Significance of IPv6 Interface Identifiers (RFC7136)
Original Publication Date: 2014-Feb-01
Included in the Prior Art Database: 2014-Feb-12
Internet Society Requests For Comment (RFCs)
B. Carpenter: AUTHOR [+2]
IPv6 unicast addresses consist of a prefix followed by an Interface Identifier (IID). The IID is supposed to be unique on the links reached by routing to that prefix, giving an IPv6 address that is unique within the applicable scope (link local or global). According to the IPv6 addressing architecture [RFC4291], when a 64-bit IPv6 unicast IID is formed on the basis of an IEEE EUI-64 address, usually itself expanded from a 48-bit MAC address, a particular format must be used:
Internet Engineering Task Force (IETF) B. Carpenter Request for Comments: 7136 Univ. of Auckland Updates: 4291 S. Jiang Category: Standards Track Huawei Technologies Co., Ltd ISSN: 2070-1721 February 2014
Significance of IPv6 Interface Identifiers
The IPv6 addressing architecture includes a unicast interface identifier that is used in the creation of many IPv6 addresses. Interface identifiers are formed by a variety of methods. This document clarifies that the bits in an interface identifier have no meaning and that the entire identifier should be treated as an opaque value. In particular, RFC 4291 defines a method by which the Universal and Group bits of an IEEE link-layer address are mapped into an IPv6 unicast interface identifier. This document clarifies that those two bits are significant only in the process of deriving interface identifiers from an IEEE link-layer address, and it updates RFC 4291 accordingly.
Status of This Memo
This is an Internet Standards Track document.
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 Internet Standards 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/rfc7136.
Jiang Standards Track [Page 1]
RFC 7136 IPv6 IID Significance February 2014
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2...