Computer_Network_Laboratory/02.Ping.cc at master · vtucs/Computer_Network_Laboratory · GitHub

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/*
2. Implement transmission of ping messages/trace route over a network topology
consisting of 6 nodes and find the number of packets dropped due to congestion.
*/

#include <iostream>
#include <fstream>
#include <string>
#include <cassert>

#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/csma-module.h"
#include "ns3/applications-module.h"
#include "ns3/internet-apps-module.h"
#include "ns3/internet-module.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE("CsmaPingExample");

static void PingRtt(std::string context, Time rtt)
{
    std::cout << context << " " << rtt << std::endl;
}

int main(int argc, char *argv[])
{

    CommandLine cmd;
    cmd.Parse(argc, argv);

    // Here, we will explicitly create four nodes.
    NS_LOG_INFO("Create nodes.");
    NodeContainer c;
    c.Create(6);

    // connect all our nodes to a shared channel.
    NS_LOG_INFO("Build Topology.");
    CsmaHelper csma;
    csma.SetChannelAttribute("DataRate", DataRateValue(DataRate(10000)));
    csma.SetChannelAttribute("Delay", TimeValue(MilliSeconds(0.2)));
    NetDeviceContainer devs = csma.Install(c);

    // add an ip stack to all nodes.
    NS_LOG_INFO("Add ip stack.");
    InternetStackHelper ipStack;
    ipStack.Install(c);

    // assign ip addresses
    NS_LOG_INFO("Assign ip addresses.");
    Ipv4AddressHelper ip;
    ip.SetBase("192.168.1.0", "255.255.255.0");
    Ipv4InterfaceContainer addresses = ip.Assign(devs);

    NS_LOG_INFO("Create Sink.");

    // Create an OnOff application to send UDP datagrams from node zero to //node 1.
    NS_LOG_INFO("Create Applications.");
    uint16_t port = 9; // Discard port (RFC 863)

    OnOffHelper onoff("ns3::UdpSocketFactory",
                      Address(InetSocketAddress(addresses.GetAddress(2), port)));
    onoff.SetConstantRate(DataRate("500Mb/s"));

    ApplicationContainer app = onoff.Install(c.Get(0));
    // Start the application
    app.Start(Seconds(6.0));
    app.Stop(Seconds(10.0));

    // Create an optional packet sink to receive these packets
    PacketSinkHelper sink("ns3::UdpSocketFactory",
                          Address(InetSocketAddress(Ipv4Address::GetAny(), port)));
    app = sink.Install(c.Get(2));
    app.Start(Seconds(0.0));

    NS_LOG_INFO("Create pinger");
    V4PingHelper ping = V4PingHelper(addresses.GetAddress(2));
    NodeContainer pingers;
    pingers.Add(c.Get(0));
    pingers.Add(c.Get(1));

    ApplicationContainer apps;
    apps = ping.Install(pingers);
    apps.Start(Seconds(1.0));
    apps.Stop(Seconds(5.0));

    // finally, print the ping rtts.
    Config::Connect("/NodeList/*/ApplicationList/*/$ns3::V4Ping/Rtt",
                    MakeCallback(&PingRtt));

    NS_LOG_INFO("Run Simulation.");

    AsciiTraceHelper ascii;
    csma.EnableAsciiAll(ascii.CreateFileStream("ping1.tr"));

    Simulator::Run();
    Simulator::Destroy();
    NS_LOG_INFO("Done.");
}