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  • One layer of the protocol stack is fixed to a given endianess (UDP is Big Endian, for example, PROFINET IO CM Blocks are Big Endian too)
  • Endianess of fields are dependent on some parsed values (In DCE/RPC there is a 4 bit field, that controlls if the following fields are BigEndian or LittleEndian)
  • Endianess of all fields of a complex type are dependent on the endianess of the parten parent (In case of PROFINET IO CM the ProfinetIO CM packet has the same endianess of the DCE/RPC packet that contains it)