adaptive-red-tests.cc

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/*
 * Copyright (c) 2015 NITK Surathkal
 *
 * 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
 *
 * Author: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
 *
 */
 
/**
 * NOTE: These validation tests are same as provided in ns-2
 * (ns/tcl/test/test-suite-adaptive-red.tcl)
 *
 * In this code, tests 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15 refer to tests
 * named red1, red1Adapt, red1ECN, fastlink, fastlinkECN, fastlinkAutowq, fastlinkAutothresh,
 * fastlinkAdaptive, fastlinkAllAdapt, fastlinkAllAdaptECN, fastlinkAllAdapt1, longlink,
 * longlinkAdapt and longlinkAdapt1, respectively in the ns-2 file
 * mentioned above.
 */
 
/** Network topology for tests: 1, 2, 3 and 4
 *
 *    10Mb/s, 2ms                            10Mb/s, 4ms
 * n0--------------|                    |---------------n4
 *                 |    1.5Mbps, 20ms   |
 *                 n2------------------n3
 *    10Mb/s, 3ms  |  QueueLimit = 25   |    10Mb/s, 5ms
 * n1--------------|                    |---------------n5
 *
 */
 
/** Network topology for tests: 6, 7, 8, 9, 10, 11 and 12
 *
 *    100Mb/s, 2ms                          100Mb/s, 4ms
 * n0--------------|                    |---------------n4
 *                 |    15Mbps, 20ms    |
 *                 n2------------------n3
 *    100Mb/s, 3ms |  QueueLimit = 1000 |   100Mb/s, 5ms
 * n1--------------|                    |---------------n5
 *
 */
 
/** Network topology for tests: 13, 14 and 15
 *
 *    10Mb/s, 0ms                            10Mb/s, 2ms
 * n0--------------|                    |---------------n4
 *                 |    1.5Mbps, 100ms  |
 *                 n2------------------n3
 *    10Mb/s, 1ms  |  QueueLimit = 100  |    10Mb/s, 3ms
 * n1--------------|                    |---------------n5
 *
 */
 
#include "ns3/applications-module.h"
#include "ns3/core-module.h"
#include "ns3/flow-monitor-helper.h"
#include "ns3/internet-module.h"
#include "ns3/network-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/traffic-control-module.h"
 
using namespace ns3;
 
NS_LOG_COMPONENT_DEFINE("AdaptiveRedTests");
 
uint32_t checkTimes;     //!< Number of times the queues have been checked.
double avgQueueDiscSize; //!< Average QueueDisc size.
 
// The times
double global_start_time; //!< Global start time
double global_stop_time;  //!< Global stop time.
double sink_start_time;   //!< Sink start time.
double sink_stop_time;    //!< Sink stop time.
double client_start_time; //!< Client start time.
double client_stop_time;  //!< Client stop time.
 
NodeContainer n0n2; //!< Nodecontainer n0 + n2.
NodeContainer n1n2; //!< Nodecontainer n1 + n2.
NodeContainer n2n3; //!< Nodecontainer n2 + n3.
NodeContainer n3n4; //!< Nodecontainer n3 + n4.
NodeContainer n3n5; //!< Nodecontainer n3 + n5.
 
Ipv4InterfaceContainer i0i2; //!< IPv4 interface container i0 + i2.
Ipv4InterfaceContainer i1i2; //!< IPv4 interface container i1 + i2.
Ipv4InterfaceContainer i2i3; //!< IPv4 interface container i2 + i3.
Ipv4InterfaceContainer i3i4; //!< IPv4 interface container i3 + i4.
Ipv4InterfaceContainer i3i5; //!< IPv4 interface container i3 + i5.
 
std::stringstream filePlotQueueDisc;    //!< Output file name for queue disc size.
std::stringstream filePlotQueueDiscAvg; //!< Output file name for queue disc average.
 
