Windows 7的话
Control Panel->Network and Sharing->Change adapter settings(最左边的options)->right click on你的LAN或者WiFi connection->Properties
选择Internet Protocol Version 4 (TCP/IP)->Properties
点击use the following DNS server addresses,然后填8.8.8.8进去第一行->OK要的话hawgeng提到的8.8.4.4就放在第二行
关掉你的游览器,然后再测试你要测试的东西