Using a DLink DSL 2750U ADSL router with v.ME_1.15 firmware. Trying to change the DNS provided by ISP to Google DNS. I change the DNS in router configuration page, click on'apply', immediately reboot the router. But after router reboots, the DNS reverts to ISP DNS by itself. 'Obtain DNS server address automatically' is unchecked and 'Use the following DNS server addresses' is selected. Did a hard reset of the router and configured it again, still no good.
I purchased the router myself, not bundled with any ISP contract, if that matters somehow. How do I 'force' the router to use Google DNS instead of the ISP DNS.