Fortinet FortiGate 4000 User Manual download pdf (Page 163)

Network configuration Configuring DHCP services

FortiGate-4000 Installation and Configuration Guide 163

Configuring a DHCP relay agent

In a DHCP relay configuration, the FortiGate unit forwards DHCP requests from

DHCP clients through the FortiGate unit to a DHCP server. The FortiGate unit also

returns responses from the DHCP server to the DHCP clients. The DHCP server must

have a route to the FortiGate unit that is configured as the DHCP relay so that the

packets sent by the DHCP server to the DHCP client arrive at the FortiGate

performing DHCP relay.

To configure an interface as a DHCP relay agent

1 Go to System > Network > DHCP.

2 Select Service.

3 Select the interface to be the DHCP relay agent.

4 Select DHCP Relay Agent.

5 Enter the DHCP Server IP address.

6 Select Apply.

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.

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Fortinet FortiGate 4000 User Manual Page 163