comment on that.

AOK, but is that clear in the model itself? I.e., =
is there a way that merely using that subtree of data forces the user to =
realize that it=E2=80=99s explicitly optional?

For the stats, -04 =
relatively closely follows the TCP-MIB (and the WG explicitly ask not to =
try a 1:1 mapping).

AOK.

...
I fully agree that we can =
discuss every single entry. But, at least for the stats, I don=E2=80=99t =
think this is really a lot of work.

Agreed; this isn=E2=80=99t onerous esp. if =
optional.

In addition, there is one difference between a YANG =
model (and in fact also a MIB) and a TCP API: The TCP API is tightly =
coupled with the TCP protocol implementation typically in the kernel. =
Network management apps using YANG can run outside the kernel. =


In-kernel or =
out-of-kernel are implementation decisions. Neither is driven by MIB vs =
YANG or even the TCP API (or TCP) itself, agreed.

My point is that we need to be careful to not make =
this model an explicit or implicit extension of the API. The optional =
part above should do that.

...
Stats, TCP-AO and MD5 (with appropriate =
flagging) actually look like pretty low-hanging fruits to me. Of course, =
we need to discuss the modeling details,  but it is a fairly narrow =
and well-defined scope. Is this part really the most challenging part of =
the document that prevents us from adopting a YANG model in =
TCPM?

The TCP =
roadmap should help us understand what=E2=80=99s critical and not in =
this model, IMO.

Joe

=

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From: "Scharf, Michael" 
To: Joseph Touch 
CC: Lars Eggert , "draft-scharf-tcpm-yang-tcp@ietf.org" , tcpm IETF list , Michael Tuexen 
Thread-Topic: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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From: "Scharf, Michael" 
To: Praveen Balasubramanian , Joseph Touch 
CC: Michael Tuexen , "draft-scharf-tcpm-yang-tcp@ietf.org" , tcpm IETF list 
Thread-Topic: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Subject: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
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Hi Praveen,

Thanks a lot for feedback!

The hint on counter overflow is excellent feedback. We should probably chan=
ge at least the two counters to 64 bit in the next version of the I-D. (And=
, while it seems obvious, I wasn't aware of that. Aren't these sort of deta=
ils a good reason to discuss the modeling in TCPM?)

Regarding the implications on existing TCP implementations:

I think the answer depends a lot on how the TCP implementation is managed a=
s of today. If a device is already managed by NETCONF, e.g., because it is =
a modern router or another network device (optical switch, access node, etc=
.), a YANG model for TCP offers a standard way to configure the TCP stack o=
n that device. This could possibly replace, or complement, vendor-specific =
YANG models. That device could either implement the YANG model itself (e.g.=
, stats when deprecating the TCP MIB), or only import subsets of the model,=
 e.g., certain definitions (say, the TCP-AO parameters if the device needs =
TCP-AO). The question whether to implement an IETF YANG model will be owned=
 by the implementer and governed by the product roadmap, which is typically=
 driven by commercial customer demand.

For TCP stacks that are currently not managed by NETCONF, which most likely=
 includes all main desktop and server PC operating systems, the YANG model =
probably has no immediate implications. For instance, I would be somewhat s=
urprised if desktop and server operating systems would migrate from their e=
xisting management interfaces to NETCONF/YANG. Without the NETCONF (or REST=
CONF) protocol, it is difficult to actually implement a YANG model complete=
ly. A more realistic future is that operating systems could perhaps follow =
the YANG model object naming and definitions within their own interfaces, e=
.g., to complement or replace entries taken from the old TCP MIB. For insta=
nce, this could include the Linux /proc/ system or a new version of the Win=
dows stats you have shown, at some point in future. As always, it would be =
up to the implementers to make their call whether to do so, and when. Also,=
 as existing management interfaces may not have equivalent to all YANG func=
tionality, implementers may have to make some adoptions regarding syntax an=
d semantics in any case. This is no different to what has happened to the T=
CP MIB in the past. For instance, an operating system could use for 64 bit =
counter variants definitions from a new YANG model, instead of the TCP MIB.

And there may be more use cases beyond these two cases. This also depends o=
n the scope of the YANG model, which is open for discussion - stats are pro=
bably easier than configuration.

In any case, it is always up to implementers to decide whether to use YANG =
models, and, if so, to which extend. The management plane is much more hete=
rogeneous than the data/control plane in IP networks. The IETF has publishe=
d many YANG models already, and many MIBs in the past. I think some MIBs so=
me are more widely implemented than others, and the same will most likely h=
appen to IETF YANG models, too.

Best regards

Michael


From: Praveen Balasubramanian 
Sent: Friday, March 27, 2020 5:42 PM
To: Scharf, Michael ; Joseph Touch 
Cc: Michael Tuexen ; draft-scharf-tcpm-yang-tcp@ietf=
.org; tcpm IETF list 
Subject: RE: [tcpm] Request for feedback on WG adoption of draft-scharf-tcp=
m-yang-tcp-04

FWIW these are the publicly documented global stats in Windows TCP:
  union {
    DWORD             dwRtoAlgorithm;
    TCP_RTO_ALGORITHM RtoAlgorithm;
  };
  DWORD dwRtoMin;
  DWORD dwRtoMax;
  DWORD dwMaxConn;
  DWORD dwActiveOpens;
  DWORD dwPassiveOpens;
  DWORD dwAttemptFails;
  DWORD dwEstabResets;
  DWORD dwCurrEstab;
  DWORD dwInSegs;
  DWORD dwOutSegs;
  DWORD dwRetransSegs;
  DWORD dwInErrs;
  DWORD dwOutRsts;
  DWORD dwNumConns;

There are per connection stats too. Everything is based on MIB AFAIK. We ha=
ve had some new additions over time for the per connection stats. 32 bits i=
s now insufficient for InSegs and OutSegs and can and does overflow.

