尽管Web浏览器在同一台计算机上运行，​​Ping请求超时

Question

我现在正在使用万维网，正如在StackOverflow上发布的那样。但是，如果我从命令行尝试ping stackoverflow.com，则ping超时。 ping是否需要做什么工作？

> 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，尝试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Request timed out.一直到30跳。

编辑，尝试ping google.com

结果相同。 ： - ）

Answer 1

某些主机具有阻止ICMP（http://ca.wikipedia.org/wiki/Internet_Control_Message_Protocol）数据包（如ping）的防火墙。您可以使用traceroute（cmd行工具或在线网络，如http://ping.eu/traceroute/）或tcptraceroute（http://linux.die.net/man/1/tcptraceroute）。

某些路由器还具有阻止ICMP的防火墙。您可以通过ping google.com检测到这一点。它失败了，那么你的本地路由器就有问题，而不是远程主机。

希望它可以帮到你