Duplicate Address Detection Proxy
draft-ietf-6man-dad-proxy-03

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Document Type Active Internet-Draft (6man WG)
Last updated 2012-06-13
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6man Working Group                                              F. Costa
Internet-Draft                                               J-M. Combes
Intended status: Standards Track                             X. Pougnard
Expires: December 14, 2012                         France Telecom Orange
                                                                   H. Li
                                                     Huawei Technologies
                                                           June 12, 2012

                   Duplicate Address Detection Proxy
                      draft-ietf-6man-dad-proxy-03

Abstract

   The document describes a mechanism allowing the use of Duplicate
   Address Detection (DAD) by IPv6 nodes in a point-to-multipoint
   architecture with "split-horizon" forwarding scheme.  Based on the
   DAD signalling, the first hop router stores in a Binding Table all
   known IPv6 addresses used on a point-to-multipoint domain (e.g.
   VLAN).  When a node performs DAD for an address already used by
   another node, the first hop router replies instead of this last one.

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
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   This Internet-Draft will expire on December 14, 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
   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
   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
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  3
   2.  Background . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Why existing IETF solutions are not sufficient?  . . . . . . .  4
     3.1.  Duplicate Address Detection  . . . . . . . . . . . . . . .  5
     3.2.  Neighbor Discovery Proxy . . . . . . . . . . . . . . . . .  5
     3.3.  6LoWPAN Neighbor Discovery . . . . . . . . . . . . . . . .  5
     3.4.  IPv6 Mobility Manager  . . . . . . . . . . . . . . . . . .  6
   4.  Duplicate Address Detection Proxy (DAD-Proxy)
       specifications . . . . . . . . . . . . . . . . . . . . . . . .  6
     4.1.  DAD-Proxy Data structure . . . . . . . . . . . . . . . . .  6
     4.2.  DAD-Proxy mechanism  . . . . . . . . . . . . . . . . . . .  7
       4.2.1.  No entry exists for the tentative address  . . . . . .  7
       4.2.2.  An entry already exists for the tentative address  . .  7
       4.2.3.  Confirmation of reachability to check the validity
               of the conflict  . . . . . . . . . . . . . . . . . . .  8
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
     6.1.  Interoperability with SEND . . . . . . . . . . . . . . . . 10
     6.2.  IP source address spoofing protection  . . . . . . . . . . 11
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 11
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 11
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 11
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12

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1.  Introduction

   This document explains why Duplicate Address Detection (DAD)
   mechanism [RFC4862] cannot be used in a point-to-multipoint
   architecture with "split-horizon" forwarding scheme (IPv6 over PPP
   [RFC5072] is not affected).  One of the main reasons is that, because
   of this forwarding scheme, IPv6 nodes on the same point-to-multipoint
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