OPNsenseInterfaceInputErrors

OPNsenseInterfaceInputErrors #

Interface {{ $labels.interface }} ({{ $labels.device }}) has input errors

Alert Rule
alert: OPNsenseInterfaceInputErrors
annotations:
  description: |-
    Interface {{ $labels.interface }} ({{ $labels.device }}) has input errors
      VALUE = {{ $value }}
      LABELS = {{ $labels }}    
  runbook: https://srerun.github.io/prometheus-alerts/runbooks/opnsense/opnsenseinterfaceinputerrors/
  summary: OPNsense interface input errors (instance {{ $labels.opnsense_instance
    }})
expr: increase(opnsense_interfaces_input_errors_total[5m]) > 0
for: 5m
labels:
  severity: warning

Meaning #

The OPNsenseInterfaceInputErrors alert is triggered when the total number of input errors on an OPNsense interface increases within a 5-minute window. This alert indicates that there are issues with the interface receiving data, which could be due to various reasons such as hardware problems, network congestion, or configuration errors.

Impact #

The impact of this alert can be significant, as input errors can lead to packet loss, delayed transmissions, and overall network performance degradation. If left unaddressed, these errors can cause disruptions to critical services and applications that rely on the affected interface. Additionally, input errors can also be a symptom of a larger problem, such as a faulty network card or a misconfigured network setup.

Diagnosis #

To diagnose the issue, the following steps can be taken:

  1. Check the interface configuration: Verify that the interface is properly configured and that there are no errors in the configuration file.
  2. Inspect the network cables and connections: Ensure that all network cables are securely connected and not damaged.
  3. Monitor network traffic: Use tools like tcpdump or Wireshark to monitor network traffic and identify any patterns or anomalies that could be contributing to the input errors.
  4. Check system logs: Review system logs to see if there are any error messages related to the interface or network stack.
  5. Run interface diagnostics: Utilize built-in diagnostic tools, such as ethtool or mii-tool, to test the interface and identify any hardware issues.

Mitigation #

To mitigate the issue, the following steps can be taken:

  1. Restart the interface: Try restarting the interface to see if it resolves the issue.
  2. Replace faulty hardware: If the issue is determined to be hardware-related, replace the faulty component, such as the network card or cable.
  3. Adjust network settings: Adjust network settings, such as MTU size or duplex mode, to optimize performance and reduce errors.
  4. Implement Quality of Service (QoS) policies: Implement QoS policies to prioritize critical traffic and minimize the impact of input errors on network performance.
  5. Schedule regular maintenance: Schedule regular maintenance tasks, such as checking and updating firmware, to prevent similar issues in the future.
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