Assignment involving four messages

Figure 61 shows the process of IPv6 address/prefix assignment involving four messages.

The assignment involving four messages operates in the following steps:

1. The DHCPv6 client sends out a Solicit message, requesting an IPv6 address/prefix and other configuration parameters.

2. If the Solicit message does not contain a Rapid Commit option, or if the DHCPv6 server does not support rapid assignment even though the Solicit message contains a Rapid Commit option, the DHCPv6 server responds with an Advertise message, informing the DHCPv6 client of the assignable address/prefix and other configuration parameters.

3. The DHCPv6 client may receive multiple Advertise messages offered by different DHCPv6 servers. It then selects an offer according to the receiving sequence and server priority, and sends a Request message to the selected server for the confirmation of assignment.

4. The DHCPv6 server sends a Reply message to the client, confirming that the address/prefix and other configuration parameters are assigned to the client.