DHCP Mode
the DHCP mode can be DHCP Server, DHCP Relay and None.
Interface
you can specify which interface you want to enable DHCP Server.
IP Pool Range
the DHCP IP pool address
Default Gateway
the default gateway address
Max Lease Time
the time that the DHCP client is allowed to maintain a network connection.
Domain Name
a user-friendly name that refers to the group of hosts ( subnet ) that will be assigned