Client Requested DHCPv6 Options

The following default options are encapsulated by the DHCPv6 client when requesting DHCPv6 server.

1. OPTION_CLIENTID (code 1). The Client Identifier option is used to carry a DUID identifying a client between a client and a server.
2. OPTION_SERVERID (code 2). The Server Identifier option is used to carry a DUID identifying a server between a client and a server.
   

   Note

   OPTION_SERVERID option is included if DHCPv6 client is responding to a particular server.
3. OPTION_IA_NA (code 3). The client uses IA_NA options to request the assignment of non-temporary address assignment.
4. OPTION_IAADDR (code 5). The IA_ADDR is used to specify the IPv6 addresses associated with IA_NA or IA_TA option.
   

   Note

   OPTION_IAADDR is included only if the client lease is present.
   

   Note

   IAID is the last 4 bytes of the hardware address
5. OPTION_ORO (code 6). The Option Request option is used to identify a list of options in a message between client and server. A client includes an Option Request option in a Solicit, Request, Renew, Rebind, Confirm or Information-request message to inform the server about options the client is interested in.

The following are the Default requested options included by the ExtremeXOS DHCPv6 client as part of Option Request Option (OPTION_ORO) option:

1. OPTION_DNS_SERVERS (code 23).
2. OPTION_DOMAIN_LIST (code 24). Reference for above ORO options: http://tools.ietf.org/html/rfc3646.
3. OPTION_ELAPSED_TIME(code 8). A client MUST include an Elapsed Time option in messages to indicate how long the client has been trying to complete a DHCP message exchange.