/**
 * Check the queue disc size and write its stats to the output files.
 *
 * \param queue The queue to check.
 */
void
CheckQueueDiscSize(Ptr<QueueDisc> queue)
{
    uint32_t qSize = queue->GetCurrentSize().GetValue();
 
    avgQueueDiscSize += qSize;
    checkTimes++;
 
    // check queue disc size every 1/100 of a second
    Simulator::Schedule(Seconds(0.01), &CheckQueueDiscSize, queue);
 
    std::ofstream fPlotQueueDisc(filePlotQueueDisc.str(), std::ios::out | std::ios::app);
    fPlotQueueDisc << Simulator::Now().GetSeconds() << " " << qSize << std::endl;
    fPlotQueueDisc.close();
 
    std::ofstream fPlotQueueDiscAvg(filePlotQueueDiscAvg.str(), std::ios::out | std::ios::app);
    fPlotQueueDiscAvg << Simulator::Now().GetSeconds() << " " << avgQueueDiscSize / checkTimes
                      << std::endl;
    fPlotQueueDiscAvg.close();
}
 
/**
 * Setup the apps.
 *
 * \param test The test number.
 */
void
BuildAppsTest(uint32_t test)
{
    // SINK is in the right side
    uint16_t port = 50000;
    Address sinkLocalAddress(InetSocketAddress(Ipv4Address::GetAny(), port));
    PacketSinkHelper sinkHelper("ns3::TcpSocketFactory", sinkLocalAddress);
    ApplicationContainer sinkApp = sinkHelper.Install(n3n4.Get(1));
    sinkApp.Start(Seconds(sink_start_time));
    sinkApp.Stop(Seconds(sink_stop_time));
 
    // Connection one
    // Clients are in left side
    /*
     * Create the OnOff applications to send TCP to the server
     * onoffhelper is a client that send data to TCP destination
     */
    OnOffHelper clientHelper1("ns3::TcpSocketFactory", Address());
    clientHelper1.SetAttribute("OnTime", StringValue("ns3::ConstantRandomVariable[Constant=1]"));
    clientHelper1.SetAttribute("OffTime", StringValue("ns3::ConstantRandomVariable[Constant=0]"));
    clientHelper1.SetAttribute("PacketSize", UintegerValue(1000));
 
    // Connection two
    OnOffHelper clientHelper2("ns3::TcpSocketFactory", Address());
    clientHelper2.SetAttribute("OnTime", StringValue("ns3::ConstantRandomVariable[Constant=1]"));
    clientHelper2.SetAttribute("OffTime", StringValue("ns3::ConstantRandomVariable[Constant=0]"));
    clientHelper2.SetAttribute("PacketSize", UintegerValue(1000));
 
    if (test == 6 || test == 7 || test == 8 || test == 9 || test == 10 || test == 12)
    {
        clientHelper1.SetAttribute("DataRate", DataRateValue(DataRate("100Mb/s")));
        clientHelper2.SetAttribute("DataRate", DataRateValue(DataRate("100Mb/s")));
    }
    else
    {
        clientHelper1.SetAttribute("DataRate", DataRateValue(DataRate("10Mb/s")));
        clientHelper2.SetAttribute("DataRate", DataRateValue(DataRate("10Mb/s")));
    }
 
    ApplicationContainer clientApps1;
    AddressValue remoteAddress(InetSocketAddress(i3i4.GetAddress(1), port));
    clientHelper1.SetAttribute("Remote", remoteAddress);
    clientApps1.Add(clientHelper1.Install(n0n2.Get(0)));
    clientApps1.Start(Seconds(client_start_time));
    clientApps1.Stop(Seconds(client_stop_time));
 
