Recommendation on Stable IPv6 Interface Identifiers

The information below is for an old version of the document
Document Type None Internet-Draft (6man WG)
Last updated 2015-01-23
Stream IETF
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Expired & archived
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The IPv6 addressing architecture defines Modified EUI-64 format Interface Identifiers, and the existing IPv6 over various link-layers specify how such identifiers are derived from the underlying link- layer address (e.g., an IEEE LAN MAC address) when employing IPv6 Stateless Address Autoconfiguration (SLAAC). The security and privacy implications of embedding link-layer addresses in the Interface Identifier have been known and understood for some time now, and some popular IPv6 implementations have already deviated from such schemes to mitigate these issues. This document changes the recommended default Interface Identifier generation scheme to that specified in RFC7217, and recommends against embedding link-layer addresses in IPv6 Interface Identifiers. It formally updates RFC2464, RFC2467, RFC2470, RFC2491, RFC2492, RFC2497, RFC2590, RFC3146, RFC3572, RFC4291, RFC4338, RFC4391, RFC4944, RFC5072, and RFC5121, which require IPv6 Interface Identifiers to be derived from the underlying link-layer address.


Fernando Gont (
Alissa Cooper (
Dave Thaler (
Will LIU (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)