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| Description: | Internet Control Message Protocol. ICMP is part of the IP protocol, and is used to send anomaly reports and control messages. ICMP messages are generated automatically when errors occur in the transmission such as: - no route to the destination - route loop - errors in packet headers The main 'user interface' to ICMP is the ping program, which sends ICMP ECHO packets and expects ICMP ECHO REPLY packets. The complete definition of ICMP standard can be found at http://www.ietf.org/rfc/rfc792.txt. |