Before configuring a firewall interface as a DHCP Client, make sure you have configured a Layer 3 Ethernet or Layer 3 VLAN interface, and the interface is assigned 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.
Configure an Interface as a DHCP Client
Configure an interface as a DHCP client. Select Network > Interfaces. On the Ethernet tab or the VLAN tab, click Add and enter an interface, or click a configured interface, that you want to be a DHCP client. Click the IPv4 tab; for Type, select DHCP Client. Select Enable. ( Optional ) Select Automatically create default route pointing to default gateway provided by server. This causes the firewall to create a static route to a default gateway that will be useful when clients are trying to access many destinations that do not need to have routes maintained in a routing table on the firewall. ( Optional ) Enter a Default Route Metric (priority level) for the route between the firewall and the DHCP server (range is 1-65535; there is no default metric). 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. ( Optional ) Select Show DHCP Client Runtime Info to see all of the settings the client has inherited from its DHCP server.
Save the configuration. Click OK and Commit the change. Now the Ethernet interface indicates Dynamic-DHCP Client in its IP Address field on the Ethernet tab.
( Optional ) See which interfaces on the firewall are configured as DHCP clients. Select Network > Interfaces > Ethernet and look in the IP Address field to see which interfaces indicate DHCP Client. Select Network > Interfaces > VLAN and look in the IP Address field to see which interfaces indicate DHCP Client.

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