nms-p2p-nix.cc

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2009, GTech Systems, Inc.
 * Copyright (c) 2021 NITK Surathkal: Extended to handle IPv6
 *
 * 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
 *
 * Author: Alfred Park <park@gtech-systems.com>
 * Modified By: Josh Pelkey <jpelkey@gatech.edu> (ported to ns-3)
 * Modified By: Ameya Deshpande <ameyanrd@outlook.com> (IPv6 extensions)
 *              Tommaso Pecorella <tommaso.pecorella@unifi.it> (IPv6 extensions)
 */
/*
 * DARPA NMS Campus Network Model
 *
 * This topology replicates the original NMS Campus Network model
 * with the exception of chord links (which were never utilized in the
 * original model)
 * Link Bandwidths and Delays may not be the same as the original
 * specifications
 *
 * The fundamental unit of the NMS model consists of a campus network. The
 * campus network topology can been seen in the model manual.
 *
 * The number of hosts (default 42) is variable.  Finally, an arbitrary
 * number of these campus networks can be connected together (default 2)
 * to make very large simulations.
 */
 
// for timing functions
#include <cstdlib>
#include <sys/time.h>
#include <fstream>
 
#include "ns3/core-module.h"
#include "ns3/internet-module.h"
#include "ns3/network-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/applications-module.h"
#include "ns3/onoff-application.h"
#include "ns3/packet-sink.h"
#include "ns3/simulator.h"
#include "ns3/nix-vector-helper.h"
 
using namespace ns3;
 
typedef struct timeval TIMER_TYPE;
#define TIMER_NOW(_t) gettimeofday (&_t,NULL);
#define TIMER_SECONDS(_t) ((double)(_t).tv_sec + (_t).tv_usec*1e-6)
#define TIMER_DIFF(_t1, _t2) (TIMER_SECONDS (_t1)-TIMER_SECONDS (_t2))
 
NS_LOG_COMPONENT_DEFINE ("CampusNetworkModel");
 
void Progress ()
{
  Simulator::Schedule (Seconds (0.1), Progress);
}
 
template <typename T>
class Array2D
{
public:
  Array2D (const size_t x, const size_t y) :
    p (new T*[x]), m_xMax (x)
  {
    for (size_t i = 0; i < m_xMax; i++)
      p[i] = new T[y];
  }
 
  ~Array2D (void)
  {
    for (size_t i = 0; i < m_xMax; i++)
      delete[] p[i];
    delete[] p;
    p = 0;
  }
 
  T* operator[] (const size_t i)
  {
    return p[i];
  }
private:
  T** p;  
  const size_t m_xMax;  
};
 
template <typename T>
class Array3D
{
public:
  Array3D (const size_t x, const size_t y, const size_t z) : p (new Array2D<T>*[x]), m_xMax (x)
  {
    for (size_t i = 0; i < m_xMax; i++)
      p[i] = new Array2D<T> (y, z);
  }
 
  ~Array3D (void)
  {
    for (size_t i = 0; i < m_xMax; i++)
      {
        delete p[i];
        p[i] = 0;
      }
    delete[] p;
    p = 0;
  }
 
  Array2D<T>& operator[] (const size_t i)
  {
    return *(p[i]);
  }
private:
  Array2D<T>** p;  
  const size_t m_xMax;  
};
 
int
main (int argc, char *argv[])
{
  TIMER_TYPE t0, t1, t2;
  TIMER_NOW (t0);
  std::cout << " ==== DARPA NMS CAMPUS NETWORK SIMULATION ====" << std::endl;
  // LogComponentEnable ("OnOffApplication", LOG_LEVEL_INFO);
 
  int nCN = 2, nLANClients = 42;
  bool nix = true;
  bool useIpv6 = false;
 
  CommandLine cmd (__FILE__);
  cmd.AddValue ("useIPv6", "Use IPv6 instead of IPv4", useIpv6);
  cmd.AddValue ("CN", "Number of total CNs [2]", nCN);
  cmd.AddValue ("LAN", "Number of nodes per LAN [42]", nLANClients);
  cmd.AddValue ("NIX", "Toggle nix-vector routing", nix);
  cmd.Parse (argc,argv);
 
  if (useIpv6 && !nix)
    {
      std::cout << "This script can work in IPv6 only by using NIX"
           << std::endl;
      return 1;
    }
  if (nCN < 2) 
    {
      std::cout << "Number of total CNs (" << nCN << ") lower than minimum of 2"
           << std::endl;
      return 1;
    }
 
  std::cout << "Number of CNs: " << nCN << ", LAN nodes: " << nLANClients << std::endl;
 
