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TCP/IP Guide by Charles M. Kozierok

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Chapter 33. ICMPV4 INFORMATIONAL MESSAGE TYPES AND FORMATS

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The five Internet Control Message Protocol (ICMP) error message types we examined in the previous chapter communicate important information about error or problem conditions encountered during the operation of an Internet Protocol (IP) internetwork. In contrast, the other class of ICMP messages contains those messages that are informational. They are not sent in response to some issue with a regular IP datagram, but are used on their own to implement various support functions for IP. Informational messages are used for testing and diagnostic purposes, as well as for allowing devices to ...

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