    ApplicationContainer clientApps2;
    clientHelper2.SetAttribute("Remote", remoteAddress);
    clientApps2.Add(clientHelper2.Install(n1n2.Get(0)));
    clientApps2.Start(Seconds(client_start_time));
    clientApps2.Stop(Seconds(client_stop_time));
}
 
int
main(int argc, char* argv[])
{
    LogComponentEnable("RedQueueDisc", LOG_LEVEL_INFO);
 
    uint32_t aredTest;
    std::string aredLinkDataRate = "1.5Mbps";
    std::string aredLinkDelay = "20ms";
 
    std::string pathOut;
    bool writeForPlot = false;
    bool writePcap = false;
    bool flowMonitor = false;
 
    bool printAredStats = true;
 
    global_start_time = 0.0;
    sink_start_time = global_start_time;
    client_start_time = global_start_time + 1.5;
    global_stop_time = 7.0;
    sink_stop_time = global_stop_time + 3.0;
    client_stop_time = global_stop_time - 2.0;
 
    // Configuration and command line parameter parsing
    aredTest = 1;
    // Will only save in the directory if enable opts below
    pathOut = "."; // Current directory
    CommandLine cmd(__FILE__);
    cmd.AddValue("testNumber",
                 "Run test 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15",
                 aredTest);
    cmd.AddValue("pathOut",
                 "Path to save results from --writeForPlot/--writePcap/--writeFlowMonitor",
                 pathOut);
    cmd.AddValue("writeForPlot", "Write results for plot (gnuplot)", writeForPlot);
    cmd.AddValue("writePcap", "Write results in pcapfile", writePcap);
    cmd.AddValue("writeFlowMonitor", "Enable Flow Monitor and write their results", flowMonitor);
 
    cmd.Parse(argc, argv);
    if ((aredTest < 1) || (aredTest == 5) || (aredTest > 15))
    {
        std::cout << "Invalid test number. Supported tests are 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, "
                     "13, 14 or 15"
                  << std::endl;
        exit(1);
    }
 
    NS_LOG_INFO("Create nodes");
    NodeContainer c;
    c.Create(6);
    Names::Add("N0", c.Get(0));
    Names::Add("N1", c.Get(1));
    Names::Add("N2", c.Get(2));
    Names::Add("N3", c.Get(3));
    Names::Add("N4", c.Get(4));
    Names::Add("N5", c.Get(5));
    n0n2 = NodeContainer(c.Get(0), c.Get(2));
    n1n2 = NodeContainer(c.Get(1), c.Get(2));
    n2n3 = NodeContainer(c.Get(2), c.Get(3));
    n3n4 = NodeContainer(c.Get(3), c.Get(4));
    n3n5 = NodeContainer(c.Get(3), c.Get(5));
 
    Config::SetDefault("ns3::TcpL4Protocol::SocketType", StringValue("ns3::TcpNewReno"));
    // 42 = headers size
    Config::SetDefault("ns3::TcpSocket::SegmentSize", UintegerValue(1000 - 42));
    Config::SetDefault("ns3::TcpSocket::DelAckCount", UintegerValue(1));
    GlobalValue::Bind("ChecksumEnabled", BooleanValue(false));
 
    uint32_t meanPktSize = 1000;
 
    // RED params
    NS_LOG_INFO("Set RED params");
    Config::SetDefault("ns3::RedQueueDisc::MaxSize", StringValue("1000p"));
    Config::SetDefault("ns3::RedQueueDisc::MeanPktSize", UintegerValue(meanPktSize));
    Config::SetDefault("ns3::RedQueueDisc::Wait", BooleanValue(true));
    Config::SetDefault("ns3::RedQueueDisc::Gentle", BooleanValue(true));
    Config::SetDefault("ns3::RedQueueDisc::QW", DoubleValue(0.002));
    Config::SetDefault("ns3::RedQueueDisc::MinTh", DoubleValue(5));
    Config::SetDefault("ns3::RedQueueDisc::MaxTh", DoubleValue(15));
 
