校内网使用PING没有返回时间

问题描述：

C:\Documents and Settings\Administrator>ping www.baidu.com

Pinging www.a.shifen.com [202.108.22.43] with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 202.108.22.43:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

只返回了百度的IP.其他信息都没有,是不是学校的代理服务器过滤了什么数据?

问题解答：

网站整个就没回复嘛……可能是防火墙阻挡了数据返回吧