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[ns] Cannot see packets in nam visulazation



Hi all,
I'm working with ns-allinone-2.1b7a under Linux Red Hat 6.2 and I can't see the packet flow of the example (from ../ns-2.1b7a/tcl/ex) "wireless-pkt-demo.tcl" (with title:  A simple example for visualization of packet flow in wireless simulation)  in the nam visualization. I only see the nodes movement. This also happens in other examples. 
Could you tell the reason, please?
Thank you.