IPv6 Router Advertisement IPv6-Only Flag
draft-ietf-6man-ipv6only-flag-02

Document Type Active Internet-Draft (6man WG)
Last updated 2018-08-14
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: 5175 (if approved)                                 B. Carpenter
Intended status: Standards Track                       Univ. of Auckland
Expires: February 15, 2019                               August 14, 2018

                IPv6 Router Advertisement IPv6-Only Flag
                    draft-ietf-6man-ipv6only-flag-02

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 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
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on February 15, 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
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   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.

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Table of Contents

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

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 does not apply to non-default
   IPv6 routers.

   Hosts that support IPv4 and IPv6, usually called dual stack hosts,
   need to also work efficiently on IPv6 only links.  That is, a link
   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 printers.  Monitoring of 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.  This may be a problem for several reasons:

   o  It may result in an undesirable level of Layer 2 broadcast
      traffic, especially on large wireless networks.

   o  In particular, this may overload switches in multi-segment
      wireless networks because it will create IPv4 state for every dual
      stack host.

   o  Such traffic may drain battery power on wireless hosts that have
      no interest in link-local IPv4 traffic.  [RFC7772] indicates how
      this risk might be quantified.

   o  Similarly, hosts may waste battery power on futile attempts to
      access IPv4 services.

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   o  On an IPv6-only link, IPv4 might be used for malicious purposes
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