DynDNS
Network Monitoring Readme
Important information to know about Network Monitoring
Hosts and Service Monitors
A single Network Monitoring host can have many service monitors. For example, a NetMon host could have both an HTTP service check and a SMTP service check, allowing our monitoring centers to regularly poll both your webserver and mail server to ensure they are operating correctly. Each service monitor may have a separate notification contact (in addition to the primary contact), allowing specific individuals (e.g. the mail server administrator) to be contacted in case of a detected outage.
Host Status Definitions
Overall host statuses can be one of five states:
Green (Good): This host's service monitors are operating correctly and returning successful checks.
Yellow (Trouble): One or more of this host's service monitors are returning an error.
Red (Failure): All of this host's service monitors are reporting errors.
Disabled: This host's service monitors have been paused, and no active checks are being performed.
Unknown: This host or its services have been recently activated, and it does not have enough data to report, or its services have encountered an unexpected error.
Service Monitor Definitions
Like host statuses, service monitors can be one of five states. Each monitor evalutes its past checks with the current check to determine its status. These statuses are:
- Green (Good): All of our monitoring centers were able to perform two successful checks in a row.
- Yellow (Trouble): One of the monitoring centers reported a failure during its last or current check. This does not necessarily indicate an outage. This status can also occur if the service is available but the expected data does not match.
- Red (Failure): All of our monitoring centers reported a failure for two checks in a row. This usually indicates an outage.
- Disabled: This service monitor has been paused, and no active checks are being performed.
- Unknown: This service monitor has been recently activated, and it does not have enough data to report, or it has encountered an unexpected error.
Filtering Checks
If you want to filter or process our email check notifications, you should configure your mail client to look for a mail header "X-DYNDNS-Netmon: Monitoring Alert".
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