[tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-26.txt

[[e-mail]]

A New Internet-Draft is available from the on-line Internet-Drafts
directories. This Internet-Draft 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
   Filename        : draft-ietf-tcpm-accurate-ecn-26.txt
   Pages           : 70
   Date            : 2023-07-24

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-26

A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-ietf-tcpm-accurate-ecn-26

Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts