It is perhaps the most common tool to troubleshoot a network. Ping (Packet Internet Groper) is available in the most operating systems. It is invoked using a ping command and uses ICMP (Internet Control Message Protocol) to report errors. It also 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, then it responds with an ICMP echo reply message.
This command usually outputs some other information about a network performance. For example. a round-trip time, a time to send an ICMP request packetand receive an ICMP reply packet.
Here is an output of the ping command from Windows 7:
In the example above we have pinged the ip address 10.10.100.1. By default, ping (Packet Internet Groper) on Windows sends four ICMP request packets. As you can see from the output above, the host with the IP address of 10.10.100.1 is reachable and has replied with four ICMP reply packets. You can also see that the remote host has replied within 1 ms (time<1ms). This also indicates that the network is not congested.
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