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Icmp Message Internet Control Protocol Communication Events Network

Front ICMP
Back Internet Control Message Protocol

- Communication of events on the network level
- Fault feedback (unreachable host / port)
- Echo Inquiries / Answers (Ping [Reply: Type 0, Code 0])

- Traceroute: Router sends ICMP message at TTL = 0
- Structure: Type, Code, First 8 bytes of the datagram which caused the ICMP message

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