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Scheduler going back in time



Hi everyone,

I have 2 questions about ns.
 
(a) Sometimes, I get the message that ns scheduler is going back in time from t1 to t2. Does anyone know what is the cause of this?
 
(b) When I have many packets in the simulation, the simulation 'hangs' sometimes, and ns does not exit normally. Is there a memory limitation in ns?
 
I would appreciate any reply very very much.
 
rgds
HP Tan