Recommendation on Stable IPv6 Interface Identifiers

This document changes the recommended default IID generation scheme for cases where SLAAC is used to generate a stable IPv6 address. It recommends using the mechanism specified in RFC7217 in such cases, and recommends against embedding stable link-layer addresses in IPv6 Interface Identifiers. It formally updates RFC2464, RFC2467, RFC2470, RFC2491, RFC2492, RFC2497, RFC2590, RFC3146, RFC3572, RFC4291, RFC4338, RFC4391, RFC5072, and RFC5121. This document does not change any existing recommendations concerning the use of temporary addresses as specified in RFC 4941.