Open Network Settings (network-admin) by going to System -> Preferences -> Network Connections. Go to your default net connection and click on Edit button.
You will get a window like below :
Change the Method option to Automatic (PPP) addresses only. Then change the DNS servers field to the following text(IP addresses):
Finally, click on Apply button. Now the settings have been saved. To try the new settings either disconnect the active internet connections and start a new connection or reboot your computer.