ipv4-global-routing-test-suite.cc

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <vector>
#include "ns3/boolean.h"
#include "ns3/config.h"
#include "ns3/inet-socket-address.h"
#include "ns3/internet-stack-helper.h"
#include "ns3/ipv4-address-helper.h"
#include "ns3/ipv4-global-routing-helper.h"
#include "ns3/ipv4-static-routing-helper.h"
#include "ns3/node.h"
#include "ns3/log.h"
#include "ns3/node-container.h"
#include "ns3/packet.h"
#include "ns3/simple-net-device-helper.h"
#include "ns3/pointer.h"
#include "ns3/simulator.h"
#include "ns3/string.h"
#include "ns3/test.h"
#include "ns3/uinteger.h"
#include "ns3/ipv4-packet-info-tag.h"
#include "ns3/simple-net-device.h"
#include "ns3/simple-channel.h"
#include "ns3/socket-factory.h"
#include "ns3/udp-socket-factory.h"
#include "ns3/ipv4-l3-protocol.h"
#include "ns3/ipv4-routing-protocol.h"
#include "ns3/ipv4-routing-table-entry.h"
#include "ns3/ipv4-global-routing.h"
#include "ns3/bridge-helper.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("Ipv4GlobalRoutingTestSuite");

// This test suite tests the operation of global routing on a few sample
// networks to ensure that routes are built correctly
//
//  Link test:
//      n0 <--------> n1  (point-to-point link)
//  10.1.1.1        10.1.1.2
//      Expected routes:
//         n0:  route to 0.0.0.0 gw 10.1.1.2
//         n1:  route to 0.0.0.0 gw 10.1.1.1
//      Note:  These default routes to 0.0.0.0 are generated by the extension
//             in the global route manager to install default routes via the
//             peer node on a point-to-point link, when the node is on a 
//             stub link
//
//  LAN test:
//      n0 <--------> n1  (broadcast link on subnet 10.1.1.0/24)
//      Expected routes:
//         n0:  route to 10.1.1.0 gw 0.0.0.0
//         n1:  route to 10.1.1.0 gw 0.0.0.0
//  Two link test:
//      n0 <--------> n1 <--------> n2  (point-to-point links)
//  10.1.1.1       10.1.1.2/     10.1.2.2
//                 10.1.2.1        
//      Expected routes:
//         n0:  route to 0.0.0.0 gw 10.1.1.2
//         n1:  route to 10.1.1.1 gw 10.1.1.1
//              route to 10.1.2.2 gw 10.1.2.2
//              route to 10.1.1.0 gw 10.1.1.1
//              route to 10.1.2.0 gw 10.1.2.2
//         n2:  route to 0.0.0.0 gw 10.1.2.1
//      Note:  These default routes to 0.0.0.0 are generated by the extension
//             in the global route manager to install default routes via the
//             peer node on a point-to-point link, when the node is on a
//             stub link
//  Two LANs test:
//      n0 <--------> n1 <--------> n2  (broadcast links)
//      Expected routes:
//         n0:  route to 10.1.1.0 gw 0.0.0.0
//              route to 0.0.0.0 gw 10.1.1.2
//         n1:  route to 10.1.1.1 gw 10.1.1.1
//              route to 10.1.2.2 gw 10.1.2.2
//              route to 10.1.1.0 gw 10.1.1.1
//              route to 10.1.2.0 gw 10.1.2.2
//         n2:  route to 0.0.0.0 gw 10.1.2.1
//  Bridge test:
//      n0 <--------> n1 <---> Bridge-n2 <---> n3 <-------> n4 (broadcast links)
//         10.1.1.0/24        10.1.2.0/24        10.1.3.0/24
//      Expected routes:
//         n0:  route to 10.1.1.0 gw 0.0.0.0
//              route to 10.1.2.0 gw 10.1.1.2
//              route to 10.1.3.0 gw 10.1.1.2
//         n1:  route to 10.1.1.0 gw 0.0.0.0
//              route to 10.1.2.0 gw 0.0.0.0
//              route to 10.1.3.0 gw 10.1.2.2
//         n3:  route to 10.1.1.0 gw 10.1.2.1
//              route to 10.1.2.0 gw 0.0.0.0
//              route to 10.1.3.0 gw 0.0.0.0
//         n4:  route to 10.1.3.0 gw 0.0.0.0
//              route to 10.1.2.0 gw 10.1.3.1
//              route to 10.1.1.0 gw 10.1.3.1
//  Two Bridge test:
//      n0 <------> n1 <---> Bridge-n2 <---> Bridge-n3 <---> n4 (broadcast links)
//         10.1.1.0/24        10.1.2.0/24        
//      Expected routes:
//         n0:  route to 10.1.1.0 gw 0.0.0.0
//              route to 10.1.2.0 gw 10.1.1.2
//         n4:  route to 10.1.2.0 gw 0.0.0.0
//              route to 10.1.1.0 gw 10.1.2.1


class LinkTest : public TestCase
{
public:
  virtual void DoSetup (void);
  virtual void DoRun (void);
  LinkTest ();
private:
  NodeContainer m_nodes; 
};

LinkTest::LinkTest ()
  : TestCase ("Global routing on point-to-point link")
{
}

void
LinkTest::DoSetup ()
{
  m_nodes.Create (2);

  Ptr<SimpleChannel> channel = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper;
  simpleHelper.SetNetDevicePointToPointMode (true);
  NetDeviceContainer net = simpleHelper.Install (m_nodes, channel);

  InternetStackHelper internet;
  // By default, InternetStackHelper adds a static and global routing
  // implementation.  We just want the global for this test.
  Ipv4GlobalRoutingHelper ipv4RoutingHelper;
  internet.SetRoutingHelper (ipv4RoutingHelper);
  internet.Install (m_nodes);

  Ipv4AddressHelper ipv4;
  ipv4.SetBase ("10.1.1.0", "255.255.255.252");
  Ipv4InterfaceContainer i = ipv4.Assign (net);
}

void
LinkTest::DoRun ()
{
  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  Ptr<Ipv4L3Protocol> ip0 = m_nodes.Get (0)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip0, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4L3Protocol> ip1 = m_nodes.Get (1)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip1, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4RoutingProtocol> routing0 = ip0->GetRoutingProtocol ();
  Ptr<Ipv4GlobalRouting> globalRouting0 = routing0->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting0, 0, "Error-- no Ipv4GlobalRouting object");  
  Ptr<Ipv4RoutingProtocol> routing1 = ip1->GetRoutingProtocol ();
  Ptr<Ipv4GlobalRouting> globalRouting1 = routing1->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting1, 0, "Error-- no Ipv4GlobalRouting object");  

