TAILIEUCHUNG - Internet Command Message Protocol(ICMP)

Used to communicate IP status and error messages between hosts and routers Uses IP to route its messages between hosts Must be implemented with IP remember, IP is just a packet delivery system transmits and routes datagrams from sources to destinations through a series of interconnected networks it has a checksum in the IP header to detect lost bits no error detection on the datagram payload though but has no native mechanism for source host notification This is where ICMP comes in its used to report IP errors to the source host ICMP data is carried as the payload of an IP datagram specifies additional message formats within this area . | Internet Command Message Protocol (ICMP) CS-431 Dick Steflik ICMP Internet Command Message Protocol (ICMP) RFC 792 Used to communicate IP status and error messages between host and routers ICMP Used to communicate IP status and error messages between hosts and routers Uses IP to route its messages between hosts Must be implemented with IP remember, IP is just a packet delivery system transmits and routes datagrams from sources to destinations through a series of interconnected networks it has a checksum in the IP header to detect lost bits no error detection on the datagram payload though but has no native mechanism for source host notification This is where ICMP comes in its used to report IP errors to the source host ICMP data is carried as the payload of an IP datagram specifies additional message formats within this area Basic ICMP Header Headers are 32 bits in length; all contain same three fields type - 8 bit message type code thirteen message type are defined code - 8 bit; .

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