What are the implications of a YANG model to existing TCP implementations?

From: tcpm > On Behalf =
Of Scharf, Michael
Sent: Friday, March 27, 2020 8:52 AM
To: Joseph Touch >
Cc: Michael Tuexen >; d=
raft-scharf-tcpm-yang-tcp@ietf.org; tcpm IETF list >
Subject: [EXTERNAL] Re: [tcpm] Request for feedback on WG adoption of draft=
-scharf-tcpm-yang-tcp-04

Hi Joe,

Regarding stats, this is a YANG "feature" in draft -04. That explicitly spe=
cifies that a NETCONF server compliant to the YANG model does not have to p=
rovide the stats. We added this because of your past comment on that.

For the stats, -04 relatively closely follows the TCP-MIB (and the WG expli=
citly ask not to try a 1:1 mapping).

Given the pushback, here is a copy the current spec from -04:

    container statistics {
        if-feature statistics;
        config false;

        leaf active-opens {
          type yang:counter32;
          description
            "The number of times that TCP connections have made a direct
             transition to the SYN-SENT state from the CLOSED state..";
        }

        leaf passive-opens {
          type yang:counter32;
          description
            "The number of times TCP connections have made a direct
             transition to the SYN-RCVD state from the LISTEN state..";
        }

        leaf attempt-fails {
          type yang:counter32;
          description
            "The number of times that TCP connections have made a direct
             transition to the CLOSED state from either the SYN-SENT
             state or the SYN-RCVD state, plus the number of times that
             TCP connections have made a direct transition to the
             LISTEN state from the SYN-RCVD state.";
        }

        leaf establish-resets {
          type yang:counter32;
          description
            "The number of times that TCP connections have made a direct
             transition to the CLOSED state from either the ESTABLISHED
             state or the CLOSE-WAIT state.";
        }

        leaf currently-established {
          type yang:gauge32;
          description
            "The number of TCP connections for which the current state
             is either ESTABLISHED or CLOSE-WAIT.";
        }

        leaf in-segments {
          type yang:counter32;
          description
            "The total number of segments received, including those
             received in error.  This count includes segments received
             on currently established connections.";
        }

        leaf out-segments {
          type yang:counter32;
          description
            "The total number of segments sent, including those on
             current connections but excluding those containing only
             retransmitted octets.";
        }

        leaf retransmitted-segments {
          type yang:counter32;
          description
            "The total number of segments retransmitted; that is, the
             number of TCP segments transmitted containing one or more
             previously transmitted octets.";
        }

        leaf in-errors {
          type yang:counter32;
          description
            "The total number of segments received in error (e.g., bad
             TCP checksums).";
        }

        leaf out-resets {
          type yang:counter32;
          description
            "The number of TCP segments sent containing the RST flag.";
        }
...

I fully agree that we can discuss every single entry.. But, at least for th=
e stats, I don't think this is really a lot of work.. It is a fairly short =
list quite similar to the deployed TCP-MIB. The assumption here is that the=
 TCP-MIB is a reasonable baseline. Is it really hard to agree on a list of =
counters in TCPM and publish this?

In addition, there is one difference between a YANG model (and in fact also=
 a MIB) and a TCP API: The TCP API is tightly coupled with the TCP protocol=
 implementation typically in the kernel. Network management apps using YANG=
 can run outside the kernel. There are certain dependencies to configure an=
d to retrieve operational state. Nonetheless, the implementer of a YANG mod=
el may not be the implementer of a TCP stack. That may limit the burden to =
the latter.

Stats, TCP-AO and MD5 (with appropriate flagging) actually look like pretty=
 low-hanging fruits to me. Of course, we need to discuss the modeling detai=
ls,  but it is a fairly narrow and well-defined scope. Is this part really =
the most challenging part of the document that prevents us from adopting a =
YANG model in TCPM?

Michael


Von: Joseph Touch
Gesendet: Freitag, 27. M=E4rz 2020 16:03
An: Scharf, Michael
Cc: Lars Eggert; draft-scharf-tcpm-yang-tcp@ietf.or=
g; tcpm IETF list; Michael Tuexen
Betreff: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcp=
m-yang-tcp-04

Hi, all,

I agree with Lars that, in effect, encoding certain stats in the YANG model=
 runs the risk of making them "expected" in an implementation; if that's de=
sired, the process should be inverted (decide what we think is necessary TH=
EN add it; don't let the model drive the requirements).

That would be a LOT of work, equivalent to extending the API for TCP. If th=
at happens, we need to be VERY careful to not burden implementers with impl=
ementation details or requirements.

As to MD5, agreed that it's important to include, but I would even go so fa=
r as to put it under a subtree of "Deprecated" components to make it very c=
lear to everyone who uses them.

Joe


On Mar 27, 2020, at 7:49 AM, Scharf, Michael > wrote:

I am not an expert for SNMP under Linux. But, at first sight, /proc/net/snm=
p provides basically all scalars from the TCP-MIB. The connection table see=
ms missing. But those objects I would only expect when actually managing a =
Linux system by the SNMP protocol, not in the proc file system.

