The U and G bits in IPv6 Interface Identifiers
Univ. of Auckland
Huawei Technologies Co., Ltd
The IPv6 addressing architecture 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 the status of those bits for interface identifiers that are not derived from an IEEE link-layer address, and updates RFC 4291 accordingly.