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ns-3에서 c++ python 구현의 차이 예제

 

위 그림에서 가운데에 위치한 노드가 csma switch, 다른 4개가 터미널이다. 소스를 보자면, 처음에는 노드와 연결링크를 설정해 주고, 인터넷과 ip를 설정해 준 후 어플리케이션 onoff를 지정해준다. http://code.nsnam.org/ns-3-dev/file/03b1accee8d1/src/bridge/examples 에서 아래 소스(csma-bridge.cc, csma-bridge.py)를 확인할 수 있다.

 

실행방법(with visualizer)

./waf --run src/bridge/examples/csma-bridge --vis

./waf --pyrun src/bridge/examples/csma-bridge.py --vis

 

 

 

   

import ns.applications
import ns.bridge
import ns.core
import ns.csma
import ns.internet
import ns.network

if __name__ == '__main__':
    import sys
    main(sys.argv)

#include <iostream>
#include <fstream>
#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/applications-module.h"
#include "ns3/bridge-module.h"
#include "ns3/csma-module.h"
#include "ns3/internet-module.h"

using namespace ns3;

   

 def main(argv):
    cmd = ns.core.CommandLine()
    cmd.Parse(argv)

    terminals = ns.network.NodeContainer()
    terminals.Create(4)

    csmaSwitch = ns.network.NodeContainer()
    csmaSwitch.Create(1)

    csma = ns.csma.CsmaHelper()
    csma.SetChannelAttribute("DataRate", ns.network.DataRateValue(ns.network.DataRate(5000000)))
    csma.SetChannelAttribute("Delay", ns.core.TimeValue(ns.core.MilliSeconds(2)))

    terminalDevices = ns.network.NetDeviceContainer()
    switchDevices = ns.network.NetDeviceContainer()

    for i in range(4):
        link = csma.Install(ns.network.NodeContainer(ns.network.NodeContainer(terminals.Get(i)), csmaSwitch))
        terminalDevices.Add(link.Get(0))
        switchDevices.Add(link.Get(1))

    switchNode = csmaSwitch.Get(0)
    bridgeDevice = ns.bridge.BridgeNetDevice()
    switchNode.AddDevice(bridgeDevice)

    for portIter in range(switchDevices.GetN()):
        bridgeDevice.AddBridgePort(switchDevices.Get(portIter))

 int main (int argc, char *argv[]) {
  CommandLine cmd;
  cmd.Parse (argc, argv);

  NodeContainer terminals;
  terminals.Create (4);

  NodeContainer csmaSwitch;
  csmaSwitch.Create (1);

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

  NetDeviceContainer terminalDevices;
  NetDeviceContainer switchDevices;

  for (int i = 0; i < 4; i++) {
      NetDeviceContainer link = csma.Install (NodeContainer (terminals.Get (i), csmaSwitch));
      terminalDevices.Add (link.Get (0));
      switchDevices.Add (link.Get (1));
    }

  Ptr<Node> switchNode = csmaSwitch.Get (0);
  BridgeHelper bridge;
  bridge.Install (switchNode, switchDevices);

   

    internet = ns.internet.InternetStackHelper()
    internet.Install(terminals)

    ipv4 = ns.internet.Ipv4AddressHelper()
    ipv4.SetBase(ns.network.Ipv4Address("10.1.1.0"), ns.network.Ipv4Mask("255.255.255.0"))
    ipv4.Assign(terminalDevices)

    port = 9   # Discard port(RFC 863)

    onoff = ns.applications.OnOffHelper("ns3::UdpSocketFactory",
                            ns.network.Address(ns.network.InetSocketAddress(ns.network.Ipv4Address("10.1.1.2"), port)))
    onoff.SetAttribute("OnTime", ns.core.StringValue ("ns3::ConstantRandomVariable[Constant=1]"))
    onoff.SetAttribute("OffTime", ns.core.StringValue ("ns3::ConstantRandomVariable[Constant=0]"))

  InternetStackHelper internet;
  internet.Install (terminals);

  Ipv4AddressHelper ipv4;
  ipv4.SetBase ("10.1.1.0", "255.255.255.0");
  ipv4.Assign (terminalDevices);


  uint16_t port = 9;   // Discard port (RFC 863)

  OnOffHelper onoff ("ns3::UdpSocketFactory",
                     Address (InetSocketAddress (Ipv4Address ("10.1.1.2"), port)));


  onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1)));
  onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0)));

   
     app = onoff.Install(ns.network.NodeContainer(terminals.Get(0)))
    app.Start(ns.core.Seconds(1.0))
    app.Stop(ns.core.Seconds(10.0))

    sink = ns.applications.PacketSinkHelper("ns3::UdpSocketFactory",
                                ns.network.Address(ns.network.InetSocketAddress(ns.network.Ipv4Address.GetAny(), port)))
    app = sink.Install(ns.network.NodeContainer(terminals.Get(1)))
    app.Start(ns.core.Seconds(0.0))

    onoff.SetAttribute("Remote",
                       ns.network.AddressValue(ns.network.InetSocketAddress(ns.network.Ipv4Address("10.1.1.1"), port)))
    app = onoff.Install(ns.network.NodeContainer(terminals.Get(3)))
    app.Start(ns.core.Seconds(1.1))
    app.Stop(ns.core.Seconds(10.0))

    app = sink.Install(ns.network.NodeContainer(terminals.Get(0)))
    app.Start(ns.core.Seconds(0.0))

    #ascii = ns.network.AsciiTraceHelper();
    #csma.EnableAsciiAll(ascii.CreateFileStream ("csma-bridge.tr"));

    csma.EnablePcapAll("csma-bridge", False)

    ns.core.Simulator.Run()
    ns.core.Simulator.Destroy()
 

   ApplicationContainer app = onoff.Install (terminals.Get (0));
  app.Start (Seconds (1.0));
  app.Stop (Seconds (10.0));

  PacketSinkHelper sink ("ns3::UdpSocketFactory",
                         Address (InetSocketAddress (Ipv4Address::GetAny (), port)));


  app = sink.Install (terminals.Get (1));
  app.Start (Seconds (0.0));

  onoff.SetAttribute ("Remote",
                      AddressValue (InetSocketAddress (Ipv4Address ("10.1.1.1"), port)));


  app = onoff.Install (terminals.Get (3));
  app.Start (Seconds (1.1));
  app.Stop (Seconds (10.0));

  app = sink.Install (terminals.Get (0));
  app.Start (Seconds (0.0));

  AsciiTraceHelper ascii;
  csma.EnableAsciiAll (ascii.CreateFileStream ("csma-bridge.tr"));

  csma.EnablePcapAll ("csma-bridge", false);

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

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