Value,Protocol,Reference
0,DHCPv4 Configuration Token,"[RFC3118, Section 4]"
1,DHCPv4 Delayed Authentication,"[RFC3118, Section 5]"
2,DHCPv6 Delayed Authentication (Obsolete),[RFC-ietf-dhc-rfc8415bis-12]
3,DHCPv6 Reconfigure Key Authentication,[RFC-ietf-dhc-rfc8415bis-12]
4-254,Unassigned,
255,Reserved,[RFC3118]