What Does PING command do? PING Command test reachabilty of any IP (Internet Protocol) Netwok host. How Does PING work?Ping operates by sending an Internet Control Message Protocol (ICMP) Echo Request to a specific network interface and waiting for a response. When a ping command is given, a ping signal is delivered to the destination IP address. The destination host answers to the echo request by sending an echo reply packet. What is PING ?