  // Test that the right number of routes found
  uint32_t nRoutes0 = globalRouting0->GetNRoutes ();
  NS_LOG_DEBUG ("LinkTest nRoutes0 " << nRoutes0);
  NS_TEST_ASSERT_MSG_EQ (nRoutes0, 1, "Error-- not one route");
  Ipv4RoutingTableEntry* route = globalRouting0->GetRoute (0);
  NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("0.0.0.0"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.1.2"), "Error-- wrong gateway");

  // Test that the right number of routes found
  uint32_t nRoutes1 = globalRouting1->GetNRoutes ();
  NS_TEST_ASSERT_MSG_EQ (nRoutes1, 1, "Error-- not one route");
  NS_LOG_DEBUG ("LinkTest nRoutes1 " << nRoutes1);
  route = globalRouting1->GetRoute (0);
  NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("0.0.0.0"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.1.1"), "Error-- wrong gateway");

  bool result = true;

  NS_TEST_ASSERT_MSG_EQ (result, true, "Message");
  Simulator::Run ();
  Simulator::Destroy ();
}

class LanTest : public TestCase
{
public:
  virtual void DoSetup (void);
  virtual void DoRun (void);
  LanTest ();
private:
  NodeContainer m_nodes; 
};

LanTest::LanTest ()
  : TestCase ("Global routing on broadcast link")
{
}

void
LanTest::DoSetup ()
{
  m_nodes.Create (2);

  Ptr<SimpleChannel> channel = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper;
  NetDeviceContainer net = simpleHelper.Install (m_nodes, channel);

  InternetStackHelper internet;
  // By default, InternetStackHelper adds a static and global routing
  // implementation.  We just want the global for this test.
  Ipv4GlobalRoutingHelper ipv4RoutingHelper;
  internet.SetRoutingHelper (ipv4RoutingHelper);
  internet.Install (m_nodes);

  Ipv4AddressHelper ipv4;
  ipv4.SetBase ("10.1.1.0", "255.255.255.0");
  Ipv4InterfaceContainer i = ipv4.Assign (net);
}

void
LanTest::DoRun ()
{
  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  Ptr<Ipv4L3Protocol> ip0 = m_nodes.Get (0)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip0, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4L3Protocol> ip1 = m_nodes.Get (1)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip1, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4RoutingProtocol> routing0 = ip0->GetRoutingProtocol ();
  Ptr<Ipv4GlobalRouting> globalRouting0 = routing0->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting0, 0, "Error-- no Ipv4GlobalRouting object");  
  Ptr<Ipv4RoutingProtocol> routing1 = ip1->GetRoutingProtocol ();
  Ptr<Ipv4GlobalRouting> globalRouting1 = routing1->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting1, 0, "Error-- no Ipv4GlobalRouting object");  

  // Test that the right number of routes found
  uint32_t nRoutes0 = globalRouting0->GetNRoutes ();
  NS_LOG_DEBUG ("LanTest nRoutes0 " << nRoutes0);
  NS_TEST_ASSERT_MSG_EQ (nRoutes0, 1, "Error-- more than one entry");
  for (uint32_t i = 0; i < globalRouting0->GetNRoutes (); i++)
    {
      Ipv4RoutingTableEntry* route = globalRouting0->GetRoute (i);
      NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
    }

  // Test that the right number of routes found
  uint32_t nRoutes1 = globalRouting1->GetNRoutes ();
  NS_LOG_DEBUG ("LanTest nRoutes1 " << nRoutes1);
  NS_TEST_ASSERT_MSG_EQ (nRoutes1, 1, "Error-- more than one entry");
  for (uint32_t i = 0; i < globalRouting0->GetNRoutes (); i++)
    {
      Ipv4RoutingTableEntry* route = globalRouting1->GetRoute (i);
      NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
    }

  Simulator::Destroy ();
}

class TwoLinkTest : public TestCase
{
public:
  virtual void DoSetup (void);
  virtual void DoRun (void);
  TwoLinkTest ();
private:
  NodeContainer m_nodes; 
};

TwoLinkTest::TwoLinkTest ()
  : TestCase ("Global routing across two hops (point-to-point links)")
{
}

void
TwoLinkTest::DoSetup ()
{
  m_nodes.Create (3);

  Ptr<SimpleChannel> channel = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper;
  simpleHelper.SetNetDevicePointToPointMode (true);
  NetDeviceContainer net = simpleHelper.Install (m_nodes.Get (0), channel);
  net.Add (simpleHelper.Install (m_nodes.Get (1), channel));

  Ptr<SimpleChannel> channel2 = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper2;
  simpleHelper2.SetNetDevicePointToPointMode (true);
  NetDeviceContainer net2 = simpleHelper.Install (m_nodes.Get (1), channel2);
  net2.Add (simpleHelper2.Install (m_nodes.Get (2), channel2));

  InternetStackHelper internet;
  // By default, InternetStackHelper adds a static and global routing
  // implementation.  We just want the global for this test.
  Ipv4GlobalRoutingHelper ipv4RoutingHelper;
  internet.SetRoutingHelper (ipv4RoutingHelper);
  internet.Install (m_nodes);

  Ipv4AddressHelper ipv4;
  ipv4.SetBase ("10.1.1.0", "255.255.255.252");
  Ipv4InterfaceContainer i = ipv4.Assign (net);
  ipv4.SetBase ("10.1.2.0", "255.255.255.252");
  Ipv4InterfaceContainer i2 = ipv4.Assign (net2);
}

void
TwoLinkTest::DoRun ()
{
  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  Ptr<Ipv4L3Protocol> ip0 = m_nodes.Get (0)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip0, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4L3Protocol> ip1 = m_nodes.Get (1)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip1, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4L3Protocol> ip2 = m_nodes.Get (2)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip2, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4RoutingProtocol> routing0 = ip0->GetRoutingProtocol ();
  Ptr<Ipv4GlobalRouting> globalRouting0 = routing0->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting0, 0, "Error-- no Ipv4GlobalRouting object");  
  Ptr<Ipv4RoutingProtocol> routing1 = ip1->GetRoutingProtocol ();
  Ptr<Ipv4GlobalRouting> globalRouting1 = routing1->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting1, 0, "Error-- no Ipv4GlobalRouting object");  
  Ptr<Ipv4RoutingProtocol> routing2 = ip2->GetRoutingProtocol ();
  Ptr<Ipv4GlobalRouting> globalRouting2 = routing2->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting2, 0, "Error-- no Ipv4GlobalRouting object");  

