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14
User Manual
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IBR350
5/6/16
FAILBACK
This is used to configure failback, which is the ability to go back to a higher priority WAN interface if it regains
connection to its network.
Select the
Failback Mode
from the following
options:
•
Usage
•
Time
•
Disabled
Usage Threshold
: Fail back based on the amount
of data passed over time. This is a good setting
for when you have a dual-mode EVDO/WiMAX
modem and you are going in and out of WiMAX
coverage. If the router has failed over to EVDO it
will wait until you have low data usage before bringing down the EVDO connection to check if a WiMAX connection can
be made.
•
High (Rate: 80 KB/s. Time Period: 30 seconds.)
•
Normal (Rate: 20 KB/s. Time Period: 90 seconds.)
•
Low (Rate: 10 KB/s. Time Period: 240 seconds.)
WAN VERIFY
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 two 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 five-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 five-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.
