Cradlepoint ARC CBA850 Product Manual page 28

CBA850 | USER MANUAL Firmware version 5.4.0
CRADLEPOINT
8. Configuring Failure Check
It is possible for a WAN interface to go down without the router recognizing the failure. (For example: the carrier for a cellular
modem goes dormant.) Enable Failure Check to ensure that you can get out to the Internet via your primary WAN connection. This
option is disabled by default because it may use data unnecessarily. Use this in combination with failover or Aggressive Reset
(Internet → Connection Manager under Modem Settings in the interface/rule editor).
Idle Check Interval: Set the
number of seconds the router will
wait between checks to see if the
WAN is still available. (Default: 30
seconds. Range: 10-3600 seconds.)
Failure Check: Select from the
dropdown menu. (Default: Off)
• Active Ping: A ping
request will be sent to the
Ping Target. If no data is
received, the ping request
will be retried 4 times at 5-
second intervals. If still no
data is received, the device will be disconnected and failover will occur. When "Active Ping" is selected, the next line gives
an estimate of data usage in this form: "Active Ping could use as much as 9.3 MB of data per month." This amount depends
on the Idle Check Interval.
• Off: Once the link is established the router takes no action to verify that it is still up.
Ping IP Address: If you selected "Active Ping", you will need to input an IP address that will respond to a ping request. This IP
address must be an address that can be reached through your WAN connection. Some ISPs/Carriers block certain addresses, so
choose an address that all of your WAN connections can use. For best results, select an established public IP address.
you might ping Google Public DNS at 8.8.8.8 or Level 3 Communications at 4.2.2.2.
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