IP/MAC binding | Firewall configuration |
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You can enter the static IP addresses and corresponding MAC addresses of trusted computers in the Static IP/MAC table.
IP/MAC binding can be enabled for packets connecting to the firewall or passing through the firewall.
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 will 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 this computer will not have access to or through the FortiGate unit.
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 would normally be allowed through the firewall by a firewall policy.
1Go to Firewall > IP/MAC Binding > Setting.
2Select Enable IP/MAC binding going through the firewall.
3Go to Firewall > IP/MAC Binding > Static IP/MAC.
4Select 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.
For example, if the IP/MAC pair IP 1.1.1.1 and 12:34:56:78:90:ab:cd is added to the IP/MAC binding list:
•A packet with IP address 1.1.1.1 and MAC address 12:34:56:78:90:ab:cd is allowed to go on to be matched with a firewall policy.
•A packet with IP 1.1.1.1 but with a different MAC address is dropped immediately to prevent IP spoofing.
•A packet with a different IP address but with a MAC address of 12:34:56:78:90:ab:cd is dropped immediately to prevent IP spoofing.
•A packet with both the IP address and MAC address not defined in the IP/MAC binding table:
•is allowed to go on to be matched with a firewall policy if IP/MAC binding is set to Allow traffic,
•is blocked if IP/MAC binding is set to Block traffic.
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