进入cmd用nslookup测试一下dns是否可用:
C:\Documents and Settings\Administrator>nslookup
Default Server: cache-b.guangzhou.gd.cn
Address: 202.96.128.166
>
www.21cn.com
Server: cache-b.guangzhou.gd.cn
Address: 202.96.128.166
Non-authoritative answer:
Name:
www.cdn.21cn.com
Address: 58.211.81.56
Aliases:
www.21cn.com
>