Set TOS field


N0(UDP Sender)----P2Plink(5Mbps,2ms)---N1(UDP Sink)


When the packet sent from N0, the TOS (type of service field in the IP header) will be set. (put this file under scratch)

#include <fstream>

#include <string.h>


#include "ns3/core-module.h"

#include "ns3/internet-module.h"

#include "ns3/point-to-point-module.h"

#include "ns3/packet-sink.h"

#include "ns3/packet-sink-helper.h"

#include "ns3/on-off-helper.h"


using namespace ns3;






main (int argc, char *argv[])


  NS_LOG_INFO ("Create nodes.");

  NodeContainer n;

  n.Create (2);


  InternetStackHelper internet;

  internet.Install (n);


  NS_LOG_INFO ("Create channels.");


  PointToPointHelper pointToPoint;

  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));

  pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));

  pointToPoint.SetDeviceAttribute("Mtu", UintegerValue(1400));  

  NetDeviceContainer p2pDevices;

  p2pDevices = pointToPoint.Install (n);    


  Ipv4AddressHelper ipv4;


  NS_LOG_INFO ("Assign IP Addresses.");

  ipv4.SetBase ("", "");

  Ipv4InterfaceContainer i = ipv4.Assign (p2pDevices);


  NS_LOG_INFO ("Create Applications.");


  PacketSinkHelper sinkHelper ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), 9));

  ApplicationContainer sinkApp = sinkHelper.Install (n.Get(1));


  InetSocketAddress sinkSocket (i.GetAddress (1), 9);

  //std::vector<uint8_t> tosValues = {0x70, 0x28, 0xb8, 0xc0}; //AC_BE, AC_BK, AC_VI, AC_VO

  sinkSocket.SetTos (0xc0);

  OnOffHelper server ("ns3::UdpSocketFactory", sinkSocket);

  server.SetAttribute ("PacketSize", UintegerValue (172)); // G.711 encoding, 20ms delay, 160bytes +12bytes(rtp)

  server.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));

  server.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));

  server.SetAttribute ("DataRate", DataRateValue (DataRate ("64Kbps")));

  ApplicationContainer serverApp = server.Install (n.Get(0));


  sinkApp.Start (Seconds (0.0));

  serverApp.Start (Seconds (1.0));


  Simulator::Stop (Seconds (12.0));


  NS_LOG_INFO ("Run Simulation.");

  Simulator::Run ();

  Simulator::Destroy ();

  NS_LOG_INFO ("Done.");





After simulation, you will get tos-udp-0-1.pcap and tos-udp-1-0.pcap.



Back to NS3 Learning Guide

Last Modified: 2022/2/6 done



Dr. Chih-Heng Ke

Department of Computer Science and Information Engineering, National Quemoy University, Kinmen, Taiwan