INTERNET-DRAFT Cameron Byrne Intended Status: Informational T-Mobile US Expires: April 13, 2014 October 10, 2013 464XLAT CLAT IPv4 Address draft-byrne-v6ops-clatip-00 Abstract DS-Lite [RFC6333] directs IANA to reserve 192.0.0.0/29 for the use of the B4 element. This memo generalizes that reservation to include a similar purpose on the host-based CLAT IPv4 interfaces in the 464XLAT architecture [RFC6877]. Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. 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." The list of current Internet-Drafts can be accessed at http://www.ietf.org/1id-abstracts.html The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html Copyright and License Notice Copyright (c) 2013 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 Byrne Expires April 13, 2014 [Page 1] INTERNET DRAFT 464XLAT CLAT IPv4 Address October 10, 2013 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 . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Choosing 192.0.0.0/29 . . . . . . . . . . . . . . . . . . . . 3 3 Security Considerations . . . . . . . . . . . . . . . . . . . . 3 4 IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3 5 References . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5.1 Normative References . . . . . . . . . . . . . . . . . . . 3 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 4 Byrne Expires April 13, 2014 [Page 2] INTERNET DRAFT 464XLAT CLAT IPv4 Address October 10, 2013 1 Introduction 464XLAT [RFC6877] describes an architecture for providing IPv4 communication over an IPv6-only 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 network stack and for applications to bind sockets. Any locally unique IPv4 address can be configured on the host-based 464XLAT CLAT interface. This memo directs IANA to update its registry of 192.0.0.0/29 to include the use for the IPv4 interface in host based CLAT by changing the allocation from DS-Lite to "IPv6 Transition Technology System Subnet". 2. Choosing 192.0.0.0/29 To avoid conflicts with any other network that may communicate with the CLAT, a unique address must be assigned. IANA has defined a well-known range, 192.0.0.0/29, in [RFC6333], which is dedicated for DS-lite. 192.0.0.0 is the reserved subnet address. As defined in [RFC6333], this subnet is only present between the B4 and the AFTR and is never emitted "on the wire". This range may be generalized to include 464XLAT with host based CLAT and will continue to never be emitted "on the wire". 3 Security Considerations No new security considerations beyond what is described [RFC6333] and [RFC6877]. 4 IANA Considerations IANA is directed to generalize the reservation of 192.0.0.0/29 from DS-lite to "IPv6 Transition Technology System Subnet". 5 References 5.1 Normative References [RFC6333] Durand, A., Droms, R., Woodyatt, J., and Y. Lee, "Dual- Stack Lite Broadband Deployments Following IPv4 Exhaustion", RFC 6333, August 2011. Byrne Expires April 13, 2014 [Page 3] INTERNET DRAFT 464XLAT CLAT IPv4 Address October 10, 2013 [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 Byrne Expires April 13, 2014 [Page 4]