Penguin
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Acronym for Internet Control Message Protocol defined in RFC:792

These are messages generated by an IP stack. They have an IP protocol type of 0x01.

The different types of ICMP are:

|ICMP Type|Description |0|ICMP Echo reply |1| |2| |3|DestinationUnreachable |4|SourceQuench? |5|ICMPRedirect |6|AlternativeHostAddress |7| |8|ICMP Echo Request |9|RouterAdvertisement? |10|RouterSelection? |11|TimeToLiveExceeded |12|ParameterProblem? |13|ICMPTimestamp |14|ICMPTimestampReply |15|InformationRequest? |16|InformationReply? |17|AddressMaskRequest |18|AddressMaskReply |19-29| |30|Traceroute |31|DatagramConversionError? |32|MobileHostRedirect? |33|IPv6 WhereAreYou? |34|IPv6 IAmHere? |35|MobileRegistrationRequest? |36|MobileRegistrationReply? |37|DomainNameRequest? |38|DomainNameReply? |39|SKIP