Telematics Chapter 6: Network Layer - Freie Universität Berlin

ICMP: Header
● ICMP transmits error and control messages on the network level. These
messages are sent in an IP packet
● Type/code indicates the type (and format) of the message, e.g.:
Type Meaning
0 Destination unreachable (packet cannot be sent)
3 Echo request/reply (status request, e.g. for ping)
4 Source Quench (Choke packet, data rate reduction)
11 Time exceeded for datagram (TTL = 0, the packet is discarded)
12 Parameter problem on datagram (A header field is set wrongly)
15/16 Information Request/Reply
30 Trace route (Trace the network path)
Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 6: Network Layer
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