DHCP is a service for automatically assigning IP addresses to PCs on the intranet. It is available only when the device works in route mode. Choose System > Network > DHCP. The device can assign IP addresses to PCs connecting to the LAN and DMZ interfaces. The DHCP service needs to be configured separately for the two network interfaces.

For example, the device in route mode acts as a gateway for implementing Internet access for intranet users. Intranet users are connected to the LAN interface, whose IP address is 192.168.1.1. Totally 100 PCs on the intranet need to be assigned IP addresses. The IP address pool is 192.168.1.100–192.168.1.199. The PC of the manager needs to be assigned a fixed IP address 192.168.1.100.

1. Enable the DHCP service.

2. In Interface, select an interface for which DHCP is to be enabled. Select the LAN interface here. Set the lease duration and DHCP network parameters.

In Lease, set the usage time of the assigned IP address.

In Options, set the gateway, DNS, and WINS addresses.

3. In DHCP IP Address Pool, set a range of IP addresses available for automatic assignment.

4. Click Reserved IP Addresses and set a reserved IP address. Then, according to the MAC address, assign a fixed IP address to the PC.

Click Add and enter the name, fixed IP address, MAC address, and hostname in the dialog box.

To view the DHCP operating status and IP address assignment status, choose Status > DHCP Status > Status in the navigation area.