Network Working Group O. DeLong Internet-Draft DeLong Consulting Category: Informational March 2013 ULA IPv6 Address Prefix Reserved for Documentation draft-delong-ula-example-00 Status of this Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Abstract To reduce the likelihood of conflict and confusion when relating documented examples to deployed systems, an IPv6 Unicast Address prefix is reserved for use in examples in RFCs, books, documentation, and the like. Since the publication of [RFC 4193] (ULA), it is necessary to provide examples of ULA addresses in various documents, including some Internet-Drafts currently under consideration. This draft seeks to add ULA prefixes reserved for documentation purposes similar to the GUA reservation specified in [RFC3489] Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. 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." This Internet-Draft will expire on September 29, 2013. DeLong Informational [Page 1] Internet-Draft ULA Documentation Prefix March 2013 Copyright Notice Copyright (c) 2013 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.....................................................2 2. Acknowledgements.................................................2 3. Documentation IPv6 Unique Local Address Prefix...................3 4. Operational Implications.........................................3 5. IANA Considerations..............................................3 6. Security Considerations..........................................3 7. References.......................................................4 7.1. Normative References.........................................4 7.2. Informative References.......................................4 Authors' Addresses..................................................4 1. Introduction [RFC 4193] does not specify a ULA prefix to be used for documentation purposes. For the same reasons an IPv6 Global Unicast Prefix (GUA) is needed for documentation in [RFC 3849], there is also need for a ULA prefix. Whereas [RFC 3849] delegates 2001:db8::/32 to be used for documentation purposes where an IPv6 GUA prefix or address is needed, this memo proposes designating two /48s from ULA space for that purpose when an example of ULA is needed. 2. Acknowledgements This draft is a logical extension of the work in [RFC 3849] and I wish to thank and acknowledge the contributions of its authors Geoff Huston, Anne Lord, and Phil Smith. DeLong Informational [Page 2] Internet-Draft ULA Documentation Prefix March 2013 3. Documentation IPv6 ULA Prefix To allow documentation to accurately describe deployment examples, the use of site local or link local addresses is inappropriate, and a unicast address block is required. While there is Global Unicast space designated for Documentation in [RFC 3849], no such provision exists within the ULA prefix (fc00::/7) for either random (fd00::/8) or registered (fc00::/8). Since 2001:db8::/32 was designated for documentation purposes in [RFC 3849] and is widely and readily recognized as such throughout the networking community, this memo suggests the use of similar ranges within the ULA prefixes for that same purpose. The proposed prefixes are fc00:2001:db8::/48 (ULA Registered) and fd00:2001:db8::/48 (ULA Random), respectively. In the case of fc00:2001:db8::/48 this would serve only as a statement of intent until such time as the use of fc00::/8 is documented by the IETF. 4. Operational Implications This assignment implies that IPv6 network operators should not use these prefixes in their actual deployments of IPv6 ULA. Further it implies that these prefixes should be specifically filtered in any situation where overlapping ULA prefixes may be otherwise permitted by route or packet filters. This is not a local-use prefix, and the filters may be used in both local and public contexts, though in the public context, a more general filter of all ULA space (fc00::/7) may be more desirable. In general, the combination of the specific and more generic filter together should, while unnecessary, not have any harmful effects. 5. IANA Considerations IANA is to record the allocation of the IPv6 ULA prefixes fc00:2001:db8::/48 and fd00:2001:db8::/48 as additional documentation-only prefixes in the IPv6 address registry. No end party is to be assigned these addresses. 6. Security Considerations IPv6 addressing documents do not have any direct impact on Internet infrastructure security. DeLong Informational [Page 3] Internet-Draft ULA Documentation Prefix March 2013 7. References 7.1. Normative References [RFC3849] Huston, G., Lord, A., and Smith, P., "IPv6 Address Prefix Reserved for Documentation", RFC 3849, July 2004. 7.2. Informative References [RFC4193] Hinden, R. and Haberman, B., "Unique Local IPv6 Unicast Addresses", RFC 4193, October 2005. Authors' Addresses Owen DeLong DeLong Consulting EMail: owen@delong.com Full Copyright Statement Copyright (c) 2013 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. DeLong Informational [Page 3] Internet-Draft ULA Documentation Prefix March 2013 Acknowledgement Funding for the RFC Editor function is currently provided by the Internet Society.