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Re: [tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-27.txt

Bob Briscoe <in@bobbriscoe.net> Mon, 06 November 2023 23:26 UTC

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Date: Mon, 06 Nov 2023 23:26:41 +0000
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To: tcpm@ietf.org, Martin Duke <martin.h.duke@gmail.com>, Michael Tuexen <tuexen@fh-muenster.de>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tcpm/vFoYuiYWQ13lpDf3-anwXaqHVyQ>
Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-27.txt
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tcpm, Michael (as doc shep), Martin (as resp AD),

Ive just posted a new rev of the AccECN draft with 2 or 3 editorial nits 
fixed. Here's the diff:
https://author-tools.ietf.org/iddiff?url1=draft-ietf-tcpm-accurate-ecn-26&url2=draft-ietf-tcpm-accurate-ecn-27&difftype=--html


Bob

On 06/11/2023 23:20, internet-drafts@ietf.org wrote:
> Internet-Draft draft-ietf-tcpm-accurate-ecn-27.txt is now available. It is a
> work item of the TCP Maintenance and Minor Extensions (TCPM) WG of the IETF.
>
>     Title:   More Accurate Explicit Congestion Notification (ECN) Feedback in TCP
>     Authors: Bob Briscoe
>              Mirja Kühlewind
>              Richard Scheffenegger
>     Name:    draft-ietf-tcpm-accurate-ecn-27.txt
>     Pages:   71
>     Dates:   2023-11-06
>
> 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 endpoints.  Receivers with an ECN-capable
>     transport protocol feed back this information to the sender.  ECN was
>     originally 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, and Scalable Throughput (L4S) need more
>     accurate ECN feedback information whenever more than one marking is
>     received in one RTT.  This document updates the original ECN
>     specification in RFC 3168 to specify a scheme that provides more than
>     one feedback signal per RTT in the TCP header.  Given TCP header
>     space is scarce, it allocates a reserved header bit previously
>     assigned to the ECN-Nonce.  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 two new TCP option alternatives, which are never used on the TCP
>     SYN.  The document also specifies the treatment of this updated TCP
>     wire protocol by middleboxes.
>
> The IETF datatracker status page for this Internet-Draft is:
> https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/
>
> There is also an HTMLized version available at:
> https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn-27
>
> A diff from the previous version is available at:
> https://author-tools.ietf.org/iddiff?url2=draft-ietf-tcpm-accurate-ecn-27
>
> Internet-Drafts are also available by rsync at:
> rsync.ietf.org::internet-drafts
>
>
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpm

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

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