  // node n0
  // Test that the right number of routes found
  uint32_t nRoutes0 = globalRouting0->GetNRoutes ();
  NS_LOG_DEBUG ("TwoLinkTest nRoutes0 " << nRoutes0);
  NS_TEST_ASSERT_MSG_EQ (nRoutes0, 1, "Error-- wrong number of links");

  Ipv4RoutingTableEntry* route = globalRouting0->GetRoute (0);
  NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("0.0.0.0"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.1.2"), "Error-- wrong gateway");

  // node n1
  // Test that the right number of routes found
  uint32_t nRoutes1 = globalRouting1->GetNRoutes ();
  NS_LOG_DEBUG ("TwoLinkTest nRoutes1 " << nRoutes1);
  route = globalRouting1->GetRoute (0);
  NS_LOG_DEBUG ("TwoLinkTest entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.1.1"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.1.1"), "Error-- wrong gateway");
  route = globalRouting1->GetRoute (1);
  NS_LOG_DEBUG ("TwoLinkTest entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.2.2"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.2.2"), "Error-- wrong gateway");
  route = globalRouting1->GetRoute (2);
  NS_LOG_DEBUG ("TwoLinkTest entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.1.0"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.1.1"), "Error-- wrong gateway");
  route = globalRouting1->GetRoute (3);
  NS_LOG_DEBUG ("TwoLinkTest entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.2.0"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.2.2"), "Error-- wrong gateway");

  // node n2
  // Test that the right number of routes found
  uint32_t nRoutes2 = globalRouting2->GetNRoutes ();
  NS_LOG_DEBUG ("TwoLinkTest nRoutes2 " << nRoutes2);
  NS_TEST_ASSERT_MSG_EQ (nRoutes2, 1, "Error-- wrong number of links");

  route = globalRouting2->GetRoute (0);
  NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("0.0.0.0"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.2.1"), "Error-- wrong gateway");

  Simulator::Destroy ();
}

class TwoLanTest : public TestCase
{
public:
  virtual void DoSetup (void);
  virtual void DoRun (void);
  TwoLanTest ();
private:
  NodeContainer m_nodes; 
};

TwoLanTest::TwoLanTest ()
  : TestCase ("Global routing across two hops (broadcast links)")
{
}

void
TwoLanTest::DoSetup ()
{
  m_nodes.Create (3);

  Ptr<SimpleChannel> channel = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper;
  NetDeviceContainer net = simpleHelper.Install (m_nodes.Get (0), channel);
  net.Add (simpleHelper.Install (m_nodes.Get (1), channel));

  Ptr<SimpleChannel> channel2 = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper2;
  NetDeviceContainer net2 = simpleHelper.Install (m_nodes.Get (1), channel2);
  net2.Add (simpleHelper2.Install (m_nodes.Get (2), channel2));

  InternetStackHelper internet;
  // By default, InternetStackHelper adds a static and global routing
  // implementation.  We just want the global for this test.
  Ipv4GlobalRoutingHelper ipv4RoutingHelper;
  internet.SetRoutingHelper (ipv4RoutingHelper);
  internet.Install (m_nodes);

  Ipv4AddressHelper ipv4;
  ipv4.SetBase ("10.1.1.0", "255.255.255.0");
  Ipv4InterfaceContainer i = ipv4.Assign (net);
  ipv4.SetBase ("10.1.2.0", "255.255.255.0");
  Ipv4InterfaceContainer i2 = ipv4.Assign (net2);
}

void
TwoLanTest::DoRun ()
{
  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  Ptr<Ipv4L3Protocol> ip0 = m_nodes.Get (0)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip0, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4L3Protocol> ip1 = m_nodes.Get (1)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip1, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4L3Protocol> ip2 = m_nodes.Get (2)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip2, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4RoutingProtocol> routing0 = ip0->GetRoutingProtocol ();
  Ptr<Ipv4GlobalRouting> globalRouting0 = routing0->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting0, 0, "Error-- no Ipv4GlobalRouting object");  
  Ptr<Ipv4RoutingProtocol> routing1 = ip1->GetRoutingProtocol ();
  Ptr<Ipv4GlobalRouting> globalRouting1 = routing1->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting1, 0, "Error-- no Ipv4GlobalRouting object");  
  Ptr<Ipv4RoutingProtocol> routing2 = ip2->GetRoutingProtocol ();
  Ptr<Ipv4GlobalRouting> globalRouting2 = routing2->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting2, 0, "Error-- no Ipv4GlobalRouting object");  

  // Test that the right number of routes found
  uint32_t nRoutes0 = globalRouting0->GetNRoutes ();
  NS_LOG_DEBUG ("TwoLanTest nRoutes0 " << nRoutes0);
  NS_TEST_ASSERT_MSG_EQ (nRoutes0, 2, "Error-- not two entries");
  Ipv4RoutingTableEntry* route = globalRouting0->GetRoute (0);
  NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.1.0"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("0.0.0.0"), "Error-- wrong gateway");
  route = globalRouting0->GetRoute (1);
  NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.2.0"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.1.2"), "Error-- wrong gateway");

  // Test that the right number of routes found
  uint32_t nRoutes1 = globalRouting1->GetNRoutes ();
  NS_LOG_DEBUG ("TwoLanTest nRoutes1 " << nRoutes1);
  NS_TEST_ASSERT_MSG_EQ (nRoutes1, 2, "Error-- not two entries");
  route = globalRouting1->GetRoute (0);
  NS_LOG_DEBUG ("TwoLanTest entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.1.0"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("0.0.0.0"), "Error-- wrong gateway");
  route = globalRouting1->GetRoute (1);
  NS_LOG_DEBUG ("TwoLanTest entry dest " << route->GetDest () << " gw " << route->GetGateway ());
  NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.2.0"), "Error-- wrong destination");
  NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("0.0.0.0"), "Error-- wrong gateway");

  Simulator::Destroy ();
}

class BridgeTest : public TestCase
{
public:
  virtual void DoSetup (void);
  virtual void DoRun (void);
  BridgeTest ();
private:
  NodeContainer m_nodes; 
};

