--- a/src/node/socket.h	Mon Oct 27 15:12:00 2008 -0400
+++ b/src/node/socket.h	Wed Oct 29 11:18:39 2008 -0700
@@ -336,9 +336,9 @@
    * not preserved.  
    * 
    * The flags argument is formed by or'ing one or more of the values:     
-   *        MSG_OOB        process out-of-band data
-   *        MSG_PEEK       peek at incoming message
-   * These flags are _unsupported_ as of ns-3.1.  
+   *        MSG_OOB             process out-of-band data
+   *        MSG_PEEK            peek at incoming message
+   * None of these flags are supported for now.
    *
    * Some variants of Recv() are supported as additional API,
    * including RecvFrom(), overloaded Recv() without arguments,
@@ -555,6 +555,29 @@
   uint8_t m_ttl;
 };
 
+
+/**
+ * \brief indicated whether packets should be sent out with
+ * the DF flag set.
+ */
+class SocketSetDontFragmentTag : public Tag
+{
+public:
+  SocketSetDontFragmentTag ();
+  void Enable (void);
+  void Disable (void);
+  bool IsEnabled (void) const;
+
+  static TypeId GetTypeId (void);  
+  virtual TypeId GetInstanceTypeId (void) const;
+  virtual uint32_t GetSerializedSize (void) const;
+  virtual void Serialize (TagBuffer i) const;
+  virtual void Deserialize (TagBuffer i);
+  virtual void Print (std::ostream &os) const;
+private:
+  bool m_dontFragment;
+};
+
 } //namespace ns3
 
 #endif /* SOCKET_H */