DoD standard Transmission Control Protocol
RFC 761
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(January 1980; No errata)
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2016-04-08
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RFC: 761
IEN: 129
DOD STANDARD
TRANSMISSION CONTROL PROTOCOL
January 1980
prepared for
Defense Advanced Research Projects Agency
Information Processing Techniques Office
1400 Wilson Boulevard
Arlington, Virginia 22209
by
Information Sciences Institute
University of Southern California
4676 Admiralty Way
Marina del Rey, California 90291
January 1980
Transmission Control Protocol
TABLE OF CONTENTS
PREFACE ........................................................ iii
1. INTRODUCTION ..................................................... 1
1.1 Motivation .................................................... 1
1.2 Scope ......................................................... 2
1.3 About This Document ........................................... 2
1.4 Interfaces .................................................... 3
1.5 Operation ..................................................... 3
2. PHILOSOPHY ....................................................... 7
2.1 Elements of the Internetwork System ........................... 7
2.2 Model of Operation ............................................ 7
2.3 The Host Environment .......................................... 8
2.4 Interfaces .................................................... 9
2.5 Relation to Other Protocols ................................... 9
2.6 Reliable Communication ....................................... 10
2.7 Connection Establishment and Clearing ........................ 10
2.8 Data Communication ........................................... 12
2.9 Precedence and Security ...................................... 13
2.10 Robustness Principle ......................................... 13
3. FUNCTIONAL SPECIFICATION ........................................ 15
3.1 Header Format ................................................ 15
3.2 Terminology .................................................. 19
3.3 Sequence Numbers ............................................. 24
3.4 Establishing a connection .................................... 29
3.5 Closing a Connection ......................................... 35
3.6 Precedence and Security ...................................... 38
3.7 Data Communication ........................................... 38
3.8 Interfaces ................................................... 42
3.9 Event Processing ............................................. 52
GLOSSARY ............................................................ 75
REFERENCES .......................................................... 83
[Page i]
January 1980
Transmission Control Protocol
[Page ii]
January 1980
Transmission Control Protocol
PREFACE
This document describes the DoD Standard Transmission Control Protocol
(TCP). There have been eight earlier editions of the ARPA TCP
specification on which this standard is based, and the present text
draws heavily from them. There have been many contributors to this work
both in terms of concepts and in terms of text. This edition
incorporates the addition of security, compartmentation, and precedence
concepts into the TCP specification.
Jon Postel
Editor
[Page iii]
January 1980
RFC:761
IEN:129
Replaces: IENs 124, 112,
81, 55, 44, 40, 27, 21, 5
DOD STANDARD
TRANSMISSION CONTROL PROTOCOL
1. INTRODUCTION
The Transmission Control Protocol (TCP) is intended for use as a highly
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