[ns] Trace File Format

[jie zhang <skyws_hn@yahoo.com>]

Hello,
   I generated a tracefile,some entries like this:

   1:   r 0.51032 0 2 tcp 40 ------- 1 0.0 3.0 0 0
   2:   + 0.51032 2 3 tcp 40 ------- 1 0.0 3.0 0 0
   3:   - 0.51032 2 3 tcp 40 ------- 1 0.0 3.0 0 0
   4:   r 0.52064 2 3 tcp 40 ------- 1 0.0 3.0 0 0
   5:   + 0.52064 3 2 ack 40 ------- 1 3.0 0.0 0 1 
   6:   - 0.52064 3 2 ack 40 ------- 1 3.0 0.0 0 1 

   The topology is: 

          n0--
               \
                \
                  n2--------n3
                /
               /
           n1--

   The problem is: How can I distinguish line 1 and
line 4.They are both "r",but the first "r" happened
between 0 and 2,the second "r" happened between 2 and
3.From ns manual, I know "+" represents enqueue,"-"
represents dequeue,I think "r" represent a packet
receive at an Agent,is it right?
   
  Thanks 

Sincerely yours,
Jiezhang

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