Using the Domain Name Service (DNS) Monitor

The DNS monitor is a simple service Monitor that checks for the DNS (Domain Name Server) on port 53. If no DNS service responds on this port, then the service is considered down.

To configure a DNS Monitor:

Go to the Active Monitor Library:
- From the web interface, click GO. The GO menu appears.
- If the WhatsUp section is not visible, click WhatsUp. The WhatsUp section of the GO menu appears.
- Select Configure > Active Monitor Library. The Active Monitor Library appears.
  - or -
  
  From the main menu of the console, select Configure > Active Monitor Library. The Active Monitor Library appears.
In the Active Monitor Library, do one of the following:
- Click New. The Select Active Monitor Type dialog appears.
- Select DNS Monitor from the list, then click OK. The Add DNS Monitor dialog appears.
  - or -
  Select an existing DNS Monitor, then click Edit. The monitor properties dialog appears.
Enter or select the appropriate information in the following fields.
- Name. The name of the monitor as it appears in the Active Monitor Library.
- Description. The description of the monitor as it appears in the Active Monitor Library.
- Timeout. Enter a timeout value. This is the length of time in which the service is given a chance to respond. If there is no response in this amount of time, the service is considered down.
- Use in Rescan. Select this option to have the monitor appear in the Active Monitor list on the Device Properties dialog. WhatsUp Gold will add the monitor type to the device during a rescan, which is launched using the Rescan button on the Device Properties dialog, if the protocol or service is active on the device.
Click OK to save changes.