The SonicWall security appliance includes a DHCP (Dynamic Host Configuration Protocol) server to distribute IP addresses, subnet masks, gateway addresses, and DNS server addresses to your network clients. The Network > DHCP Server page includes settings for configuring the SonicWall security appliance’s DHCP server.
You can use the SonicWall security appliance’s DHCP server or use existing DHCP servers on your network. If your network uses its own DHCP servers, make sure the Enable DHCP Server check box is unchecked.