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Distributed Mobility Management (DMM)                             J. Lee
Internet-Draft                                      Sangmyung University
Intended status: Standards Track                                  Z. Yan
Expires: October 7, 2016                                           CNNIC
                                                           April 5, 2016


                  Deprecated Network Prefix Provision
                        draft-jhlee-dmm-dnpp-01

Abstract

   This document introduces new extensions to router advertisement and
   router solicitation messages.  The extensions are used to provide a
   mobile node's deprecated network prefix information to an access
   router.  This document updates [RFC4861].

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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."

   This Internet-Draft will expire on October 7, 2016.

Copyright Notice

   Copyright (c) 2016 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
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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.



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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Option Formats  . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Deprecated Network Prefix Provision in Router
           Solicitations . . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Deprecated Network Prefix Request in Router
           Advertisements  . . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   Router advertisement and router solicitation messages defined in
   [RFC4861] are used during stateless IPv6 autoconfiguration.  A mobile
   node listens for router advertisement messages that are periodically
   sent by access routers on the local link or are explicitly requested
   by the mobile node using a router solicitation message.  The router
   advertisement message contains information to allow the mobile node
   configures a global unicast IPv6 address.  The provided information
   by the router advertisement message is, for instance, network
   prefix(es), default router address(es), hop limit, etc.

   The router advertisement message is used by an access router to
   provide the network prefix information required for stateless IPv6
   autoconfiguration, whereas the router solicitation message is used by
   a mobile node to quickly receive the router advertisement message
   from the access router.  In other words, the current specification of
   Neighbor Discovery for IP version 6 does not specifies how the access
   router obtains the deprecated network prefix information (e.g.,
   previous network prefix information) from the mobile node keeping
   deprecated IPv6 address(es) that are for instance global unicast IPv6
   address(es) generated and used at previous access networks.

   This document introduces new extensions to router advertisement and
   router solicitation messages to allow a mobile node provides its
   deprecated network prefix information to an access router.

2.  Motivation

   A mobile node changes its point of attachment from a previous network
   to a new network while keeping its global unicast IPv6 address for
   communications with a correspondent node.  At the new network the



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   mobile node's global unicast IPv6 address previously configured at
   the previous network becomes a deprecated address.  The mobile node
   configures a new global unicast IPv6 address at the new network and
   uses the new address for new communications.  The mobile node also
   may use the deprecated address (i.e., the previously configured
   address at the previous network) for the communications with the
   correspondent node.

   Nowadays ingress filtering is widely used to prevent source address
   spoofing.  In this case, when the mobile node sends packets with the
   deprecated address as a source address at the new network, the
   packets will be filtered unless a rule of ingress filtering is
   updated in advance.

   An access router at the new network may need to obtain the mobile
   node's deprecated network prefix information.  For instance, the new
   access router needs to establish a bidirectional tunnel with the
   previous access router of the mobile node for the communications
   associated with the deprecated address of the mobile node
   [Paper-Distributed.Mobility].

3.  Option Formats

   A router solicitation message is extended to include the deprecated
   network prefix information.  A router advertisement message is
   extended to include a flag that requests the mobile node to send a
   router solicitation message including the deprecated network prefix
   information.

3.1.  Deprecated Network Prefix Provision in Router Solicitations

   A new flag is defined to indicate that a router solicitation message
   includes the deprecated network prefix information of a mobile node
   in the prefix information option.

    4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+
   |L|A|D|Reserved1|
   +-+-+-+-+-+-+-+-+

   D: 1-bit "Deprecated network prefix" flag.  It indicates that the
   prefix included in this prefix information option is the deprecated
   network prefix of the mobile node.

   When the mobile node wants to send the deprecated prefix to the new
   access router, the prefix information option is used to carry the
   deprecated network prefix and the D flag is set to 1.




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3.2.  Deprecated Network Prefix Request in Router Advertisements

   A new flag is defined to request the deprecated network prefix
   information in a router solicitation message.

    8 9 0 1 2 3 4 5
   +-+-+-+-+-+-+-+-+
   |M|O|D|Reserved |
   +-+-+-+-+-+-+-+-+

   D: 1-bit "Deprecated network prefix" flag.  It indicates that the
   deprecated network prefix of the mobile node is needed by an access
   router.

   When a mobile node receives the router advertisement message
   containing the D flag set to 1, the mobile node should respond with a
   router solicitation message carrying the prefix information option
   and with D flag set to 1 in the option.  In the prefix information
   option, the deprecated network prefix of the mobile node is
   contained.

   After the new access router learns the previous prefix of the
   specific mobile node, it updates the rule of ingress filter.
   Afterwards, the D flag in the following router advertisement message
   sent to this mobile node will be set to 0 and the mobile node will
   recognize that its previous prefix has been recorded by the access
   router.  Then the mobile node will not feedback with a router
   solicitation message.

   This extension is not supported by the access router if the D flag is
   not included in the router advertisement message and then the mobile
   node should not send a router solicitation message accordingly.

4.  Security Considerations

   TBD

5.  IANA Considerations

   TBD

6.  References

6.1.  Normative References







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   [RFC4861]  Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
              "Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
              DOI 10.17487/RFC4861, September 2007,
              <http://www.rfc-editor.org/info/rfc4861>.

6.2.  Informative References

   [Paper-Distributed.Mobility]
              Lee, J., Bonnin, J., Seite, P., and H. Chan, "Distributed
              IP Mobility Management from the Perspective of the IETF:
              Motivations, Requirements, Approaches, Comparison, and
              Challenges",  IEEE Wireless Communications, October 2013.

   [RFC7333]  Chan, H., Ed., Liu, D., Seite, P., Yokota, H., and J.
              Korhonen, "Requirements for Distributed Mobility
              Management", RFC 7333, DOI 10.17487/RFC7333, August 2014,
              <http://www.rfc-editor.org/info/rfc7333>.

Authors' Addresses

   Jong-Hyouk Lee
   Sangmyung University
   31, Sangmyeongdae-gil, Dongnam-gu
   Cheonan 31066
   Republic of Korea

   Email: jonghyouk@smu.ac.kr


   Zhiwei Yan
   CNNIC
   No.4 South 4th Street, Zhongguancun
   Beijing 100190
   China

   Email: yanzhiwei@cnnic.cn















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