Diameter User Guide Configuring Diameter Diameter Peer Discovery DNS Sets Deleting DNS Sets Deleting DNS Sets Use this task to delete DNS Sets. The default DNS Set Name can be edited, but cannot be deleted. Click Diameter, and then Configuration, and then Peer Discovery, and then DNS Sets. Select the DNS Set you want to delete. Click Delete.A popup window appears to confirm the delete. Note:Deletion is only possible if all validation checks pass. If validation fails, an error code displays. Click OK or Cancel.