Re: [tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-14.txt
Bob Briscoe <in@bobbriscoe.net> Thu, 04 March 2021 13:24 UTC
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From: Bob Briscoe <in@bobbriscoe.net>
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Date: Thu, 04 Mar 2021 13:24:09 +0000
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Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-14.txt
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tcpm, We posted rev -14 of this draft last Monday. Here's a summary of the diffs, with the subject line of the relevant ML thread and main people contributing (for which, as always, many thanks): * ["Possible error in accurate-ecn" Yoshi - discussion ongoing with co-authors] In the 2 rules for when CE marks trigger an ACK (S.3.2.2.5.1.): o count CE-marks on all types of packet (not just data packets), but still only trigger an ACK with a CE-marked data packet o 'n' CE marks still trigger and ACK, but limited choice of 'n' between 2-6, not 1-6 * ["AccECN field order" Michael Scharf] Clarified that remaining bytes in the AccECN TCP Option (S.3.2.3) should be treated as if padding Noted potential covert channel in Security Considerations. * ["AccECN field order" Michael Scharf, Neal, Joe, Vidhi, Lars] No change (S.3.2.3): Left the two field orders of the AccECN TCP Option keyed on two option kinds. Rationale: Always need to be frugal even if option codes are not currently scarce, but simplicity is also important. * ["Coming back to my comments on AccECN wrt ACK Filtering" Gorry] Clarified ACK filtering text (S.3.3.3) and corrected summary of RFC3449. Bob On 22/02/2021 23:53, 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 : More Accurate ECN Feedback in TCP > Authors : Bob Briscoe > Mirja Kühlewind > Richard Scheffenegger > Filename : draft-ietf-tcpm-accurate-ecn-14.txt > Pages : 59 > Date : 2021-02-22 > > 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-14 > https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn-14 > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-14 > > > 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 -- ________________________________________________________________ Bob Briscoehttp://bobbriscoe.net/
- [tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-1… internet-drafts
- Re: [tcpm] I-D Action: draft-ietf-tcpm-accurate-e… Bob Briscoe