  Array2D<NodeContainer> nodes_net0(nCN, 3);
  Array2D<NodeContainer> nodes_net1(nCN, 6);
  NodeContainer* nodes_netLR = new NodeContainer[nCN];
  Array2D<NodeContainer> nodes_net2(nCN, 14);
  Array3D<NodeContainer> nodes_net2LAN(nCN, 7, nLANClients);
  Array2D<NodeContainer> nodes_net3(nCN, 9);
  Array3D<NodeContainer> nodes_net3LAN(nCN, 5, nLANClients);
 
  PointToPointHelper p2p_2gb200ms, p2p_1gb5ms, p2p_100mb1ms;
  InternetStackHelper stack;
  Array3D<Address> ifs2LanRemoteAddress(nCN, 7, nLANClients);
  Array3D<Address> ifs3LanRemoteAddress(nCN, 5, nLANClients);
 
  Ipv4AddressHelper addressHelperv4;
  Ipv6AddressHelper addressHelperv6;
  std::ostringstream oss;
  p2p_1gb5ms.SetDeviceAttribute ("DataRate", StringValue ("1Gbps"));
  p2p_1gb5ms.SetChannelAttribute ("Delay", StringValue ("5ms"));
  p2p_2gb200ms.SetDeviceAttribute ("DataRate", StringValue ("2Gbps"));
  p2p_2gb200ms.SetChannelAttribute ("Delay", StringValue ("200ms"));
  p2p_100mb1ms.SetDeviceAttribute ("DataRate", StringValue ("100Mbps"));
  p2p_100mb1ms.SetChannelAttribute ("Delay", StringValue ("1ms"));
 
  // Setup NixVector Routing
  if (nix)
    {
      if (!useIpv6)
        {
          Ipv4NixVectorHelper nixRouting;
          stack.SetRoutingHelper (nixRouting); // has effect on the next Install ()
        }
      else
        {
          Ipv6NixVectorHelper nixRouting;
          stack.SetRoutingHelper (nixRouting); // has effect on the next Install ()
        }
    }
 
