Before configuring a firewall interface as a DHCP client, make sure you have configured a Layer 3 Ethernet or Layer 3 VLAN interface and that you assigned the interface to a virtual router and a zone. Perform this task if you need to use DHCP to request an IPv4 address for an interface on your firewall.
Optionally, enter a Default Route Metric (priority level) for the route between the firewall and the DHCP server. A route with a lower number has higher priority during route selection. For example, a route with a metric of 10 is used before a route with a metric of 100 (range is 1-65535; no default).