Use the following procedure to troubleshoot IPv6 DHCP Relay on the server side.
The IP pool must contain the range of addresses that you want to assign to the clients.
Configure the IP pool with the same network subnet as that of the relay agent.
Ensure that a route to the relay is configured.
Note
You can receive some log messages that indicate the system cannot forward packets. However, certain situations are not DHCP failures.
Example 1: if you receive the message 0x00108796 (relayMsgSend): cannot find route entry for destination on the console, you must ping the server. If the server is not reachable, the system cannot forward the packet. This is not a DHCP issue.
Example 2: if you receive the message 0x00108705 this indicates a problem at the transmission level. Check the server reachability and ensure that MAC learning is correct before you pursue DHCP issues.