[ns] packetsize

[Nicole Zhu]

Hi
In the tutorial "the first TCL script", there is one command "$cbr0 set 
packetSize_ 500".
The question is if I want to change the packetsize every 10s in the same TCL 
script, can I put the command
"$cbr0 set packetSize_ $packetSize_+100"? if not, how can I achieve that 
aim?

Hope to hear from you soon!Urgent!
Cheers!
Xiaoyan Zhu

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