http://www.rfc-editor.org/rfc/rfc3122.txt
RFC 3122: Extensions to IPv6 Neighbor Discovery for Inverse Discovery Specification, A. Conta2001-06-01T23:00:00-00:00This memo describes extensions to the IPv6 Neighbor Discovery that allow a node to determine and advertise an IPv6 address corresponding to a given link-layer address. [STANDARDS-TRACK]