Fortinet FortiGate-800 manual 159, To add a scope to a Dhcp server Go to System Network Dhcp

Network configuration Configuring DHCP services

You can add multiple scopes to an interface so that the DHCP server added to that interface can supply IP addresses to computers on multiple subnets.

Add multiple scopes if the DHCP server receives DHCP requests from subnets that are not connected directly to the FortiGate unit. In this case, the DHCP requests are sent to the FortiGate unit through DHCP relay. DHCP relay packets contain DHCP relay IP, which is the IP address of the subnet from which the DHCP relay received the request.

If the DHCP request received by the DHCP server is not forwarded by a DHCP relay, the DHCP server decides which scope to use based on the IP address of the interface that received the DHCP request; usually the scope with the same subnet as the interface.

If the DHCP request received by the server is forwarded by a DHCP relay, the relay IP is used to select the scope.

To add a scope to a DHCP server

1Go to System > Network > DHCP.

2Select Address Scope.

3Select an interface.

You must configure the interface as a DHCP server before it can be selected.

4Select New to add an address scope.

5Configure the address scope.

Scope Name	Enter the address scope name.
IP Pool	Enter the starting IP and ending IP for the range of IP addresses that this
	DHCP server assigns to DHCP clients.
Netmask	Enter the netmask that the DHCP server assigns to the DHCP clients.
Lease Duration	Enter the interval, in days, hours and minutes, after which a DHCP client
	must ask the DHCP server for a new address.
	If you select Unlimited, DHCP leases never expire.
Domain	Optionally enter in the domain that the DHCP server assigns to the DHCP
	clients.
Default Route	Enter the default route to be assigned to DHCP clients. The default route
	must be on the same subnet as the IP pool.

6Select Advanced if you want to configure Advanced Options.

DNS IP	Enter the addresses of up to 3 DNS servers that the DHCP server assigns
	to the DHCP clients.

WINS Server IP Add the IP addresses of one or two WINS servers to be assigned to DHCP clients.

Exclusion Range Optionally enter up to 4 exclusion ranges of IP addresses within the IP pool that cannot be assigned to DHCP clients.

7Select OK.

FortiGate-800 Installation and Configuration Guide 159