Internet Official Protocol Standards
RFC 2400

Document Type RFC - Historic (September 1998; No errata)
Obsoleted by RFC 2500
Obsoletes RFC 2300
Last updated 2013-03-02
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Network Working Group                        Internet Architecture Board
Request for Comments: 2400                                     J. Postel
Obsoletes: 2300, 2200, 2000, 1920, 1880,                     J. Reynolds
1800, 1780, 1720, 1610, 1600, 1540, 1500, 1410,                  Editors
1360, 1280, 1250, 1200, 1140, 1130, 1100, 1083            September 1998
STD: 1
Category: Standards Track

                  INTERNET OFFICIAL PROTOCOL STANDARDS

Status of this Memo

   This memo describes the state of standardization of protocols used in
   the Internet as determined by the Internet Architecture Board (IAB).
   This memo is an Internet Standard.  Distribution of this memo is
   unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1998).  All Rights Reserved.

Table of Contents

   Introduction . . . . . . . . . . . . . . . . . . . . . . . . .   2
   1.  The Standardization Process  . . . . . . . . . . . . . . .   3
   2.  The Request for Comments Documents . . . . . . . . . . . .   5
   3.  Other Reference Documents  . . . . . . . . . . . . . . . .   6
   3.1.  Assigned Numbers . . . . . . . . . . . . . . . . . . . .   6
   3.2.  Gateway Requirements . . . . . . . . . . . . . . . . . .   6
   3.3.  Host Requirements  . . . . . . . . . . . . . . . . . . .   6
   3.4.  The MIL-STD Documents  . . . . . . . . . . . . . . . . .   6
   4.  Explanation of Terms . . . . . . . . . . . . . . . . . . .   7
   4.1.  Definitions of Protocol State (Maturity Level) . . . . .   8
   4.1.1.  Standard Protocol  . . . . . . . . . . . . . . . . . .   8
   4.1.2.  Draft Standard Protocol  . . . . . . . . . . . . . . .   8
   4.1.3.  Proposed Standard Protocol . . . . . . . . . . . . . .   8
   4.1.4.  Experimental Protocol  . . . . . . . . . . . . . . . .   8
   4.1.5.  Informational Protocol . . . . . . . . . . . . . . . .   9
   4.1.6.  Historic Protocol  . . . . . . . . . . . . . . . . . .   9
   4.2.  Definitions of Protocol Status (Requirement Level) . . .   9
   4.2.1.  Required Protocol  . . . . . . . . . . . . . . . . . .   9
   4.2.2.  Recommended Protocol . . . . . . . . . . . . . . . . .   9
   4.2.3.  Elective Protocol  . . . . . . . . . . . . . . . . . .   9
   4.2.4.  Limited Use Protocol . . . . . . . . . . . . . . . . .   9
   4.2.5.  Not Recommended Protocol . . . . . . . . . . . . . . .   9
   5.  The Standards Track  . . . . . . . . . . . . . . . . . . .  10

Internet Architecture Board Standards Track                     [Page 1]
RFC 2400                   Internet Standards             September 1998

   5.1.  The RFC Processing Decision Table  . . . . . . . . . . .  10
   5.2.  The Standards Track Diagram  . . . . . . . . . . . . . .  11
   6.  The Protocols  . . . . . . . . . . . . . . . . . . . . . .  13
   6.1.  Recent Changes . . . . . . . . . . . . . . . . . . . . .  13
   6.1.1.  New RFCs . . . . . . . . . . . . . . . . . . . . . . .  13
   6.1.2.  Other Changes  . . . . . . . . . . . . . . . . . . . .  20
   6.2.  Standard Protocols . . . . . . . . . . . . . . . . . . .  21
   6.3.  Network-Specific Standard Protocols  . . . . . . . . . .  23
   6.4.  Draft Standard Protocols . . . . . . . . . . . . . . . .  24
   6.5.  Proposed Standard Protocols  . . . . . . . . . . . . . .  26
   6.6.  Telnet Options . . . . . . . . . . . . . . . . . . . . .  33
   6.7.  Experimental Protocols . . . . . . . . . . . . . . . . .  35
   6.8.  Informational Protocols  . . . . . . . . . . . . . . . .  38
   6.9.  Historic Protocols . . . . . . . . . . . . . . . . . . .  40
   6.10  Obsolete Protocols . . . . . . . . . . . . . . . . . . .  41
   7.  Contacts . . . . . . . . . . . . . . . . . . . . . . . . .  42
   7.1.  IAB, IETF, and IRTF Contacts . . . . . . . . . . . . . .  42
   7.1.1.  Internet Architecture Board (IAB) Contact  . . . . . .  42
   7.1.2.  Internet Engineering Task Force (IETF) Contact . . . .  42
   7.1.3.  Internet Research Task Force (IRTF) Contact  . . . . .  43
   7.2.  Internet Assigned Numbers Authority (IANA) Contact . . .  44
   7.3.  Request for Comments Editor Contact  . . . . . . . . . .  45
   7.4.  Network Information Center Contact . . . . . . . . . . .  45
   7.5.  Sources for Requests for Comments  . . . . . . . . . . .  46
   8.  Security Considerations  . . . . . . . . . . . . . . . . .  46
   9.  Author's Address . . . . . . . . . . . . . . . . . . . . .  46
   10. Full Copyright Statement . . . . . . . . . . . . . . . . .  47

Introduction

   A discussion of the standardization process and the RFC document
   series is presented first, followed by an explanation of the terms.
   Sections 6.2 - 6.10 contain the lists of protocols in each stage of
   standardization.  Finally, there are pointers to references and
   contacts for further information.

   This memo is intended to be issued every one hundred RFCs; please be
   sure the copy you are reading is current.  Current copies may be
   obtained from the Requests for Comments Editor (RFC-EDITOR) or from
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