Secure Proxy ND Support for SEcure Neighbor Discovery (SEND)
RFC 6496

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Internet Engineering Task Force (IETF)                       S. Krishnan
Request for Comments: 6496                                      Ericsson
Category: Experimental                                       J. Laganier
ISSN: 2070-1721                                         Juniper Networks
                                                               M. Bonola
                                             Rome Tor Vergata University
                                                      A. Garcia-Martinez
                                                                    UC3M
                                                           February 2012

      Secure Proxy ND Support for SEcure Neighbor Discovery (SEND)

Abstract

   SEcure Neighbor Discovery (SEND) specifies a method for securing
   Neighbor Discovery (ND) signaling against specific threats.  As
   defined today, SEND assumes that the node sending an ND message is
   the owner of the address from which the message is sent and/or
   possesses a key that authorizes the node to act as a router, so that
   it is in possession of the private key or keys used to generate the
   digital signature on each message.  This means that the Proxy ND
   signaling performed by nodes that do not possess knowledge of the
   address owner's private key and/or knowledge of a router's key cannot
   be secured using SEND.  This document extends the current SEND
   specification in order to secure Proxy ND operation.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  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).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see 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/rfc6496.

Krishnan, et al.              Experimental                      [Page 1]
RFC 6496            Secure Proxy ND Support for SEND       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
   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
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   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 ....................................................2
   2. Requirements Notation ...........................................3
   3. Terminology .....................................................3
   4. Secure Proxy ND Overview ........................................4
   5. Secure Proxy ND Specification ...................................5
      5.1. Proxy Signature Option .....................................6
      5.2. Modified SEND Processing Rules .............................8
           5.2.1. Processing Rules for Senders ........................8
           5.2.2. Processing Rules for Receivers ......................9
      5.3. Proxying Link-Local Addresses .............................11
   6. Application Scenarios ..........................................11
      6.1. Scenario 1: Mobile IPv6 ...................................11
      6.2. Scenario 2: Proxy Mobile IPv6 .............................13
      6.3. Scenario 3: RFC 4389 Neighbor Discovery Proxy .............16
   7. Backward Compatibility with RFC 3971 Nodes and Non-SEND Nodes ..17
      7.1. Backward Compatibility with RFC 3971 Nodes ................17
      7.2. Backward Compatibility with Non-SEND Nodes ................18
   8. Security Considerations ........................................20
   9. IANA Considerations ............................................22
   10. Acknowledgements ..............................................22
   11. References ....................................................22
      11.1. Normative References .....................................22
      11.2. Informative References ...................................23

1.  Introduction

   SEcure Neighbor Discovery (SEND) [RFC3971] specifies a method for
   securing Neighbor Discovery (ND) signaling [RFC4861] against specific