BridgeTest::BridgeTest ()
  : TestCase ("Global routing across bridging topology (bug 2102)")
{
}

void
BridgeTest::DoSetup ()
{
  m_nodes.Create (5);

  //connect node0 to node1
  Ptr<SimpleChannel> channel = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper;
  NetDeviceContainer net = simpleHelper.Install (m_nodes.Get (0), channel);
  net.Add (simpleHelper.Install (m_nodes.Get (1), channel));

  NetDeviceContainer bridgeFacingDevices;
  NetDeviceContainer switchDevices;

  //connect node1 to node2 (switch)
  Ptr<SimpleChannel> channel2 = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper2;
  NetDeviceContainer net2 = simpleHelper2.Install (m_nodes.Get (1), channel2);
  net2.Add (simpleHelper2.Install (m_nodes.Get (2), channel2));
  bridgeFacingDevices.Add (net2.Get (0));
  switchDevices.Add (net2.Get (1));

  //connect node2 (switch) to node3
  Ptr<SimpleChannel> channel3 = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper3;
  NetDeviceContainer net3 = simpleHelper3.Install (m_nodes.Get (2), channel3);
  net3.Add (simpleHelper3.Install (m_nodes.Get (3), channel3));
  bridgeFacingDevices.Add (net3.Get (1));
  switchDevices.Add (net3.Get (0));

  //connect node3 to node4
  Ptr<SimpleChannel> channel4 = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper4;
  NetDeviceContainer net4 = simpleHelper4.Install (m_nodes.Get (3), channel4);
  net4.Add (simpleHelper4.Install (m_nodes.Get (4), channel4));

  Ptr<Node> switchNode = m_nodes.Get (2);
  BridgeHelper bridge;
  bridge.Install (switchNode, switchDevices);

  InternetStackHelper internet;
  // By default, InternetStackHelper adds a static and global routing
  // implementation.  We just want the global for this test.
  Ipv4GlobalRoutingHelper ipv4RoutingHelper;
  internet.SetRoutingHelper (ipv4RoutingHelper);

  internet.Install (m_nodes.Get (0));
  internet.Install (m_nodes.Get (1));
  // m_nodes.Get (2) is bridge node
  internet.Install (m_nodes.Get (3));
  internet.Install (m_nodes.Get (4));

  Ipv4AddressHelper address;
  address.SetBase ("10.1.1.0", "255.255.255.0");
  address.Assign (net);

  address.SetBase ("10.1.2.0", "255.255.255.0");
  address.Assign (bridgeFacingDevices);

  address.SetBase ("10.1.3.0", "255.255.255.0");
  address.Assign (net4);

}

void
BridgeTest::DoRun ()
{
  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  Ptr<Ipv4L3Protocol> ip0 = m_nodes.Get (0)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip0, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4RoutingProtocol> routing0 = ip0->GetRoutingProtocol ();
  NS_TEST_ASSERT_MSG_NE (routing0, 0, "Error-- no Ipv4 routing protocol object");  
  Ptr<Ipv4GlobalRouting> globalRouting0 = routing0->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting0, 0, "Error-- no Ipv4GlobalRouting object");  

  Ptr<Ipv4L3Protocol> ip1 = m_nodes.Get (1)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip1, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4RoutingProtocol> routing1 = ip1->GetRoutingProtocol ();
  NS_TEST_ASSERT_MSG_NE (routing1, 0, "Error-- no Ipv4 routing protocol object");  
  Ptr<Ipv4GlobalRouting> globalRouting1 = routing1->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting1, 0, "Error-- no Ipv4GlobalRouting object");  

  // Skip to n4
  Ptr<Ipv4L3Protocol> ip4 = m_nodes.Get (4)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip4, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4RoutingProtocol> routing4 = ip4->GetRoutingProtocol ();
  NS_TEST_ASSERT_MSG_NE (routing4, 0, "Error-- no Ipv4 routing protocol object");  
  Ptr<Ipv4GlobalRouting> globalRouting4 = routing4->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting4, 0, "Error-- no Ipv4GlobalRouting object");  

  Ipv4RoutingTableEntry* route = 0;
  // n0
  // Test that the right number of routes found
  uint32_t nRoutes0 = globalRouting0->GetNRoutes ();
  NS_LOG_DEBUG ("BridgeTest nRoutes0 " << nRoutes0);
  NS_TEST_ASSERT_MSG_EQ (nRoutes0, 3, "Error-- not three entries");
  for (uint32_t i = 0; i < globalRouting0->GetNRoutes (); i++)
    {
      route = globalRouting0->GetRoute (i);
      NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
    }
  // Spot check the last route
  if (route)
    {
      NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.3.0"), "Error-- wrong destination");
      NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.1.2"), "Error-- wrong gateway");
    }

  // n1
  // Test that the right number of routes found
  route = 0;
  uint32_t nRoutes1 = globalRouting1->GetNRoutes ();
  NS_LOG_DEBUG ("BridgeTest nRoutes1 " << nRoutes1);
  NS_TEST_ASSERT_MSG_EQ (nRoutes1, 3, "Error-- not three entries");
  for (uint32_t i = 0; i < globalRouting1->GetNRoutes (); i++)
    {
      route = globalRouting1->GetRoute (i);
      NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
    }
  // Spot check the last route
  if (route)
    {
      NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.3.0"), "Error-- wrong destination");
      NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.2.2"), "Error-- wrong gateway");
    }

  // skip n2 and n3, just verify n4
  NS_LOG_DEBUG ("BridgeTest skip print out of n2 and n3, go next to node n4");

  // n4
  route = 0;
  // Test that the right number of routes found
  uint32_t nRoutes4 = globalRouting4->GetNRoutes ();
  NS_LOG_DEBUG ("BridgeTest nRoutes4 " << nRoutes4);
  NS_TEST_ASSERT_MSG_EQ (nRoutes4, 3, "Error-- not three entries");
  for (uint32_t i = 0; i < globalRouting4->GetNRoutes (); i++)
    {
      route = globalRouting4->GetRoute (i);
      NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
    }
  // Spot check the last route
  if (route)
    {
      NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.1.0"), "Error-- wrong destination");
      NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.3.1"), "Error-- wrong gateway");
    }

