--- a/src/devices/emu/emu-net-device.cc	Mon Aug 16 17:41:03 2010 -0400
+++ b/src/devices/emu/emu-net-device.cc	Tue Aug 17 21:28:08 2010 -0700
@@ -211,6 +211,10 @@
 EmuNetDevice::DoDispose()
 {
   NS_LOG_FUNCTION_NOARGS ();
+  if (m_readThread != 0)
+    {
+      StopDevice ();
+    }
   m_node = 0;
   NetDevice::DoDispose ();
 }