Adding ip/mac addresses – Fortinet FortiGate 4000 User Manual
Page 221
Firewall configuration
IP/MAC binding
FortiGate-4000 Installation and Configuration Guide
221
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
1
Go to Firewall > IP/MAC Binding > Setting.
2
Select the Enable IP/MAC binding going to 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 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
1
Go to Firewall > IP/MAC Binding > Static IP/MAC.
2
Select New to add an IP address/MAC address pair.