  // Create Campus Networks
  for (int z = 0; z < nCN; ++z) 
    {
      std::cout << "Creating Campus Network " << z << ":" << std::endl;
      // Create Net0
      std::cout << "  SubNet [ 0";
      for (int i = 0; i < 3; ++i) 
        {
          nodes_net0[z][i].Create (1);
          stack.Install (nodes_net0[z][i]);
        }
      nodes_net0[z][0].Add (nodes_net0[z][1].Get (0));
      nodes_net0[z][1].Add (nodes_net0[z][2].Get (0));
      nodes_net0[z][2].Add (nodes_net0[z][0].Get (0));
      NetDeviceContainer ndc0[3];
      for (int i = 0; i < 3; ++i) 
        {
          ndc0[i] = p2p_1gb5ms.Install (nodes_net0[z][i]);
        }
      // Create Net1
      std::cout << " 1";
      for (int i = 0; i < 6; ++i) 
        {
          nodes_net1[z][i].Create (1);
          stack.Install (nodes_net1[z][i]);
        }
      nodes_net1[z][0].Add (nodes_net1[z][1].Get (0));
      nodes_net1[z][2].Add (nodes_net1[z][0].Get (0));
      nodes_net1[z][3].Add (nodes_net1[z][0].Get (0));
      nodes_net1[z][4].Add (nodes_net1[z][1].Get (0));
      nodes_net1[z][5].Add (nodes_net1[z][1].Get (0));
      NetDeviceContainer ndc1[6];
      for (int i = 0; i < 6; ++i) 
        {
          if (i == 1)
            {
              continue;
            }
          ndc1[i] = p2p_1gb5ms.Install (nodes_net1[z][i]);
        }
      // Connect Net0 <-> Net1
      NodeContainer net0_1;
      net0_1.Add (nodes_net0[z][2].Get (0));
      net0_1.Add (nodes_net1[z][0].Get (0));
      NetDeviceContainer ndc0_1;
      ndc0_1 = p2p_1gb5ms.Install (net0_1);
      oss.str ("");
      if (!useIpv6)
        {
          oss << 10 + z << ".1.252.0";
          addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
          addressHelperv4.Assign (ndc0_1);
        }
      else
        {
          oss << 2001 + z << ":1:252::";
          addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
          addressHelperv6.Assign (ndc0_1);
        }
      // Create Net2
      std::cout << " 2";
      for (int i = 0; i < 14; ++i) 
        {
          nodes_net2[z][i].Create (1);
          stack.Install (nodes_net2[z][i]);
        }
      nodes_net2[z][0].Add (nodes_net2[z][1].Get (0));
      nodes_net2[z][2].Add (nodes_net2[z][0].Get (0));
      nodes_net2[z][1].Add (nodes_net2[z][3].Get (0));
      nodes_net2[z][3].Add (nodes_net2[z][2].Get (0));
      nodes_net2[z][4].Add (nodes_net2[z][2].Get (0));
      nodes_net2[z][5].Add (nodes_net2[z][3].Get (0));
      nodes_net2[z][6].Add (nodes_net2[z][5].Get (0));
      nodes_net2[z][7].Add (nodes_net2[z][2].Get (0));
      nodes_net2[z][8].Add (nodes_net2[z][3].Get (0));
      nodes_net2[z][9].Add (nodes_net2[z][4].Get (0));
      nodes_net2[z][10].Add (nodes_net2[z][5].Get (0));
      nodes_net2[z][11].Add (nodes_net2[z][6].Get (0));
      nodes_net2[z][12].Add (nodes_net2[z][6].Get (0));
      nodes_net2[z][13].Add (nodes_net2[z][6].Get (0));
      NetDeviceContainer ndc2[14];
      for (int i = 0; i < 14; ++i) 
        {
          ndc2[i] = p2p_1gb5ms.Install (nodes_net2[z][i]);
        }
      Array2D<NetDeviceContainer> ndc2LAN(7, nLANClients);
      for (int i = 0; i < 7; ++i) 
        {
          oss.str ("");
          if (!useIpv6)
            {
              oss << 10 + z << ".4." << 15 + i << ".0";
              addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
            }
          else
            {
              oss << 2001 + z << ":4:" << 15 + i << "::";
              addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
            }
          for (int j = 0; j < nLANClients; ++j) 
            {
              nodes_net2LAN[z][i][j].Create (1);
              stack.Install (nodes_net2LAN[z][i][j]);
              nodes_net2LAN[z][i][j].Add (nodes_net2[z][i+7].Get (0));
              ndc2LAN[i][j] = p2p_100mb1ms.Install (nodes_net2LAN[z][i][j]);
              if (!useIpv6)
                {
                  ifs2LanRemoteAddress[z][i][j] = InetSocketAddress (addressHelperv4.Assign (ndc2LAN[i][j]).GetAddress (0), 9999);
                }
              else
                {
                  ifs2LanRemoteAddress[z][i][j] = Inet6SocketAddress (addressHelperv6.Assign (ndc2LAN[i][j]).GetAddress (0,1), 9999);
                }
            }
        }
      // Create Net3
      std::cout << " 3 ]" << std::endl;
      for (int i = 0; i < 9; ++i) 
        {
          nodes_net3[z][i].Create (1);
          stack.Install (nodes_net3[z][i]);
        }
      nodes_net3[z][0].Add (nodes_net3[z][1].Get (0));
      nodes_net3[z][1].Add (nodes_net3[z][2].Get (0));
      nodes_net3[z][2].Add (nodes_net3[z][3].Get (0));
      nodes_net3[z][3].Add (nodes_net3[z][1].Get (0));
      nodes_net3[z][4].Add (nodes_net3[z][0].Get (0));
      nodes_net3[z][5].Add (nodes_net3[z][0].Get (0));
      nodes_net3[z][6].Add (nodes_net3[z][2].Get (0));
      nodes_net3[z][7].Add (nodes_net3[z][3].Get (0));
      nodes_net3[z][8].Add (nodes_net3[z][3].Get (0));
      NetDeviceContainer ndc3[9];
      for (int i = 0; i < 9; ++i) 
        {
          ndc3[i] = p2p_1gb5ms.Install (nodes_net3[z][i]);
        }
      Array2D<NetDeviceContainer> ndc3LAN(5, nLANClients);
      for (int i = 0; i < 5; ++i) 
        {
          oss.str ("");
          if (!useIpv6)
            {
              oss << 10 + z << ".5." << 10 + i << ".0";
              addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
            }
          else
            {
              oss << 2001 + z << ":5:" << 10 + i << "::";
              addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
 
