Check Point UTM-1 Edge User Manual page 262

Configuring High Availability on a Gateway
You can assign a virtual IP address to any internal interface, as well as to Internet
connections that are configured as "LAN - Static IP".
Click the Synchronization radio button next to the network you want to use as
6.
the synchronization interface.
Note: The synchronization interface must be the same for all gateways, and must
always be connected and enabled on all gateways. Otherwise, multiple appliances
may become active, causing unpredictable problems.
The synchronization interface cannot be an Internet connection or a wireless
interface.
7. Complete the fields using the information the following table.
Click Apply.
8.
A success message appears.
9. If desired, configure WAN HA for both the primary and secondary Internet
connection.
This setting should be the same for all gateways. For further information, see the Do
not connect if this gateway is in passive state field in Using Internet Setup on page
113.
10. If you configured a virtual IP address for the WAN or WAN2 interface,
configure the Internet connection to use the "Static IP" connection method.
See Using Internet Setup on page 113.
248 Check Point UTM-1 Edge User Guide