TCP Extensions for High Performance
RFC 7323
Document | Type |
RFC - Proposed Standard
(September 2014; Errata)
Obsoletes RFC 1323
|
|
---|---|---|---|
Authors | David Borman , Robert Braden , Van Jacobson , Richard Scheffenegger | ||
Last updated | 2018-12-29 | ||
Replaces | draft-borman-1323bis | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Pasi Sarolahti | ||
Shepherd write-up | Show (last changed 2013-12-15) | ||
IESG | IESG state | RFC 7323 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Martin Stiemerling | ||
Send notices to | (None) | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | RFC-Ed-Ack |
Internet Engineering Task Force (IETF) D. Borman Request for Comments: 7323 Quantum Corporation Obsoletes: 1323 B. Braden Category: Standards Track University of Southern California ISSN: 2070-1721 V. Jacobson Google, Inc. R. Scheffenegger, Ed. NetApp, Inc. September 2014 TCP Extensions for High Performance Abstract This document specifies a set of TCP extensions to improve performance over paths with a large bandwidth * delay product and to provide reliable operation over very high-speed paths. It defines the TCP Window Scale (WS) option and the TCP Timestamps (TS) option and their semantics. The Window Scale option is used to support larger receive windows, while the Timestamps option can be used for at least two distinct mechanisms, Protection Against Wrapped Sequences (PAWS) and Round-Trip Time Measurement (RTTM), that are also described herein. This document obsoletes RFC 1323 and describes changes from it. Status of This Memo This is an Internet Standards Track document. 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). Further information on Internet Standards is available in 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/rfc7323. Borman, et al. Standards Track [Page 1] RFC 7323 TCP Extensions for High Performance September 2014 Copyright Notice Copyright (c) 2014 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 documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Borman, et al. Standards Track [Page 2] RFC 7323 TCP Extensions for High Performance September 2014 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1. TCP Performance . . . . . . . . . . . . . . . . . . . . . 4 1.2. TCP Reliability . . . . . . . . . . . . . . . . . . . . . 5 1.3. Using TCP options . . . . . . . . . . . . . . . . . . . . 6 1.4. Terminology . . . . . . . . . . . . . . . . . . . . . . . 7 2. TCP Window Scale Option . . . . . . . . . . . . . . . . . . . 8 2.1. Introduction . . . . . . . . . . . . . . . . . . . . . . 8 2.2. Window Scale Option . . . . . . . . . . . . . . . . . . . 8 2.3. Using the Window Scale Option . . . . . . . . . . . . . . 9 2.4. Addressing Window Retraction . . . . . . . . . . . . . . 10 3. TCP Timestamps Option . . . . . . . . . . . . . . . . . . . . 11 3.1. Introduction . . . . . . . . . . . . . . . . . . . . . . 11 3.2. Timestamps Option . . . . . . . . . . . . . . . . . . . . 12 4. The RTTM Mechanism . . . . . . . . . . . . . . . . . . . . . 14 4.1. Introduction . . . . . . . . . . . . . . . . . . . . . . 14 4.2. Updating the RTO Value . . . . . . . . . . . . . . . . . 15 4.3. Which Timestamp to Echo . . . . . . . . . . . . . . . . . 16 5. PAWS - Protection Against Wrapped Sequences . . . . . . . . . 19 5.1. Introduction . . . . . . . . . . . . . . . . . . . . . . 19 5.2. The PAWS Mechanism . . . . . . . . . . . . . . . . . . . 19 5.3. Basic PAWS Algorithm . . . . . . . . . . . . . . . . . . 20 5.4. Timestamp Clock . . . . . . . . . . . . . . . . . . . . . 22 5.5. Outdated Timestamps . . . . . . . . . . . . . . . . . . . 24 5.6. Header Prediction . . . . . . . . . . . . . . . . . . . . 25 5.7. IP Fragmentation . . . . . . . . . . . . . . . . . . . . 26 5.8. Duplicates from Earlier Incarnations of Connection . . . 26 6. Conclusions and Acknowledgments . . . . . . . . . . . . . . . 27 7. Security Considerations . . . . . . . . . . . . . . . . . . . 27Show full document text