[ns] limiting the neighboring radius in NS2.33:please help

[Nadine Chen]

Hi all,
As you know, we can detect neighboring nodes, by sending and
receiving hello messages like what is done in AODV example.But when I did
this, I noticed that each node has a very large number of neighbors, so I want to limit this number by reducing the neighboring radius, but I didn't know where can I modify it?
Please , if any one has an idea to limit automatically this radius, or any other method to reduce the number of neighbours tell me how ?
Thank you very much for your help