Search engines find quite a number of implementer questions on "/proc/net/s=
nmp". So, it seems relatively likely that there is some use. And in the are=
a of SNMP network management, there is often not much public documentation,=
 so a professor may not be able to figure out any details of deployed syste=
ms.

Regarding MD5, I get told that there is still running code and operational =
deployment, even if TCP-AO is getting traction. As users seem to ask for it=
, my proposal would be to add big warning signs that it is deprecated, i.e.=
, TCP-AO should be used instead. On that aspect, the other authors could ma=
ybe also chime in.

Michael


Von: Lars Eggert
Gesendet: Freitag, 27. M=E4rz 2020 15:15
An: Scharf, Michael
Cc: Michael Tuexen; tcpm IETF list; draft-scharf-tcpm-yang-tcp@ietf.org
Betreff: Re: [tcpm] Request for feedback on WG adoption of draft-scharf-tcp=
m-yang-tcp-04

Hi,

On 2020-3-27, at 15:52, Scharf, Michael > wrote:
> But, wait a second: I recommend to have a look at the output of "cat /pro=
c/net/snmp" under Linux (just tested on Debian Buster)...
>
> As far as I can see, these are the object definitions from the TCP-MIB.. =
If implemented on Linux, why does the TCP-MIB not matter?

/proc/net/snmp provides the scalars (a small subset of 4022), and obviously=
 just in text form. Are you aware of any uses?

> However, we have learnt from that: We have explicitly decided not to incl=
ude extended statistics in draft-scharf-tcpm-yang-tcp. The draft currently =
only includes basic stats.

Well, basic stats and AO detail. (And why still MD5? We obsoleted 2385 ten =
years ago.)

> It is well understood that there *are* challenges with coming up for a YA=
NG model for TCP. But if RFC 4898 got it wrong, we could learn from that, I=
MHO.

You are much more optimistic than I am.

Lars


_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm


--_000_6EC6417807D9754DA64F3087E2E2E03E2DA45864rznt8114rzntrzd_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable











Hi Praveen,


 


Thanks a lot for feedback!


 


The hint on counter overflow is excellent feedback. We =
should probably change at least the two counters to 64 bit in the next vers=
ion of the I-D. (And, while it seems obvious,
 I wasn’t aware of that. Aren’t these sort of details a good re=
ason to discuss the modeling in TCPM?)


 


Regarding the implications on existing TCP implementati=
ons:


 


I think the answer depends a lot on how the TCP impleme=
ntation is managed as of today. If a device is already managed by NETCONF, =
e.g., because it is a modern router or
 another network device (optical switch, access node, etc.), a YANG model f=
or TCP offers a standard way to configure the TCP stack on that device. Thi=
s could possibly replace, or complement, vendor-specific YANG models. That =
device could either implement the
 YANG model itself (e.g., stats when deprecating the TCP MIB), or only impo=
rt subsets of the model, e.g., certain definitions (say, the TCP-AO paramet=
ers if the device needs TCP-AO). The question whether to implement an IETF =
YANG model will be owned by the
 implementer and governed by the product roadmap, which is typically driven=
 by commercial customer demand.


 


For TCP stacks that are currently not managed by NETCON=
F, which most likely includes all main desktop and server PC operating syst=
ems, the YANG model probably has no immediate
 implications. For instance, I would be somewhat surprised if desktop and s=
erver operating systems would migrate from their existing management interf=
aces to NETCONF/YANG. Without the NETCONF (or RESTCONF) protocol, it is dif=
ficult to actually implement a YANG
 model completely. A more realistic future is that operating systems could =
perhaps follow the YANG model object naming and definitions within their ow=
n interfaces, e.g., to complement or replace entries taken from the old TCP=
 MIB. For instance, this could include
 the Linux /proc/ system or a new version of the Windows stats you have sho=
wn, at some point in future. As always, it would be up to the implementers =
to make their call whether to do so, and when. Also, as existing management=
 interfaces may not have equivalent
 to all YANG functionality, implementers may have to make some adoptions re=
garding syntax and semantics in any case. This is no different to what has =
happened to the TCP MIB in the past. For instance, an operating system coul=
d use for 64 bit counter variants
 definitions from a new YANG model, instead of the TCP MIB.


 


And there may be more use cases beyond these two cases.=
 This also depends on the scope of the YANG model, which is open for discus=
sion – stats are probably easier than
 configuration.


 


In any case, it is always up to implementers to decide =
whether to use YANG models, and, if so, to which extend. The management pla=
ne is much more heterogeneous than the
 data/control plane in IP networks. The IETF has published many YANG models=
 already, and many MIBs in the past. I think some MIBs some are more widely=
 implemented than others, and the same will most likely happen to IETF YANG=
 models, too.


