Cradlepoint ARC CBA850 Product Manual page 88

CBA850 | USER MANUAL Firmware version 5.4.0
CRADLEPOINT
IPV4 FAILURE CHECK (ADVANCED)
If this is enabled, the router will check
that the highest priority active WAN
interface can get to the Internet even if
the WAN connection is not actively
being used. If the interface goes down,
the router will switch to the next highest
priority interface available. If this is not
selected, the router will still failover to
the next highest priority interface but
only after the user has attempted to get out to the Internet and failed.
Idle Check Interval: The amount of time between each check. (Default: 30 seconds. Range: 10-3600 seconds.)
Monitor while connected: (Default: Off) Select from the following dropdown options:
• Passive DNS (modem only): The router will take no action until data is detected that is destined for the WAN. When this
data is detected, the data will be sent and the router will check for received data for 2 seconds. If no data is received the
router behaves as described below under Active DNS.
• Active DNS (modem only): A DNS request will be sent to the DNS servers. If no data is received, the DNS request will
be retried four times at 5-second intervals. (The first two requests will be directed at the Primary DNS server and the
second two requests will be directed at the Secondary DNS server.) If still no data is received, the device will be
disconnected and failover will occur.
• Active Ping: A ping request will be sent to the Ping Target. If no data is received, the ping request will be retried four
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. This must be an address that can be
reached through your WAN connection (modem/Ethernet). 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.
Google Public DNS at 8.8.8.8 or Level 3 Communications at 4.2.2.2.
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For example, you might ping
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