NS3仿真软件与外部通信(code.cc)

【实例截图】

【核心代码】

//tap-wifi-dumbbell本身可以在linux内部互通，但是如果与外部真实主机互通，

//有三种方案：其中一种方案需要路由的支持。

//拓扑图如下



//配置命令如下：

ip tuntap add dev tap0 mod tap
ifconfig tap0 10.1.1.1 up
ping 10.1.1.1
#linux设置主机路由，其中NS3中除了影子节点以外，任何一个都可以设置为网关，gw不能设置为10.1.1.1,该地址是一个桥设备
route add -net 10.1.1.0  netmask 255.255.255.0 dev tap0
route add -net 10.1.2.0  netmask 255.255.255.0 dev tap0 gw 10.1.1.2
route add -net 10.1.3.0  netmask 255.255.255.0 dev tap0 gw 10.1.1.2


#windows 主机路由
route add 10.1.1.0 mask 255.255.255.0 192.168.198.129
route add 10.1.2.0 mask 255.255.255.0 192.168.198.129


//更改原来的代码，并添加上一段简单的静态路由：

// Network topology
//
//  ----------
//  | external |
//  |  Linux   |
//  |   Host   |
//  |          |
//  | "mytap"  |
//  ----------
//       |           n0                n3                n4
//       |        --------       ------------       ------------
//        -------|  tap   |     |            |     |            |
//               | bridge | ... |            |     |            |
//                --------       ------------       ------------
//               |  Wifi  |     | Wifi | P2P |-----| P2P | CSMA |
//                --------       ------ -----       ----- ------
//                   |              |           ^           |
//                 ((*))          ((*))         |           |
//                                          P2P 10.1.2      |
//                 ((*))          ((*))                     |    n5  n6   n7
//                   |              |                       |     |   |    |
//                  n1             n2                       ================
//                     Wifi 10.1.1                           CSMA LAN 10.1.3
//
// The Wifi device on node zero is:  10.1.1.1
// The Wifi device on node one is:   10.1.1.2
// The Wifi device on node two is:   10.1.1.3
// The Wifi device on node three is: 10.1.1.4
// The P2P device on node three is:  10.1.2.1
// The P2P device on node four is:   10.1.2.2
// The CSMA device on node four is:  10.1.3.1
// The CSMA device on node five is:  10.1.3.2
// The CSMA device on node six is:   10.1.3.3
// The CSMA device on node seven is: 10.1.3.4
//
// Some simple things to do:
//
// 1) Ping one of the simulated nodes on the left side of the topology.
//
//    ./waf --run tap-wifi-dumbbell&
//    ping 10.1.1.3
//
// 2) Configure a route in the linux host and ping once of the nodes on the 
//    right, across the point-to-point link.  You will see relatively large
//    delays due to CBR background traffic on the point-to-point (see next
//    item).
//
//    ./waf --run tap-wifi-dumbbell&
//    sudo route add -net 10.1.3.0 netmask 255.255.255.0 dev thetap gw 10.1.1.2
//    ping 10.1.3.4
//
//    Take a look at the pcap traces and note that the timing reflects the 
//    addition of the significant delay and low bandwidth configured on the 
//    point-to-point link along with the high traffic.
//
// 3) Fiddle with the background CBR traffic across the point-to-point 
//    link and watch the ping timing change.  The OnOffApplication "DataRate"
//    attribute defaults to 500kb/s and the "PacketSize" Attribute defaults
//    to 512.  The point-to-point "DataRate" is set to 512kb/s in the script,
//    so in the default case, the link is pretty full.  This should be 
//    reflected in large delays seen by ping.  You can crank down the CBR 
//    traffic data rate and watch the ping timing change dramatically.
//
//    ./waf --run "tap-wifi-dumbbell --ns3::OnOffApplication::DataRate=100kb/s"&
//    sudo route add -net 10.1.3.0 netmask 255.255.255.0 dev thetap gw 10.1.1.2
//    ping 10.1.3.4
//
// 4) Try to run this in UseBridge mode.  This allows you to bridge an ns-3
//    simulation to an existing pre-configured bridge.  This uses tap devices
//    just for illustration, you can create your own bridge if you want.
//
//    sudo tunctl -t mytap1
//    sudo ifconfig mytap1 0.0.0.0 promisc up
//    sudo tunctl -t mytap2
//    sudo ifconfig mytap2 0.0.0.0 promisc up
//    sudo brctl addbr mybridge
//    sudo brctl addif mybridge mytap1
//    sudo brctl addif mybridge mytap2
//    sudo ifconfig mybridge 10.1.1.5 netmask 255.255.255.0 up
//    ./waf --run "tap-wifi-dumbbell --mode=UseBridge --tapName=mytap2"&
//    ping 10.1.1.3

#include <iostream>
#include <fstream>

#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/mobility-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/wifi-module.h"
#include "ns3/internet-module.h"
#include "ns3/csma-module.h"
#include "ns3/applications-module.h"
#include "ns3/ipv4-global-routing-helper.h"
#include "ns3/tap-bridge-module.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("TapDumbbellExample");

int 
main (int argc, char *argv[])
{
  //std::string mode = "ConfigureLocal";
  //std::string tapName = "thetap";

  //std::string mode = "UseBridge";
  std::string mode = "UseLocal";
  std::string tapName = "tap0";

  CommandLine cmd;
  cmd.AddValue ("mode", "Mode setting of TapBridge", mode);
  cmd.AddValue ("tapName", "Name of the OS tap device", tapName);
  cmd.Parse (argc, argv);

