[ns] NS Network capacity

[Diana Benitez]

Dear users:
 
I have a network with capacity of 62 packets (capacity of the link + capacity of the queue).
 
I have 2 users and I trace the size of the windows of each (cwnd_). I think that the sum of this two window size exceeds the capacity there have to be an event of dropping a package. In this case, using TCP, I have an “dupack_action” or a “timeout”.
 
However, there are situations where the sum of the size of the windows of the 2 users (cwnd1 + cwnd2) does not exceeds the capacity and I still have an event of dupack_action.
 
Do someone know why happened the following situation? How the NS2 uses the queue to drop a packet even the sum is not over the maximum capacity of the network?
 
DIANA.
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