diff -r 4ddcca845f07 src/applications/onoff/onoff-application.cc
--- a/src/applications/onoff/onoff-application.cc	Fri Nov 28 17:42:10 2008 +0100
+++ b/src/applications/onoff/onoff-application.cc	Mon Dec 01 17:08:52 2008 -0500
@@ -177,13 +177,15 @@
   NS_LOG_FUNCTION_NOARGS ();
 
   ScheduleNextTx();  // Schedule the send packet event
+  ScheduleStopEvent();
 }
 
 void OnOffApplication::StopSending()
 {
   NS_LOG_FUNCTION_NOARGS ();
+  CancelEvents();
 
-  Simulator::Cancel(m_sendEvent);
+  ScheduleStartEvent();
 }
 
 // Private helpers