    if (aredTest == 1) // test 1: red1
    {
        Config::SetDefault("ns3::RedQueueDisc::MaxSize", StringValue("25p"));
    }
    else if (aredTest == 2) // test 2: red1Adapt
    {
        Config::SetDefault("ns3::RedQueueDisc::ARED", BooleanValue(true));
        Config::SetDefault("ns3::RedQueueDisc::LInterm", DoubleValue(10));
        Config::SetDefault("ns3::RedQueueDisc::MaxSize", StringValue("25p"));
    }
    else if (aredTest == 3) // test 3: red1ECN
    {
        Config::SetDefault("ns3::RedQueueDisc::MaxSize", StringValue("25p"));
        Config::SetDefault("ns3::TcpSocketBase::UseEcn", StringValue("On"));
        Config::SetDefault("ns3::RedQueueDisc::UseEcn", BooleanValue(true));
    }
    else if (aredTest == 4) // test 4: red1AdaptECN
    {
        Config::SetDefault("ns3::RedQueueDisc::ARED", BooleanValue(true));
        Config::SetDefault("ns3::RedQueueDisc::LInterm", DoubleValue(10));
        Config::SetDefault("ns3::RedQueueDisc::MaxSize", StringValue("25p"));
        Config::SetDefault("ns3::TcpSocketBase::UseEcn", StringValue("On"));
        Config::SetDefault("ns3::RedQueueDisc::UseEcn", BooleanValue(true));
    }
    else if (aredTest == 7) // test 7: fastlinkAutowq
    {
        Config::SetDefault("ns3::RedQueueDisc::QW", DoubleValue(0.0));
    }
    else if (aredTest == 8) // test 8: fastlinkAutothresh
    {
        Config::SetDefault("ns3::RedQueueDisc::MinTh", DoubleValue(0));
        Config::SetDefault("ns3::RedQueueDisc::MaxTh", DoubleValue(0));
    }
    else if (aredTest == 9) // test 9: fastlinkAdaptive
    {
        Config::SetDefault("ns3::RedQueueDisc::AdaptMaxP", BooleanValue(true));
        Config::SetDefault("ns3::RedQueueDisc::LInterm", DoubleValue(10));
    }
    else if (aredTest == 10) // test 10: fastlinkAllAdapt
    {
        Config::SetDefault("ns3::RedQueueDisc::ARED", BooleanValue(true));
        Config::SetDefault("ns3::RedQueueDisc::LInterm", DoubleValue(10));
    }
    else if (aredTest == 11) // test 11: fastlinkAllAdaptECN
    {
        Config::SetDefault("ns3::RedQueueDisc::ARED", BooleanValue(true));
        Config::SetDefault("ns3::RedQueueDisc::UseHardDrop", BooleanValue(false));
        Config::SetDefault("ns3::RedQueueDisc::LInterm", DoubleValue(10));
        Config::SetDefault("ns3::TcpSocketBase::UseEcn", StringValue("On"));
        Config::SetDefault("ns3::RedQueueDisc::UseEcn", BooleanValue(true));
    }
    else if (aredTest == 12) // test 12: fastlinkAllAdapt1
    {
        Config::SetDefault("ns3::RedQueueDisc::ARED", BooleanValue(true));
        Config::SetDefault("ns3::RedQueueDisc::LInterm", DoubleValue(10));
        Config::SetDefault("ns3::RedQueueDisc::TargetDelay", TimeValue(Seconds(0.2)));
    }
    else if (aredTest == 13) // test 13: longlink
    {
        Config::SetDefault("ns3::RedQueueDisc::MaxSize", StringValue("100p"));
    }
    else if (aredTest == 14) // test 14: longlinkAdapt
    {
        Config::SetDefault("ns3::RedQueueDisc::ARED", BooleanValue(true));
        Config::SetDefault("ns3::RedQueueDisc::LInterm", DoubleValue(10));
        Config::SetDefault("ns3::RedQueueDisc::MaxSize", StringValue("100p"));
    }
    else if (aredTest == 15) // test 15: longlinkAdapt1
    {
        Config::SetDefault("ns3::RedQueueDisc::QW", DoubleValue(-1.0));
        Config::SetDefault("ns3::RedQueueDisc::MinTh", DoubleValue(0));
        Config::SetDefault("ns3::RedQueueDisc::MaxTh", DoubleValue(0));
        Config::SetDefault("ns3::RedQueueDisc::AdaptMaxP", BooleanValue(true));
        Config::SetDefault("ns3::RedQueueDisc::LInterm", DoubleValue(10));
        Config::SetDefault("ns3::RedQueueDisc::MaxSize", StringValue("100p"));
    }
 
