Fortinet FortiGate 4000 User Manual download pdf (Page 220)

220 Fortinet Inc.

IP/MAC binding Firewall configuration

IP/MAC binding

IP/MAC binding protects the FortiGate unit and your network from IP spoofing attacks.

IP spoofing attacks try to use the IP address of a trusted computer to connect to, or

through, the FortiGate unit from a different computer. The IP address of a computer is

easy to change to a trusted address, but MAC addresses are added to ethernet cards

at the factory and are not easy to change.

You can enter the static IP addresses and corresponding MAC addresses of trusted

computers in the static IP/MAC table.

If you have trusted computers with dynamic IP addresses that are set by the FortiGate

DHCP server, the FortiGate unit adds these IP addresses and their corresponding

MAC addresses to the dynamic IP/MAC table. For information about viewing the table,

see “Viewing a DHCP server dynamic IP list” on page 165. The dynamic IP/MAC

binding table is not available in Transparent mode.

You can enable IP/MAC binding for packets in sessions connecting to the firewall or

passing through the firewall.

This section describes:

• Configuring IP/MAC binding for packets going through the firewall

• Configuring IP/MAC binding for packets going to the firewall

• Adding IP/MAC addresses

• Viewing the dynamic IP/MAC list

• Enabling IP/MAC binding

Configuring IP/MAC binding for packets going through the firewall

Use the following procedure to use IP/MAC binding to filter packets that a firewall

policy would normally allow through the firewall.

To configure IP/MAC binding for packets going through the firewall

1 Go to Firewall > IP/MAC Binding > Setting.

2 Select the Enable IP/MAC binding going through the firewall check box.

3 Go to Firewall > IP/MAC Binding > Static IP/MAC.

4 Select New to add IP/MAC binding pairs to the IP/MAC binding list.

All packets that would normally be allowed through the firewall by a firewall policy are

first compared with the entries in the IP/MAC binding list. If a match is found, then the

firewall attempts to match the packet with a policy.

Note: If you enable IP/MAC binding and change the IP address of a computer with an IP or

MAC address in the IP/MAC list, you must also change the entry in the IP/MAC list or the

computer does not have access to or through the FortiGate unit. You must also add the IP/MAC

address pair of any new computer that you add to your network or the new computer does not

have access to or through the FortiGate unit.

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Fortinet FortiGate 4000 User Manual Page 220