Internet Control Message Protocol is mainly used to communicate the information related to the hosts about the network or any communication problem if occur.

Ping is mainly designed for the ICMP protocol to use in a different kind of network where the time and compatibility among the routers for devices will be of different type.

ICMP is implemented as part of IP, but runs as if it were a higher level protocol.

An Internet Control Message Protocol (ICMP) packet header is 8 Bytes long. The first four bytes always have the same meaning, and the contents of the remaining four depend on the ICMP packet type.

An ICMP header follows the IP header in an IP datagram packet and Internet Control Message Protocol (ICMP) is considered to be an integral part of IPv4.

The most common ICMP messages

• Echo Request and Echo Reply

• Source Quench

• Destination Unreachable

• Time Exceeded