Browse Prior Art Database

TCP Extensions for High Performance (RFC1323)

IP.com Disclosure Number: IPCOM000002145D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2019-Feb-10
Document File: 37 page(s) / 52K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

V. Jacobson: AUTHOR [+2]

Related Documents

10.17487/RFC1323: DOI

Abstract

This memo presents a set of TCP extensions to improve performance over large bandwidth*delay product paths and to provide reliable operation over very high-speed paths. It defines new TCP options for scaled windows and timestamps, which are designed to provide compatible interworking with TCP's that do not implement the extensions. [STANDARDS-TRACK]

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 5% of the total text.

Network Working Group V. Jacobson Request for Comments: 1323 LBL Obsoletes: RFC 1072, RFC 1185 R. Braden ISI D. Borman Cray Research May 1992

TCP Extensions for High Performance

Status of This Memo

This RFC specifies an IAB standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "IAB Official Protocol Standards" for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Abstract

This memo presents a set of TCP extensions to improve performance over large bandwidth*delay product paths and to provide reliable operation over very high-speed paths. It defines new TCP options for scaled windows and timestamps, which are designed to provide compatible interworking with TCP’s that do not implement the extensions. The timestamps are used for two distinct mechanisms: RTTM (Round Trip Time Measurement) and PAWS (Protect Against Wrapped Sequences). Selective acknowledgments are not included in this memo.

This memo combines and supersedes RFC-1072 and RFC-1185, adding additional clarification and more detailed specification. Appendix C summarizes the changes from the earlier RFCs.

TABLE OF CONTENTS

1. Introduction ................................................. 2 2. TCP Window Scale Option ...................................... 8 3. RTTM -- Round-Trip Time Measurement .......................... 11 4. PAWS -- Protect Against Wrapped Sequence Numbers ............. 17 5. Conclusions and Acknowledgments .............................. 25 6. References ................................................... 25 APPENDIX A: Implementation Suggestions ........................... 27 APPENDIX B: Duplicates from Earlier Connection Incarnations ...... 27 APPENDIX C: Changes from RFC-1072, RFC-1185 ...................... 30 APPENDIX D: Summary of Notation .................................. 31 APPENDIX E: Event Processing ..................................... 32 Security Considerations .......................................... 37

Jacobson, Braden, & Borman [Page 1]

RFC 1323 TCP Extensions for High Performance May 1992

Authors’ Addresses ............................................... 37

1. INTRODUCTION

The TCP protocol [Postel81] was designed to operate reliably over almost any transmission medium regardless of transmission rate, delay, corruption, duplication, or reordering of segments. Production TCP implementations currently adapt to transfer rates in the range of 100 bps to 10**7 bps and round-trip delays in the range 1 ms to 100 seconds. Recent work on TCP performance has shown that TCP can work well over a variety of Internet paths, ranging from 800 Mbit/sec I/O channels to 300 bit/sec dial-up modems [Jacobson88a].

The introduction of fiber optics is resulting in ever-higher transmission speeds, and the fastest paths are moving out of the domain for which TCP was originally engineered. This memo defines a set of modest extension...

Processing...
Loading...