    NS_LOG_INFO("Install internet stack on all nodes.");
    InternetStackHelper internet;
    internet.Install(c);
 
    TrafficControlHelper tchPfifo;
    uint16_t handle = tchPfifo.SetRootQueueDisc("ns3::PfifoFastQueueDisc");
    tchPfifo.AddInternalQueues(handle, 3, "ns3::DropTailQueue", "MaxSize", StringValue("1000p"));
 
    TrafficControlHelper tchRed;
    tchRed.SetRootQueueDisc("ns3::RedQueueDisc",
                            "LinkBandwidth",
                            StringValue(aredLinkDataRate),
                            "LinkDelay",
                            StringValue(aredLinkDelay));
 
    NS_LOG_INFO("Create channels");
    PointToPointHelper p2p;
 
    NetDeviceContainer devn0n2;
    NetDeviceContainer devn1n2;
    NetDeviceContainer devn2n3;
    NetDeviceContainer devn3n4;
    NetDeviceContainer devn3n5;
 
    QueueDiscContainer queueDiscs;
 
    if (aredTest == 1 || aredTest == 2 || aredTest == 3 || aredTest == 4)
    {
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("10Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("2ms"));
        devn0n2 = p2p.Install(n0n2);
        tchPfifo.Install(devn0n2);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("10Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("3ms"));
        devn1n2 = p2p.Install(n1n2);
        tchPfifo.Install(devn1n2);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue(aredLinkDataRate));
        p2p.SetChannelAttribute("Delay", StringValue(aredLinkDelay));
        devn2n3 = p2p.Install(n2n3);
        // only backbone link has ARED queue disc
        queueDiscs = tchRed.Install(devn2n3);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("10Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("4ms"));
        devn3n4 = p2p.Install(n3n4);
        tchPfifo.Install(devn3n4);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("10Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("5ms"));
        devn3n5 = p2p.Install(n3n5);
        tchPfifo.Install(devn3n5);
    }
    else if (aredTest == 13 || aredTest == 14 || aredTest == 15)
    {
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("10Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("0ms"));
        devn0n2 = p2p.Install(n0n2);
        tchPfifo.Install(devn0n2);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("10Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("1ms"));
        devn1n2 = p2p.Install(n1n2);
        tchPfifo.Install(devn1n2);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue(aredLinkDataRate));
        p2p.SetChannelAttribute("Delay", StringValue("100ms"));
        devn2n3 = p2p.Install(n2n3);
        // only backbone link has ARED queue disc
        queueDiscs = tchRed.Install(devn2n3);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("10Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("2ms"));
        devn3n4 = p2p.Install(n3n4);
        tchPfifo.Install(devn3n4);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("10Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("3ms"));
        devn3n5 = p2p.Install(n3n5);
        tchPfifo.Install(devn3n5);
    }
    else if (aredTest == 6 || aredTest == 7 || aredTest == 8 || aredTest == 9 || aredTest == 10 ||
             aredTest == 11 || aredTest == 12)
    {
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("100Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("2ms"));
        devn0n2 = p2p.Install(n0n2);
        tchPfifo.Install(devn0n2);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("100Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("3ms"));
        devn1n2 = p2p.Install(n1n2);
        tchPfifo.Install(devn1n2);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("15Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue(aredLinkDelay));
        devn2n3 = p2p.Install(n2n3);
        // only backbone link has ARED queue disc
        queueDiscs = tchRed.Install(devn2n3);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("100Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("4ms"));
        devn3n4 = p2p.Install(n3n4);
        tchPfifo.Install(devn3n4);
 
        p2p.SetQueue("ns3::DropTailQueue");
        p2p.SetDeviceAttribute("DataRate", StringValue("100Mbps"));
        p2p.SetChannelAttribute("Delay", StringValue("5ms"));
        devn3n5 = p2p.Install(n3n5);
        tchPfifo.Install(devn3n5);
    }
 
