DNS Event Monitor Reference Guide
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Overview
The DNS Event Monitor ensures that domain name resolution processes are functioning correctly across your network. DNS, or Domain Name System, is critical for translating host names like "www.example.com" into IP addresses such as "192.168.1.1". This monitor is essential for maintaining network connectivity and troubleshooting DNS-related issues.
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Use Cases
- Ensuring Name Resolution: Verify that your DNS servers are resolving names correctly.
- Detecting Changes in Name Resolution: Receive alerts if DNS resolutions for critical hostnames change unexpectedly.
Monitoring Options
DNS Resolution Settings
- Resolve Name Using: Choose to automatically use the DNS servers assigned to your PIM+ system, or specify a DNS server for targeted testing.
- Alert on DNS Server Unavailability: Receive alerts if the DNS server cannot be reached, indicating potential network or server issues.
- Alert on Name Resolution Failure: Get notified if specific device names fail to resolve to an IP address.
- Alert on IP Address Change: Monitor for changes in the resolved IP addresses from one check to the next, useful for identifying unintended modifications in DNS records. Note: This feature is not suitable for environments using round-robin DNS due to the normal variation in resolved addresses.
Configuration Tips
- DNS Server Specification: For specific DNS testing, enter the IP address or hostname of the DNS server you wish to monitor.
- Monitored Hostnames: List the internal or external hostnames you wish to monitor regularly.
Authentication and Security
This event monitor does not require authentication, simplifying setup and maintenance.
Protocols
Data Points
- This event monitor generates the following data points:
| Data Point | Description |
|---|---|
| Time to Resolve (milliseconds) | The time it takes for the event monitor to resolve the DNS name. |
Sample Output
