Telematics Chapter 6: Network Layer - Freie Universität Berlin

Fragmentation
● A too large or too small packet length prevents a good performance. Additionally
there are often size restrictions (buffer, protocols with length specifications,
standards, allowed access time to a channel,…)
● The data length must be a multiple of 8 byte. Exception: the last fragment, only
the remaining data are packed, padding to 8 byte units is not applied.
● If the “DF”-bit is set, the fragmentation is prevented.
ID Flags Offset Data
777 x00 0 0 1200 bytes
IP header
777 x01 0 0 511
777 x01 64 512 1023
Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 6: Network Layer
777 x00 128 1024 1200
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