Cradlepoint IBR1100 User Manual page 23

User Manual / IBR1100/IBR1150
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.
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.)
• Custom (Rate range: 1-100 KB/s. Time Period range: 10-300 seconds.)
Time: Fail back only after a set period of time. (Default: 90 seconds. Range: 10-300 seconds.) This is a good setting if
you have a primary wired WAN connection and only use a modem for failover when your wired connection goes down.
This ensures that the higher priority interface has remained online for a set period of time before it becomes active
(in case the connection is dropping in and out, for example).
Disabled: Deactivate failback mode.
Immediate Mode: Fail back immediately whenever a higher priority interface is plugged in or when there is a priority
change. Immediate failback returns you to the use of your preferred Internet source more quickly which may have
advantages such as reducing the cost of a failover data plan, but it may cause more interruptions in your network
than Usage or Time modes.
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