    NS_LOG_INFO("Assign IP Addresses");
    Ipv4AddressHelper ipv4;
 
    ipv4.SetBase("10.1.1.0", "255.255.255.0");
    i0i2 = ipv4.Assign(devn0n2);
 
    ipv4.SetBase("10.1.2.0", "255.255.255.0");
    i1i2 = ipv4.Assign(devn1n2);
 
    ipv4.SetBase("10.1.3.0", "255.255.255.0");
    i2i3 = ipv4.Assign(devn2n3);
 
    ipv4.SetBase("10.1.4.0", "255.255.255.0");
    i3i4 = ipv4.Assign(devn3n4);
 
    ipv4.SetBase("10.1.5.0", "255.255.255.0");
    i3i5 = ipv4.Assign(devn3n5);
 
    // Set up the routing
    Ipv4GlobalRoutingHelper::PopulateRoutingTables();
 
    BuildAppsTest(aredTest);
 
    if (writePcap)
    {
        PointToPointHelper ptp;
        std::stringstream stmp;
        stmp << pathOut << "/ared";
        ptp.EnablePcapAll(stmp.str());
    }
 
    Ptr<FlowMonitor> flowmon;
    if (flowMonitor)
    {
        FlowMonitorHelper flowmonHelper;
        flowmon = flowmonHelper.InstallAll();
    }
 
    if (writeForPlot)
    {
        filePlotQueueDisc << pathOut << "/"
                          << "ared-queue-disc.plotme";
        filePlotQueueDiscAvg << pathOut << "/"
                             << "ared-queue-disc_avg.plotme";
 
        remove(filePlotQueueDisc.str().c_str());
        remove(filePlotQueueDiscAvg.str().c_str());
        Ptr<QueueDisc> queue = queueDiscs.Get(0);
        Simulator::ScheduleNow(&CheckQueueDiscSize, queue);
    }
 
    Simulator::Stop(Seconds(sink_stop_time));
    Simulator::Run();
 
    QueueDisc::Stats st = queueDiscs.Get(0)->GetStats();
 
    if (st.GetNDroppedPackets(RedQueueDisc::UNFORCED_DROP) == 0 &&
        st.GetNMarkedPackets(RedQueueDisc::UNFORCED_MARK) == 0)
    {
        std::cout << "There should be some unforced drops or marks" << std::endl;
        exit(1);
    }
 
    if (aredTest == 1 || aredTest == 2 || aredTest == 3 || aredTest == 4 || aredTest == 13)
    {
        if (st.GetNDroppedPackets(QueueDisc::INTERNAL_QUEUE_DROP) == 0)
        {
            std::cout << "There should be some drops due to queue full" << std::endl;
            exit(1);
        }
    }
    else
    {
        if (st.GetNDroppedPackets(QueueDisc::INTERNAL_QUEUE_DROP) != 0)
        {
            std::cout << "There should be zero drops due to queue full" << std::endl;
            exit(1);
        }
    }
 
    if (flowMonitor)
    {
        std::stringstream stmp;
        stmp << pathOut << "/ared.flowmon";
 
        flowmon->SerializeToXmlFile(stmp.str(), false, false);
    }
 
    if (printAredStats)
    {
        std::cout << "*** ARED stats from Node 2 queue ***" << std::endl;
        std::cout << st << std::endl;
    }
 
    Simulator::Destroy();
 
    return 0;
}