Internet DRAFT - draft-ahn-autoconf-addresspool

draft-ahn-autoconf-addresspool



AUTOCONF Working Group                                      Sanghyun Ahn 
Internet Draft                                       University of Seoul 
Expires: January 4, 2011                                       Yujin Lim 
                                                     University of Suwon 
                                                            July 3, 2010 

                                     
               MANET Address Configurtion using Address Pool 
                   draft-ahn-autoconf-addresspool-01.txt 

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.  This document may not be modified,
   and derivative works of it may not be created, except to format it
   for publication as an RFC or to translate it into languages other
   than English.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   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."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on January 4, 2011.

Copyright Notice

   Copyright (c) 2010 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 to this document.





Ahn, et al.              Expires January 4, 2011                [Page 1]

Internet-Draft  MANET Address Configuration using Address Pool July 2010


Abstract

   This document describes an address configuration mechanism based on
   the concept of address pool allocation in the connected MANET.
   The Internet gateway acts as a DHCP (Dynamic Host Configuration
   Protocol) server and assigns not a single address but a part of its
   address pool to an address requesting node and, then, the node can
   assign a part of its own address pool to its neighbor nodes.
   By doing this, the address allocation procedure can be expedited.

Table of Contents

   1.  Requirements notation  . . . . . . . . . . . . . . . . . . . .  3 
   2.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   4.  Address Pool based MANET Address Configuration . . . . . . . .  3
   5.  Message Format . . . . . . . . . . . . . . . . . . . . . . . .  4
       5.1  Address Pool Release Request (APRR) message . . . . . . .  4
       5.2  Address Pool Release Reply (APRP) message . . . . . . . .  4
       5.3  DHCP Options  . . . . . . . . . . . . . . . . . . . . . .  5
   6.  Other Considerations . . . . . . . . . . . . . . . . . . . . .  5
   References . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  6




























Ahn, et al.              Expires January 4, 2011                [Page 2]

Internet-Draft  MANET Address Configuration using Address Pool July 2010
        

1.  Requirements notation

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

   
2.  Introduction

   The MANET can be classified into the standalone MANET and the
   connected MANET [1]. The conntected MANET allows a MANET node to
   communicate with global Internet nodes via the Internet gateway
   (IGW). In order for a MANET node to communicate with a node in the
   external global Internet, the MANET node has to obtain a globally
   unique IP address. In the wireless multi-hop communication
   environment, the mechanism using the IGW as the centralized DHCP
   (Dynamic Host Configuration Protocol) [2] server is not desirable
   since it may incur long address allocation delay.
 
   In this draft, we describe an address configuration mechanism that
   allows stable and fast global IP address allocation based on the DHCP
   mechanism in the connected MANET. In the proposed scheme, the IGW
   acts as a DHCP server and allocates a part of its address pool to
   an address requesting node. Now, the node with the allocated address
   pool can act a DHCP server and allocate a part of its address pool
   to the other address requesting nodes.

  
3.  Terminology

   Address Pool     A range of addresses starting from LOW to HIGH.
      

4.  Address Pool based MANET Address Configuration

   The IGW periodically broadcasts Router Advertisement (RA) messages to
   the entire MANET and the MANET node receiving the RA message can
   request for addresses to the IGW by unicasting a DHCP_Request [2]
   message. Any intermediate node receiving the DHCP_Request message
   intercepts the message and allocates a part of its address pool in
   lieu of the IGW if its address pool is big enough to allocate by
   unicasting a DHCP_Reply message to the address requesting node.
   Otherwise, it forwards the DHCP_Request message to the IGW. Once the
   IGW receives the DHCP_Request message, the IGW allocates a part of
   its address pool to the addres requesting node by sending a
   DHCP_Reply message.

   The node with the allocated address pool assigns one address to its
   interface and keeps the rest of its address pool for later


Ahn, et al.              Expires January 4, 2011                [Page 3]

Internet-Draft  MANET Address Configuration using Address Pool July 2010


   allocation to other MANET nodes requesting addresses.

   In order to avoid the renewal of the allocated address pool, the
   valid-lifetime field in the DHCP_Reply message is set to
   '0xffffffff' (that is, infinite use of the address pool). If the size
   of the address pool of the IGW reaches below a pre-specified
   threshold, the IGW broadcasts an Address Pool Release Request (APRR)
   message to the entire MANET. The MANET node receiving the APRR
   message sends an Address Pool Release Reply (APRP) message to let
   the IGW know those addresses already being used or assigned by the
   APRP message sent node.


5. Message Format


5.1  Address Pool Release Request (APRR) message

   This message is broadcast by the IGW to the entire MANET in order to
   request for the list of addresses used by MANET nodes.

      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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   OPTION_ADDPOOL_RELEASE_REQUEST(24)|          option-len           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                         APRR-options                          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


5.2  Address Pool Release Reply (APRP) message

   This message is unicast by a MANET node to the IGW in order to give
   the list of addresses used by the MANET node.

      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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     OPTION_ADDPOOL_RELEASE_REPLY(24)|          option-len           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                         used address                          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                         APRP-options                          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+







Ahn, et al.              Expires January 4, 2011                [Page 4]

Internet-Draft  MANET Address Configuration using Address Pool July 2010


5.3  DHCP options

   The OPTION_ADDRSS_POOL_REQUEST option is defined to allow a MANET
   node to request for an address pool to the DHCP server. This option
   is included in the DHCP_Request message [2] as shown in the
   following figure.

      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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |         OPTION_ORD(6)         |          option-len           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |OPTION_ADDRESS_POOL_REQUEST(21)|    requested-option-code-2    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              ...                              |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
   The OPTION_IAADDPOOL option is defined to allow the DHCP server to
   to allocate an address pool to the address pool request MANET node.
   This option is included in the DHCP_Reply message [2] as shown in
   the following figure.

      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
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     OPTION_IAADDPOOL(22)      |          option-len           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                    lowest IPv6 address(LOW)                   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                   highest IPv6 address(HIGH)                  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                       preferred-lifetime                      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                         valid-lifetime                        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                       IA_ADDPOOL-options                      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


6. Other Considerations

   TBD.









Ahn, et al.              Expires January 4, 2011                [Page 5]

Internet-Draft  MANET Address Configuration using Address Pool July 2010


References

   [1] E. Baccelli, "Address Autoconfiguration for MANET: Terminology
       and Problem Statement," draft-ietf-autoconf-statement-04.txt,
       Feb. 2008.
   [2] R. Droms, J. Bound, B. Volz, T. Lemon, C. Perkins and M. Carnery,
       "Dynamic Host Configuration Protocol for IPv6(DHCPv6)," RFC 3315,
       July 2003.
              

Authors' Addresses

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

   Yujin Lim
   University of Suwon
   San 2-2, Wau-ri, Bongdam-eup
   Hwaseong-si, Gyeonggi-do, 445-743
   Korea
   Email: yujin@suwon.ac.kr


























Ahn, et al.              Expires January 4, 2011                [Page 6]