RFC-Defined DHCPV6 Option Numbers

Option Number	Name	Description
12	Server Unicast	Hostname string, such as (Server Unicast)
21	SIP Servers Domain Name List	Enables listing of SIP Servers domain names
22	SIP Servers IPv6 Address List	Enables listing of SIP Servers IPv6 Addresses
23	DNS Recursive Name Server	Enables listing of DNS Recursive Name servers
24	Domain Search List	Enables listing of domain names for searching
27	Network Information Service (NIS) Servers	Enables listing of Network Information Service (NIS) servers
28	Network Information Service V2 (NIS+) Servers	Enables listing of Network Information Service V2 (NIS+) servers
29	Network Information Service (NIS) Domain Name	Enables listing of Network Information Service (NIS) domain names
30	Network Information Service V2 (NIS+) Domain Name	Enables listing of Network Information Service V2 (NIS+) domain names
31	Simple Network Time Protocol (SNTP) Servers	Enables listing of Simple Network Time Protocol (SNTP) servers
32	Information Refresh Time	Information refresh time