Locations and dynamic DNS
Dynamic DNS (DDNS) providers allow organizations to register IP addresses that change dynamically with a persistent DNS hostname. Some organizations cannot use static IP addresses from their Internet service provider (ISP) and instead rely on IP addresses that are assigned dynamically and change from time to time.
If your Internet connection uses dynamic IP addresses, you can use a dynamic DNS provider to assign a permanent DNS hostname for a location. When the IP address changes, your router can then communicate with the dynamic DNS provider and update that hostname with the associated dynamic IP addresses.
By configuring a location with a hostname that's registered with the dynamic DNS provider, ETP can detect when the IP address assigned to your location is changed by the ISP.
The Location page alerts administrators when a location is assigned a domain that no longer resolves to a valid IP address. Administrators can also see if there is a problem with resolution when creating or modifying a location with dynamic DNS. Errors occur when no response is detected from the IP address or a domain resolves to a private or reserved IP address.
Administrators can also see which locations are generating invalid DNS errors by downloading a spreadsheet with these locations and by configuring a user to receive an email notification for system issues. On the Locations page, administrators can download a spreadsheet that contains locations with invalid DNS entries. You can use this spreadsheet to identify the location configurations that require immediate attention. If an ETP user or administrator is configured to receive email notifications for system issues, the user or administrator receives a notification that lists locations with invalid DNS entries. For more information on email notifications, see Communication emails.
To resolve these issues, administrators can update the location configuration or they can correct the dynamic DNS entries registered with the dynamic DNS provider.
Note the following:
- ETP resolves dynamic IP addresses every 24 hours. While most ISPs allocate IP addresses for a long period of time, there may be a window of time when the IP address changes before ETP discovers it. If this occurs, the default policy applies. Until the new IP address is discovered, events and network traffic are reported under the Unidentified IPs location.
- Make sure that your dynamic DNS hostname resolves to an IP address that is not specified in another ETP location.