google 他们刚刚宣布向所有的互联网用户提供一组快速，安全并且完全免费的DNS解析服务器，地址分别是：
8.8.8.8
8.8.4.4
Google Public DNS telephone support
- 877-590-4367 in the U.S.
- 770-200-1201 outside the U.S.
Google Public DNS IP addresses
The Google Public DNS IP addresses are as follows:
- 8.8.8.8
- 8.8.4.4
http://code.google.com/intl/zh-CN/speed/public-dns/docs/using.html