  Simulator::Destroy ();
}

class TwoBridgeTest : public TestCase
{
public:
  virtual void DoSetup (void);
  virtual void DoRun (void);
  TwoBridgeTest ();
private:
  NodeContainer m_nodes; 
};

TwoBridgeTest::TwoBridgeTest ()
  : TestCase ("Global routing across two bridges")
{
}

void
TwoBridgeTest::DoSetup ()
{
  m_nodes.Create (5);

  //connect node0 to node1
  Ptr<SimpleChannel> channel = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper;
  NetDeviceContainer net = simpleHelper.Install (m_nodes.Get (0), channel);
  net.Add (simpleHelper.Install (m_nodes.Get (1), channel));

  NetDeviceContainer bridgeFacingDevices;
  NetDeviceContainer switchn2Devices;
  NetDeviceContainer switchn3Devices;

  //connect node1 to node2 (switch)
  Ptr<SimpleChannel> channel2 = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper2;
  NetDeviceContainer net2 = simpleHelper2.Install (m_nodes.Get (1), channel2);
  net2.Add (simpleHelper2.Install (m_nodes.Get (2), channel2));
  bridgeFacingDevices.Add (net2.Get (0));
  switchn2Devices.Add (net2.Get (1));

  //connect node2 (switch) to node3
  Ptr<SimpleChannel> channel3 = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper3;
  NetDeviceContainer net3 = simpleHelper3.Install (m_nodes.Get (2), channel3);
  net3.Add (simpleHelper3.Install (m_nodes.Get (3), channel3));
  switchn2Devices.Add (net3.Get (0));
  switchn3Devices.Add (net3.Get (1));

  //connect node3 to node4
  Ptr<SimpleChannel> channel4 = CreateObject <SimpleChannel> ();
  SimpleNetDeviceHelper simpleHelper4;
  NetDeviceContainer net4 = simpleHelper4.Install (m_nodes.Get (3), channel4);
  net4.Add (simpleHelper4.Install (m_nodes.Get (4), channel4));
  switchn3Devices.Add (net4.Get (0));
  bridgeFacingDevices.Add (net4.Get (1));

  Ptr<Node> switchn2Node = m_nodes.Get (2);
  BridgeHelper bridgen2Helper;
  bridgen2Helper.Install (switchn2Node, switchn2Devices);

  Ptr<Node> switchn3Node = m_nodes.Get (3);
  BridgeHelper bridgen3Helper;
  bridgen3Helper.Install (switchn3Node, switchn3Devices);

  InternetStackHelper internet;
  // By default, InternetStackHelper adds a static and global routing
  // implementation.  We just want the global for this test.
  Ipv4GlobalRoutingHelper ipv4RoutingHelper;
  internet.SetRoutingHelper (ipv4RoutingHelper);

  internet.Install (m_nodes.Get (0));
  internet.Install (m_nodes.Get (1));
  // m_nodes.Get (2) is bridge node
  // m_nodes.Get (3) is bridge node
  internet.Install (m_nodes.Get (4));

  Ipv4AddressHelper address;
  address.SetBase ("10.1.1.0", "255.255.255.0");
  address.Assign (net);

  address.SetBase ("10.1.2.0", "255.255.255.0");
  address.Assign (bridgeFacingDevices);

}

void
TwoBridgeTest::DoRun ()
{
  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  Ptr<Ipv4L3Protocol> ip0 = m_nodes.Get (0)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip0, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4RoutingProtocol> routing0 = ip0->GetRoutingProtocol ();
  NS_TEST_ASSERT_MSG_NE (routing0, 0, "Error-- no Ipv4 routing protocol object");  
  Ptr<Ipv4GlobalRouting> globalRouting0 = routing0->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting0, 0, "Error-- no Ipv4GlobalRouting object");  

  // Skip to n4
  Ptr<Ipv4L3Protocol> ip4 = m_nodes.Get (4)->GetObject<Ipv4L3Protocol> ();
  NS_TEST_ASSERT_MSG_NE (ip4, 0, "Error-- no Ipv4 object");  
  Ptr<Ipv4RoutingProtocol> routing4 = ip4->GetRoutingProtocol ();
  NS_TEST_ASSERT_MSG_NE (routing4, 0, "Error-- no Ipv4 routing protocol object");  
  Ptr<Ipv4GlobalRouting> globalRouting4 = routing4->GetObject <Ipv4GlobalRouting> ();
  NS_TEST_ASSERT_MSG_NE (globalRouting4, 0, "Error-- no Ipv4GlobalRouting object");  

  Ipv4RoutingTableEntry* route = 0;
  // n0
  // Test that the right number of routes found
  uint32_t nRoutes0 = globalRouting0->GetNRoutes ();
  NS_LOG_DEBUG ("BridgeTest nRoutes0 " << nRoutes0);
  NS_TEST_ASSERT_MSG_EQ (nRoutes0, 2, "Error-- not two entries");
  for (uint32_t i = 0; i < globalRouting0->GetNRoutes (); i++)
    {
      route = globalRouting0->GetRoute (i);
      NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
    }
  // Spot check the last route
  if (route)
    {
      NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.2.0"), "Error-- wrong destination");
      NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.1.2"), "Error-- wrong gateway");
    }
  // skip n2 and n3, just verify n4
  NS_LOG_DEBUG ("BridgeTest skip print out of n1-n3, go next to node n4");

  // n4
  // Test that the right number of routes found
  route = 0;
  uint32_t nRoutes4 = globalRouting4->GetNRoutes ();
  NS_LOG_DEBUG ("BridgeTest nRoutes4 " << nRoutes4);
  NS_TEST_ASSERT_MSG_EQ (nRoutes4, 2, "Error-- not two entries");
  for (uint32_t i = 0; i < globalRouting4->GetNRoutes (); i++)
    {
      route = globalRouting4->GetRoute (i);
      NS_LOG_DEBUG ("entry dest " << route->GetDest () << " gw " << route->GetGateway ());
    }
  // Spot check the last route
  if (route)
    {
      NS_TEST_ASSERT_MSG_EQ (route->GetDest (), Ipv4Address ("10.1.1.0"), "Error-- wrong destination");
      NS_TEST_ASSERT_MSG_EQ (route->GetGateway (), Ipv4Address ("10.1.2.1"), "Error-- wrong gateway");
    }

