Friday, May 10, 2019

Ping explained

Ping is perhaps the most used tool to troubleshoot a network. Ping (Packet Internet Groper) is included in most operating systems. It is called using a ping command and uses ICMP (Internet Control Message Protocol) to report errors and provide information about the handling of IP packets. 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 response message.

A ping command typically provides other information about network performance, for example, round-trip time, time to send an ICMP request packet, and receive an ICMP response packet.

Here is an output of the Windows 7 ping command:




In the example above, we ping the IP address 10.10.100.1. By default, ping on Windows sends four ICMP request packets. As you can see from the previous output, the host with the IP address 10.10.100.1 is accessible and has responded with four ICMP response packets. It is also possible to see that the remote host responded in 1 ms (time <1 ms), indicating that the network is not congested.


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