 


Best regards


 


Michael


 


 








From: Praveen Balasubramanian <pravb@microsoft.com>


Sent: Friday, March 27, 2020 5:42 PM

To: Scharf, Michael <Michael.Scharf@hs-esslingen.de>; J=
oseph Touch <touch@strayalpha.com>

Cc: Michael Tuexen <tuexen@fh-muenster.de>; draft-scharf-tcpm-=
yang-tcp@ietf.org; tcpm IETF list <tcpm@ietf.org>

Subject: RE: [tcpm] Request for feedback on WG adoption of draft-sch=
arf-tcpm-yang-tcp-04






 


FWIW these are the publicly doc=
umented global stats in Windows TCP:


  union {


    DWORD   &=
nbsp;         dwRtoAlgorithm;<=
/o:p>


    TCP_RTO_ALGORITHM RtoAlg=
orithm;


  };


  DWORD dwRtoMin;

  DWORD dwRtoMax;

  DWORD dwMaxConn;

  DWORD dwActiveOpens;


  DWORD dwPassiveOpens;


  DWORD dwAttemptFails;


  DWORD dwEstabResets;


  DWORD dwCurrEstab;=



  DWORD dwInSegs;

  DWORD dwOutSegs;

  DWORD dwRetransSegs;


  DWORD dwInErrs;

  DWORD dwOutRsts;

  DWORD dwNumConns;<=
/p>

 


There are per connection stats =
too. Everything is based on MIB AFAIK. We have had some new additions over =
time for the per connection stats. 32 bits is now insufficient for InSegs a=
nd OutSegs and can and does overflow.


 


What are the implications of a =
YANG model to existing TCP implementations?



 






From: tcpm <tcpm-bounces@=
ietf.org>
On Behalf Of Scharf, Michael

Sent: Friday, March 27, 2020 8:52 AM

To: Joseph Touch <touch@s=
trayalpha.com>

Cc: Michael Tuexen <tuex=
en@fh-muenster.de>;
draft-scharf-tcpm-ya=
ng-tcp@ietf.org; tcpm IETF list <tc=
pm@ietf.org>

Subject: [EXTERNAL] Re: [tcpm] Request for feedback on WG adoption o=
f draft-scharf-tcpm-yang-tcp-04






 




Hi Joe,


 


Regarding stats, this is a YANG=
 „feature“ in draft -04. That explicitly specifies that a NETCO=
NF server compliant to the YANG model does not have to provide the stats. W=
e added this because of your past comment on that.


 


For the stats, -04 relatively c=
losely follows the TCP-MIB (and the WG explicitly ask not to try a 1:1 mapp=
ing).


 


Given the pushback, here is a c=
opy the current spec from -04:


 


    container st=
atistics {


     &=
nbsp;  if-feature statistics;


     &=
nbsp;  config false;


 


     &=
nbsp;  leaf active-opens {


     &=
nbsp;    type yang:counter32;


     &=
nbsp;    description


     &=
nbsp;      "The number of times that TCP conn=
ections have made a direct


     &=
nbsp;       transition to the SYN-SENT state =
from the CLOSED state..";


     &=
nbsp;  }


 


     &=
nbsp;  leaf passive-opens {


     &=
nbsp;    type yang:counter32;


     &=
nbsp;    description


     &=
nbsp;      "The number of times TCP connectio=
ns have made a direct


     &=
nbsp;       transition to the SYN-RCVD state =
from the LISTEN state..";


     &=
nbsp;  }


 


     &=
nbsp;  leaf attempt-fails {


     &=
nbsp;    type yang:counter32;


     &=
nbsp;    description


     &=
nbsp;      "The number of times that TCP conn=
ections have made a direct


     &=
nbsp;       transition to the CLOSED state fr=
om either the SYN-SENT


     &=
nbsp;       state or the SYN-RCVD state, plus=
 the number of times that


     &=
nbsp;       TCP connections have made a direc=
t transition to the


     &=
nbsp;       LISTEN state from the SYN-RCVD st=
ate.";


     &=
nbsp;  }


 


     &=
nbsp;  leaf establish-resets {


     &=
nbsp;    type yang:counter32;


     &=
nbsp;    description


     &=
nbsp;      "The number of times that TCP conn=
ections have made a direct


     &=
nbsp;       transition to the CLOSED state fr=
om either the ESTABLISHED


     &=
nbsp;       state or the CLOSE-WAIT state.&qu=
ot;;


     &=
nbsp;  }


 


     &=
nbsp;  leaf currently-established {


     &=
nbsp;    type yang:gauge32;


     &=
nbsp;    description


     &=
nbsp;      "The number of TCP connections for=
 which the current state


     &=
nbsp;       is either ESTABLISHED or CLOSE-WA=
IT.";


      =
  }


 


     &=
nbsp;  leaf in-segments {


     &=
nbsp;    type yang:counter32;


     &=
nbsp;    description


     &=
nbsp;      "The total number of segments rece=
ived, including those


     &=
nbsp;       received in error.  This cou=
nt includes segments received


     &=
nbsp;       on currently established connecti=
ons.";


     &=
nbsp;  }


 


     &=
nbsp;  leaf out-segments {


     &=
nbsp;    type yang:counter32;


     &=
nbsp;    description


     &=
nbsp;      "The total number of segments sent=
, including those on


     &=
nbsp;       current connections but excluding=
 those containing only


     &=
nbsp;       retransmitted octets.";=



     &=
nbsp;  }


 


     &=
nbsp;  leaf retransmitted-segments {


     &=
nbsp;    type yang:counter32;


     &=
nbsp;    description


     &=
nbsp;      "The total number of segments retr=
ansmitted; that is, the


     &=
nbsp;       number of TCP segments transmitte=
d containing one or more


     &=
nbsp;       previously transmitted octets.&qu=
ot;;


     &=
nbsp;  }


 


     &=
nbsp;  leaf in-errors {


     &=
nbsp;    type yang:counter32;


     &=
nbsp;    description


     &=
nbsp;      "The total number of segments rece=
ived in error (e.g., bad


     &=
nbsp;       TCP checksums).";=



     &=
nbsp;  }


 


     &=
nbsp;  leaf out-resets {


     &=
nbsp;    type yang:counter32;


     &=
nbsp;    description


     &=
nbsp;      "The number of TCP segments sent c=
ontaining the RST flag.";


     &=
nbsp;  }


…


 


I fully agree that we can discu=
ss every single entry.. But, at least for the stats, I don’t think th=
is is really a lot of work.. It is a fairly short list quite similar to the=
 deployed TCP-MIB. The assumption here is
 that the TCP-MIB is a reasonable baseline. Is it really hard to agree on a=
 list of counters in TCPM and publish this?


