From the course: Wireshark Essential Training
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Comprehending ICMP - Wireshark Tutorial
From the course: Wireshark Essential Training
Comprehending ICMP
- [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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Contents
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Understanding the TCP-IP suite1m 48s
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(Locked)
Explaining Transmission Control Protocol7m 44s
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(Locked)
Recognizing the TCP connection process1m 34s
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(Locked)
Viewing the TCP handshake and teardown5m 25s
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(Locked)
Breaking down User Datagram Protocol5m 12s
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(Locked)
Outlining IPv44m 13s
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Dissecting IPv63m 41s
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Comprehending ICMP5m 32s
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(Locked)
Discovering ICMPv64m 39s
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(Locked)
Challenge: Evaluating a pcap39s
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(Locked)
Solution: Evaluating a pcap5m 52s
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