  Simulator::Destroy ();
}

class Ipv4DynamicGlobalRoutingTestCase : public TestCase
{
public:
  Ipv4DynamicGlobalRoutingTestCase ();
  virtual ~Ipv4DynamicGlobalRoutingTestCase ();

private:
  void SendData (uint8_t index);

  void ShutDownSock (uint8_t index);

  void HandleRead (Ptr<Socket> socket);
  virtual void DoRun (void);

  uint16_t m_count; 
  std::vector<std::pair<Ptr<Socket>, bool> > m_sendSocks; 
  DataRate m_dataRate;  
  uint16_t m_packetSize;  
  std::vector<uint8_t> m_firstInterface;  
  std::vector<uint8_t> m_secondInterface;  
};

// Add some help text to this case to describe what it is intended to test
Ipv4DynamicGlobalRoutingTestCase::Ipv4DynamicGlobalRoutingTestCase ()
  : TestCase ("Dynamic global routing example"), m_count (0)
{
  m_firstInterface.resize (16);
  m_secondInterface.resize (16);
  m_dataRate = DataRate ("2kbps");
  m_packetSize = 50;
}

Ipv4DynamicGlobalRoutingTestCase::~Ipv4DynamicGlobalRoutingTestCase ()
{
  std::vector<std::pair<Ptr<Socket>, bool> >::iterator iter;

  for (iter = m_sendSocks.begin (); iter != m_sendSocks.end (); iter++)
    {
      if (iter->second)
        {
          iter->second = false;
          iter->first->Close ();
          iter->first = 0;
        }
    }
}

void 
Ipv4DynamicGlobalRoutingTestCase::HandleRead (Ptr<Socket> socket)
{
  Ptr<Packet> packet;
  Address from;
  while ((packet = socket->RecvFrom (from)))
    {
      if (packet->GetSize () == 0)
        { //EOF
          break;
        }
      Ipv4PacketInfoTag tag;
      bool found;
      found = packet->PeekPacketTag (tag);
      uint8_t now = static_cast<uint8_t> (Simulator::Now ().GetSeconds ());
      if (found)
        {
          if (tag.GetRecvIf () == 1)
            {
              m_firstInterface[now]++;
            }
          if (tag.GetRecvIf () == 2)
            {
              m_secondInterface[now]++;
            }
          m_count++;
        }
    }
}

void
Ipv4DynamicGlobalRoutingTestCase::SendData (uint8_t index)
{
  if (m_sendSocks[index].second == false)
    {
      return;
    }
  Ptr<Packet> packet = Create<Packet> (m_packetSize);
  m_sendSocks[index].first->Send (packet);

  Time tNext (MicroSeconds (m_packetSize * 8 * 1e6 / m_dataRate.GetBitRate ()));
  Simulator::Schedule (tNext, &Ipv4DynamicGlobalRoutingTestCase::SendData, this, index);
}

void
Ipv4DynamicGlobalRoutingTestCase::ShutDownSock (uint8_t index)
{
  m_sendSocks[index].second = false;
  m_sendSocks[index].first->Close ();
  m_sendSocks[index].first = 0;
}

// Test derived from examples/routing/dynamic-global-routing.cc
//
// Network topology
//
//  n0
//     \ p-p
//      \          (shared csma/cd)
//       n2 -------------------------n3
//      /            |        | 
//     / p-p        n4        n5 ---------- n6
//   n1                             p-p
//   |                                      |
//   ----------------------------------------
//                p-p
//
// Test that for node n6, the interface facing n5 receives packets at
// times (1-2), (4-6), (8-10), (11-12), (14-16) and the interface
// facing n1 receives packets at times (2-4), (6-8), (12-13)
//
void
Ipv4DynamicGlobalRoutingTestCase::DoRun (void)
{
  // The below value configures the default behavior of global routing.
  // By default, it is disabled.  To respond to interface events, set to true
  Config::SetDefault ("ns3::Ipv4GlobalRouting::RespondToInterfaceEvents", BooleanValue (true));

  NodeContainer c;
  c.Create (7);
  NodeContainer n0n2 = NodeContainer (c.Get (0), c.Get (2));
  NodeContainer n1n2 = NodeContainer (c.Get (1), c.Get (2));
  NodeContainer n5n6 = NodeContainer (c.Get (5), c.Get (6));
  NodeContainer n1n6 = NodeContainer (c.Get (1), c.Get (6));
  NodeContainer n2345 = NodeContainer (c.Get (2), c.Get (3), c.Get (4), c.Get (5));

  InternetStackHelper internet;
  internet.Install (c);

  // We create the channels first without any IP addressing information
  SimpleNetDeviceHelper devHelper;

  devHelper.SetNetDevicePointToPointMode (true);
  NetDeviceContainer d0d2 = devHelper.Install (n0n2);
  devHelper.SetNetDevicePointToPointMode (false);

  NetDeviceContainer d1d6 = devHelper.Install (n1n6);
  NetDeviceContainer d1d2 = devHelper.Install (n1n2);
  NetDeviceContainer d5d6 = devHelper.Install (n5n6);
  NetDeviceContainer d2345 = devHelper.Install (n2345);

  // Later, we add IP addresses.
  Ipv4AddressHelper ipv4;
  ipv4.SetBase ("10.1.1.0", "255.255.255.0");
  ipv4.Assign (d0d2);

  ipv4.SetBase ("10.1.2.0", "255.255.255.0");
  ipv4.Assign (d1d2);

  ipv4.SetBase ("10.1.3.0", "255.255.255.0");
  Ipv4InterfaceContainer i5i6 = ipv4.Assign (d5d6);

  ipv4.SetBase ("10.250.1.0", "255.255.255.0");
  ipv4.Assign (d2345);

  ipv4.SetBase ("172.16.1.0", "255.255.255.0");
  Ipv4InterfaceContainer i1i6 = ipv4.Assign (d1d6);

