[ns] how can I disable routing protocols in ns?

[seba]

Hello All,
I am working in a project where wireless ad hoc networks are involved in.
My problem is that, when two nodes are not in the same trasmission range (250 m) I do not want them to exchange packets. 
"Unfortunately" thanks to the routing protocol, if there's a node in the middle, the two nodes far away each other can exchange packets anyway.
How could I disable the routing mechanism?

Thank in advance for any reply,
Seba


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