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Saturday, January 19, 2019

What is Ping

Ping:-

Ping stands for Packet Internet Groper. Ping is perhaps the most commonly used tool to troubleshooting a network. Ping (Packet Internet Groper) is included with most operating systems, like available for UNIX and Unix-like operating systems, DOS, Microsoft Windows, and ReactOS. 

Mike Muuss written ping utility in December 1983 during employment at the Ballistic Research Laboratory, now the US Army Research Laboratory. Ping utility was created as a tool for troubleshooting problems in IP networks. Ping was first included in 4.3BSD. It is invoked using a ping command. Ping command uses ICMP (Internet Control Message Protocol) to reports errors and provides information related to IP packet processing. Ping works by sending an ICMP echo request message to the specified IP address. If the computer with the destination IP address is reachable, it responds with an ICMP echo reply message.

A ping command usually outputs some other information about a network performance, for example a round-trip time, a time to send an ICMP request packet and receive an ICMP reply packet.


In the example we have pinged the IP address 172.217.166.238. By default, ping on Windows sends four ICMP request packets. As you can see from the output above, the host with the IP address of 172.217.166.238 is reachable and has replied with four ICMP reply packets. You can also see that the remote host has replied within 1ms (time<1ms), which indicates that the network is not congested.

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