Manual:The Dude v6/Probes

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Revision as of 12:08, 30 April 2018 by Pauls (talk | contribs) (Custom probe function update)
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The Probes pane shows the available methods of checking for device services. Probes are used when discovering new devices and when polling existing devices.

Applies to RouterOS: v6.34+

There is a wide choice of predefined Probes, and you can also add new ones. Double-click an existing Probe to see how it was set up, or to adjust it's settings.

Adding new probes

There are several probe types, they are:

  • DNS - Sends DNS resolve request with specified name to resolve, and optionally checks if response matches the specified IP addresses (at least one of them)
  • Function - Performs custom functions to decide if service is up. If the device is up, can graph data of another function
  • ICMP - Sends ICMP echo requests (pings) of specified packet size and TTL. Can try a number of times, and specify retry interval.
  • Logic - Logic probe invokes other probes and performs logic operations based on results
  • Random - Randomly decides if service is up, or not. Can specify up chance. Useful for testing.
  • SNMP - Will query specified OID and service will be up, if a response is received and result of comparison is a logical true
  • TCP - Generic TCP probe, can be used for various protocols. Can send and wait for specific responses
  • UDP - Generic UDP probe, can be used for various protocols. Can send and wait for specific responses

Custom probe using a function

This probe will check the voltage level of monitored device using an SNMP protocol, and trigger alert if voltage level drops below 20 V. To achieve this, follow these 2 steps:

1. Create a new function, which will check the current voltage level, and return 0 if the value drops below 20 V. Custom_Voltage_Function code example:

if((oid("1.3.6.1.4.1.14988.1.1.3.8.0")>19),"1", "0")

2. Create a new probe using this function, where the service will be considered up if the returned value is true (1):

Available: Custom_Voltage_Function()

The error will be trigered if the value is not empty:

Error: if(Custom_Voltage_Function(), "", "down")


Recommended resources

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