你是单机上网吗?还是怎么样的上网方式? 看看上一级路由器有或是防火墙有没封掉这个网站吧。我是可以PING通的
ping www.sina.com.cn
Pinging taurus.sina.com.cn [61.172.201.34] with 32 bytes of data:
Reply from 61.172.201.34: bytes=32 time=28ms TTL=56
Reply from 61.172.201.34: bytes=32 time=28ms TTL=56
Reply from 61.172.201.34: bytes=32 time=28ms TTL=56
Reply from 61.172.201.34: bytes=32 time=28ms TTL=56
Ping statistics for 61.172.201.34:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 28ms, Maximum = 28ms, Average = 28ms