191 lines
6.6 KiB
C++
191 lines
6.6 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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// Network topology
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//
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// Lan1
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// ===========
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// | | |
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// n0 n1 n2 n3 n4
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// | | |
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// ===========
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// Lan0
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//
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// - Multicast source is at node n0;
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// - Multicast forwarded by node n2 onto LAN1;
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// - Nodes n0, n1, n2, n3, and n4 receive the multicast frame.
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// - Node n4 listens for the data
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#include <iostream>
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#include <fstream>
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#include "ns3/core-module.h"
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#include "ns3/simulator-module.h"
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#include "ns3/node-module.h"
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#include "ns3/helper-module.h"
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE ("CsmaMulticastExample");
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int
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main (int argc, char *argv[])
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{
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//
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// Users may find it convenient to turn on explicit debugging
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// for selected modules; the below lines suggest how to do this
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//
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// LogComponentEnable ("CsmaMulticastExample", LOG_LEVEL_INFO);
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//
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// Make the random number generators generate reproducible results.
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//
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RandomVariable::UseGlobalSeed (1, 1, 2, 3, 5, 8);
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//
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// Set up default values for the simulation.
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//
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// Select Ethernet II-style encapsulation (no LLC/Snap header)
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Config::SetDefault ("ns3::CsmaNetDevice::EncapsulationMode", StringValue ("IpArp"));
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// Allow the user to override any of the defaults at
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// run-time, via command-line arguments
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CommandLine cmd;
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cmd.Parse (argc, argv);
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NS_LOG_INFO ("Create nodes.");
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NodeContainer c;
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c.Create (5);
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// We will later want two subcontainers of these nodes, for the two LANs
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NodeContainer c0 = NodeContainer (c.Get (0), c.Get (1), c.Get (2));
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NodeContainer c1 = NodeContainer (c.Get (2), c.Get (3), c.Get (4));
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NS_LOG_INFO ("Build Topology.");
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CsmaHelper csma;
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csma.SetChannelParameter ("DataRate", DataRateValue (DataRate (5000000)));
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csma.SetChannelParameter ("Delay", TimeValue (MilliSeconds (2)));
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// We will use these NetDevice containers later, for IP addressing
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NetDeviceContainer nd0 = csma.Install (c0); // First LAN
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NetDeviceContainer nd1 = csma.Install (c1); // Second LAN
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NS_LOG_INFO ("Add IP Stack.");
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InternetStackHelper internet;
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internet.Install (c);
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NS_LOG_INFO ("Assign IP Addresses.");
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Ipv4AddressHelper ipv4Addr;
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ipv4Addr.SetBase ("10.1.1.0", "255.255.255.0");
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ipv4Addr.Assign (nd0);
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ipv4Addr.SetBase ("10.1.2.0", "255.255.255.0");
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ipv4Addr.Assign (nd1);
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NS_LOG_INFO ("Configure multicasting.");
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//
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// Now we can configure multicasting. As described above, the multicast
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// source is at node zero, which we assigned the IP address of 10.1.1.1
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// earlier. We need to define a multicast group to send packets to. This
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// can be any multicast address from 224.0.0.0 through 239.255.255.255
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// (avoiding the reserved routing protocol addresses).
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//
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Ipv4Address multicastSource ("10.1.1.1");
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Ipv4Address multicastGroup ("225.1.2.4");
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// Now, we will set up multicast routing. We need to do three things:
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// 1) Configure a (static) multicast route on node n2
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// 2) Set up a default multicast route on the sender n0
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// 3) Have node n4 join the multicast group
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// We have a helper that can help us with static multicast
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StaticMulticastRouteHelper multicast;
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// 1) Configure a (static) multicast route on node n2 (multicastRouter)
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Ptr<Node> multicastRouter = c.Get (2); // The node in question
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Ptr<NetDevice> inputIf = nd0.Get (2); // The input NetDevice
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NetDeviceContainer outputDevices; // A container of output NetDevices
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outputDevices.Add (nd1.Get (0)); // (we only need one NetDevice here)
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multicast.AddMulticastRoute (multicastRouter, multicastSource,
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multicastGroup, inputIf, outputDevices);
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// 2) Set up a default multicast route on the sender n0
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Ptr<Node> sender = c.Get (0);
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Ptr<NetDevice> senderIf = nd0.Get(0);
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multicast.SetDefaultMulticastRoute (sender, senderIf);
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// 3) Have node n4 join the multicast group
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Ptr<Node> receiver = c.Get (4);
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multicast.JoinMulticastGroup (receiver, multicastSource, multicastGroup);
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//
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// Create an OnOff application to send UDP datagrams from node zero to the
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// multicast group (node four will be listening).
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//
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NS_LOG_INFO ("Create Applications.");
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uint16_t multicastPort = 9; // Discard port (RFC 863)
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// Configure a multicast packet generator that generates a packet
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// every few seconds
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OnOffHelper onoff ("ns3::UdpSocketFactory",
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Address (InetSocketAddress (multicastGroup, multicastPort)));
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onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1)));
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onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0)));
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onoff.SetAttribute ("DataRate", DataRateValue (DataRate ("255b/s")));
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onoff.SetAttribute ("PacketSize", UintegerValue (128));
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ApplicationContainer srcC = onoff.Install (c0.Get (0));
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//
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// Tell the application when to start and stop.
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//
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srcC.Start(Seconds(1.));
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srcC.Stop (Seconds(10.));
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// Create an optional packet sink to receive these packets
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PacketSinkHelper sink ("ns3::UdpSocketFactory",
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InetSocketAddress (Ipv4Address::GetAny(), multicastPort));
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ApplicationContainer sinkC = sink.Install (c1.Get (2)); // Node n4
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// Start the sink
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sinkC.Start (Seconds (1.0));
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sinkC.Stop (Seconds (10.0));
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//
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// Configure tracing of all enqueue, dequeue, and NetDevice receive events.
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NS_LOG_INFO ("Configure Tracing.");
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//
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// Ascii trace output will be sent to the file "csma-multicast.tr"
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//
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std::ofstream ascii;
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ascii.open ("csma-multicast.tr");
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CsmaHelper::EnableAsciiAll (ascii);
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// Also configure some tcpdump traces; each interface will be traced.
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// The output files will be named:
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// csma-multicast.pcap-<nodeId>-<interfaceId>
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// and can be read by the "tcpdump -r" command (use "-tt" option to
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// display timestamps correctly)
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CsmaHelper::EnablePcapAll ("csma-multicast");
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//
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// Now, do the actual simulation.
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//
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NS_LOG_INFO ("Run Simulation.");
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Simulator::Run ();
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Simulator::Destroy ();
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NS_LOG_INFO ("Done.");
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}
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