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Versions: (draft-byrne-v6ops-clatip) 00 01 02
03 04 RFC 7335
INTERNET-DRAFT Cameron Byrne
Intended Status: Informational T-Mobile US
Expires: November 6, 2014 May 5, 2014
IPv4 Service Continuity Prefix
draft-ietf-v6ops-clatip-00
Abstract
DS-Lite, defined in RFC 6333, directs IANA to reserve 192.0.0.0/29
for the B4 element. This memo directs IANA to generalize that
reservation to include other cases where a non-routed IPv4 interface
must be numbered as part of an IPv6 transition solution.
Status of this Memo
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Copyright and License Notice
Copyright (c) 2014 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
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carefully, as they describe your rights and restrictions with respect
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Table of Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 The Case of 464XLAT . . . . . . . . . . . . . . . . . . . . . . 3
3. Choosing 192.0.0.0/29 . . . . . . . . . . . . . . . . . . . . 3
4 Security Considerations . . . . . . . . . . . . . . . . . . . . 3
5 IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
6 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 4
7 References . . . . . . . . . . . . . . . . . . . . . . . . . . 4
7.1 Normative References . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 4
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1 Introduction
DS-Lite [RFC6333] directs IANA to reserve 192.0.0.0/29 for the B4
element. This memo generalizes that IANA reservation to include
other cases where a non-routed IPv4 interface must be numbered in an
IPv6 transition solution. IANA shall list the address block
192.0.0.0/29 reserved for IPv4 Service Continuity Prefix. The result
is that 192.0.0.0/29 may be used in any system that requires IPv4
addresses for backward compatibility with IPv4 communications in an
IPv6-only network, but does not emit IPv4 packets "on the wire".
2 The Case of 464XLAT
464XLAT [RFC6877] describes an architecture for providing IPv4
communication over an IPv6-only access network. One of the methods
described in [RFC6877] is for the client side translator (CLAT) to be
embedded in the host, such as a smartphone. In this scenario, the
host must have an IPv4 address configured to present to the host
network stack and for applications to bind sockets.
3. Choosing 192.0.0.0/29
To avoid conflicts with any other network that may communicate with
the CLAT or other IPv6 transition solution, a locally unique IPv4
address must be assigned.
IANA has defined a well-known range, 192.0.0.0/29, in [RFC6333],
which is dedicated for DS-lite. As defined in [RFC6333], this subnet
is only present between the B4 and the AFTR and never emits packets
from this prefix "on the wire". 464XLAT has the same need for a non-
routed IPv4 prefix, and this same need may be common for other
similar solutions. It is most prudent and effective to generalize
192.0.0.0/29 for the use of supporting IPv4 interfaces in IPv6
transition technologies rather than reserving a prefix for every
possible solution.
With this memo, 192.0.0.0/29 is now generalized across multiple IPv4
continuity solutions such as 464XLAT and DS-lite. It is important
that a host never be deployed with 2 active IPv4 continuity solutions
simultaneously in a way that would cause a node to have overlapping
address from 192.0.0.0/29.
4 Security Considerations
No new security considerations beyond what is described [RFC6333] and
[RFC6877].
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5 IANA Considerations
IANA is directed to generalize the reservation of 192.0.0.0/29 from
DS-lite to "IPv4 Service Continuity Prefix".
6 Acknowledgements
This document has been substantially improved by specific feedback
from Dave Thaler, Fred Baker, Wes George, Lorenzo Colitti, and
Mohamed Boucadair.
7 References
7.1 Normative References
[RFC6333] Durand, A., Droms, R., Woodyatt, J., and Y. Lee, "Dual-
Stack Lite Broadband Deployments Following IPv4
Exhaustion", RFC6333, August 2011.
[RFC6877] Mawatari, M., Kawashima, M., and C. Byrne, "464XLAT:
Combination of Stateful and Stateless Translation",
RFC6877, April 2013.
Authors' Addresses
Cameron Byrne
Bellevue, WA, USA
Email: Cameron.Byrne@T-Mobile.com
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