[tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-20.txt
internet-drafts@ietf.org Mon, 25 July 2022 14:21 UTC
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Date: Mon, 25 Jul 2022 07:21:46 -0700
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Subject: [tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-20.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 : More Accurate ECN Feedback in TCP Authors : Bob Briscoe Mirja Kühlewind Richard Scheffenegger Filename : draft-ietf-tcpm-accurate-ecn-20.txt Pages : 61 Date : 2022-07-25 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 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 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 to specify 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 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 a new TCP option, which is 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 draft is: https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/ There is also an HTML version available at: https://www.ietf.org/archive/id/draft-ietf-tcpm-accurate-ecn-20.html A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-20 Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts
- [tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-2… internet-drafts
- [tcpm] New AccECN version: draft-ietf-tcpm-accura… Bob Briscoe
- [tcpm] AccECN: summary text about omitting unchan… Neal Cardwell
- Re: [tcpm] AccECN: summary text about omitting un… Scheffenegger, Richard
- Re: [tcpm] AccECN: summary text about omitting un… Joe Touch
- Re: [tcpm] AccECN: summary text about omitting un… Scheffenegger, Richard