 


In addition, there is one diffe=
rence between a YANG model (and in fact also a MIB) and a TCP API: The TCP =
API is tightly coupled with the TCP protocol implementation typically in th=
e kernel. Network management apps using
 YANG can run outside the kernel. There are certain dependencies to configu=
re and to retrieve operational state. Nonetheless, the implementer of a YAN=
G model may not be the implementer of a TCP stack. That may limit the burde=
n to the latter.


 


Stats, TCP-AO and MD5 (with app=
ropriate flagging) actually look like pretty low-hanging fruits to me. Of c=
ourse, we need to discuss the modeling details,  but it is a fairly na=
rrow and well-defined scope. Is this part
 really the most challenging part of the document that prevents us from ado=
pting a YANG model in TCPM?


 


Michael


 


 




Von: Joseph Touch

Gesendet: Freitag, 27. M=E4rz 2020 16:03

An: Scharf, Michae=
l

Cc: Lars Eggert; 
draft-scharf-tcpm-yang-tcp@ietf.org; t=
cpm IETF list;
Michael Tuexen

Betreff: Re: [tcpm] Request for feedback on WG adoption of draft-sch=
arf-tcpm-yang-tcp-04




 






Hi, all, 




 






I agree with Lars that, in effe=
ct, encoding certain stats in the YANG model runs the risk of making them &=
#8220;expected” in an implementation; if that’s desired, the pr=
ocess should be inverted (decide what we think is necessary
 THEN add it; don’t let the model drive the requirements). =







 






That would be a LOT of work, eq=
uivalent to extending the API for TCP. If that happens, we need to be VERY =
careful to not burden implementers with implementation details or requireme=
nts.






 






As to MD5, agreed that it’=
;s important to include, but I would even go so far as to put it under a su=
btree of “Deprecated” components to make it very clear to every=
one who uses them.






 






Joe






 




=
 






On Mar 27, 2020, at 7:49 AM, Sc=
harf, Michael <Michael=
.Scharf@hs-esslingen.de> wrote:




 








I am not an expert for SNMP und=
er Linux. But, at first sight, /proc/net/snmp provides basically all scalar=
s from the TCP-MIB. The connection table seems missing. But those objects I=
 would only expect when actually managing
 a Linux system by the SNMP protocol, not in the proc file system.






 






Search engines find quite a num=
ber of implementer questions on „/proc/net/snmp“. So, it seems =
relatively likely that there is some use. And in the area of SNMP network m=
anagement, there is often not much public documentation,
 so a professor may not be able to figure out any details of deployed syste=
ms.






 






Regarding MD5, I get told that =
there is still running code and operational deployment, even if TCP-AO is g=
etting traction. As users seem to ask for it, my proposal would be to add b=
ig warning signs that it is deprecated,
 i.e., TCP-AO should be used instead. On that aspect, the other authors cou=
ld maybe also chime in.






 






Michael






 






 








Von: Lars Eggert

Gesendet: Freitag,=
 27. M=E4rz 2020 15:15

An: Scharf, Michael

Cc: Michael Tuexen; tcpm IETF list;<=
span class=3D"apple-converted-space"> draft-scharf-tcpm-yang-tcp@ietf.org

Betreff: Re: [tcpm=
] Request for feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04=









 






Hi,






 






On 2020-3-27, at 15:52, Scharf,=
 Michael <Michael.Scha=
rf@hs-esslingen.de> wrote:






> But, wait a second: I reco=
mmend to have a look at the output of „cat /proc/net/snmp“ unde=
r Linux (just tested on Debian Buster)…






> 





> As far as I can see, these=
 are the object definitions from the TCP-MIB.. If implemented on Linux, why=
 does the TCP-MIB not matter?






 






/proc/net/snmp provides the sca=
lars (a small subset of 4022), and obviously just in text form. Are you awa=
re of any uses?






 






> However, we have learnt fr=
om that: We have explicitly decided not to include extended statistics in d=
raft-scharf-tcpm-yang-tcp. The draft currently only includes basic stats.






 






Well, basic stats and AO detail=
. (And why still MD5? We obsoleted 2385 ten years ago.)





 






> It is well understood that=
 there *are* challenges with coming up for a YANG model for TCP. But if RFC=
 4898 got it wrong, we could learn from that, IMHO.






 






You are much more optimistic th=
an I am.






 






Lars






 






 






___________________________________=
____________

tcpm mailing list

tcpm@ietf.or=
g

https=
://www.ietf.org/mailman/listinfo/tcpm








 












--_000_6EC6417807D9754DA64F3087E2E2E03E2DA45864rznt8114rzntrzd_--


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Hi Michael,

My intent was to suggest using the roadmap as a way to =E2=80=9Ccheck=E2=80=
=9D whether items you want to add should be required, optional, or not =
needed.

It=E2=80=99s not to drive the model to cover EVERYTHING in the roadmap, =
though if there=E2=80=99s a key area that=E2=80=99s required and isn=E2=80=
=99t covered, it signals a gap.

