[ns] how to implement overhearing by neighborhood nodes in manet protocol( DSR )?

[Sangameshwar Alladi]

how to implement overhearing in DSR?
i am not getting how to over hear the transmissions of neighbor node?
According to my knowledge a node stores only the address or handle of the
downstream node only, then how can an upstream node may receive the
transmission of its downstream node?

and also i need to know how can all the nodes in the radio range of the
transmitting downstream node receive a packet?

Help me.

From:~
Sangameshwar Srinivas Alladi