Checksum in Simulink UDP

Hi All,

I have successfully set up a UDP communication between a simulink model running on a PC and xPC target. My questions is is checksum automatically calculated and packaged with the data to send over? According to RFC768, there is a checksum field in the data packet. I am not sure if I should calculate and add to the data or Simulink blocks are already generating and checking the checksum.

Thank you,

Lynn