hello everybody
  sorry for asking two questions in two mails
  i am confused !!
  1) what is the definition of neighbor in reality,
   
  a)the node x is neighbor to node y <----> y can receive the HELLO paquets 
from x
   
  or
   
  b)the node x is neighbor of y <-->  distance(x,y)< 250
   
  2) and what is the definition is used in ns2?
  3) if we considered the obstacls ,the definition b still good,or we must 
changing the definition ?
   
  Please help me,thaks a lot
   

                
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