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Scheduler going backwards in time



Hello, all

I am running some multicast simulations using ns2. My experiment were
designed to iterate 100 times. However, in the middle of the experiment,
the simulator was terminated due to scheduler going backward in time, the
message is appeared as the following:

ns: scheduler going backwards in time from 28.201484 to 28.030459.

Does anyone know what could be the possible causes for the scheduler going
backward? Anyone has any clue? 

tks.

shuqian