PLANET VIP-360PT - Manual (Page 28)

DNS Set the default DNS server IP of the lease table; Click the Add button to submit
and add this lease table
Select name of lease table, click the Delete button will delete the selected lease table from DHCP lease
table.
DNS Relay Select DNS Relay, the default is enabled. Click the Apply button to become effective.
Notice:
1）The size of lease table can not be larger than the quantity of C network IP address. We recommend
you to use the default lease table and not modify it.
2）If you modifies the DHCP lease table, you need save the configuration and reboot.