Fortinet FortiGate 50A User Manual download pdf (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.

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Fortinet FortiGate 50A User Manual Page 105