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Updating TCP to Support Rate-Limited Traffic (RFC7661)

IP.com Disclosure Number: IPCOM000245003D
Original Publication Date: 2015-Oct-01
Included in the Prior Art Database: 2016-Feb-05
Document File: 42 page(s) / 51K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Fairhurst: AUTHOR [+3]


TCP is used for traffic with a range of application behaviours. The TCP congestion window (cwnd) controls the maximum number of unacknowledged packets/bytes that a TCP flow may have in the network at any time, a value known as the FlightSize [RFC5681]. FlightSize is a measure of the volume of data that is unacknowledged at a specific time. A bulk application will always have data available to transmit. The rate at which it sends is therefore limited by the maximum permitted by the receiver advertised window and the sender congestion window (cwnd). The FlightSize of a bulk flow increases with the cwnd and tracks the volume of data acknowledged in the last Round-Trip Time (RTT).

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Internet Engineering Task Force (IETF)                      G. Fairhurst Request for Comments: 7661                               A. Sathiaseelan Obsoletes: 2861                                                R. Secchi Category: Experimental                            University of Aberdeen ISSN: 2070-1721                                             October 2015

               Updating TCP to Support Rate-Limited Traffic


   This document provides a mechanism to address issues that arise when    TCP is used for traffic that exhibits periods where the sending rate    is limited by the application rather than the congestion window.  It    provides an experimental update to TCP that allows a TCP sender to    restart quickly following a rate-limited interval.  This method is    expected to benefit applications that send rate-limited traffic using    TCP while also providing an appropriate response if congestion is    experienced.

   This document also evaluates the Experimental specification of TCP    Congestion Window Validation (CWV) defined in RFC 2861 and concludes    that RFC 2861 sought to address important issues but failed to    deliver a widely used solution.  This document therefore reclassifies    the status of RFC 2861 from Experimental to Historic.  This document    obsoletes RFC 2861.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for examination, experimental implementation, and    evaluation.

   This document defines an Experimental Protocol for the Internet    community.  This document is a product of the Internet Engineering    Task Force (IETF).  It represents the consensus of the IETF    community.  It has received public review and has been approved for    publication by the Internet Engineering Steering Group (IESG).  Not    all documents approved by the IESG are a candidate for any level of    Internet Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc7661.

Fairhurst, et al.             Experimental                      [Page 1]
 RFC 7661                         New CWV                    October 2015

 Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    (http://trustee.ietf.org/license-info) in effect on the date of    publication of this document.  Please review these docum...