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RFC 9438: CUBIC for Fast and Long-Distance Networks

In plain English — editorial summary, not part of the RFC

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, this document also moves the specification to the Standards Track and obsoletes RFC 8312. This document also updates RFC 5681, to allow for CUBIC's occasionally more aggressive sending behavior.

Document record

Document ID
RFC9438
Published
August 2023
Authors
L. Xu; S. Ha; I. Rhee; V. Goel; L. Eggert
Status
PROPOSED STANDARD
Stream
IETF
Area
wit
Pages
28
Also known as
—
Obsoletes:
RFC 8312
Updates:
RFC 5681

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The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

Last checked against the RFC Editor index on . RFCs are never revised after publication; changes are issued as new documents.

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canonical URL: /rfc/9438-cubic-for-fast-and-long-distance-networks