  GlobalValue::Bind ("SimulatorImplementationType", StringValue ("ns3::RealtimeSimulatorImpl"));
  GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true));

  //
  // The topology has a Wifi network of four nodes on the left side.  We'll make
  // node zero the AP and have the other three will be the STAs.
  //
  NodeContainer nodesLeft;
  nodesLeft.Create (4);


  YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();
  YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default ();
  wifiPhy.SetChannel (wifiChannel.Create ());

  Ssid ssid = Ssid ("left");
  WifiHelper wifi;
  WifiMacHelper wifiMac;
  wifi.SetRemoteStationManager ("ns3::ArfWifiManager");

  wifiMac.SetType ("ns3::ApWifiMac",
                   "Ssid", SsidValue (ssid));
  NetDeviceContainer devicesLeft = wifi.Install (wifiPhy, wifiMac, nodesLeft.Get (0));


  wifiMac.SetType ("ns3::StaWifiMac",
                   "Ssid", SsidValue (ssid),
                   "ActiveProbing", BooleanValue (false));
  devicesLeft.Add (wifi.Install (wifiPhy, wifiMac, NodeContainer (nodesLeft.Get (1), nodesLeft.Get (2), nodesLeft.Get (3))));

  MobilityHelper mobility;
  mobility.Install (nodesLeft);

// 添加一下自己的路由控制
    Ipv4GlobalRoutingHelper globalRouting;
    Ipv4StaticRoutingHelper staticRouting;
 
    Ipv4ListRoutingHelper list;
    list.Add (staticRouting, 20);//设置路由优先级,优先使用静态路由协议
    list.Add (globalRouting, 10);
 
    InternetStackHelper stack1;
    stack1.SetRoutingHelper(list);//设置stack1的路由协议，然后应用于node1和node2
  //InternetStackHelper internetLeft;
  //internetLeft.Install (nodesLeft);
   stack1.Install (nodesLeft);

  Ipv4AddressHelper ipv4Left;
  ipv4Left.SetBase ("10.1.1.0", "255.255.255.0");
  Ipv4InterfaceContainer interfacesLeft = ipv4Left.Assign (devicesLeft);

  Ipv4Address tapAddr = interfacesLeft.GetAddress (1);
  //tapAddr.Print(std::out);
  TapBridgeHelper tapBridge (tapAddr);

  tapBridge.SetAttribute ("Mode", StringValue (mode));
  tapBridge.SetAttribute ("DeviceName", StringValue (tapName));
  tapBridge.Install (nodesLeft.Get (0), devicesLeft.Get (0));

/////////////////////////////////////////////////
      Ptr<Node>  node1 = nodesLeft.Get(1);
      Ptr<Ipv4> ipv4A = node1->GetObject<Ipv4> ();
      Ptr<Ipv4StaticRouting> staticRoutingA = staticRouting.GetStaticRouting (ipv4A);
  // The ifIndex 是 1; the first p2p link added
  // 到C的接入网段地址，需要发送到P2P的AB网间网的B口！！
    staticRoutingA->AddHostRouteTo (Ipv4Address ("192.168.198.1"), Ipv4Address ("10.1.1.1"), 1);
   // 
  //////////////////////////////////////////////////
  // Now, create the right side.
  //
  NodeContainer nodesRight;
  nodesRight.Create (4);

  CsmaHelper csmaRight;
  csmaRight.SetChannelAttribute ("DataRate", DataRateValue (5000000));
  csmaRight.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));

  NetDeviceContainer devicesRight = csmaRight.Install (nodesRight);

  InternetStackHelper internetRight;
  internetRight.Install (nodesRight);

  Ipv4AddressHelper ipv4Right;
  ipv4Right.SetBase ("10.1.3.0", "255.255.255.0");
  Ipv4InterfaceContainer interfacesRight = ipv4Right.Assign (devicesRight);

  //
  // Stick in the point-to-point line between the sides.
  //
  PointToPointHelper p2p;
  p2p.SetDeviceAttribute ("DataRate", StringValue ("512kbps"));
  p2p.SetChannelAttribute ("Delay", StringValue ("10ms"));

  NodeContainer nodes = NodeContainer (nodesLeft.Get (3), nodesRight.Get (0));
  NetDeviceContainer devices = p2p.Install (nodes);

  Ipv4AddressHelper ipv4;
  ipv4.SetBase ("10.1.2.0", "255.255.255.192");
  Ipv4InterfaceContainer interfaces = ipv4.Assign (devices);

  //
  // Simulate some CBR traffic over the point-to-point link
  //
  uint16_t port = 9;   // Discard port (RFC 863)
  OnOffHelper onoff ("ns3::UdpSocketFactory", InetSocketAddress (interfaces.GetAddress (1), port));
  onoff.SetConstantRate (DataRate ("500kb/s"));

  ApplicationContainer apps = onoff.Install (nodesLeft.Get (3));
  apps.Start (Seconds (1.0));

  // Create a packet sink to receive these packets
  PacketSinkHelper sink ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), port));

  apps = sink.Install (nodesRight.Get (0));
  apps.Start (Seconds (1.0));

  wifiPhy.EnablePcapAll ("tap-wifi-dumbbell");

  csmaRight.EnablePcapAll ("tap-wifi-dumbbell-csma", false);
  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  Simulator::Stop (Seconds (300.));
  Simulator::Run ();
  Simulator::Destroy ();
}