A-Link WNAP4G User Manual page 37

secondary WAN if primary WAN is Static IP, Dynamic IP, or PPPoE.
B. Failover
With this function enabled, when the primary WAN connection is broken, the
device will automatically switch to secondary WAN connection and keep you
connected to Internet. Meanwhile, if the device detects that the primary WAN
connection is recovered, your Internet connection will be switched from
secondary WAN back to primary WAN.
a. Combo WAN Mode: Choose Failover mode.
b. Remote Host for Keep Alive: Type an IP address or domain name of
remote host to detect if Internet connection is alive.
c. Primary WAN: The primary WAN is the WAN type you set at Internet Setup
page.
d. Secondary WAN: Press "New Add" button to add the secondary WAN. If
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A-LINK WNAP4G User Manual