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Versions: 00 01                                                         
autoconf Working Group                                    Jaehwoon Lee
Internet Draft                                      Dongguk University
Expires: April 29, 2009                                   Sanghynn Ahn
                                                   University of Seoul
                                                          Younghan Kim
                                                   Soongsil University
                                                            Yuseon Kim
                                                           Sangeon Kim
                                                                    KT
                                                      October 30, 2008


        Scope-Extended Router Advertisement for Connected MANETs
                   draft-jaehwoon-autoconf-sera-01.txt


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   This Internet-Draft will expire on April 29, 2009.

Copyright Notice

   Copyright (C) The IETF Trust (2008).






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Abstract

   In the connected MANET, the MANET Border Router (MBR) is used to
   connect the MANET with the external network and MANET nodes are
   required to know the MBR address to communicate with hosts in the
   external network. One way of acquiring the MBR address is to use the
   Router Advertisement (RA) and the Router Solicitation (RS) messages.
   In order to allow RA/RS messages to be delivered in the multi-hop
   MANET, the modified RA/RS message has been defined [4]. However,
   this approach may incur the duplicate packet reception problem due
   to rebroadcasting of received RA/RS messages to its neighbors.
   In this draft, we define the scope-extended Router Advertisement/
   Solicitation message for announcing/solicitating the MBR address in
   the connected MANET. In the scope-extended RA/RS message, a new
   message field, the sequence number field, is defined so that
   duplicate RA/RS messages can be detected based on the sequence
   number and the MBR address included in the message.



Table of Contents


   1. Introduction..................................................3
   2. Terminology...................................................3
   3. Message Format................................................4
      3.1 IPv4......................................................4
          3.1.1 ICMP Scope-Extended Router Solicitation Message.....4
          3.1.2 ICMP Scope-Extended Router Advertisement Message....5
      3.2 IPv6......................................................6
          3.2.1 ICMP Scope-Extended Router Solicitation Message.....6
          3.2.2 ICMP Scope-Extended Router Advertisement Message....8
      3.3 Source Manet Address Option...............................9
   4. Security Considerations.......................................9
   5. IANA Considerations...........................................10
   References.......................................................10
   Author's Addresses...............................................10
   Intellectual Property and Copyright Statements ..................12








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1. Introduction

   The mobile ad hoc network (MANET) enabls mobile nodes to communicate
   cia multiple wireless hops without the need of any wired
   infrastructure[1]. in a MANET, two nodes not within their
   transmission range have to deliver data to each other through other
   intermediate nodes. For forwarding packets destined to other nodes,
   each node mush have the routing capability, i.e., the mechanism for
   establishing data delivery routes between any pair of source and
   destination nodes, as well as acting as a source and/or a destination
   node(s). In addition to that, the IP address auto-configuration
   mechanism suitable for the MANET environment is required.

   The MANET ca be classified into the autonomous MANET and the
   subordinate MANET. For the subordinate MANET, the MANET Border Router
   (MBR) which acts as the gateway connecting the MANET with the
   Internet has been defined. Through the MBR, MANET nodes can
   communicate with hosts located in the Internet. Therefore, MANET
   nodes have to know the MBR address. Moreover IP address assigned to
   the MANET node should be suitable to the Internet topology.
   In other words, nodes within the MANET should have the IP address
   with the same network prefix.

   One way of obtaing the MBR address and network prefix is to use the
   Router Advertisement (RA) and Router Solicitation (RS) messages[2-3].
   However, there RA and RS messages are delivered only upto 1 hop, so
   can not be used in a multi-hop wireless networks such as the MANET.
   In order to overcome this limitation, the modified RA message has
   been defined for the multi-hop wireless MANET[4]. However, in this
   approach, the duplicate packet reception problem can occur since,
   if a node broadcasts a RA/RS message, it can receive the same RA/RS
   message which was re-broadcasted by one of its neighbors.

