[ns] same RTTs!!

[d d]

Hi,
   
  I use tcl to compute the RTT of sender node in dumbbell topology(rtt_) . The duration of simulation was 10.0. The problem here is that all of them is 0.630 or 0.620. Why all of them are the same? I must mentioned that I use of various traffic source in various time.
   
  Regards,
  d.w.

       
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