In general you can’t. ping needs a direct network connection on the IP
level to do its work. A proxy works on a higher layer of the TCP/IP
network model, where there is no direct access to the IP protocol.

You would need to somehow circumvent the proxy (change firewall
settings, use a VPN, …). Whether this is possible (and allowed)
depends on your network configuration, but it’s probably not possible.

As a workaround, there are many web-based ping services available
(search for “web-based ping”). These will work.

简单的说就是 ping 命令需要直接网络，不能使用代理，所以每一次ping google 的时候，都是 timeout

作为替代的方法，可以使用基于 web 的 ping 工具

在这里我使用 wget 就能访问