Cerio OW-200N2 User Manual page 215

Ping Watchdog : The ping watchdog sets the OW-200N2 Device to continuously ping a user defined IP address
(it can be the internet gateway for example). If it is unable to ping under the user defined constraints, the
OW-200N2 device will automatically reboot. This option creates a kind of "fail-proof" mechanism.
Ping Watchdog is dedicated for continuous monitoring of the particular connection to remote
host using the Ping tool. The Ping works by sending ICMP "echo request" packets to the target
host and listening for ICMP "echo response" replies. If the defined number of replies is not
received, the tool reboots the device.
Enable Ping Watchdog : control will enable Ping Watchdog Tool.
IP Address To Ping : specify an IP address of the target host which will be monitored by Ping Watchdog
Tool.
Ping Interval : specify time interval (in seconds) between the ICMP "echo requests" are sent by the Ping
Watchdog Tool. Default is 300 seconds.
Startup Delay : specify initial time delay (in seconds) until first ICMP "echo requests" are sent by the Ping
Watchdog Tool. The value of Startup Delay should be at least 60 seconds as the network interface and
wireless connection initialization takes considerable amount of time if the device is rebooted. Default is 300
seconds.
Failure Count To Reboot : specify the number of ICMP "echo response" replies. If the specified number of
ICMP "echo response" packets is not received continuously, the Ping Watchdog Tool will reboot the device.
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User's Manual