[ns] how to identify a data packet in ns2

[fatma louati]

Hi everybody,
  I wonder can I identify a data pachet? I mean I already have source and destination adress, but is there any field which indicates that I'm receiving a data packet belongs to this or that traffic.
  I'm working on AODV routing protocol and I need to identify the pachet of data.
  Any help will be very welcome.
  Best regards and thkx in adcance.
  FATMA
   

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