It IS to avoid having implementations be the sole driver of the model. =
Just because something IS measured or controllable doesn=E2=80=99t mean =
it should be in the model.

Joe

> On Mar 30, 2020, at 4:52 AM, Scharf, Michael =
 wrote:
>=20
> Hi Joe,
> =20
> In the YANG model, the statement =E2=80=9Cif-feature statistics;=E2=80=9C=
 explicitly specifies that an implementation only has to support that if =
it supports the =E2=80=9Cfeature=E2=80=9D statistics of the model, for =
instance, if it announces that support (e.g., during the NETCONF =
handshake). It is entirely up to the implementer whether to support a =
given feature or not. This is just using the tools from the YANG =
language.
> =20
> In addition, keep in mind that objects in a YANG model are optional by =
default. A node in the tree must only be present if the keyword =
=E2=80=9Cmandatory true=E2=80=9D is specified in YANG. We don=E2=80=99t =
use this keyword in the model. So, for somebody who reads the YANG =
model, IMHO it should be more than clear that the model is optional.
> =20
> We have discussed quite a bit how to address your past comment and =
this seems the most obvious approach to somebody who is familiar with =
YANG.
> =20
> As a side note, we can see here that this is about details of the YANG =
language. One of the challenges with this doc is that one may need both =
some TCP and some YANG expertise to understand some of the details. =
Probably only very few people deal with both topics at the same time. =
For example, I am not a real YANG expert myself. But, well, I am not the =
only author of the I-D... The idea of the I-D is to bring together the =
needed expertise among the authors. (And there would still be room for =
more co-authors.) Also, for the TCPM working group probably some of the =
YANG details are less interesting. More relevant is probably how TCP =
configuration and stats are modelled, e.g., what parameters are used, =
what values parameters can take, how the parameters are described =
precisely, etc. And I think we have *a lot* of expertise on that in =
TCPM.
> =20
> I am not sure how the TCP roadmap helps us with the YANG model, tough. =
It is unrealistic to model in YANG everything that the IETF has written =
on TCP so far. To make a trivial example: We don=E2=80=99t need a YANG =
model for Quick-Start TCP ;-) This is why the I-D takes the opposite =
approach: The focus is on configuration attributes and stats that exist =
on (several) existing TCP implementations. So, basically the proposal is =
to only model attributes that exist (in somewhat similar from) on =
several TCP stacks, i.e., it can be configured already, albeit not =
necessarily by YANG. This set of attributes mostly corresponds to what =
follows from the standards-track TCP specification, albeit of course the =
devil is in the details. In any case, to me it doesn=E2=80=99t make a =
lot of sense to model something in a YANG model that a corresponding =
NETCONF server implementation cannot implement because no relevant TCP =
stack supports it.
> =20
> Thanks
> =20
> Michael
> =20
> =20
> From: Joseph Touch >=20
> Sent: Friday, March 27, 2020 5:49 PM
> To: Scharf, Michael n.de =
>
> Cc: Lars Eggert >; =
draft-scharf-tcpm-yang-tcp@ietf.org =
; tcpm IETF list =
>; Michael Tuexen =
>
> Subject: Re: [tcpm] Request for feedback on WG adoption of =
draft-scharf-tcpm-yang-tcp-04
> =20
> =20
>=20
>=20
> On Mar 27, 2020, at 8:51 AM, Scharf, Michael =
> =
wrote:
> =20
> Hi Joe,
> =20
> Regarding stats, this is a YANG =E2=80=9Efeature=E2=80=9C in draft =
-04. That explicitly specifies that a NETCONF server compliant to the =
YANG model does not have to provide the stats. We added this because of =
your past comment on that.
> =20
> AOK, but is that clear in the model itself? I.e., is there a way that =
merely using that subtree of data forces the user to realize that it=E2=80=
=99s explicitly optional?
>=20
>=20
> For the stats, -04 relatively closely follows the TCP-MIB (and the WG =
explicitly ask not to try a 1:1 mapping).
> =20
> AOK.
> =20
> ...
> I fully agree that we can discuss every single entry. But, at least =
for the stats, I don=E2=80=99t think this is really a lot of work.
> =20
> Agreed; this isn=E2=80=99t onerous esp. if optional.
>=20
>=20
> In addition, there is one difference between a YANG model (and in fact =
also a MIB) and a TCP API: The TCP API is tightly coupled with the TCP =
protocol implementation typically in the kernel. Network management apps =
using YANG can run outside the kernel.=20
> =20
> In-kernel or out-of-kernel are implementation decisions. Neither is =
driven by MIB vs YANG or even the TCP API (or TCP) itself, agreed.
> =20
> My point is that we need to be careful to not make this model an =
explicit or implicit extension of the API. The optional part above =
should do that.
>=20
>=20
> ...
> Stats, TCP-AO and MD5 (with appropriate flagging) actually look like =
pretty low-hanging fruits to me. Of course, we need to discuss the =
modeling details,  but it is a fairly narrow and well-defined scope. Is =
this part really the most challenging part of the document that prevents =
us from adopting a YANG model in TCPM?
> =20
> The TCP roadmap should help us understand what=E2=80=99s critical and =
not in this model, IMO.
> =20
> Joe
> =20
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org 
> https://www.ietf.org/mailman/listinfo/tcpm =


--Apple-Mail=_A7BF3945-975A-472C-BBC5-575A5DC06FAD
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

Hi =
Michael,

My intent =
was to suggest using the roadmap as a way to =E2=80=9Ccheck=E2=80=9D =
whether items you want to add should be required, optional, or not =
needed.