            }
          for (int j = 0; j < nLANClients; ++j) 
            {
              nodes_net3LAN[z][i][j].Create (1);
              stack.Install (nodes_net3LAN[z][i][j]);
              nodes_net3LAN[z][i][j].Add (nodes_net3[z][i+4].Get (0));
              ndc3LAN[i][j] = p2p_100mb1ms.Install (nodes_net3LAN[z][i][j]);
              if (!useIpv6)
                {
                  ifs3LanRemoteAddress[z][i][j] = InetSocketAddress (addressHelperv4.Assign (ndc3LAN[i][j]).GetAddress (0), 9999);
                }
              else
                {
                  ifs3LanRemoteAddress[z][i][j] = Inet6SocketAddress (addressHelperv6.Assign (ndc3LAN[i][j]).GetAddress (0, 1), 9999);
                }
            }
        }
      std::cout << "  Connecting Subnets..." << std::endl;
      // Create Lone Routers (Node 4 & 5) 
      nodes_netLR[z].Create (2);
      stack.Install (nodes_netLR[z]);
      NetDeviceContainer ndcLR;
      ndcLR = p2p_1gb5ms.Install (nodes_netLR[z]);
      // Connect Net2/Net3 through Lone Routers to Net0
      NodeContainer net0_4, net0_5, net2_4a, net2_4b, net3_5a, net3_5b;
      net0_4.Add (nodes_netLR[z].Get (0));
      net0_4.Add (nodes_net0[z][0].Get (0));
      net0_5.Add (nodes_netLR[z].Get  (1));
      net0_5.Add (nodes_net0[z][1].Get (0));
      net2_4a.Add (nodes_netLR[z].Get (0));
      net2_4a.Add (nodes_net2[z][0].Get (0));
      net2_4b.Add (nodes_netLR[z].Get (1));
      net2_4b.Add (nodes_net2[z][1].Get (0));
      net3_5a.Add (nodes_netLR[z].Get (1));
      net3_5a.Add (nodes_net3[z][0].Get (0));
      net3_5b.Add (nodes_netLR[z].Get (1));
      net3_5b.Add (nodes_net3[z][1].Get (0));
      NetDeviceContainer ndc0_4, ndc0_5, ndc2_4a, ndc2_4b, ndc3_5a, ndc3_5b;
      ndc0_4 = p2p_1gb5ms.Install (net0_4);
      ndc0_5 = p2p_1gb5ms.Install (net0_5);
      ndc2_4a = p2p_1gb5ms.Install (net2_4a);
      ndc2_4b = p2p_1gb5ms.Install (net2_4b);
      ndc3_5a = p2p_1gb5ms.Install (net3_5a);
      ndc3_5b = p2p_1gb5ms.Install (net3_5b);
 
      // Assign IP addresses
 
      if (!useIpv6)
        {
          // ndc0_4
          oss.str ("");
          oss << 10 + z << ".1.253.0";
          addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
          addressHelperv4.Assign (ndc0_4);
          // ndc0_5
          oss.str ("");
          oss << 10 + z << ".1.254.0";
          addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
          addressHelperv4.Assign (ndc0_5);
          // ndc2_4a
          oss.str ("");
          oss << 10 + z << ".4.253.0";
          addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
          addressHelperv4.Assign (ndc2_4a);
          // ndc2_4b
          oss.str ("");
          oss << 10 + z << ".4.254.0";
          addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
          addressHelperv4.Assign (ndc2_4b);
          // ndc3_5a
          oss.str ("");
          oss << 10 + z << ".5.253.0";
          addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
          addressHelperv4.Assign (ndc3_5a);
          // ndc3_5b
          oss.str ("");
          oss << 10 + z << ".5.254.0";
          addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
          addressHelperv4.Assign (ndc3_5b);
        }
      else
        {
          // ndc0_4
          oss.str ("");
          oss << 2001 + z << ":1:253::";
          addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
          addressHelperv6.Assign (ndc0_4);
          // ndc0_5
          oss.str ("");
          oss << 2001 + z << ":1:254::";
          addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
          addressHelperv6.Assign (ndc0_5);
          // ndc2_4a
          oss.str ("");
          oss << 2001 + z << ":4:253::";
          addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
          addressHelperv6.Assign (ndc2_4a);
          // ndc2_4b
          oss.str ("");
          oss << 2001 + z << ":4:254::";
          addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
          addressHelperv6.Assign (ndc2_4b);
          // ndc3_5a
          oss.str ("");
          oss << 2001 + z << ":5:253::";
          addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
          addressHelperv6.Assign (ndc3_5a);
          // ndc3_5b
          oss.str ("");
          oss << 2001 + z << ":5:254::";
          addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
          addressHelperv6.Assign (ndc3_5b);
 
