Ping is a utility used to test the reachability of a host an a network. In the absence of connection ping registers from a normal state to a state of alarm. After you restore the connection - ping registers back to a normal state.
To add a ping, go to "Add" in the upper left corner of the web interface, select "Add Ping" . Ping properties window will appear.
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Specify the server address, ping period, the estimated round-trip time between sending a request and receiving a response and press "Save".