[ns] Multicast trace file : HELP !!!!

[Vijayan Ramakrishnan <vramakri@cs.uiowa.edu>]

 Hi All

  I am trying to get average packet duration for all multicast packets
  received from source. It is really hard to figure out the seqno &
  packet_id as all intermediate nodes start the seqno as '0' again and
  does anyone have a script or idea to capture the results ...
  It becomes more complicated when multiple sources send data.
  I have included the "script" i use below. 
  I am not sure if it is completely perfect !!

  Thanks for the time !!
  Any help is highly appreciated ..

- vijayan

========================================================================
- SCRIPT TO CAPTURE AVERAGE PACKET DURATION FOR MULTICAST DATA PACKETS
- Disclaimer : not sure if it is correct !!!!
=========================================================================

BEGIN {
  highest_packet_id = 0;
  for ( packet_id = 0; packet_id <= 800; packet_id++ ) {
    for ( node = 0; node <= 50 ; node ++ ) {
       end_time[node, packet_id] = 0;
    }
  }
}
{
 action = $1;
 time = $2;
 node_1 = $3;
 node_2 = $4;
 agent = $5;
 flow_id = $6; 
 junk = $7
 source = $8
 node_1_address = $9;
 node_2_address = $10; 
 seq_no = $11;
 packet_id = $12;

 pid = (packet_id+1) / 2;

 if ( pid > hpid ) hpid = pid;

 if ( action != "d" ) {
  if ( action == "r" ) {
    if ( $5 == "encap" ) start_time[pid] = time;
    if ( $5 == "cbr" ) end_time[node_2, seq_no] = time;
  }
 } else {
   end_time[node_2, seq_no] = -1;
   }
} 
END {
 for ( packet_id = 0; packet_id <= hpid; packet_id++ ) {
   packet_duration = 0;
   start = start_time[packet_id];
   for ( node = 0; node <= 50 ; node ++ ) {
     if ( end_time[node,packet_id] == 0 ) continue;
       end = end_time[node, packet_id];
       packet_duration += end - start;
  }

# there are 20 receivers
  if ( start < end ) printf("%d %f %f\n", packet_id, start,packet_duration/20);
 }
}

================================================================================