IPv6 Router Advertisement IPv6-Only Flag
draft-ietf-6man-ipv6only-flag-05
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2019-06-21
(latest revision 2019-03-07)
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draft-hinden-ipv4flag
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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: September 8, 2019 B. Zeeb
March 7, 2019
IPv6 Router Advertisement IPv6-Only Flag
draft-ietf-6man-ipv6only-flag-05
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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 8, 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
(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
Hinden, et al. Expires September 8, 2019 [Page 1]
Internet-Draft IPv6-Only Flag March 2019
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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 . . . . . . . . . . . . . . . . . . . . . 8
9. Security Considerations . . . . . . . . . . . . . . . . . . . 8
10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 9
11. Change log [RFC Editor: Please remove] . . . . . . . . . . . 9
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
12.1. Normative References . . . . . . . . . . . . . . . . . . 12
12.2. Informative References . . . . . . . . . . . . . . . . . 13
Appendix A. Implementaton Status [RFC Editor: Please remove] . . 14
A.1. FreeBSD Implementation . . . . . . . . . . . . . . . . . 14
A.2. Test using Scapy . . . . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15
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.
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o Switches in multi-segment wireless networks may create IPv4 state
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