NS3的两个例子

/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ //Emacs模式行，GPL boilerplate

#include "ns3/core-module.h"       //
#include "ns3/simulator-module.h"
#include "ns3/node-module.h"
#include "ns3/helper-module.h"

// Default Network Topology
//
//       10.1.1.0
// n0 -------------- n1   n2   n3   n4
//    point-to-point  |    |    |    |
//                    ================
//                      LAN 10.1.2.0


using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("SecondScriptExample");

int
main (int argc, char *argv[])
{
bool verbose = true;  //定义变量，用于决定是否开启两个UdpApplication的Logging组件;默认true开启
uint32_t nCsma = 3;   //LAN中另有3个node

CommandLine cmd;
cmd.AddValue ("nCsma", "Number of \"extra\" CSMA nodes/devices", nCsma);
cmd.AddValue ("verbose", "Tell echo applications to log if true", verbose); //命令行参数设置是否开启logging

cmd.Parse (argc,argv);

if (verbose)
{
LogComponentEnable("UdpEchoClientApplication", LOG_LEVEL_INFO);
LogComponentEnable("UdpEchoServerApplication", LOG_LEVEL_INFO);
}

nCsma = nCsma == 0 ? 1 : nCsma;       //三目运算符还可以这样写。。。。

/********************网络拓扑部分************************/
//创建使用P2P链路链接的2个node
NodeContainer p2pNodes;
p2pNodes.Create (2);

//创建另一个NodeContainer类对象，用于总线(CSMA)网络
NodeContainer csmaNodes;
csmaNodes.Add (p2pNodes.Get (1)); //将之前P2P的NodeContianer的第二个节点(索引1)添加到CSMA的NodeContainer，以获得CSMA device;这个node将会有两个device
csmaNodes.Create (nCsma);         //再创建Bus network上另外的node

//设置传送速率和信道延迟，同first.cc
PointToPointHelper pointToPoint;       //注意使用Helper的固定格式：
//1/helper对象声明及属性设置;
//2/devices对象声明及接收helper对象安装方法的返回列表，安装方法的参数为节点对象！
pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));

//安装P2P网卡设备到P2P网络节点，同first.cc
NetDeviceContainer p2pDevices;
p2pDevices = pointToPoint.Install (p2pNodes);

//类似于P2PHelper，CsmaHelper帮助创建和连接CSMA设备及信道
CsmaHelper csma;
csma.SetChannelAttribute ("DataRate", StringValue ("100Mbps"));   //数据率由channel属性指定，而非Device属性;
//因为CSMA不允许同一信道上有多个不同数据率的设备！
csma.SetChannelAttribute ("Delay", TimeValue (NanoSeconds (6560))); //speed-of-light delay???

NetDeviceContainer csmaDevices;
csmaDevices = csma.Install (csmaNodes);

//安装网络协议
InternetStackHelper stack;
stack.Install (p2pNodes.Get (0));     //P2P链路中的第一个节点
stack.Install (csmaNodes);            //P2P链路中的第二个节点包含在csmaNodes中

Ipv4AddressHelper address;                     //两个网段的IP地址类对象
address.SetBase ("10.1.1.0", "255.255.255.0"); //安排P2P网段的地址
Ipv4InterfaceContainer p2pInterfaces;
p2pInterfaces = address.Assign (p2pDevices);

address.SetBase ("10.1.2.0", "255.255.255.0"); //安排CSMA网段地址
Ipv4InterfaceContainer csmaInterfaces;
csmaInterfaces = address.Assign (csmaDevices);
/********************网络拓扑部分结束*********************/

/**********************应用程序部分*********************/
UdpEchoServerHelper echoServer (9);

ApplicationContainer serverApps = echoServer.Install (csmaNodes.Get (nCsma)); //将Server服务安装在CSMA网段的最后一个节点上，nCsma是可变的，所以不能用3
serverApps.Start (Seconds (1.0));
serverApps.Stop (Seconds (10.0));