        }
 
      std::cout << "  Assigning IP addresses..." << std::endl;
      for (int i = 0; i < 3; ++i) 
        {
          oss.str ("");
          if (!useIpv6)
            {
              oss << 10 + z << ".1." << 1 + i << ".0";
              addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
              addressHelperv4.Assign (ndc0[i]);
            }
          else
            {
              oss << 2001 + z << ":1:" << 1 + i << "::";
              addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
              addressHelperv6.Assign (ndc0[i]);
            }
        }
      for (int i = 0; i < 6; ++i) 
        {
          if (i == 1) 
            {
              continue;
            }
          oss.str ("");
          if (!useIpv6)
            {
              oss << 10 + z << ".2." << 1 + i << ".0";
              addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
              addressHelperv4.Assign (ndc1[i]);
            }
          else
            {
              oss << 2001 + z << ":2:" << 1 + i << "::";
              addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
              addressHelperv6.Assign (ndc1[i]);
            }
        }
      oss.str ("");
      if (!useIpv6)
        {
          oss << 10 + z << ".3.1.0";
          addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
          addressHelperv4.Assign (ndcLR);
        }
      else
        {
          oss << 2001 + z << ":3:1::";
          addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
          addressHelperv6.Assign (ndcLR);
 
        }
      for (int i = 0; i < 14; ++i) 
        {
          oss.str ("");
          if (!useIpv6)
            {
              oss << 10 + z << ".4." << 1 + i << ".0";
              addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
              addressHelperv4.Assign (ndc2[i]);
            }
          else
            {
              oss << 2001 + z << ":4:" << 1 + i << "::";
              addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
              addressHelperv6.Assign (ndc2[i]);
 
            }
        }
      for (int i = 0; i < 9; ++i) 
        {
          oss.str ("");
          if (!useIpv6)
            {
              oss << 10 + z << ".5." << 1 + i << ".0";
              addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
              addressHelperv4.Assign (ndc3[i]);
            }
          else
            {
              oss << 2001 + z << ":5:" << 1 + i << "::";
              addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
              addressHelperv6.Assign (ndc3[i]);
            }
        }
    }
  // Create Ring Links
  if (nCN > 1) 
    {
      std::cout << "Forming Ring Topology..." << std::endl;
      NodeContainer* nodes_ring = new NodeContainer[nCN];
      for (int z = 0; z < nCN-1; ++z) 
        {
          nodes_ring[z].Add (nodes_net0[z][0].Get (0));
          nodes_ring[z].Add (nodes_net0[z+1][0].Get (0));
        }
      nodes_ring[nCN-1].Add (nodes_net0[nCN-1][0].Get (0));
      nodes_ring[nCN-1].Add (nodes_net0[0][0].Get (0));
      NetDeviceContainer* ndc_ring = new NetDeviceContainer[nCN];
      for (int z = 0; z < nCN; ++z) 
        {
          ndc_ring[z] = p2p_2gb200ms.Install (nodes_ring[z]);
          oss.str ("");
          if (!useIpv6)
            {
              oss << "254.1." << z + 1 << ".0";
              addressHelperv4.SetBase (oss.str ().c_str (), "255.255.255.0");
              addressHelperv4.Assign (ndc_ring[z]);
            }
          else
            {
              oss << "254:1:" << z + 1 << "::";
              addressHelperv6.SetBase (oss.str ().c_str (), Ipv6Prefix (64));
              addressHelperv6.Assign (ndc_ring[z]);
            }
        }
      delete[] ndc_ring;
      delete[] nodes_ring;
    }
 
  // Create Traffic Flows
  std::cout << "Creating TCP Traffic Flows:" << std::endl;
  Config::SetDefault ("ns3::OnOffApplication::MaxBytes", UintegerValue (500000));
  Config::SetDefault ("ns3::OnOffApplication::OnTime",
                      StringValue ("ns3::ConstantRandomVariable[Constant=1.0]"));
  Config::SetDefault ("ns3::OnOffApplication::OffTime",
                      StringValue ("ns3::ConstantRandomVariable[Constant=0.0]"));
  Config::SetDefault ("ns3::TcpSocket::SegmentSize", UintegerValue (512));
 
