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Icmp Time Exceeded




Time exceeded messages are used by the Traceroute utility to identify gateways on the path between two hosts.




































00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31







Type = 11 Code Header Checksum





unused





Internet Header + 64 bits of Original Data Datagram


Type must be set to 11. The code, which specifies the reason for the time exceeded message, include the following:














Code Description
0 Time to live exceeded in transit.
1 Fragment reassembly time exceeded.


The header and first 64 bits of the original payload are used by the source host to match the time exceeded message to the discarded datagram. For higher level protocols such as UDP and TCP the 64 bit payload will include the source and destination ports of the discarded packet.


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