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Ping- A Vital Computer Network Monitoring Tool Ping is an important Computer Network Monitoring Tool. It Tests whether the given host can be reached through an IP network. This system works by posting an ICMP “echo Request” in packets to the target and listens for the ICMP “echo Response” type replies. Ping also estimates the time for each round, which is generally in milliseconds. It also records if there has been any kind of packet or data loss and finally it reports its findings in form of a summary. The word “Ping” is commonly also used as a noun or a verb. It can refer to round trip time directly, or to the act of executing a ping program or the act of calculating the round trip time. In December 1983, Mike Muuss compiled a program, which acted as a tool to solve the weird behavior of any IP network. He named the Software after the pulses of the sound emitted by sonar as the operation of the software was not unlike the active sonar present in the submarines, where the operator projects a pulse of energy towards the target which reflects back and is then received by the operator again. Later, an Acronym “Packet InterNet Grouper”, which is also referred as Packet Inter Network Groper was provided by David L. Mills. The importance of ping for assisting the diagnosing weakened in late 2003 as quite a few Internet Service Providers (ISP) zoned out ICMP Type 8, the type in which echo was requested, from the boundary of their network. This was due to the fact that ping was increasing used for target reconnaissance. Some Internet worms like Welchia flooded the World Web with Ping Requests so that it can easily locate new targets to infect. Along with leaking the information about the target to the attacker, it also added lot of load on the network, which caused lots of problems for different routers throughout the internet. RFC 112 has issued a guideline that any host should accept the echo request and must issue the echo reply, this standard is not followed regularly on the internet. Even Windows XP, service pack 1 will not respond to the echo request over the Internet. Those who don’t follow the norms claim that not responding increases the security of the network, while the standard followers say that not responding to ping requests obstructs the network diagnostics. Thus there are various views on the issue of Ping as a vital computer network-monitoring tool.