Titel:

Internet Protokol

Beschreibung:  The Internet Protocol is designed for use in interconnected systems of packet-switched computer communication networks.
Autor:The Internet Society
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ISBN: 3423050012   ISBN: 3423050012   ISBN: 3423050012   ISBN: 3423050012 
 
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RFC: 791

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

INTERNET PROTOCOL DARPA INTERNET PROGRAM PROTOCOL SPECIFICATION


TABLE OF CONTENTS

1. INTRODUCTION ................................................. 1

1.1 Motivation .................................................... .........1
1.2 Scope ......................................................... ..........1
1.3 Interfaces .................................................... ..........1
1.4 Operation ..................................................... ........2

2. OVERVIEW ......................................................... 5

2.1 Relation to Other Protocols ................................... 9
2.2 Model of Operation ............................................ ..5
2.3 Function Description .......................................... ...7
2.4 Gateways ...................................................... .......9

3. SPECIFICATION .................................................11

3.1 Internet Header Format ....................................... 11
3.2 Discussion ................................................... ........23
3.3 Interfaces ................................................... .........31

APPENDIX A: Examples & Scenarios .......................34
APPENDIX B: Data Transmission Order ...................39

GLOSSARY ............................................................ 41

REFERENCES ........................................................ 45


PREFACE


This document specifies the DoD Standard Internet Protocol. This document is based on six earlier editions of the ARPA Internet Protocol Specification, 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 revises aspects of addressing, error handling, option codes, and the security, precedence, compartments, and handling restriction features of the internet protocol.

Jon Postel

Editor


1. INTRODUCTION

1.1. Motivation

The Internet Protocol is designed for use in interconnected systems of packet-switched computer communication networks. Such a system has been called a "catenet" [1]. The internet protocol provides for transmitting blocks of data called datagrams from sources to destinations, where sources and destinations are hosts identified by fixed length addresses. The internet protocol also provides for fragmentation and reassembly of long datagrams, if necessary, for transmission through "small packet" networks.

1.2. Scope

The internet protocol is specifically limited in scope to provide the functions necessary to deliver a package of bits (an internet datagram) from a source to a destination over an interconnected system of networks. There are no mechanisms to augment end-to-end data reliability, flow control, sequencing, or other services commonly found in host-to-host protocols. The internet protocol can capitalize on the services of its supporting networks to provide various types and qualities of service.

1.3. Interfaces

This protocol is called on by host-to-host protocols in an internet environment. This protocol calls on local network protocols to carry the internet datagram to the next gateway or destination host.

For example, a TCP module would call on the internet module to take a TCP segment (including the TCP header and user data) as the data portion of an internet datagram. The TCP module would provide the addresses and other parameters in the internet header to the internet module as arguments of the call. The internet module would then create an internet datagram and call on the local network interface to transmit the internet datagram.

In the ARPANET case, for example, the internet module would call on a local net module which would add the 1822 leader [2] to the internet datagram creating an ARPANET message to transmit to the IMP. The ARPANET address would be derived from the internet address by the local network interface and would be the address of some host in the ARPANET, that host might be a gateway to other networks.

  
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