It=E2=80=
=99s not to drive the model to cover EVERYTHING in the roadmap, though =
if there=E2=80=99s a key area that=E2=80=99s required and isn=E2=80=99t =
covered, it signals a gap.

It IS to avoid having implementations be the sole driver of =
the model. Just because something IS measured or controllable doesn=E2=80=99=
t mean it should be in the model.

Joe

On Mar =
30, 2020, at 4:52 AM, Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:

Hi Joe,
 
In =
the YANG model, the statement =E2=80=9Cif-feature statistics;=E2=80=9C =
explicitly specifies that an implementation only has to support that if =
it supports the =E2=80=9Cfeature=E2=80=9D statistics of the model, for =
instance, if it announces that support (e.g., during the NETCONF =
handshake). It is entirely up to the implementer whether to support a =
given feature or not. This is just using the tools from the YANG =
language.
 
In addition, keep in mind that objects in a YANG model are =
optional by default. A node in the tree must only be present if the =
keyword =E2=80=9Cmandatory true=E2=80=9D is specified in YANG. We =
don=E2=80=99t use this keyword in the model. So, for somebody who reads =
the YANG model, IMHO it should be more than clear that the model is =
optional.
 
We have discussed quite a bit how to address your past =
comment and this seems the most obvious approach to somebody who is =
familiar with YANG.
 
As =
a side note, we can see here that this is about details of the YANG =
language. One of the challenges with this doc is that one may need both =
some TCP and some YANG expertise to understand some of the details. =
Probably only very few people deal with both topics at the same time. =
For example, I am not a real YANG expert myself. But, well, I am not the =
only author of the I-D... The idea of the I-D is to bring together the =
needed expertise among the authors. (And there would still be room for =
more co-authors.) Also, for the TCPM working group probably some of the =
YANG details are less interesting. More relevant is probably how TCP =
configuration and stats are modelled, e.g., what parameters are used, =
what values parameters can take, how the parameters are described =
precisely, etc. And I think we have *a lot* of =
expertise on that in TCPM.
 
I =
am not sure how the TCP roadmap helps us with the YANG model, tough. It =
is unrealistic to model in YANG everything that the IETF has written on =
TCP so far. To make a trivial example: We don=E2=80=99t need a YANG =
model for Quick-Start TCP ;-) This is why the I-D takes the opposite =
approach: The focus is on configuration attributes and stats that exist =
on (several) existing TCP implementations. So, basically the proposal is =
to only model attributes that exist (in somewhat similar from) on =
several TCP stacks, i.e., it can be configured already, albeit not =
necessarily by YANG. This set of attributes mostly corresponds to what =
follows from the standards-track TCP specification, albeit of course the =
devil is in the details. In any case, to me it doesn=E2=80=99t make a =
lot of sense to model something in a YANG model that a corresponding =
NETCONF server implementation cannot implement because no relevant TCP =
stack supports it.
 
Thanks
 
Michael
 
 
From: Joseph Touch <touch@strayalpha.com> 
Sent: Friday, March 27, 2020 5:49 =
PM
To: Scharf, Michael <Michael.Scharf@hs-esslingen.de>
Cc: Lars =
Eggert <lars@eggert.org>; draft-scharf-tcpm-yang-tcp@ietf.org; tcpm IETF list =
<tcpm@ietf.org>; Michael =
Tuexen <tuexen@fh-muenster.de>
Subject: Re: [tcpm] Request for =
feedback on WG adoption of draft-scharf-tcpm-yang-tcp-04
 
 


On Mar 27, =
2020, at 8:51 AM, Scharf, Michael <Michael.Scharf@hs-esslingen.de> wrote:
 
Hi Joe,
 
Regarding stats, this is a YANG =E2=80=9Efeature=E2=80=9C in =
draft -04. That explicitly specifies that a NETCONF server compliant to =
the YANG model does not have to provide the stats. We added this because =
of your past comment on that.
 
AOK, but is that clear in the model =
itself? I.e., is there a way that merely using that subtree of data =
forces the user to realize that it=E2=80=99s explicitly optional?


For the stats, -04 =
relatively closely follows the TCP-MIB (and the WG explicitly ask not to =
try a 1:1 mapping).
 
AOK.
 
...
I fully agree that =
we can discuss every single entry. But, at least for the stats, I =
don=E2=80=99t think this is really a lot of work.
 
Agreed; this isn=E2=80=99t onerous esp. =
if optional.


In addition, there is one =
difference between a YANG model (and in fact also a MIB) and a TCP API: =
The TCP API is tightly coupled with the TCP protocol implementation =
typically in the kernel. Network management apps using YANG can run =
outside the kernel. 
 
In-kernel or out-of-kernel are =
implementation decisions. Neither is driven by MIB vs YANG or even the =
TCP API (or TCP) itself, agreed.
 
My point is that we need to be careful =
to not make this model an explicit or implicit extension of the API. The =
optional part above should do that.


...
Stats, TCP-AO and MD5 (with appropriate =
flagging) actually look like pretty low-hanging fruits to me. Of course, =
we need to discuss the modeling details,  but it is a fairly narrow =
and well-defined scope. Is this part really the most challenging part of =
the document that prevents us from adopting a YANG model in TCPM?
 
