--- a/src/common/packet.cc	Sun Jul 05 22:16:08 2009 +0800
+++ a/src/common/packet.cc	Sun Jul 05 22:07:14 2009 +0800
@@ -629,10 +629,10 @@ 
   m_packetTagList.Add (tag);
 }
 bool 
-Packet::RemovePacketTag (Tag &tag)
+Packet::RemovePacketTag (Tag &tag) const
 {
   NS_LOG_FUNCTION (this << tag.GetInstanceTypeId ().GetName () << tag.GetSerializedSize ());
-  bool found = m_packetTagList.Remove (tag);
+  bool found = const_cast<PacketTagList*>(&m_packetTagList)->Remove (tag);
   return found;
 }
 bool 
--- a/src/common/packet.h	Sun Jul 05 22:16:08 2009 +0800
+++ a/src/common/packet.h	Sun Jul 05 22:07:14 2009 +0800
@@ -490,7 +490,7 @@ 
    * Remove a tag from this packet. This method calls
    * Tag::Deserialize if the tag is found.
    */
-  bool RemovePacketTag (Tag &tag);
+  bool RemovePacketTag (Tag &tag) const;
   /**
    * \param tag the tag to search in this packet
    * \returns true if the requested tag is found, false