  Ptr<UniformRandomVariable> urng = CreateObject<UniformRandomVariable> ();
  int r1;
  double r2;
 
  Address sinkAddress;
  if (!useIpv6)
    {
      sinkAddress = InetSocketAddress (Ipv4Address::GetAny (), 9999);
    }
  else
    {
      sinkAddress = Inet6SocketAddress (Ipv6Address::GetAny (), 9999);
    }
 
  for (int z = 0; z < nCN; ++z) 
    {
      int x = z + 1;
      if (z == nCN - 1) 
        {
          x = 0;
        }
      // Subnet 2 LANs
      std::cout << "  Campus Network " << z << " Flows [ Net2 ";
      for (int i = 0; i < 7; ++i) 
        {
          for (int j = 0; j < nLANClients; ++j) 
            {
              // Sinks
              PacketSinkHelper sinkHelper ("ns3::TcpSocketFactory", sinkAddress);
              ApplicationContainer sinkApp = sinkHelper.Install (
                  nodes_net2LAN[z][i][j].Get (0));
              sinkApp.Start (Seconds (0.0));
              // Sources
              r1 = 2 + (int)(4 * urng->GetValue ());
              r2 = 10 * urng->GetValue ();
              OnOffHelper client ("ns3::TcpSocketFactory", Address ());
              AddressValue remoteAddress (ifs2LanRemoteAddress[z][i][j]);
              client.SetAttribute ("Remote", remoteAddress);
              ApplicationContainer clientApp;
              clientApp.Add (client.Install (nodes_net1[x][r1].Get (0)));
              clientApp.Start (Seconds (r2));
            }
        }
      // Subnet 3 LANs
      std::cout << "Net3 ]" << std::endl;
      for (int i = 0; i < 5; ++i) 
        {
          for (int j = 0; j < nLANClients; ++j) 
            {
              // Sinks
              PacketSinkHelper sinkHelper ("ns3::TcpSocketFactory", sinkAddress);
              ApplicationContainer sinkApp = sinkHelper.Install (
                  nodes_net3LAN[z][i][j].Get (0));
              sinkApp.Start (Seconds (0.0));
              // Sources
              r1 = 2 + (int)(4 * urng->GetValue ());
              r2 = 10 * urng->GetValue ();
              OnOffHelper client ("ns3::TcpSocketFactory", Address ());
              AddressValue remoteAddress (ifs3LanRemoteAddress[z][i][j]);
              client.SetAttribute ("Remote", remoteAddress);
              ApplicationContainer clientApp;
              clientApp.Add (client.Install (nodes_net1[x][r1].Get (0)));
              clientApp.Start (Seconds (r2));
            }
        }
    }
 
  std::cout << "Created " << NodeList::GetNNodes () << " nodes." << std::endl;
  TIMER_TYPE routingStart;
  TIMER_NOW (routingStart);
 
  if (nix)
    {
      // Calculate routing tables
      std::cout << "Using Nix-vectors..." << std::endl;
    }
  else
    {
      // Calculate routing tables
      std::cout << "Populating Global Static Routing Tables..." << std::endl;
      Ipv4GlobalRoutingHelper::PopulateRoutingTables ();
    }
 
  TIMER_TYPE routingEnd;
  TIMER_NOW (routingEnd);
  std::cout << "Routing tables population took " 
       << TIMER_DIFF (routingEnd, routingStart) << std::endl;
 
  Simulator::ScheduleNow (Progress);
  std::cout << "Running simulator..." << std::endl;
  TIMER_NOW (t1);
  Simulator::Stop (Seconds (100.0));
  Simulator::Run ();
  TIMER_NOW (t2);
  std::cout << "Simulator finished." << std::endl;
  Simulator::Destroy ();
 
  double d1 = TIMER_DIFF (t1, t0), d2 = TIMER_DIFF (t2, t1);
  std::cout << "-----" << std::endl << "Runtime Stats:" << std::endl;
  std::cout << "Simulator init time: " << d1 << std::endl;
  std::cout << "Simulator run time: " << d2 << std::endl;
  std::cout << "Total elapsed time: " << d1+d2 << std::endl;
 
  delete[] nodes_netLR;
  return 0;
}