If the Automatically-assigned DNS check box is selected, this router will accept the first received DNS assignment from one of the PPPoA, PPPoE or MER/DHCP enabled PVC(s) during the connection establishment. If the checkbox is cleared, enter the primary and optional secondary DNS server IP addresses. Press Apply to save it.
Note: If you select the Automatically-assigned DNS check box, you must restart the router to get the automatically-assigned DNS addresses.