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Comprehending ICMP

Comprehending ICMP - Wireshark Tutorial

From the course: Wireshark Essential Training

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Comprehending ICMP

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- [Instructor] ICMP or Internet Control Message Protocol resides at the network layer of the OSI model. ICMP is an integral part of the internet protocol and must be implemented by every IP module, as it's part of the original RFC. The fact is the internet protocol would be nothing without ICMP. It's a very important protocol. With ICMP, there is no data exchanged. It's simply error reporting. And it's also used by the utility ping for echo request, echo reply messages. As we see here in this graphic, we can split the ICMP messages in two categories, error reporting and queries. For error reporting, you could have things such as destination unreachable, source quench, or time exceeded. For the query, you'd see echo request reply, timestamp, or address mask. ICMP messages are transmitted within an IP datagram. So here we see an illustration of the IP header followed by the ICMP message. within that ICMP message…

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