Is ICMP a ping?
ICMP is probably most well known as the message protocol used for the ping command. A ping command sends an ICMP echo request to the target host. The target host responds with an echo reply.
What is ICMP identifier?
Header. The ICMP header starts after the IPv4 header and is identified by IP protocol number ‘1’. All ICMP packets have an 8-byte header and variable-sized data section. The first 4 bytes of the header have fixed format, while the last 4 bytes depend on the type/code of that ICMP packet.