title: How can I monitor a flow over wireless connection?
body: <p>I am trying to monitor a tcp flow using flow monitor. attach-fmon wants link object which is not available in wireless connections. How can I solve this problem ? Are there any other solutions ?</p>
  
  <p>My code is here
  <a href="http://pastebin.com/f59241692" rel="nofollow noreferrer">http://pastebin.com/f59241692</a></p>
  
  <p>I got this error message</p>
  
  <pre><code>eid@eid-laptop:~/code/ns2/noisy$ ns mixed.tcl
  num_nodes is set 3
  INITIALIZE THE LIST xListHead
  invalid command name ""
      while executing
  "$lnk attach-monitors $isnoop $osnoop $dsnoop $fm"
      (procedure "_o3" line 5)
      (Simulator attach-fmon line 5)
      invoked from within
  "$ns_ attach-fmon $wllink $fmon"
      (file "mixed.tcl" line 182)
  </code></pre>