In the left pane, under Network, click Ethernet WAN.
Set Enable to Yes.
Select a WAN interface.
Select a Configuration Mode.
The “Manual (Static IP Address)” mode requires entering the values in the Manual Settings fields.
Click Submit to save the settings.
Use the Connectivity Monitor settings when WAN redundancy functionality is required. The Connectivity Monitor keeps checking the connection to the given remote host to determine the network status. If the ping does not get an answer within a given time window, it informs the WAN switch logic to try the secondary interface.