About

The Internet Control Message Protocol (ICMP) are message used to:

• exchange information,
• and error information

in the Internet Protocol (IP).

Example of ICMP Utility

• Network - Ping

Type

• address-unreachable
• bad-header
• beyond-scope
• communication-prohibited
• destination-unreachable
• echo-reply
• echo-request
• failed-policy
• fragmentation-needed
• host-precedence-violation
• host-prohibited
• host-redirect
• host-unknown
• host-unreachable
• ip-header-bad
• neighbour-advertisement
• neighbour-solicitation
• network-prohibited
• network-redirect
• network-unknown
• network-unreachable
• no-route
• packet-too-big
• parameter-problem
• port-unreachable
• precedence-cutoff
• protocol-unreachable
• redirect
• reject-route
• required-option-missing
• router-advertisement
• router-solicitation
• source-quench
• source-route-failed
• time-exceeded
• timestamp-reply
• timestamp-request
• tos-host-redirect
• tos-host-unreachable
• tos-network-redirect
• tos-network-unreachable
• ttl-zero-during-reassembly
• ttl-zero-during-transit
• unknown-header-type
• unknown-option