Fortinet FortiGate 50A - Manual (Page 105)

Network configuration Configuring DHCP services
FortiGate-50A Installation and Configuration Guide
105
Configuring a DHCP server
As a DHCP server, the FortiGate unit dynamically assigns IP addresses to hosts
located on connected subnets. You can configure a DHCP server for any FortiGate
interface. You can also configure a DHCP server for more than one FortiGate
interface. For each DHCP server configuration you can add multiple scopes (also
called address scopes) so that the DHCP server can assign IP addresses to
computers on multiple subnets.
Use these procedures to configure an interface as a DHCP server:
• Adding a DHCP server to an interface
• Adding scopes to a DHCP server
• Adding a reserve IP to a DHCP server
• Viewing a DHCP server dynamic IP list
Adding a DHCP server to an interface
To add a DHCP server to an interface
1 Go to System > Network > DHCP.
2 Select Service.
3 Select an interface.
4 Select DHCP Server.
5 Select Apply.
Adding scopes to a DHCP server
If you have configured an interface as a DHCP server, the interface requires at least
one scope (also called an address scope). The scope designates the starting IP and
ending IP for the range of addresses that the FortiGate unit assigns to DHCP clients.
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
1 Go to System > Network > DHCP.
2 Select Address Scope.