The TCP roadmap should help us =
understand what=E2=80=99s critical and not in this model, IMO.
 
Joe
 
_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

=

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Dear all,

just a quick reminder:

We are currently running a WGLC for TCP RACK until Tuesday, April 7th 2020.

Please send any comments, including indications to support this document,
to the TCMP mailing list by then.

The ID is available at
https://tools.ietf.org/html/draft-ietf-tcpm-rack-08

Best regards
Michael



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Subject: Re: [tcpm] Sender control of Delayed ACKs (was Re: More motivating scenarios for tcpm-ack-pull)
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Rahul,

On 30/03/2020 10:33, Rahul Arvind Jadhav wrote:
>
> Hello Bob,
>
> Thanks for the pointer.
>
>
> [BB]
>                 Examples of technologies where deployments have
>                 been reported to do ACK thinning include satellite 
> links, DOCSIS
>                 cable networks, mobile cellular networks, among others.
>
> For DOCSIS at least I know that it's not just a case of "deployments 
> have been reported". TCP ACK thinning is in the DOCSIS spec [DOCSIS3.1].
>
> [RJ] I couldn’t find any refs towards TCP ACK thinning in the 
> mentioned DOCSIS spec. Not sure if I am missing something? The only 
> sentence I found, “The CM SHOULD support a mechanism by which TCP ACK 
> frames are prioritized or filtered in order to increase TCP session 
> throughput” in section 9.1.2.3.2 but not sure if this is what you were 
> referring?
>
> I am interested in understanding more about what DOCSIS attempts  in 
> the context of ACK thinning. Any details are appreciated.
>
> Thanks in advance.
>

[BB] That's the sentence I meant.

I'm trying to find out what actual practice is with different 
implementations (initially by asking, but ultimately this can be measured).


Bob

> - Rahul
>

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/


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    Rahul,

    

    
On 30/03/2020 10:33, Rahul Arvind
      Jadhav wrote:

    

    

      
      
      
      

        
Hello
            Bob,

        
Thanks
            for the pointer.

        


          [BB] 

                          Examples of
              technologies where deployments have   
            

                            been reported to do ACK thinning include
              satellite links, DOCSIS   
            

                            cable networks, mobile cellular
              networks, among others.

          

          For DOCSIS at least I know that it's not just a case of
          "deployments have been reported". TCP ACK thinning is in the
          DOCSIS spec [DOCSIS3.1].
          

          

          [RJ] I
            couldn’t find any refs towards TCP ACK thinning in the
            mentioned DOCSIS spec. Not sure if I am missing something?
            The only sentence I found, “The CM SHOULD support a
            mechanism by which TCP ACK frames are prioritized or
            filtered in order to increase TCP session throughput” in
            section 9.1.2.3.2 but not sure if this is what you were
            referring?

        
I
            am interested in understanding more about what DOCSIS
            attempts  in the context of ACK thinning. Any details are
            appreciated.

        
Thanks
            in advance.

      

    

    

    [BB] That's the sentence I meant.

    

    I'm trying to find out what actual practice is with different
    implementations (initially by asking, but ultimately this can be
    measured).

    

    

    Bob

    

    

      

        

        
 

        
-
            Rahul
            

      

    

    

    
-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/

  


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Date: Tue, 31 Mar 2020 13:44:04 +0300
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Subject: [tcpm] Test vectors for RFC5925 algorithms?
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Hello,

I have been searching for test vectors for RFC5925/5926 algorithms for
TCP AO and to my surprise it seems that such do not exist. Am I
correct here?

Even though test vectors for HMAC SHA1 (RFC2202) and AES CMAC
(RFC4493) are available, it would be useful to have example test
vectors for frames using TCP AO - otherwise implementations end up
easily not to match. As RFC5925 is 47 pages, there is a room for error
and only one mismatch is needed for MACs not to match.

I think publishing a new RFC for them would be good, but probably
takes some time. Even unofficial, but verified, test vectors on some
specified example frames (with and without TCP options), e.g. on this
mailing list or otherwise, would be a very good start to get TCP AO
more widely implemented. If such already are available somewhere,
please do let me know.

Thanks,
--
 Juhamatti


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Subject: Re: [tcpm] Test vectors for RFC5925 algorithms?
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Hi, Juhamatti,

At best, those might be an addendum to RFC 5926. RFC 5925 deliberately =
does not specify any algorithms.

However, TCP MD5 was widely deployed without any such test vectors in =
the RFC series (or elsewhere I could find, FWIW).

Joe

> On Mar 31, 2020, at 3:44 AM, juhamatk@gmail.com wrote:
>=20
> Hello,
>=20
> I have been searching for test vectors for RFC5925/5926 algorithms for
> TCP AO and to my surprise it seems that such do not exist. Am I
> correct here?
>=20
> Even though test vectors for HMAC SHA1 (RFC2202) and AES CMAC
> (RFC4493) are available, it would be useful to have example test
> vectors for frames using TCP AO - otherwise implementations end up
> easily not to match. As RFC5925 is 47 pages, there is a room for error
> and only one mismatch is needed for MACs not to match.
>=20
> I think publishing a new RFC for them would be good, but probably
> takes some time. Even unofficial, but verified, test vectors on some
> specified example frames (with and without TCP options), e.g. on this
> mailing list or otherwise, would be a very good start to get TCP AO
> more widely implemented. If such already are available somewhere,
> please do let me know.
>=20
> Thanks,
> --
> Juhamatti
>=20
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpm