[ns] Getting different throughput with different CBR interval?

[AIG]

Does anyone know why I am getting different throughput when I set the CBR
interval to different values?
For example, if I set

$cbr set interval_ 0.001
$cbr set interval_ 0.01
$cbr set interval_ 0.1

I get different throughputs. Anyone has an idea why?

[ns] Backoff values in a trace file?

[AIG]

Is the backoff value a node chooses recorded in the trace file? If not, is
there any way I could obtain all the backoff values chosen by one (or all)
nodes??

Thanks

[ns] Getting the same trace file over and over?

[AIG]

Hi,

I have very simple scenario, 5 nodes sending CBR traffic to a sink (I am
only looikng at MAC layer). Every time I run the tcl file, I get the exact
same trace file. However, this should not be the case since 802.11 chooses
random backoff value, and, therefore, the trace should be differnt at every
run. Does anyone have an idea what I am doing wrong?

Thanks.