Airlink101 AR580W3G manual Fail Over, Wan

3-4 Fail Over

WAN failure detection works by detecting the presence of traffic on the 3G modem link. If the link is idle for too long the router will attempt to ping a target IP address. If the ping does not reply, the router assumes the link is down and attempts to fail over to ethernet WAN link.

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Here are descriptions of every setup items:

WAN	Check this box to enable Fail Over function.
FailOver (1):
WAN Priority (2):	Please select the WAN connection priority from the drop-down
	menu.
Idle Timeout	Please input the idle time for detecting the Internet
Detect (3):	connection. If the major Internet connection is idle for this amount
	of time then the router will send a ping to the target IP Address
	you have assigned. If the ping gets a reply, the router will restart
	the idle timer, otherwise it will failover to the second priority of
	WAN connection.

Note: The router will not connect back to the first priority of Internet connection

once it has already failed over to another one106 .