UdpEchoClientHelper echoClient (csmaInterfaces.GetAddress (nCsma), 9);        //同first.cc
echoClient.SetAttribute ("MaxPackets", UintegerValue (1));
echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.)));
echoClient.SetAttribute ("PacketSize", UintegerValue (1024));

ApplicationContainer clientApps = echoClient.Install (p2pNodes.Get (0));      //同first.cc
clientApps.Start (Seconds (2.0));
clientApps.Stop (Seconds (10.0));
/**********************应用程序部分结束*********************/

/****************调用全局路由Helper帮助建立网络路由*******************/
Ipv4GlobalRoutingHelper::PopulateRoutingTables (); //全局路由管理器根据节点产生的链路通告为每个节点建立路由表

/****************开启pcap跟踪*******************/
//pointToPoint.EnablePcapAll ("second");        //开启P2PHelper类对象的pcap;"second"为保存文件的前缀名，两句的名称相同了？？？
//前缀后的节点号是<!全局节点号!>，不用担心名称相同！
//csma.EnablePcap ("second", csmaDevices.Get (1), true); //开启csmaHelper类对象的pcap
//使用csma网段索引为1的设备(第二个)进行sniff，True开启Promiscuous mode
//NodeContainer类对象的Get方法用于获得容器中给定索引下的节点，返回指向请求节点的指针！
//Node类对象的GetId返回节点的全局ID(即节点列表中的索引号)？？？？？？？
//注意之前使用的Get是NetDevice类的方法，以下使用的是Node类的方法！！
//NetDevice不用取得ID，可以直接使用(已验证);但Node需要进一步查找ID!!（已验证，不使用GetId无法通过）
//所以后边的两句和这样的两句是等效的(已验证)
//  “csma.EnablePcap ("second", csmaDevices.Get (nCsma), 0);”
//  “csma.EnablePcap ("second", csmaDevices.Get (nCsma-1), 0);”
pointToPoint.EnablePcap ("second", p2pNodes.Get (0)->GetId (), 0);
//最后一项为explicitFilename，默认false，不加也可;若true，将prefix作为文件名
//倒数第二项promiscuous，默认false，此处仅想跟踪一个设备，故设为0(false);当有一个节点和设备的promiscuous模式设为true时，CSMA网段其它节点便不再产生trace文件。
csma.EnablePcap ("second", csmaNodes.Get (nCsma)->GetId (), 0, false);
csma.EnablePcap ("second", csmaNodes.Get (nCsma-1)->GetId (), 0, false);

Simulator::Run ();
Simulator::Destroy ();
return 0;
}

2、加入wifi网络

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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 "ns3/core-module.h"
#include "ns3/simulator-module.h"
#include "ns3/node-module.h"
#include "ns3/helper-module.h"
#include "ns3/wifi-module.h"
#include "ns3/mobility-module.h"
// Default Network Topology
//
//   Wifi 10.1.3.0
//                 AP
//  *    *    *    *
//  |    |    |    |    10.1.1.0
// n5   n6   n7   n0 -------------- n1   n2   n3   n4
//                   point-to-point  |    |    |    |
//                                   ================
//                                     LAN 10.1.2.0
using namespace ns3;
NS_LOG_COMPONENT_DEFINE ("ThirdScriptExample");
int
main (int argc, char *argv[])
{
  bool verbose = true;
  uint32_t nCsma = 3;
  uint32_t nWifi = 3;
  CommandLine cmd;
  cmd.AddValue ("nCsma", "Number of \"extra\" CSMA nodes/devices", nCsma);
  cmd.AddValue ("nWifi", "Number of wifi STA devices", nWifi);
  cmd.AddValue ("verbose", "Tell echo applications to log if true", verbose);
  cmd.Parse (argc,argv);
  if (verbose)
    {
      LogComponentEnable("UdpEchoClientApplication", LOG_LEVEL_INFO);
      LogComponentEnable("UdpEchoServerApplication", LOG_LEVEL_INFO);
    }
  NodeContainer p2pNodes;
  p2pNodes.Create (2);
  PointToPointHelper pointToPoint;
  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
  pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));
  NetDeviceContainer p2pDevices;
  p2pDevices = pointToPoint.Install (p2pNodes);
  NodeContainer csmaNodes;
  csmaNodes.Add (p2pNodes.Get (1));
  csmaNodes.Create (nCsma);
  CsmaHelper csma;
  csma.SetChannelAttribute ("DataRate", StringValue ("100Mbps"));
  csma.SetChannelAttribute ("Delay", TimeValue (NanoSeconds (6560)));
  NetDeviceContainer csmaDevices;
  csmaDevices = csma.Install (csmaNodes);
  NodeContainer wifiStaNodes;
  wifiStaNodes.Create (nWifi);
  NodeContainer wifiApNode = p2pNodes.Get (0);
  YansWifiChannelHelper channel = YansWifiChannelHelper::Default ();
  YansWifiPhyHelper phy = YansWifiPhyHelper::Default ();
  phy.SetChannel (channel.Create ());
  WifiHelper wifi = WifiHelper::Default ();
  wifi.SetRemoteStationManager ("ns3::AarfWifiManager");
  NqosWifiMacHelper mac = NqosWifiMacHelper::Default ();

