140 lines
4.9 KiB
C++
140 lines
4.9 KiB
C++
/*
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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#include "tutorial-app.h"
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#include "ns3/applications-module.h"
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#include "ns3/core-module.h"
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#include "ns3/internet-module.h"
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#include "ns3/network-module.h"
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#include "ns3/point-to-point-module.h"
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#include <fstream>
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE("FifthScriptExample");
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// ===========================================================================
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//
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// node 0 node 1
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// +----------------+ +----------------+
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// | ns-3 TCP | | ns-3 TCP |
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// +----------------+ +----------------+
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// | 10.1.1.1 | | 10.1.1.2 |
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// +----------------+ +----------------+
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// | point-to-point | | point-to-point |
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// +----------------+ +----------------+
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// | |
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// +---------------------+
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// 5 Mbps, 2 ms
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//
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//
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// We want to look at changes in the ns-3 TCP congestion window. We need
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// to crank up a flow and hook the CongestionWindow attribute on the socket
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// of the sender. Normally one would use an on-off application to generate a
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// flow, but this has a couple of problems. First, the socket of the on-off
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// application is not created until Application Start time, so we wouldn't be
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// able to hook the socket (now) at configuration time. Second, even if we
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// could arrange a call after start time, the socket is not public so we
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// couldn't get at it.
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//
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// So, we can cook up a simple version of the on-off application that does what
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// we want. On the plus side we don't need all of the complexity of the on-off
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// application. On the minus side, we don't have a helper, so we have to get
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// a little more involved in the details, but this is trivial.
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//
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// So first, we create a socket and do the trace connect on it; then we pass
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// this socket into the constructor of our simple application which we then
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// install in the source node.
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// ===========================================================================
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//
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/**
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* Congestion window change callback
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*
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* @param oldCwnd Old congestion window.
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* @param newCwnd New congestion window.
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*/
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static void
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CwndChange(uint32_t oldCwnd, uint32_t newCwnd)
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{
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NS_LOG_UNCOND(Simulator::Now().GetSeconds() << "\t" << newCwnd);
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}
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/**
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* Rx drop callback
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*
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* @param p The dropped packet.
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*/
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static void
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RxDrop(Ptr<const Packet> p)
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{
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NS_LOG_UNCOND("RxDrop at " << Simulator::Now().GetSeconds());
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}
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int
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main(int argc, char* argv[])
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{
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CommandLine cmd(__FILE__);
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cmd.Parse(argc, argv);
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// In the following three lines, TCP NewReno is used as the congestion
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// control algorithm, the initial congestion window of a TCP connection is
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// set to 1 packet, and the classic fast recovery algorithm is used. Note
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// that this configuration is used only to demonstrate how TCP parameters
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// can be configured in ns-3. Otherwise, it is recommended to use the default
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// settings of TCP in ns-3.
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Config::SetDefault("ns3::TcpL4Protocol::SocketType", StringValue("ns3::TcpNewReno"));
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Config::SetDefault("ns3::TcpSocket::InitialCwnd", UintegerValue(1));
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Config::SetDefault("ns3::TcpL4Protocol::RecoveryType",
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TypeIdValue(TypeId::LookupByName("ns3::TcpClassicRecovery")));
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NodeContainer nodes;
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nodes.Create(2);
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PointToPointHelper pointToPoint;
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pointToPoint.SetDeviceAttribute("DataRate", StringValue("5Mbps"));
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pointToPoint.SetChannelAttribute("Delay", StringValue("2ms"));
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NetDeviceContainer devices;
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devices = pointToPoint.Install(nodes);
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Ptr<RateErrorModel> em = CreateObject<RateErrorModel>();
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em->SetAttribute("ErrorRate", DoubleValue(0.00001));
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devices.Get(1)->SetAttribute("ReceiveErrorModel", PointerValue(em));
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InternetStackHelper stack;
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stack.Install(nodes);
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Ipv4AddressHelper address;
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address.SetBase("10.1.1.0", "255.255.255.252");
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Ipv4InterfaceContainer interfaces = address.Assign(devices);
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uint16_t sinkPort = 8080;
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Address sinkAddress(InetSocketAddress(interfaces.GetAddress(1), sinkPort));
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PacketSinkHelper packetSinkHelper("ns3::TcpSocketFactory",
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InetSocketAddress(Ipv4Address::GetAny(), sinkPort));
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ApplicationContainer sinkApps = packetSinkHelper.Install(nodes.Get(1));
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sinkApps.Start(Seconds(0.));
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sinkApps.Stop(Seconds(20.));
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Ptr<Socket> ns3TcpSocket = Socket::CreateSocket(nodes.Get(0), TcpSocketFactory::GetTypeId());
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ns3TcpSocket->TraceConnectWithoutContext("CongestionWindow", MakeCallback(&CwndChange));
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Ptr<TutorialApp> app = CreateObject<TutorialApp>();
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app->Setup(ns3TcpSocket, sinkAddress, 1040, 1000, DataRate("1Mbps"));
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nodes.Get(0)->AddApplication(app);
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app->SetStartTime(Seconds(1.));
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app->SetStopTime(Seconds(20.));
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devices.Get(1)->TraceConnectWithoutContext("PhyRxDrop", MakeCallback(&RxDrop));
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Simulator::Stop(Seconds(20));
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Simulator::Run();
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Simulator::Destroy();
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return 0;
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}
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