--- a/src/applications/v4ping/v4ping.cc	Wed Nov 26 13:13:24 2008 +0100
+++ b/src/applications/v4ping/v4ping.cc	Wed Nov 26 04:27:10 2008 -0800
@@ -149,6 +149,7 @@
 V4Ping::StopApplication (void)
 {
   NS_LOG_FUNCTION (this);
+  m_socket->Close ();
 }