  Ssid ssid = Ssid ("ns-3-ssid");
  mac.SetType ("ns3::NqstaWifiMac",
    "Ssid", SsidValue (ssid),
    "ActiveProbing", BooleanValue (false));
  NetDeviceContainer staDevices;
  staDevices = wifi.Install (phy, mac, wifiStaNodes);
  mac.SetType ("ns3::NqapWifiMac",
    "Ssid", SsidValue (ssid));
  NetDeviceContainer apDevices;
  apDevices = wifi.Install (phy, mac, wifiApNode);
  MobilityHelper mobility;
  mobility.SetPositionAllocator ("ns3::GridPositionAllocator",
    "MinX", DoubleValue (0.0),
    "MinY", DoubleValue (0.0),
    "DeltaX", DoubleValue (5.0),
    "DeltaY", DoubleValue (10.0),
    "GridWidth", UintegerValue (3),
    "LayoutType", StringValue ("RowFirst"));
  mobility.SetMobilityModel ("ns3::RandomWalk2dMobilityModel",
    "Bounds", RectangleValue (Rectangle (-50, 50, -50, 50)));
  mobility.Install (wifiStaNodes);
  mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
  mobility.Install (wifiApNode);
  InternetStackHelper stack;
  stack.Install (csmaNodes);
  stack.Install (wifiApNode);
  stack.Install (wifiStaNodes);
  Ipv4AddressHelper address;
  address.SetBase ("10.1.1.0", "255.255.255.0");
  Ipv4InterfaceContainer p2pInterfaces;
  p2pInterfaces = address.Assign (p2pDevices);
  address.SetBase ("10.1.2.0", "255.255.255.0");
  Ipv4InterfaceContainer csmaInterfaces;
  csmaInterfaces = address.Assign (csmaDevices);
  address.SetBase ("10.1.3.0", "255.255.255.0");
  address.Assign (staDevices);
  address.Assign (apDevices);
  UdpEchoServerHelper echoServer (9);
  ApplicationContainer serverApps = echoServer.Install (csmaNodes.Get (nCsma));
  serverApps.Start (Seconds (1.0));
  serverApps.Stop (Seconds (10.0));
  UdpEchoClientHelper echoClient (csmaInterfaces.GetAddress (nCsma), 9);
  echoClient.SetAttribute ("MaxPackets", UintegerValue (1));
  echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.)));
  echoClient.SetAttribute ("PacketSize", UintegerValue (1024));
  ApplicationContainer clientApps =
    echoClient.Install (wifiStaNodes.Get (nWifi - 1));
  clientApps.Start (Seconds (2.0));
  clientApps.Stop (Seconds (10.0));
  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();
  Simulator::Stop (Seconds (10.0));
  pointToPoint.EnablePcapAll ("third");
  phy.EnablePcap ("third", apDevices.Get (0));
  csma.EnablePcap ("third", csmaDevices.Get (0), true);
  Simulator::Run ();
  Simulator::Destroy ();
  return 0;
}