Issues Associated with Designating Additional Private IPv4 Address Space
RFC 6319
Document | Type |
RFC - Informational
(July 2011; No errata)
Was draft-azinger-additional-private-ipv4-space-issues (individual in ops area)
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Authors | Marla Azinger , Leo Vegoda | ||
Last updated | 2018-12-20 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6319 (Informational) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Ron Bonica | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) M. Azinger Request for Comments: 6319 Frontier Communications Category: Informational Corporation ISSN: 2070-1721 L. Vegoda ICANN July 2011 Issues Associated with Designating Additional Private IPv4 Address Space Abstract When a private network or internetwork grows very large, it is sometimes not possible to address all interfaces using private IPv4 address space because there are not enough addresses. This document describes the problems faced by those networks, the available options, and the issues involved in assigning a new block of private IPv4 address space. While this informational document does not make a recommendation for action, it documents the issues surrounding the various options that have been considered. Status of This Memo This document is not an Internet Standards Track specification; it is published for informational purposes. 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). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see 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/rfc6319. Azinger & Vegoda Informational [Page 1] RFC 6319 Additional Private IPv4 July 2011 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 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. Large Networks . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Non-Unique Addresses . . . . . . . . . . . . . . . . . . . . . 3 3.1. Subscriber Use Network Address Translation . . . . . . . . 3 3.2. Carrier-Grade Network Address Translation . . . . . . . . 4 4. Available Options . . . . . . . . . . . . . . . . . . . . . . 4 4.1. IPv6 Options . . . . . . . . . . . . . . . . . . . . . . . 4 4.1.1. Unique Globally Scoped IPv6 Unicast Addresses . . . . 4 4.1.2. Unique Local IPv6 Unicast Addresses . . . . . . . . . 5 4.2. IPv4 Options . . . . . . . . . . . . . . . . . . . . . . . 5 4.2.1. Address Transfers or Leases from Organizations with Available Address Space . . . . . . . . . . . . . 5 4.2.2. Using Unannounced Address Space Allocated to Another Organization . . . . . . . . . . . . . . . . . 5 4.2.3. Unique IPv4 Space Registered by an RIR . . . . . . . . 6 5. Options and Consequences for Defining New Private Use Space . 6 5.1. Redefining Existing Unicast Space as Private Address Space . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5.2. Unique IPv4 Space Shared by a Group of Operators . . . . . 7 5.3. Potential Consequences of Not Redefining Existing Unicast Space as Private Address Space . . . . . . . . . . 8 5.4. Redefining Future Use Space as Unicast Address Space . . . 8 6. Security Considerations . . . . . . . . . . . . . . . . . . . 8 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.1. Normative References . . . . . . . . . . . . . . . . . . . 9 7.2. Informative References . . . . . . . . . . . . . . . . . . 9 Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . . 12 Azinger & Vegoda Informational [Page 2] RFC 6319 Additional Private IPv4 July 2011 1. Introduction [RFC1918] sets aside three blocks of IPv4 address space for use in private networks: 192.168.0.0/16, 172.16.0.0/12 and 10.0.0.0/8. These blocks can be used simultaneously in multiple, separately managed networks without registration or coordination with IANA orShow full document text