Interface Health service

The Interface Health service monitors the health of NIC interfaces using SNMP. This service collects inbound discards, inbound errors, outbound discards, outbound errors and outbound queue length from the generic RFC1213-MIB.

  1. Configure SNMP on the device. For more information, see the manufacturer's documentation.
  2. Login to N-able N-central.
  3. Click ViewAll Devices and click the Name of a device.
  4. Click SettingsProperties and ensure Use SNMP is selected.
  5. Click Save if required.
  6. Click Monitoring > Status and click Add.
  7. Enter 1 for the number of instances of the Interface Health service that you would like to associate to the device.
  8. Click Apply.
  9. Click the Interface Health service and click the Service Details tab.
  10. For Monitored Interface, select the NICs/ports that you would like to monitor.
  11. Click OK.
  12. N-able N-central creates a new instance of the Interface Health service for every NIC or port that it is monitoring.

Service TypeSNMP
Instances on a Device400
Supported Systems/ApplicationsAny SNMP MIB-II Compliant Device (RFC1213-MIB or IF-MIB).
Device ClassServer - Generic, Workstation - Generic, Other, Printer, Scanner/Camera, Switch/Router, and Server - Windows
Monitored ByWindows probes
Scan Interval5 minutes
Monitored InterfaceSelect the the NICs or ports that you would like to monitor, identified by SNMP Index, Interface Name, or Interface Alias.


N-able N-central services use Reverse Polish Notation (RPN) for all calculation formulae.

Metric NameOID/CalculationDescription
Inbound Discards

Calculation: Sample2 - Sample1

Inbound Errors

Calculation: Sample2 - Sample1

Outbound Discards

Calculation: Sample2 - Sample1

Outbound Errors

Calculation: Sample2 - Sample1

Administrative Status1. 
Operational Status1.

Mapped as...

  • Normal: 1, 5
  • Warning: 2
  • Failed: 3, 4, 6, 7

... where ...

  • 1: Up
  • 2: Down
  • 3: Testing
  • 4: Unknown
  • 5: Dormant
  • 6: Not Present
  • 7: Lower Layer Down
Detected Port Speed1. the interface's current bandwidth in bits per second.