RADIUS Extensions for Dual-Stack Lite
RFC 6519

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Internet Engineering Task Force (IETF)                       R. Maglione
Request for Comments: 6519                                Telecom Italia
Category: Standards Track                                      A. Durand
ISSN: 2070-1721                                         Juniper Networks
                                                           February 2012

                 RADIUS Extensions for Dual-Stack Lite

Abstract

   Dual-Stack Lite is a solution to offer both IPv4 and IPv6
   connectivity to customers that are addressed only with an IPv6
   prefix.  Dual-Stack Lite requires pre-configuration of the Dual-Stack
   Lite Address Family Transition Router (AFTR) tunnel information on
   the Basic Bridging BroadBand (B4) element.  In many networks, the
   customer profile information may be stored in Authentication,
   Authorization, and Accounting (AAA) servers, while client
   configurations are mainly provided through the Dynamic Host
   Configuration Protocol (DHCP).  This document specifies a new Remote
   Authentication Dial-In User Service (RADIUS) attribute to carry the
   Dual-Stack Lite AFTR tunnel name; the RADIUS attribute is defined
   based on the equivalent DHCPv6 OPTION_AFTR_NAME option.  This RADIUS
   attribute is meant to be used between the RADIUS server and the
   Network Access Server (NAS); it is not intended to be used directly
   between the B4 element and the RADIUS server.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6519.

Maglione & Durand            Standards Track                    [Page 1]
RFC 6519                DS-Lite RADIUS Extensions          February 2012

Copyright Notice

   Copyright (c) 2012 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
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   publication of this document.  Please review these documents
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   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
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   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
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   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................4
   3. DS-Lite Configuration with RADIUS and DHCPv6 ....................4
   4. RADIUS Attribute ................................................7
      4.1. DS-Lite-Tunnel-Name ........................................7
   5. Table of Attributes .............................................9
   6. Security Considerations .........................................9
   7. IANA Considerations .............................................9
   8. References .....................................................10
      8.1. Normative References ......................................10
      8.2. Informative References ....................................10

Maglione & Durand            Standards Track                    [Page 2]
RFC 6519                DS-Lite RADIUS Extensions          February 2012

1.  Introduction

   Dual-Stack Lite [RFC6333] is a solution to offer both IPv4 and IPv6
   connectivity to customers that are addressed only with an IPv6 prefix
   (no IPv4 address is assigned to the attachment device).  One of its
   key components is an IPv4-over-IPv6 tunnel, but a Dual-Stack-Lite
   Basic Bridging BroadBand (B4) element will not know if the network to
   which it is attached offers Dual-Stack Lite support.  Even if the B4