Right click vào LAN card đang sử dụng, click Properties
Click this bar to view the full image.

Click Internet Protocol, click Properties

Click Use the following DNS addresses, nhập IP vào: 208.67.220.220

OK, done.
đây là 1 số DNS của vnpt
203.162.0.11
203.162.4.1
203.162.0.181
203.162.1.180
203.162.1.190
203.162.4.190
203.162.0.191