Configure an Interface as a DHCP Client
Before configuring a firewall interface as a DHCP client, make sure you have configured a Layer 3 interface (Ethernet, Ethernet subinterface, VLAN, VLAN subinterface, aggregate, or aggregate subinterface), 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.
- Select NetworkInterfaces.
- On the Ethernet tab or the VLAN tab, Add a Layer 3 interface, or select a configured Layer 3 interface, that you want to be a DHCP client.
- Select 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) Select Send Hostname to assign a hostname to the DHCP client interface and send that hostname (Option 12) to a DHCP server, which can register the hostname with the DNS server. The DNS server can then automatically manage hostname-to-dynamic IP address resolutions. External hosts can identify the interface by its hostname. The default value indicates system-hostname, which is the firewall hostname that you set in DeviceSetupManagementGeneral Settings. Alternatively, enter a hostname for the interface, which can be a maximum of 64 characters, including uppercase and lowercase letters, numbers, period (.), hyphen (-), and underscore (_).
- (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.
- Commit your changes.Click OK and Commit.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 NetworkInterfacesEthernet and look in the IP Address field to see which interfaces indicate DHCP Client.
- Select NetworkInterfacesVLAN and look in the IP Address field to see which interfaces indicate DHCP Client.
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