IANA-Reserved IPv4 Prefix for Shared Address Space
RFC 6598
Document | Type |
RFC - Best Current Practice
(April 2012; No errata)
Updates RFC 5735
Was draft-weil-shared-transition-space-request (individual in ops area)
|
|
---|---|---|---|
Authors | Jason Weil , Victor Kuarsingh , Chris Donley , Christopher Liljenstolpe , Marla Azinger | ||
Last updated | 2018-12-20 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6598 (Best Current Practice) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Ron Bonica | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) J. Weil Request for Comments: 6598 Time Warner Cable BCP: 153 V. Kuarsingh Updates: 5735 Rogers Communications Category: Best Current Practice C. Donley ISSN: 2070-1721 CableLabs C. Liljenstolpe Telstra Corp. M. Azinger Frontier Communications April 2012 IANA-Reserved IPv4 Prefix for Shared Address Space Abstract This document requests the allocation of an IPv4 /10 address block to be used as Shared Address Space to accommodate the needs of Carrier- Grade NAT (CGN) devices. It is anticipated that Service Providers will use this Shared Address Space to number the interfaces that connect CGN devices to Customer Premises Equipment (CPE). Shared Address Space is distinct from RFC 1918 private address space because it is intended for use on Service Provider networks. However, it may be used in a manner similar to RFC 1918 private address space on routing equipment that is able to do address translation across router interfaces when the addresses are identical on two different interfaces. Details are provided in the text of this document. This document details the allocation of an additional special-use IPv4 address block and updates RFC 5735. Status of This Memo This memo documents an Internet Best Current Practice. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on BCPs is available in Section 2 of RFC 5741. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc6598. Weil, et al. Best Current Practice [Page 1] RFC 6598 Shared Address Space Request April 2012 IESG Note A number of operators have expressed a need for the special-purpose IPv4 address allocation described by this document. During deliberations, the IETF community demonstrated very rough consensus in favor of the allocation. While operational expedients, including the special-purpose address allocation described in this document, may help solve a short-term operational problem, the IESG and the IETF remain committed to the deployment of IPv6. Copyright Notice Copyright (c) 2012 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. 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. Requirements Language ...........................................3 3. Alternatives to Shared Address Space ............................3 4. Use of Shared CGN Space .........................................4 5. Risk ............................................................5 5.1. Analysis ...................................................5 5.2. Empirical Data .............................................6 6. Security Considerations .........................................7 7. IANA Considerations .............................................8 8. References ......................................................8 8.1. Normative References .......................................8 8.2. Informative References .....................................9 Appendix A. Acknowledgments .......................................10 Weil, et al. Best Current Practice [Page 2] RFC 6598 Shared Address Space Request April 2012 1. Introduction IPv4 address space is nearly exhausted. However, ISPs must continue to support IPv4 growth until IPv6 is fully deployed. To that end, many ISPs will deploy a Carrier-Grade NAT (CGN) device, such as thatShow full document text