Protocol for providing the connectionless mode network services
RFC 926

Document Type RFC - Unknown (December 1984; No errata)
Obsoleted by RFC 994
Last updated 2013-03-02
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Network Working Group                                                ISO
Request for Comments: 926                                  December 1984

 
 
    Protocol for Providing the Connectionless-Mode Network Services
 
                         (Informally - ISO IP)

                              ISO DIS 8473

Status of this Memo:

 This document is distributed as an RFC for information only.  It does
 not specify a standard for the ARPA-Internet.  Distribution of this
 memo is unlimited.

Note:

 This document has been prepared by retyping the text of ISO DIS 8473 of
 May 1984, which is currently undergoing voting within ISO as a Draft
 International Standard (DIS).  Although this RFC has been reviewed
 after typing, and is believed to be substantially correct, it is
 possible that typographic errors not present in the ISO document have
 been overlooked.

 Alex McKenzie
 BBN



RFC 926                                                    December 1984



RFC 926                                                    December 1984

                           TABLE OF CONTENTS

 1   SCOPE AND FIELD OF APPLICATION........................ 2

 2   REFERENCES............................................ 3

 3   DEFINITIONS........................................... 4
 3.1   Reference Model Definitions......................... 4
 3.2   Service Conventions Definitions..................... 4
 3.3   Network Layer Architecture Definitions.............. 4
 3.4   Network Layer Addressing Definitions................ 5
 3.5   Additional Definitions.............................. 5

 4   SYMBOLS AND ABBREVIATIONS............................. 7
 4.1   Data Units.......................................... 7
 4.2   Protocol Data Units................................. 7
 4.3   Protocol Data Unit Fields........................... 7
 4.4   Parameters.......................................... 8
 4.5   Miscellaneous....................................... 8

 5   OVERVIEW OF THE PROTOCOL.............................. 9
 5.1   Internal Organization of the Network Layer.......... 9
 5.2   Subsets of the Protocol............................. 9
 5.3   Addressing......................................... 10
 5.4   Service Provided by the Network Layer.............. 10
 5.5   Service Assumed from the Subnetwork Service
    Provider.............................................. 11
 5.5.1   Subnetwork Addresses............................. 12
 5.5.2   Subnetwork Quality of Service.................... 12
 5.5.3   Subnetwork User Data............................. 13
 5.5.4   Subnetwork Dependent Convergence Functions....... 13
 5.6   Service Assumed from Local Evironment.............. 14

 6   PROTOCOL FUNCTIONS................................... 16
 6.1   PDU Composition Function........................... 16
 6.2   PDU Decomposition Function......................... 17
 6.3   Header Format Analysis Function.................... 17
 6.4   PDU Lifetime Control Function...................... 18
 6.5   Route PDU Function................................. 18
 6.6   Forward PDU Function............................... 19
 6.7   Segmentation Function.............................. 19
 6.8   Reassembly Function................................ 20
 6.9   Discard PDU Function............................... 21

ISO DIS 8473 (May 1984)                                         [Page i]



RFC 926                                                    December 1984

 6.10   Error Reporting Function.......................... 22
 6.10.1   Overview........................................ 22
 6.10.2   Requirements.................................... 23
 6.10.3   Processing of Error Reports..................... 24
 6.11   PDU Header Error Detection........................ 25
 6.12   Padding Function.................................. 26
 6.13   Security.......................................... 26
 6.14   Source Routing Function........................... 27
 6.15   Record Route Function............................. 28
 6.16   Quality of Service Maintenance Function........... 29
 6.17   Classification of Functions....................... 29

 7   STRUCTURE AND ENCODING OF PDUS....................... 32
 7.1   Structure.......................................... 32
 7.2   Fixed Part......................................... 34
 7.2.1   General.......................................... 34
 7.2.2   Network Layer Protocol Identifier................ 34
 7.2.3   Length Indicator................................. 35
 7.2.4   Version/Protocol Identifier Extension............ 35
 7.2.5   PDU Lifetime..................................... 35
 7.2.6   Flags............................................ 36
 7.2.6.1   Segmentation Permitted and More Segments Flags. 36
 7.2.6.2   Error Report Flag.............................. 37
 7.2.7   Type Code........................................ 37
 7.2.8   PDU Segment Length............................... 37
 7.2.9   PDUChecksum...................................... 38
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