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Internet Engineering Task Force                              I. Yamagata
Internet-Draft                                               S. Miyakawa
Intended status: BCP                                  NTT Communications
Expires: January 12, 2012                                    A. Nakagawa
                                          Japan Internet Exchange (JPIX)
                                                            J. Yamaguchi
                                                                     IIJ
                                                               H. Ashida
                                                                  iTSCOM
                                                           July 11, 2011


                           ISP Shared Address
                   draft-shirasaki-isp-shared-addr-06

Abstract

   This document defines IPv4 ISP Shared Address to be jointly used
   among Internet Service Providers (ISPs).  This space is intended to
   be used in NAT444 model which is used during the transition period to
   IPv6.

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 January 12, 2012.

Copyright Notice

   Copyright (c) 2011 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
   2.  ISP Shared Address  . . . . . . . . . . . . . . . . . . . . . . 3
     2.1.  Definition  . . . . . . . . . . . . . . . . . . . . . . . . 3
     2.2.  Details . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  Size of Address Space . . . . . . . . . . . . . . . . . . . . . 4
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     7.1.  Normative References  . . . . . . . . . . . . . . . . . . . 4
     7.2.  Informative References  . . . . . . . . . . . . . . . . . . 5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 5






























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1.  Introduction

   The only permanent solution of the IPv4 address exhaustion is to
   deploy IPv6.  Now, just before the exhaustion, it's time to make a
   transition to IPv6.

   NAT444 model [I-D.shirasaki-nat444] is one of the solutions for
   transition to IPv6.

   This document defines ISP Shared Address to be used in NAT444 model
   [I-D.shirasaki-nat444-isp-shared-addr].  It is supposed to be used
   between Customer Premises Equipment (CPE) and Carrier Grade NAT (CGN)
   [I-D.nishitani-cgn].

   ISP Shared Address is needed until the IPv4 Internet fades out.


2.  ISP Shared Address

2.1.  Definition

   ISP Shared Address is intended to be assigned between CPE and CGN in
   a NAT444.

2.2.  Details

   - Each ISP can use ISP Shared Address without any coordination with
   IANA or Internet registries.

   - ISP Shared Address can be used by many ISPs.

   - ISP has to install CGN to use ISP Shared Address.

   - ISP Shared Address must not be used at customers' site or Internet
   Exchanges.

   - Routing information of ISP Shared Address must not be advertised to
   the Internet.

   - Reverse DNS queries for this address space must not be sent to root
   DNS servers.

   - Packets with this space as source address and/or destination
   address must be filtered out at the border of each ISP.

   - Addresses within this address space should be unique within the
   ISP, or the set of ISPs which choose to cooperate over this space so
   they may directly communicate with each other in their networks.



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3.  Size of Address Space

   Because the aggregation size of Tokyo area POP is around /10 in
   Japan, /10 should be the hard limit of minimum size ISP Shared
   Address.  We understand this can be determined by further
   discussions.


4.  Acknowledgements

   Thanks for the input and review by Shirou Niinobe, Takeshi Tomochika,
   Tomohiro Fujisaki, Dai Nishino, JP address community members, AP
   address community members and JPNIC members.


5.  IANA Considerations

   IANA is to record the allocation of the IPv4 global unicast address
   as ISP Shared Address in the IPv4 address registry.


6.  Security Considerations

   ISP Shared Address is supposed to be used with CGN.  The Global IPv4
   address that is assigned outside CGN may be used as source address of
   'Denial of Service' attack.


7.  References

7.1.  Normative References

   [I-D.nishitani-cgn]
              Yamagata, I., Miyakawa, S., Nakagawa, A., and H. Ashida,
              "Common requirements for IP address sharing schemes",
              draft-nishitani-cgn-05 (work in progress), July 2010.

   [I-D.shirasaki-nat444-isp-shared-addr]
              Shirasaki, Y., Miyakawa, S., Nakagawa, A., Yamaguchi, J.,
              and H. Ashida, "NAT444 addressing models",
              draft-shirasaki-nat444-isp-shared-addr-05 (work in
              progress), January 2011.

   [I-D.shirasaki-nat444]
              Yamagata, I., Shirasaki, Y., Nakagawa, A., Yamaguchi, J.,
              and H. Ashida, "NAT444", draft-shirasaki-nat444-03 (work
              in progress), January 2011.




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7.2.  Informative References

   [PROP58]   Niinobe, S., Tomochika, T., Yamaguchi, J., Nishino, D.,
              Ashida, H., Nakagawa, A., and T. Hosaka, "Proposal to
              create IPv4 shared use address space among LIRs", 2008,
              <http://www.apnic.net/policy/proposals/
              prop-058-v001.html>.


Authors' Addresses

   Ikuhei Yamagata
   NTT Communications Corporation
   Gran Park Tower 17F, 3-4-1 Shibaura, Minato-ku
   Tokyo  108-8118
   Japan

   Phone: +81 3 6700 8530
   Email: ikuhei@nttv6.jp


   Shin Miyakawa
   NTT Communications Corporation
   Gran Park Tower 17F, 3-4-1 Shibaura, Minato-ku
   Tokyo  108-8118
   Japan

   Phone: +81 50 3812 4695
   Email: miyakawa@nttv6.jp


   Akira Nakagawa
   Japan Internet Exchange Co., Ltd. (JPIX)
   Otemachi Building 21F, 1-8-1 Otemachi, Chiyoda-ku
   Tokyo  100-0004
   Japan

   Phone: +81 90 9242 2717
   Email: a-nakagawa@jpix.ad.jp












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   Jiro Yamaguchi
   Internet Initiative Japan Inc.
   Kakyoin Square Bldg., 15F, 1-1-20 Kakyoin, Aoba-ku
   Sendai  980-0013
   Japan

   Phone: +81 22 216 5650
   Email: jiro-y@iij.ad.jp


   Hiroyuki Ashida
   its communications Inc.
   541-1 Ichigao-cho Aoba-ku
   Yokohama  225-0024
   Japan

   Email: ashida@itscom.ad.jp


































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