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CUBIC for Fast and Long-Distance Networks

Document Type Replaced Internet-Draft (individual)
Expired & archived
Authors Lisong Xu , Sangtae Ha , Injong Rhee , Vidhi Goel , Lars Eggert
Last updated 2021-03-11
Replaced by draft-ietf-tcpm-rfc8312bis
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-tcpm-rfc8312bis
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


CUBIC is an extension to the traditional TCP standards. It differs from the traditional TCP standards only in the congestion control algorithm on the sender side. In particular, it uses a cubic function instead of the linear window increase function of the traditional TCP standards to improve scalability and stability under 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 [RFC8312].


Lisong Xu
Sangtae Ha
Injong Rhee
Vidhi Goel
Lars Eggert

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)