The IESG has approved the following document:
- 'CUBIC for Fast and Long-Distance Networks'
  (draft-ietf-tcpm-rfc8312bis-15.txt) as Proposed Standard

This document is the product of the TCP Maintenance and Minor Extensions
Working Group.

The IESG contact persons are Zaheduzzaman Sarker and Martin Duke.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc8312bis/





Technical Summary

CUBIC is a standard TCP congestion control algorithm that uses a cubic function 
instead of a linear congestion window increase function to improve scalability 
and stability over fast and long-distance networks. CUBIC has been adopted as 
the default TCP congestion control algorithm by the Linux, Windows, and Apple 
stacks.

This document updates the specification of CUBIC to include algorithmic 
improvements based on these implementations and recent academic work. Based on 
the extensive deployment experience with CUBIC, it also moves the specification 
to the Standards Track, obsoleting RFC 8312. This also requires updating RFC 
5681, to allow for CUBIC's occasionally more aggressive sending behavior.

Working Group Summary

Although there was a broad consensus in the WG, it was not unanimous. 
Dissenters argued that the process in RFC5033 was not rigorously observed,
and that strictly speaking, Cubic may not be fair to Reno as required in that 
document.

There was rough consensus to publish anyway, as (1) Cubic is widely deployed as 
a de facto standard, (2) broadly speaking, Reno continues to function 
effectively despite widespread Cubic deployment and analytical results that 
suggest unfairness, and (3) many were satisfied by the document's attempt to 
comply with RFC5033.

Document Quality

All major OSes support Cubic. It is the default for Linux and Windows.

Personnel

The document shepherd is Yoshifumi Nishida. The Responsible AD is Martin Duke.


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