diff -Naur src/helper/ipv4-interface-container.cc ../../ns-3.2/src/helper/ipv4-interface-container.cc
--- src/helper/ipv4-interface-container.cc	2008-09-22 12:45:12.000000000 -0500
+++ ../../ns-3.2/src/helper/ipv4-interface-container.cc	2008-10-08 14:54:25.000000000 -0500
@@ -11,6 +11,32 @@
 {
   return m_interfaces.size ();
 }
+//====Abdul Code=============
+void
+Ipv4InterfaceContainer::SetDown (uint32_t i)
+{
+  Ptr<Ipv4> ipv4 = m_interfaces[i].first;
+  uint32_t interface = m_interfaces[i].second;
+//  cout << interface << endl;
+  return ipv4->SetDown (interface);
+}
+
+Ptr<Ipv4> 
+Ipv4InterfaceContainer::Get (uint32_t i) const
+{
+  Ptr<Ipv4> ipv4 = m_interfaces[i].first;
+  return ipv4;
+}
+
+uint32_t
+Ipv4InterfaceContainer::GetInterface(uint32_t i) const
+{
+  uint32_t interface = m_interfaces[i].second;
+  return interface;
+}
+
+//==========================
+
 Ipv4Address 
 Ipv4InterfaceContainer::GetAddress (uint32_t i) const
 {
diff -Naur src/helper/ipv4-interface-container.h ../../ns-3.2/src/helper/ipv4-interface-container.h
--- src/helper/ipv4-interface-container.h	2008-09-22 12:45:12.000000000 -0500
+++ ../../ns-3.2/src/helper/ipv4-interface-container.h	2008-10-08 14:54:49.000000000 -0500
@@ -24,7 +24,12 @@
    * \returns the number of interfaces stored in this Ipv4InterfaceContainer.
    */
   uint32_t GetN (void) const;
+//============= Abdul Code==============
+void SetDown (uint32_t i);
+Ptr<Ipv4> Get (uint32_t i) const;
+uint32_t GetInterface(uint32_t i) const;
 
+//============Abdul Code===================
   Ipv4Address GetAddress (uint32_t i) const;
   void SetMetric (uint32_t i, uint16_t metric);