NS3仿真软件与外部通信
//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 ();
}
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