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
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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
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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-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.
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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 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,
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<http://www.apnic.net/policy/proposals/
prop-058-v001.html>.
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
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Hiroyuki Ashida
its communications Inc.
3-5-7 Hisamoto Takatsu-ku Kawasaki-shi
Kanagawa 213-0011
Japan
Email: ashida@itscom.ad.jp
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