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.

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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.

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Table of Contents

• 1. Introduction
• 2. ISP Shared Address
• 2.1. Definition
• 2.2. Details
• 3. Size of Address Space
• 4. Acknowledgements
• 5. IANA Considerations
• 6. Security Considerations
• 7. References
• 7.1. Normative References
• 7.2. Informative References
• Authors' Addresses

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.

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

7.2. Informative References

Authors' Addresses