IPv6 Node Requirements
RFC 8504

Document Type RFC - Best Current Practice (January 2019; No errata)
Obsoletes RFC 6434
Also known as BCP 220
Last updated 2019-01-30
Replaces draft-clw-rfc6434-bis
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Bob Hinden
Shepherd write-up Show (last changed 2018-03-21)
IESG IESG state RFC 8504 (Best Current Practice)
Consensus Boilerplate Yes
Telechat date
Responsible AD Suresh Krishnan
Send notices to Robert Hinden <bob.hinden@gmail.com>
IANA IANA review state Version Changed - Review Needed
IANA action state No IANA Actions
Internet Engineering Task Force (IETF)                          T. Chown
Request for Comments: 8504                                          Jisc
BCP: 220                                                     J. Loughney
Obsoletes: 6434                                                    Intel
Category: Best Current Practice                               T. Winters
ISSN: 2070-1721                                                  UNH-IOL
                                                            January 2019

                         IPv6 Node Requirements

Abstract

   This document defines requirements for IPv6 nodes.  It is expected
   that IPv6 will be deployed in a wide range of devices and situations.
   Specifying the requirements for IPv6 nodes allows IPv6 to function
   well and interoperate in a large number of situations and
   deployments.

   This document obsoletes RFC 6434, and in turn RFC 4294.

Status of This Memo

   This memo documents an Internet Best Current Practice.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   BCPs is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8504.

Chown, et al.             Best Current Practice                 [Page 1]
RFC 8504                 IPv6 Node Requirements             January 2019

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Scope of This Document  . . . . . . . . . . . . . . . . .   4
     1.2.  Description of IPv6 Nodes . . . . . . . . . . . . . . . .   5
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   5
   3.  Abbreviations Used in This Document . . . . . . . . . . . . .   5
   4.  Sub-IP Layer  . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  IP Layer  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Internet Protocol Version 6 - RFC 8200  . . . . . . . . .   6
     5.2.  Support for IPv6 Extension Headers  . . . . . . . . . . .   7
     5.3.  Protecting a Node from Excessive Extension Header Options   8
     5.4.  Neighbor Discovery for IPv6 - RFC 4861  . . . . . . . . .   9
     5.5.  SEcure Neighbor Discovery (SEND) - RFC 3971 . . . . . . .  11
     5.6.  IPv6 Router Advertisement Flags Option - RFC 5175 . . . .  11
     5.7.  Path MTU Discovery and Packet Size  . . . . . . . . . . .  11
       5.7.1.  Path MTU Discovery - RFC 8201 . . . . . . . . . . . .  11
       5.7.2.  Minimum MTU Considerations  . . . . . . . . . . . . .  12
     5.8.  ICMP for the Internet Protocol Version 6 (IPv6) -
           RFC 4443  . . . . . . . . . . . . . . . . . . . . . . . .  12
     5.9.  Default Router Preferences and More-Specific Routes -
           RFC 4191  . . . . . . . . . . . . . . . . . . . . . . . .  12
     5.10. First-Hop Router Selection - RFC 8028 . . . . . . . . . .  12
     5.11. Multicast Listener Discovery (MLD) for IPv6 - RFC 3810  .  13
     5.12. Explicit Congestion Notification (ECN) - RFC 3168 . . . .  13
   6.  Addressing and Address Configuration  . . . . . . . . . . . .  13
     6.1.  IP Version 6 Addressing Architecture - RFC 4291 . . . . .  13
     6.2.  Host Address Availability Recommendations . . . . . . . .  13
     6.3.  IPv6 Stateless Address Autoconfiguration - RFC 4862 . . .  14
     6.4.  Privacy Extensions for Address Configuration in IPv6 -
           RFC 4941  . . . . . . . . . . . . . . . . . . . . . . . .  15

Chown, et al.             Best Current Practice                 [Page 2]
RFC 8504                 IPv6 Node Requirements             January 2019

     6.5.  Stateful Address Autoconfiguration (DHCPv6) - RFC 3315  .  16
     6.6.  Default Address Selection for IPv6 - RFC 6724 . . . . . .  16
   7.  DNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
   8.  Configuring Non-address Information . . . . . . . . . . . . .  17
     8.1.  DHCP for Other Configuration Information  . . . . . . . .  17
     8.2.  Router Advertisements and Default Gateway . . . . . . . .  17
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