[ns] Big Trace File Problem

[Devendra Goyal <goyald@email.uc.edu>]

Hi - Could someone explain how this situation can happen?  Its an Ethernet
LAN simulation trace data.
It looks like this packet is being received 3 times and dropped once.  How
can this happen?  How do I consider this in my drop rate calculation?  Is
this packet considered as a dropped packet event though it seems to have
been received correctly?  This happens quite a bit, so I don't think it
can be ignored.

type  time     from_node to_node size  src_addr dest_addr seq_num pack_id
h     0.019481 4    	 8         1500 4      7.4   6    49
+     0.019581 4         8         1500 4      7.4   6    49
-     0.173205 4         8         1500 4      7.4   6    49
r     0.17699  8         7         1500 4      7.4   6    49
r     0.179508 8         7         1500 4      7.4   6    49
r     0.181958 8         7         1500 4      7.4   6    49
d     0.40687  4         8         1500 4      7.4   6    49

Thanks,

DEV