  // Create router nodes, initialize routing database and set up the routing
  // tables in the nodes.
  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  // Create the applications to send UDP datagrams of size
  // 50 bytes at a rate of 2 Kb/s
  TypeId tid = TypeId::LookupByName ("ns3::UdpSocketFactory");
  uint16_t port = 9;   // Discard port (RFC 863)

  std::pair<Ptr<Socket>, bool>  sendSockA;
  sendSockA.first = Socket::CreateSocket (c.Get (1), tid);
  sendSockA.first->Bind ();
  sendSockA.first->Connect (InetSocketAddress (i5i6.GetAddress (1), port));
  sendSockA.second = true;
  m_sendSocks.push_back (sendSockA);
  Simulator::Schedule (Seconds (1.0), &Ipv4DynamicGlobalRoutingTestCase::SendData, this, 0);
  Simulator::Schedule (Seconds (10.0), &Ipv4DynamicGlobalRoutingTestCase::ShutDownSock, this, 0);

  std::pair<Ptr<Socket>, bool>  sendSockB;
  sendSockB.first = Socket::CreateSocket (c.Get (1), tid);
  sendSockB.first->Bind ();
  sendSockB.first->Connect (InetSocketAddress (i1i6.GetAddress (1), port));
  sendSockB.second = true;
  m_sendSocks.push_back (sendSockB);
  Simulator::Schedule (Seconds (11.0), &Ipv4DynamicGlobalRoutingTestCase::SendData, this, 1);
  Simulator::Schedule (Seconds (16.0), &Ipv4DynamicGlobalRoutingTestCase::ShutDownSock, this, 1);


  // Create an optional packet sink to receive these packets
  Ptr<Socket> sink2 = Socket::CreateSocket (c.Get (6), tid);
  sink2->Bind (Address (InetSocketAddress (Ipv4Address::GetAny (), port)));
  sink2->Listen ();
  sink2->ShutdownSend ();

  sink2->SetRecvPktInfo (true);
  sink2->SetRecvCallback (MakeCallback (&Ipv4DynamicGlobalRoutingTestCase::HandleRead, this));

  Ptr<Node> n1 = c.Get (1);
  Ptr<Ipv4> ipv41 = n1->GetObject<Ipv4> ();
  // The first ifIndex is 0 for loopback, then the first p2p is numbered 1,
  // then the next p2p is numbered 2
  uint32_t ipv4ifIndex1 = 2;

  Simulator::Schedule (Seconds (2), &Ipv4::SetDown,ipv41, ipv4ifIndex1);
  Simulator::Schedule (Seconds (4), &Ipv4::SetUp,ipv41, ipv4ifIndex1);

  Ptr<Node> n6 = c.Get (6);
  Ptr<Ipv4> ipv46 = n6->GetObject<Ipv4> ();
  // The first ifIndex is 0 for loopback, then the first p2p is numbered 1,
  // then the next p2p is numbered 2
  uint32_t ipv4ifIndex6 = 2;
  Simulator::Schedule (Seconds (6), &Ipv4::SetDown,ipv46, ipv4ifIndex6);
  Simulator::Schedule (Seconds (8), &Ipv4::SetUp,ipv46, ipv4ifIndex6);

  Simulator::Schedule (Seconds (12), &Ipv4::SetDown,ipv41, ipv4ifIndex1);
  Simulator::Schedule (Seconds (14), &Ipv4::SetUp,ipv41, ipv4ifIndex1);

  Simulator::Run ();

  NS_TEST_ASSERT_MSG_EQ (m_count, 70, "Dynamic global routing did not deliver all packets");
// Test that for node n6, the interface facing n5 receives packets at
// times (1-2), (4-6), (8-10), (11-12), (14-16) and the interface
// facing n1 receives packets at times (2-4), (6-8), (12-13)
  NS_TEST_ASSERT_MSG_EQ (m_firstInterface[1], 5, "Dynamic global routing did not deliver all packets " << int(m_firstInterface[1]));
  NS_TEST_ASSERT_MSG_EQ (m_secondInterface[2], 5, "Dynamic global routing did not deliver all packets " << int(m_secondInterface[2]));
  NS_TEST_ASSERT_MSG_EQ (m_secondInterface[3], 5, "Dynamic global routing did not deliver all packets " << int(m_secondInterface[3]));
  NS_TEST_ASSERT_MSG_EQ (m_firstInterface[4], 5, "Dynamic global routing did not deliver all packets " << int(m_firstInterface[4]));
  NS_TEST_ASSERT_MSG_EQ (m_firstInterface[5], 5, "Dynamic global routing did not deliver all packets " << int(m_firstInterface[5]));
  NS_TEST_ASSERT_MSG_EQ (m_secondInterface[6], 5, "Dynamic global routing did not deliver all packets " << int(m_secondInterface[6]));
  NS_TEST_ASSERT_MSG_EQ (m_secondInterface[7], 5, "Dynamic global routing did not deliver all packets " << int(m_secondInterface[7]));
  NS_TEST_ASSERT_MSG_EQ (m_firstInterface[8], 5, "Dynamic global routing did not deliver all packets " << int(m_firstInterface[8]));
  NS_TEST_ASSERT_MSG_EQ (m_firstInterface[9], 5, "Dynamic global routing did not deliver all packets " << int(m_firstInterface[9]));
  NS_TEST_ASSERT_MSG_EQ (m_firstInterface[10], 0, "Dynamic global routing did not deliver all packets " << int(m_firstInterface[10]));
  NS_TEST_ASSERT_MSG_EQ (m_firstInterface[11], 5, "Dynamic global routing did not deliver all packets " << int(m_firstInterface[11]));
  NS_TEST_ASSERT_MSG_EQ (m_secondInterface[12], 5, "Dynamic global routing did not deliver all packets " << int(m_secondInterface[12]));
  NS_TEST_ASSERT_MSG_EQ (m_secondInterface[13], 5, "Dynamic global routing did not deliver all packets " << int(m_secondInterface[13]));
  NS_TEST_ASSERT_MSG_EQ (m_firstInterface[14], 5, "Dynamic global routing did not deliver all packets " << int(m_firstInterface[14]));
  NS_TEST_ASSERT_MSG_EQ (m_firstInterface[15], 5, "Dynamic global routing did not deliver all packets " << int(m_firstInterface[15]));
  Simulator::Destroy ();
}

class Ipv4GlobalRoutingSlash32TestCase : public TestCase
{
public:
  Ipv4GlobalRoutingSlash32TestCase ();
  virtual ~Ipv4GlobalRoutingSlash32TestCase ();

  Ptr<Packet> m_receivedPacket; 

  void ReceivePkt (Ptr<Socket> socket);
  void DoSendData (Ptr<Socket> socket, std::string to);
  void SendData (Ptr<Socket> socket, std::string to);

private:
  virtual void DoRun (void);
};

// Add some help text to this case to describe what it is intended to test
Ipv4GlobalRoutingSlash32TestCase::Ipv4GlobalRoutingSlash32TestCase ()
  : TestCase ("Slash 32 global routing example")
{
}

