Value,Description,Reference 0,NAI is absent.,[RFC8664] 1,NAI is an IPv4 node ID.,[RFC8664] 2,NAI is an IPv6 node ID.,[RFC8664] 3,NAI is an IPv4 adjacency.,[RFC8664] 4,NAI is an IPv6 adjacency with global IPv6 addresses.,[RFC8664] 5,NAI is an unnumbered adjacency with IPv4 node IDs.,[RFC8664] 6,NAI is an IPv6 adjacency with link-local IPv6 addresses.,[RFC8664] 7-15,Unassigned,