[ns] How can i change the rate of a tcp/ftp traffic generator? PLEASE HELP?

[gv fg]

Hi,
i wnat tin a natework to use tcp with ftp traffic generatow and i want o 
change its rate.
How can i do that?
if there is no way to do that what traffic generator can i use with the tcp 
agent to control the rate?
Thanks in advance

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