   In this draft, we define the scope-extended Router Advertisement/
   Solicitation message for announcing/solicitating the MBR address in
   the connected MANET. In the scope-extended RA/RS message, a new
   message field, the sequence number field, is defined so that
   duplicate RA/RS messages can be detected based on the sequence
   number and the IP address included in the message.


2. Terminology

   No new terminology is defined in this draft.


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3. Message Format

3.1 IPv4

   In IPv4, the scope-extended router solicitation/advertisement
   information is included in the ICMP message [2].

3.1.1 ICMP Scope-Extended Router Solicitation Message


       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Type      |     Code      |           Checksum            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Sequence Number| Cur hop limit |         Reserved              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                        Originator Address                     |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   IP Fields:

      Source Address        The IP address configured at the MANET
                                              interface of the MANET router (MR) sending
                                              this message.

      Destination Address   224.0.0.1 or 255.255.255.255

      Time-to-Live          1


   ICMP Fields:

      Type                  TBD

      Code                  0

      Sequence Number         This number is increased by 1 whenever the
                            originating MR sends a scope-extended RS
                            message. The sequence number and the
                            originator address (see below) are used for
                            the message duplication check.



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      Cur Hop Limit                   Initially set to 255. An intermediate route
                            reduces this value by 1 before
                            rebroadcasting it. If the reduced value is
                            0, this message is silently discarded.

      Reserved              Sent as 0; ignored on reception.

      Originator Address    The IP address assigned to the MANET
                                              interface of the MR that originates the
                                              message.

3.1.2 ICMP Scope-Extended Router Advertisement Message

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Type      |     Code      |           Checksum            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Sequence Number| Cur Hop Limit | Prefix Length |   Reserved    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |   Reserved                    |           Lifetime            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                          MBR Address                          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   IP Fields:

      Source Address        The IP address configured at the MANET
                            interface of the MR sending this message.
                                              If this message is sent as a reply to a
                                              scope-extended RS message, this field has
                                              the IP address configured at the MANET
                                              interface of the MBR originating this
                                              scope-extended RA message. If it is a
                                              proactively sent message, this field has the
                                              IP address configured at the MANET interface
                                              of the MR sending this message.

      Destination Address   The IP address of the MANET interface of the
                            MR originating the scope-extended RS message,
                            if this scope-extended RA message is sent as
                            a reply to the scope-extended RS message.
                            Otherwise, set to the broadcast address.


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      Time-to-Live          1 if the Destination Address is the
                            broadcast address; at least 1, otherwise.


   ICMP Fields:

      Type                  TBD

      Code                  0

      Sequence Number         If this message is sent as a reply to a
                            scope-extended RS message, this field is
                            set to the Sequence Number in the scope-
                            extended RS message. Otherwise, i.e., if
                            this message is sent proactively, the value
                            of this field is increased by 1 by the MBR.
                            The sequence number and the MBR address are
                            used for the message duplication check.

      Cur hop limit                   Initially set to 255. An intermediate route
                            reduces this value by 1 before
                            rebroadcasting it. If the reduced value is
                            0, this message is silently discarded.

      Prefix Length             The prefix length of the IPv4 address
                            assigned to the MANET interface of the MBR.


      MBR Address           The IP address assigned to the MANET inter-
                            face of the MBR originating this message.

3.2 IPv6

   In IPv6, the scope-extended router solicitation/advertisement
   information is defined as a part of the neighbor discovery in [3].


3.2.1 ICMP Scope-Extended Router Solicitation Message








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       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Type      |     Code      |           Checksum            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Sequence Number| Cur Hop Limit |         Reserved              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      |                    Originator Address                         |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   IP Fields:

      Source Address        The IP address configured at the MANET
                                              interface of the MR sending this message.

      Destination Address   The all-routers multicast address or the
                            all-nodes multicast address.

      Time-to-Live          1


   ICMP Fields:

      Type                  TBD

      Code                  0

      Sequence Number         This number is increased by 1 whenever the
                            originating MR sends a RS message. The
                            sequence number and the originator address
                            are used for the message duplication check.

