diff -r 47d35a36e615 src/applications/v4ping/v4ping.cc
--- a/src/applications/v4ping/v4ping.cc	Wed Jul 21 20:26:48 2010 +0100
+++ b/src/applications/v4ping/v4ping.cc	Thu Jul 22 16:28:43 2010 +0100
@@ -195,6 +195,10 @@
   Icmpv4Header header;
   header.SetType (Icmpv4Header::ECHO);
   header.SetCode (0);
+  if (Node::ChecksumEnabled ())
+  {
+	  header.EnableChecksum ();
+  }
   p->AddHeader (header);
   m_sent.insert (std::make_pair (m_seq - 1, Simulator::Now()));
   m_socket->Send (p, 0);