DHCP Server IP | This appears only when Mode is Relay. Enter the IP address of the DHCP server where the FortiGate unit obtains the requested IP address. |
Address Range | By default, the FortiGate unit assigns an address range based on the address of the interface for the complete scope of the address. For example, if the interface address is 172.20.120.230, the default range created is 172.20.120.231 to 172.20.120.254. Select the range and select Edit to adjust the range as needed, or select Create New to add a different range. |
Netmask | Enter the netmask of the addresses that the DHCP server assigns. |
Default Gateway | Select to either use the same IP as the interface or select Specify and enter the IP address of the default gateway that the DHCP server assigns to DHCP clients. |
DNS Server | Select to use the system’s DNS settings or select Specify and enter the IP address of the DNS server. |
Advanced | |
Mode | Select the type of DHCP server the FortiGate unit will be. By default, it is a server. Select Relay if needed. When Relay is selected, the above configuration is replaced by a field to enter the DHCP Server IP address. |
Type | Select to use the DHCP in regular or IPsec mode. |
MAC Address Access Control List | Select to match an IP address from the DHCP server to a specific client or device using its MAC address. In a typical situation, an IP address is assigned ad hoc to a client, and that assignment times out after a specific time of inactivity from the client, known as the lease time. To ensure a client or device always has the same IP address, that is, there is no lease time, use IP reservation. For more information, see “Assigning IP address by MAC address”. |
Add from DHCP Client List | If the client is currently connected and using an IP address from the DHCP server, you can select this option to select the client from the list. |