--- a/src/internet-stack/wscript	Wed Jul 02 21:07:36 2008 -0700
+++ b/src/internet-stack/wscript	Thu Jul 03 09:44:23 2008 -0400
@@ -39,4 +39,7 @@
         'udp-header.h',
         'tcp-header.h',
         'sequence-number.h',
+        'ipv4-interface.h',
+        'ipv4-l3-protocol.h',
+        'ipv4-static-routing.h',
         ]

--- a/src/node/ipv4.h	Wed Jul 02 21:07:36 2008 -0700
+++ b/src/node/ipv4.h	Thu Jul 03 09:44:23 2008 -0400
@@ -425,6 +425,11 @@
   /**
    * \param i index of ipv4 interface
    * \returns the address associated to the underlying ipv4 interface
+   *
+   * Note that the broadcast address for this interface may be fetched
+   * from the Ipv4Address object returned here using
+   * Ipv4Address::GetSubnetDirectedBroadcast(mask), where the mask for
+   * the interface may be retrived using Ipv4::GetNetworkMask(i).
    */
   virtual Ipv4Address GetAddress (uint32_t i) const = 0;
 
@@ -432,6 +437,11 @@
    * \param destination The IP address of a hypothetical destination.
    * \returns The IP address assigned to the interface that will be used
    * if we were to send a packet to destination.
+   *
+   * Note that the broadcast address for this interface may be fetched
+   * from the Ipv4Address object returned here using
+   * Ipv4Address::GetSubnetDirectedBroadcast(mask), where the mask for
+   * the interface may be retrived using Ipv4::GetNetworkMask(i).
    */
   virtual Ipv4Address GetSourceAddress (Ipv4Address destination) const = 0;
 

--- a/src/node/node.cc	Wed Jul 02 21:07:36 2008 -0700
+++ b/src/node/node.cc	Thu Jul 03 09:44:23 2008 -0400
@@ -128,6 +128,18 @@
 {
   return m_applications.size ();
 }
+Ptr<Application>
+Node::GetFirstApplication(TypeId tid)
+{
+  for (std::vector<Ptr<Application> >::iterator i = m_applications.begin ();
+       i != m_applications.end (); i++) {
+    Ptr<Application> app = *i;
+    if (app->GetInstanceTypeId() == tid)
+      return app;
+  }
+
+  return 0;
+}
 
 void 
 Node::DoDispose()

--- a/src/node/node.h	Wed Jul 02 21:07:36 2008 -0700
+++ b/src/node/node.h	Thu Jul 03 09:44:23 2008 -0400
@@ -123,6 +123,13 @@
    */
   Ptr<Application> GetApplication (uint32_t index) const;
   /**
+   * \param index
+   * \returns the application associated to this requested index
+   *          within this Node.
+   */
+  Ptr<Application> GetFirstApplication (TypeId tid);
+
+  /**
    * \returns the number of applications associated to this Node.
    */
   uint32_t GetNApplications (void) const;