Network Performance Monitor recognizes the proper connecting commands for checking the standard services listed on the Services dialog; however, to monitor a custom service, you may need to specify the commands to send to the service and the responses to expect from the service in order for Network Performance Monitor to consider the service UP. To specify the commands, you need to determine the proper command strings to expect and send for a custom service.

Use a rule expression to test a string of text for particular patterns:

  • Expression. Enter an expression in the box. Use the >>, Match case, and Invert result options to the right of the Expression box to help build the expression.
  • Comparison text. Enter text to test compare against the expression you built in the Expression box.
  • Test. Click to compare the expression against potential payloads Network Performance Monitor may receive.

After creating and testing the expression, click OK to insert the string into the Match on box.

註: If you have multiple payload "match on" expressions, they are linked by "OR" logic - not "AND" logic. Example: If you have two expressions, one set to "AB" and the other to "BA", it will match against a trap containing any of the following: "AB" or "BA" or "ABBA".