windows - 尽管 Web 浏览器在同一台计算机上运行，​​但 Ping 请求超时

Question

我现在在万维网上，在 StackOverflow 上发帖就是证明。但是，如果我尝试从命令行 ping stackoverflow.com，ping 会超时。我需要做什么才能使 ping 正常工作？

> ping stackoverflow.com

Pinging stackoverflow.com [198.252.206.140] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 198.252.206.140:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

编辑，试试tracert

> tracert stackoverflow.com

Tracing route to stackoverflow.com [198.252.206.140] over a maximum of 30 hops:

  1     *        *        *     Request timed out.
  2     *        *        *     Request timed out.
  3     *        *        *     Request timed out.
  4     *        *        *     Request timed out.
  5     *        *        *     Request timed out.
  6     *        *        *     Request timed out.
  7     *        *        *     Request timed out.
  8     *        *        *     Request timed out.
  9     *        *        *     Request timed out.
 10     *        *        *     Request timed out.
 11     *        *        *     Request timed out.
 12     *        *        *     Request timed out.
 13     *        *        *     Request timed out.
 14     *        *        *     Request timed out.
 15     *        *        *     Request timed out.
 ...
 Trace complete.

它是 请求超时。 一直到 30 跳。

编辑，尝试ping google.com

同样的结果。 :-)

Answer 1

有些主机有防火墙，可以阻止 ICMP ( http://ca.wikipedia.org/wiki/Internet_Control_Message_Protocol ) 数据包，如 ping。您可以使用 traceroute(cmd 行工具或在线网站，如 http://ping.eu/traceroute/)或 tcptraceroute(http://linux.die.net/man/1/tcptraceroute)。

一些路由器也有阻止 ICMP 的防火墙。您可以通过 ping google.com 检测到这一点。它失败了，那么问题出在您的本地路由器上，而不是远程主机。

希望对你有帮助