How to ping when behind a proxy?

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.

You may try this,But first you have to install curl.

http_proxy=http://<proxy_username>:<proxy_password>@<your_proxy_server>:<your_proxy_port>  curl -I http://google.com/