IPv6 Router Advertisement IPv6-Only Flag
draft-ietf-6man-ipv6only-flag-04

Document Type Active Internet-Draft (6man WG)
Last updated 2018-11-04
Replaces draft-hinden-ipv4flag
Stream IETF
Intended RFC status Proposed Standard
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Network Working Group                                          R. Hinden
Internet-Draft                                      Check Point Software
Updates: 4861, 5175 (if approved)                           B. Carpenter
Intended status: Standards Track                       Univ. of Auckland
Expires: May 9, 2019                                    November 5, 2018

                IPv6 Router Advertisement IPv6-Only Flag
                    draft-ietf-6man-ipv6only-flag-04

Abstract

   This document specifies a Router Advertisement Flag to indicate to
   hosts that the administrator has configured the router to advertise
   that the link is IPv6-Only.  This document updates RFC4861 and
   RFC5175.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 9, 2019.

Copyright Notice

   Copyright (c) 2018 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
   (http://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.

Hinden & Carpenter         Expires May 9, 2019                  [Page 1]
Internet-Draft               IPv6-Only Flag                November 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   4
   3.  Applicability Statements  . . . . . . . . . . . . . . . . . .   4
   4.  IPv6-Only Definition  . . . . . . . . . . . . . . . . . . . .   5
   5.  IPv6-Only Flag  . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Router and Operational Considerations . . . . . . . . . . . .   6
   7.  Host Behavior Considerations  . . . . . . . . . . . . . . . .   7
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   11. Change log [RFC Editor: Please remove]  . . . . . . . . . . .   9
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     12.2.  Informative References . . . . . . . . . . . . . . . . .  12
   Appendix A.  Implementaton Status . . . . . . . . . . . . . . . .  13
     A.1.  FreeBSD Implementation  . . . . . . . . . . . . . . . . .  13
     A.2.  Test using Scapy  . . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   This document specifies a Router Advertisement Flag to indicate to
   hosts that the administrator has configured the router to advertise
   that the link is IPv6-Only.  The flag only applies to IPv6 default
   routers.

   Hosts that support IPv4 and IPv6, usually called dual stack hosts,
   need to also work efficiently on IPv6-Only links, i.e, links where
   there are no IPv4 routers and/or IPv4 services.  Dual stack is the
   default configuration for most current host operating systems such as
   Windows 10, iOS, Android, Linux, and BSD, as well as devices such as
   some printers.  Monitoring of an IPv6-Only link, for example at the
   IETF 100 meeting in Singapore, shows that current dual stack hosts
   will create local auto-configured IPv4 addresses and attempt to reach
   IPv4 services, even though they cannot configure a normal address
   using DHCP.  This may be a problem for several reasons, depending on
   the equipment in use and its configuration, especially on large
   wireless networks:

   o  It may result in an undesirable level of wasted Layer 2 broadcast
      traffic.

   o  Switches in multi-segment wireless networks may create IPv4 state
      for dual stack hosts (in particular, ARP cache entries to support
      ARP proxying).

Hinden & Carpenter         Expires May 9, 2019                  [Page 2]
Internet-Draft               IPv6-Only Flag                November 2018
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