Ipv4GlobalRoutingSlash32TestCase::~Ipv4GlobalRoutingSlash32TestCase ()
{
}

void
Ipv4GlobalRoutingSlash32TestCase::ReceivePkt (Ptr<Socket> socket)
{
  uint32_t availableData;
  availableData = socket->GetRxAvailable ();
  m_receivedPacket = socket->Recv (std::numeric_limits<uint32_t>::max (), 0);
  NS_ASSERT (availableData == m_receivedPacket->GetSize ());
  //cast availableData to void, to suppress 'availableData' set but not used
  //compiler warning
  (void) availableData;
}

void
Ipv4GlobalRoutingSlash32TestCase::DoSendData (Ptr<Socket> socket, std::string to)
{
  Address realTo = InetSocketAddress (Ipv4Address (to.c_str ()), 1234);
  NS_TEST_EXPECT_MSG_EQ (socket->SendTo (Create<Packet> (123), 0, realTo),
                         123, "100");
}

void
Ipv4GlobalRoutingSlash32TestCase::SendData (Ptr<Socket> socket, std::string to)
{
  m_receivedPacket = Create<Packet> ();
  Simulator::ScheduleWithContext (socket->GetNode ()->GetId (), Seconds (60),
                                  &Ipv4GlobalRoutingSlash32TestCase::DoSendData, this, socket, to);
  Simulator::Stop (Seconds (66));
  Simulator::Run ();
}

// Test program for this 3-router scenario, using global routing
//
// (a.a.a.a/32)A<--x.x.x.0/30-->B<--y.y.y.0/30-->C(c.c.c.c/32)
//
void
Ipv4GlobalRoutingSlash32TestCase::DoRun (void)
{
  Ptr<Node> nA = CreateObject<Node> ();
  Ptr<Node> nB = CreateObject<Node> ();
  Ptr<Node> nC = CreateObject<Node> ();

  NodeContainer c = NodeContainer (nA, nB, nC);

  InternetStackHelper internet;
  internet.Install (c);

  // simple links
  NodeContainer nAnB = NodeContainer (nA, nB);
  NodeContainer nBnC = NodeContainer (nB, nC);

  SimpleNetDeviceHelper devHelper;

  Ptr<SimpleNetDevice> deviceA = CreateObject<SimpleNetDevice> ();
  deviceA->SetAddress (Mac48Address::Allocate ());
  nA->AddDevice (deviceA);

  NetDeviceContainer dAdB = devHelper.Install (nAnB);
  NetDeviceContainer dBdC = devHelper.Install (nBnC);

  Ptr<SimpleNetDevice> deviceC = CreateObject<SimpleNetDevice> ();
  deviceC->SetAddress (Mac48Address::Allocate ());
  nC->AddDevice (deviceC);

  // Later, we add IP addresses.
  Ipv4AddressHelper ipv4;
  ipv4.SetBase ("10.1.1.0", "255.255.255.252");
  Ipv4InterfaceContainer iAiB = ipv4.Assign (dAdB);

  ipv4.SetBase ("10.1.1.4", "255.255.255.252");
  Ipv4InterfaceContainer iBiC = ipv4.Assign (dBdC);

  Ptr<Ipv4> ipv4A = nA->GetObject<Ipv4> ();
  Ptr<Ipv4> ipv4B = nB->GetObject<Ipv4> ();
  Ptr<Ipv4> ipv4C = nC->GetObject<Ipv4> ();

  int32_t ifIndexA = ipv4A->AddInterface (deviceA);
  int32_t ifIndexC = ipv4C->AddInterface (deviceC);

  Ipv4InterfaceAddress ifInAddrA = Ipv4InterfaceAddress (Ipv4Address ("172.16.1.1"), Ipv4Mask ("/32"));
  ipv4A->AddAddress (ifIndexA, ifInAddrA);
  ipv4A->SetMetric (ifIndexA, 1);
  ipv4A->SetUp (ifIndexA);

  Ipv4InterfaceAddress ifInAddrC = Ipv4InterfaceAddress (Ipv4Address ("192.168.1.1"), Ipv4Mask ("/32"));
  ipv4C->AddAddress (ifIndexC, ifInAddrC);
  ipv4C->SetMetric (ifIndexC, 1);
  ipv4C->SetUp (ifIndexC);

  // Create router nodes, initialize routing database and set up the routing
  // tables in the nodes.
  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  // Create the UDP sockets
  Ptr<SocketFactory> rxSocketFactory = nC->GetObject<UdpSocketFactory> ();
  Ptr<Socket> rxSocket = rxSocketFactory->CreateSocket ();
  NS_TEST_EXPECT_MSG_EQ (rxSocket->Bind (InetSocketAddress (Ipv4Address ("192.168.1.1"), 1234)), 0, "trivial");
  rxSocket->SetRecvCallback (MakeCallback (&Ipv4GlobalRoutingSlash32TestCase::ReceivePkt, this));

  Ptr<SocketFactory> txSocketFactory = nA->GetObject<UdpSocketFactory> ();
  Ptr<Socket> txSocket = txSocketFactory->CreateSocket ();
  txSocket->SetAllowBroadcast (true);

  // ------ Now the tests ------------

  // Unicast test
  SendData (txSocket, "192.168.1.1");
  NS_TEST_EXPECT_MSG_EQ (m_receivedPacket->GetSize (), 123, "Static routing with /32 did not deliver all packets.");

  Simulator::Destroy ();
}

class Ipv4GlobalRoutingTestSuite : public TestSuite
{
public:
  Ipv4GlobalRoutingTestSuite ();
};

Ipv4GlobalRoutingTestSuite::Ipv4GlobalRoutingTestSuite ()
  : TestSuite ("ipv4-global-routing", UNIT)
  {
    AddTestCase (new LinkTest, TestCase::QUICK);
    AddTestCase (new LanTest, TestCase::QUICK);
    AddTestCase (new TwoLinkTest, TestCase::QUICK);
    AddTestCase (new TwoLanTest, TestCase::QUICK);
    AddTestCase (new BridgeTest, TestCase::QUICK);
    AddTestCase (new TwoBridgeTest, TestCase::QUICK);
    AddTestCase (new Ipv4DynamicGlobalRoutingTestCase, TestCase::QUICK);
    AddTestCase (new Ipv4GlobalRoutingSlash32TestCase, TestCase::QUICK);
  }

static Ipv4GlobalRoutingTestSuite g_globalRoutingTestSuite;