--- a/src/internet/model/ipv4-l3-protocol.cc	Tue Oct 18 10:18:26 2011 -0400
+++ b/src/internet/model/ipv4-l3-protocol.cc	Tue Oct 18 18:18:23 2011 -0400
@@ -1168,6 +1168,11 @@
       fragmentHeader.SetFragmentOffset (offset);
       fragmentHeader.SetPayloadSize (currentFragmentablePartSize);
 
+      if (Node::ChecksumEnabled ())
+        {
+          fragmentHeader.EnableChecksum ();
+        }
+
       NS_LOG_LOGIC ("Fragment check - " << fragmentHeader.GetFragmentOffset ()  );
 
       NS_LOG_LOGIC ("New fragment Header " << fragmentHeader);