Ping is a diagnostic tool of TCP / IP, which provides useful information on the presence of another computer network, and on the performance of the connection, much like the sonar of a submarine (hence its name) sends a signal to a network computer and listen to the echo.
Although it is a very useful tool, its results can sometimes be altered by security policies set in the computer investigation, because sometimes, to make invisible to a network computer (undetectable) are configured to not answer this such requests. So if you’re making no response to ping a computer on your network, one of the issues to be considered is the existence of filters at the router, or firewall.
- Ping your local address 127.0.0.1; must respond. If no response, possibly the TCP / IP is damaged. We will have to reinstall the protocol.
- Ping your private IP, if you are in sub network (eg 192.168.1.2). Must respond. If no answer, or you misspelled your ip, or as in the previous case is a problem in the TCP / IP. You can determine your IP with ipconfig
- Ping the private IP gateway. Must respond.
- Ping the public IP gateway. It must respond.
- Ping the IP of a computer outside the network. It must respond.
- Ping the domain name of a computer outside the network. Must respond. Failure to respond (and if in the previous cases), you should check your DNS.