Re: [ns] Expo Error model always gives the same transfer time

[Alefiya Hussain <alefiyah@catarina.usc.edu>]

To generate random values in ns use

ns-random 0 

before you create ErrorMode/Expo. 

all the best,
alefiya

On Tue, 1 May 2001, gmc50 wrote:

> Hi,
> 
> I try to use the ErrorMode/Expo to generate random errors in a
> duplex-link but, monitoring the throughput and time it takes to send,
> say, 4MBytes, I always get the same results for all my runs (e.g. 6
> runs). Does anybody know why this happens and how I can get different
> values for each run?
> 
> The code I use to generate the errors is:
> 
> set rate [list 20 2]
> set unit pkt
> set rate2 [list 50 3]
> set ExpoLossModule1 [new ErrorMode/Expo $rate $unit]
> $ns link-lossmodel $ExpoLossModule1 $n0 $n1
> set ExpoLossModule2 [new ErrorMode/Expo $rate $unit]
> $ns link-lossmodel2 $ExpoLossModule1 $n1 $n0
> 
> Any ideas would be very appreciated. Thank you very much,
> 
> Gustavo.
>