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Questions on ns



Hi,
 
I want to run simple-wireless.tcl from the tutorial in the web.
In the mean time, I got some msg like this.
 
invalid command name "Topography"
    while executing
"Topography create _o10 "
    invoked from within
"catch "$className create $o $args" msg"
    (procedure "new" line 3)
    invoked from within
"new Topography"
    (file "simple-wireless.tcl" line 62)
 
To do this simulation, what do I have to do?
In addition, please let me know the program development plan
for wireless and satellite network and how to install current
snapshot for those programs.
 
Thank you,
Jong-Seon