IP/MAC binding | Firewall configuration |
|
|
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.
Configuring IP/MAC binding for packets going to the firewall
Use the following procedure to use IP/MAC binding to filter packets that would normally connect with the firewall (for example, when an administrator is connecting to the FortiGate unit for management).
To configure IP/MAC binding for packets going to the firewall
1Go to Firewall > IP/MAC Binding > Setting.
2Select the Enable IP/MAC binding going to the firewall check box.
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 connect to the firewall are first compared with the entries in the IP/MAC binding table.
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 connect to the firewall.
•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 connect to the firewall if IP/MAC binding is set to Allow traffic,
•is blocked if IP/MAC binding is set to Block traffic.
Adding IP/MAC addresses
To add an IP/MAC address
1Go to Firewall > IP/MAC Binding > Static IP/MAC.
2Select New to add an IP address/MAC address pair.
216 | Fortinet Inc. |