      Cur Hop Limit                   Initially set to 255. An intermediate route
                            reduces this value by 1 before
                            rebroadcasting it. If the reduced value is
                            0, this message is silently discarded.

      Originator Address    The IP address assigned to the MANET
                            interface of the MR originating the message.


3.2.2 ICMP Scope-Extended Router Advertisement Message


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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Type      |     Code      |          Checksum             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Sequence Number| Prefix Length |          Reserved             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | Cur Hop Limit |M|O| Reserved  |       Router Lifetime         |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                         Reachable Time                        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                          Retrans Timer                        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                                                               |
     |                          MBR Address                          |
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   IP Fields:

      Source Address        If this message is sent as a reply to a
                            scope-extended RS message, this field has
                            the IP address configured at the MANET
                            interface of the MBR originating this
                            message. If this messages is a proactively
                            sent message, this field has the IP address
                            configured at the MANET interface of the MR
                            sending this message.

      Destination Address   Typically the Source Address of the invoking
                            scope-extended Router Solicitation or the
                            all-nodes multicast address.

      Hop Limit      1      if the Destination Address is the
                            all-routers multicast address or the
                            all-nodes multicast address;
                            at least 1, otherwise.


   ICMP Fields:

      Type           TBD

      Code           0


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      Sequence Number         If this message is sent as a reply to a
                            scope-extended RS message, this field is
                            set to the Sequence Number in the scope-
                            extended RS message. Otherwise, i.e., if
                            this message is sent proactively, the value
                            of this field is increased by 1 by the MBR.
                            The sequence number and the MBR address are
                            used for the message duplication check.

      Prefix Length             The prefix length of the IPv6 address
                            assigned to the MANET interface of the MBR.

      Cur Hop Limit                   Initially set to 255. An intermediate route
                            reduces this value by 1 before
                            rebroadcasting it. If the reduced value is
                            0, this message is silently discarded.

      MBR Address           The IPv6 address configured at the MANET
                            interface of the MBR originating this
                            message.



4. Security Consideration

   There is no special security considerations in this draft.


5. IANA Considerations

   This draft document defines a new type in the ICMP message. An Type
   value for the scope-extended Router Discovery message for MANET must
   be assigned by IANA.


References

   [1] E. Baccelli, "Address Autoconfiguration for MANET: Terminology
       and Problem Statement", draft-ietf-autoconf-statement-04,
       Work in progress, Feb. 2008.

   [2] S. Deering, "ICMP Router Discovery Messages", RFC 1256,
       Sep. 1991.



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   [3] T. Narten, E. Nordmark, W. Simpson and H. Soliman, "Neighbor
       Discovery for IP version 6 (IPv6)", RFC 3861, Sep. 2007.

   [4] R. Wakikawa, J. Malinen, C. Perkins, A. NIlsson and A. Tuominen,
       Global connectivity for IPv6 Mobile Ad Hoc Networks", Work in
       progress, Oct. 2003.


Author's Addresses

   Jaehwoon Lee
   Dongguk University
   26, 3-ga Pil-dong, Chung-gu
   Seoul 100-715, KOREA
   Email: jaehwoon@dongguk.edu

   Sanghyun Ahn
   University of Seoul
   90, Cheonnong-dong, Tongdaemun-gu
   Seoul 130-743, KOREA
   Email: ahn@uos.ac.kr

   Younghan Kim
   Soongsil University
   11F Hyungnam Engineering Bldg. 317, Sangdo-Dong,
   Dongjak-Gu, Seoul 156-743 Korea
   E-main: yhkim@dcn.ssu.ac.kr

   Yuseon Kim
   KT
   17 Woomyeon-dong, Seocho-gu
   Seoul 137-792, KOREA
   Email: yseonkim@kt.co.kr

   Sangeon Kim
   KT
   17 Woomyeon-dong, Seocho-gu
   Seoul 137-792, KOREA
   Email: sekim@kt.co.kr







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Full Copyright Statement

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