Internet Engineering Task Force Y. Shirasaki, Ed. Internet-Draft S. Miyakawa Intended status: BCP NTT Communications Expires: March 11, 2010 A. Nakagawa KDDI CORPORATION J. Yamaguchi IIJ H. Ashida iTSCOM September 7, 2009 ISP Shared Address draft-shirasaki-isp-shared-addr-03 Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. 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 March 11, 2010. Copyright Notice Copyright (c) 2009 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 in effect on the date of publication of this document (http://trustee.ietf.org/license-info). Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Shirasaki, et al. Expires March 11, 2010 [Page 1] Internet-Draft ISP Shared Address September 2009 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. 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 . . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 5 Shirasaki, et al. Expires March 11, 2010 [Page 2] Internet-Draft ISP Shared Address September 2009 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-isp-shared-addr] is one of the solutions for transition to IPv6. This document defines ISP Shared Address to be used in NAT444 model. It is supposed to be used between Customer Premises Equipment (CPE) and Large Scale NAT (LSN) [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 LSN 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 LSN 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. Shirasaki, et al. Expires March 11, 2010 [Page 3] Internet-Draft ISP Shared Address September 2009 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 LSN. The Global IPv4 address that is assigned outside LSN may be used as source address of 'Denial of Service' attack. 7. References 7.1. Normative References [I-D.nishitani-cgn] Nishitani, T., Miyakawa, S., Nakagawa, A., and H. Ashida, "Common Functions of Large Scale NAT (LSN)", draft-nishitani-cgn-02 (work in progress), June 2009. [I-D.shirasaki-nat444-isp-shared-addr] Shirasaki, Y., Miyakawa, S., Nakagawa, A., Yamaguchi, J., and H. Ashida, "NAT444 with ISP Shared Address", draft-shirasaki-nat444-isp-shared-addr-01 (work in progress), March 2009. 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, Shirasaki, et al. Expires March 11, 2010 [Page 4] Internet-Draft ISP Shared Address September 2009 . Authors' Addresses Yasuhiro Shirasaki (editor) NTT Communications Corporation NTT Hibiya Bldg. 7F, 1-1-6 Uchisaiwai-cho, Chiyoda-ku Tokyo 100-8019 Japan Phone: +81 3 6700 8530 Email: yasuhiro@nttv6.jp Shin Miyakawa NTT Communications Corporation Gran Park Tower 17F, 3-4-1 Shibaura, Minato-ku Tokyo 108-8118 Japan Phone: +81 3 6733 8671 Email: miyakawa@nttv6.jp Akira Nakagawa KDDI CORPORATION GARDEN AIR TOWER, 3-10-10, Iidabashi, Chiyoda-ku Tokyo 102-8460 Japan Email: ai-nakagawa@kddi.com Jiro Yamaguchi Internet Initiative Japan Inc. Jinbocho Mitsui Bldg., 1-105 Kanda Jinbo-cho, Chiyoda-ku Tokyo 101-0051 Japan Phone: +81 3 5205 6500 Email: jiro-y@iij.ad.jp Shirasaki, et al. Expires March 11, 2010 [Page 5] Internet-Draft ISP Shared Address September 2009 Hiroyuki Ashida its communications Inc. 3-5-7 Hisamoto Takatsu-ku Kawasaki-shi Kanagawa 213-0011 Japan Email: ashida@itscom.ad.jp Shirasaki, et al. Expires March 11, 2010 [Page 6]