[ns] How to enable HELLO message in AODV ?

[Heo Heo]

  Could anyone let me know how to enable Hello message in AODV ?
   
  I read from a post somewhere that Hello message is not enabled by 
default.
   
  After having it enabled, how should I find out the Hello message in 
the trace file ?
   
  Thanks a lot for your help.

                
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