[ns] Why does 'RandomVariable()' return same values everytime?

[Shashank SVRSN]

Hi!

I am a new user to NS-3. I see that in every run, the method
'RandomVariable()' returns same values. How can one expect it to be a
random value generator?

Please tell me if this is just an issue on my side

Thanking you

Regards
Shashank