Navigate to the NETWORK | System > IP Helper page.
Click the Policies view.
Click +Add. The Add IP Helper Policy dialog displays.
Select DHCPv6 from Protocol.
Select the desired interface from From.
In the To field, type in the destination IPv6 address. This can be a list of destination addresses, which might include unicast addresses, or other addresses you select. The address cannot be a multicast address.
If the destination in the To field is a:
Global address, there is no need to select an egress interface. Go to Step 8.
Link-local address, select an egress interface from Egress Interface.
Click Save.
A new DHCP lease appears in the DHCPv6 Relay Leases section of the page when the client gets a new IP address from the server.