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ICMP Message Types and Formats
The Internet Control Message Protocol
(ICMP) provides a mechanism for error reporting and the exchange of
important information between IP devices. Many different message types
exist within ICMP, which have certain common attributes that we saw
in the
section discussing ICMP generalities.
Beyond these commonalities, the details of how ICMP messages are created
and used diverge based on the specific message type, so it's time to
look at these and see how they work.
In this section I provide specific
details on the most commonly-seen ICMP message types, including a description
of both their use and their specific message formats. There are 20 different
message types currently covered, so they have been divided into four
subsections for better organization. These correspond to the four combinations
of ICMP version (ICMPv4 and ICMPv6) and message class (error and informational).
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Quick navigation to subsections and regular topics in this section
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Version 3.0 - Version Date: September 20, 2005
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Related Information: For a cross-reference of message types and corresponding ICMP Type field values,