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[ns] delay command in NS




What I want to simulate now is to have a FTP  traffic source. It
generate 20 packets, each of 1000 bytes. It waits until transmission
finished.  Then it delays an random time (let's say 30 seconds in
average, stands for user reading time) before keep produce another more
20 packets.

Can anyone tell me, if NS know when FTP finishes transmission , and
what is the command  to do "Delay 30 second "  in  NS.

Thanks