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Requirements for Internet Hosts - Communication Layers (RFC1122)

IP.com Disclosure Number: IPCOM000001932D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2019-Feb-18

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Braden: AUTHOR

Related Documents

10.17487/RFC1122: DOI

Abstract

This RFC is an official specification for the Internet community. It incorporates by reference, amends, corrects, and supplements the primary protocol standards documents relating to hosts. [STANDARDS-TRACK]

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 2% of the total text.

Network Working Group Internet Engineering Task Force Request for Comments: 1122 R. Braden, Editor October 1989

Requirements for Internet Hosts -- Communication Layers

Status of This Memo

This RFC is an official specification for the Internet community. It incorporates by reference, amends, corrects, and supplements the primary protocol standards documents relating to hosts. Distribution of this document is unlimited.

Summary

This is one RFC of a pair that defines and discusses the requirements for Internet host software. This RFC covers the communications protocol layers: link layer, IP layer, and transport layer; its companion RFC-1123 covers the application and support protocols.

Table of Contents

1. INTRODUCTION ............................................... 5 1.1 The Internet Architecture .............................. 6 1.1.1 Internet Hosts .................................... 6 1.1.2 Architectural Assumptions ......................... 7 1.1.3 Internet Protocol Suite ........................... 8 1.1.4 Embedded Gateway Code ............................. 10 1.2 General Considerations ................................. 12 1.2.1 Continuing Internet Evolution ..................... 12 1.2.2 Robustness Principle .............................. 12 1.2.3 Error Logging ..................................... 13 1.2.4 Configuration ..................................... 14 1.3 Reading this Document .................................. 15 1.3.1 Organization ...................................... 15 1.3.2 Requirements ...................................... 16 1.3.3 Terminology ....................................... 17 1.4 Acknowledgments ........................................ 20

2. LINK LAYER .................................................. 21 2.1 INTRODUCTION ........................................... 21

Internet Engineering Task Force [Page 1]

RFC1122 INTRODUCTION October 1989

2.2 PROTOCOL WALK-THROUGH .................................. 21 2.3 SPECIFIC ISSUES ........................................ 21 2.3.1 Trailer Protocol Negotiation ...................... 21 2.3.2 Address Resolution Protocol -- ARP ................ 22 2.3.2.1 ARP Cache Validation ......................... 22 2.3.2.2 ARP Packet Queue ............................. 24 2.3.3 Ethernet and IEEE 802 Encapsulation ............... 24 2.4 LINK/INTERNET LAYER INTERFACE .......................... 25 2.5 LINK LAYER REQUIREMENTS SUMMARY ........................ 26

3. INTERNET LAYER PROTOCOLS .................................... 27 3.1 INTRODUCTION ............................................ 27 3.2 PROTOCOL WALK-THROUGH .................................. 29 3.2.1 Internet Protocol -- IP ............................ 29 3.2.1.1 Version Number ............................... 29 3.2.1.2 Checksum ..................................... 29 3.2.1.3 Addressing ................................... 29 3.2.1.4 Fragmentation and Reassembly ................. 32 3.2.1.5 Identification ........................

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