lengyijun
12/28/2018 - 8:53 AM
csma-multicast.cc
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* 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
*/
// Network topology
//
// Lan1
// ===========
// | | |
// n0 n1 n2 n3 n4 n5 n6
// | | | | | |
// =========== ===========
// Lan0 Lan2
//
// - Multicast source is at node n0;
// - Multicast forwarded by node n2 onto LAN1;
// - Nodes n0, n1, n2, n3, and n4 n5 n6receive the multicast frame.
// - Node n4 listens for the data
#include <iostream>
#include <fstream>
#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/csma-module.h"
#include "ns3/applications-module.h"
#include "ns3/internet-module.h"
#include "ns3/netanim-module.h"
using namespace ns3;
NS_LOG_COMPONENT_DEFINE ("CsmaMulticastExample");
int
main (int argc, char *argv[])
{
//
// Users may find it convenient to turn on explicit debugging
// for selected modules; the below lines suggest how to do this
//
// LogComponentEnable ("CsmaMulticastExample", LOG_LEVEL_INFO);
//
// Set up default values for the simulation.
//
// Select DIX/Ethernet II-style encapsulation (no LLC/Snap header)
Config::SetDefault ("ns3::CsmaNetDevice::EncapsulationMode", StringValue ("Dix"));
// Allow the user to override any of the defaults at
// run-time, via command-line arguments
CommandLine cmd;
cmd.Parse (argc, argv);
NS_LOG_INFO ("Create nodes.");
NodeContainer c;
c.Create (7);
// We will later want two subcontainers of these nodes, for the two LANs
NodeContainer c0 = NodeContainer (c.Get (0), c.Get (1), c.Get (2));
NodeContainer c1 = NodeContainer (c.Get (2), c.Get (3), c.Get (4));
NodeContainer c2 = NodeContainer (c.Get (4), c.Get (5), c.Get (6));
NS_LOG_INFO ("Build Topology.");
CsmaHelper csma;
csma.SetChannelAttribute ("DataRate", DataRateValue (DataRate (5000000)));
csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
// We will use these NetDevice containers later, for IP addressing
NetDeviceContainer nd0 = csma.Install (c0); // First LAN
NetDeviceContainer nd1 = csma.Install (c1); // Second LAN
NetDeviceContainer nd2 = csma.Install (c2); // Third LAN
NS_LOG_INFO ("Add IP Stack.");
InternetStackHelper internet;
internet.Install (c);
NS_LOG_INFO ("Assign IP Addresses.");
Ipv4AddressHelper ipv4Addr;
ipv4Addr.SetBase ("10.1.1.0", "255.255.255.0");
ipv4Addr.Assign (nd0);
//ipv4Addr.SetBase ("10.1.2.0", "255.255.255.0"); //well this is true,no need to allocate different ip address
ipv4Addr.Assign (nd1);
// ipv4Addr.SetBase ("10.1.3.0", "255.255.255.0"); // but no ip address is not acceptable
ipv4Addr.Assign (nd2);
NS_LOG_INFO ("Configure multicasting.");
//
// Now we can configure multicasting. As described above, the multicast
// source is at node zero, which we assigned the IP address of 10.1.1.1
// earlier. We need to define a multicast group to send packets to. This
// can be any multicast address from 224.0.0.0 through 239.255.255.255
// (avoiding the reserved routing protocol addresses).
//
Ipv4Address multicastSource ("10.1.3.3");
Ipv4Address multicastSource0 ("10.1.1.1");
Ipv4Address multicastGroup ("225.1.2.4");
// Now, we will set up multicast routing. We need to do three things:
// 1) Configure a (static) multicast route on node n2
// 2) Set up a default multicast route on the sender n0
// 3) Have node n4 join the multicast group
// We have a helper that can help us with static multicast
Ipv4StaticRoutingHelper multicast;
// 1) Configure a (static) multicast route on node n2 (multicastRouter)
Ptr<Node> multicastRouter = c.Get (2); // The node in question
Ptr<NetDevice> inputIf = nd1.Get (0); // The input NetDevice
NetDeviceContainer outputDevices; // A container of output NetDevices
outputDevices.Add (nd0.Get (2)); // (we only need one NetDevice here)
multicast.AddMulticastRoute (multicastRouter, multicastSource,
multicastGroup, inputIf, outputDevices);
Ptr<NetDevice> inputIf2= nd0.Get (2); // The input NetDevice
NetDeviceContainer outputDevices2; // A container of output NetDevices
outputDevices2.Add (nd1.Get (0)); // (we only need one NetDevice here)
multicast.AddMulticastRoute (multicastRouter, multicastSource0,
multicastGroup, inputIf2, outputDevices2);
// 2) Set up a default multicast route on the sender n0
Ptr<Node> sender = c.Get (0);
Ptr<NetDevice> senderIf = nd0.Get (0);
multicast.SetDefaultMulticastRoute (sender, senderIf);
sender = c.Get (6);
senderIf = nd2.Get (2);
multicast.SetDefaultMulticastRoute (sender, senderIf);
//===================================================
//some modification here
Ptr<Node> multicastRouter1 = c.Get (4); // The node in question
Ptr<NetDevice> inputIf1 = nd2.Get (0); // The input NetDevice
NetDeviceContainer outputDevices1; // A container of output NetDevices
outputDevices1.Add (nd1.Get (2)); // (we only need one NetDevice here)
multicast.AddMulticastRoute (multicastRouter1, multicastSource,
multicastGroup, inputIf1, outputDevices1);
Ptr<Node> multicastRouter4 = c.Get (4); // The node in question
Ptr<NetDevice> inputIf4 = nd1.Get (2); // The input NetDevice
NetDeviceContainer outputDevices4; // A container of output NetDevices
outputDevices4.Add (nd2.Get (0)); // (we only need one NetDevice here)
multicast.AddMulticastRoute (multicastRouter1, multicastSource0,
multicastGroup, inputIf4, outputDevices4);
//===========================================================
//
// Create an OnOff application to send UDP datagrams from node zero to the
// multicast group (node four will be listening).
//
NS_LOG_INFO ("Create Applications.");
uint16_t multicastPort = 9; // Discard port (RFC 863)
// Configure a multicast packet generator that generates a packet
// every few seconds
OnOffHelper onoff ("ns3::UdpSocketFactory",
Address (InetSocketAddress (multicastGroup, multicastPort)));
onoff.SetConstantRate (DataRate ("255b/s"));
onoff.SetAttribute ("PacketSize", UintegerValue (128));
ApplicationContainer srcC = onoff.Install (c2.Get (2));
//
// Tell the application when to start and stop.
//
srcC.Start (Seconds (1.));
srcC.Stop (Seconds (10.));
// Create an optional packet sink to receive these packets
PacketSinkHelper sink ("ns3::UdpSocketFactory",
InetSocketAddress (Ipv4Address::GetAny (), multicastPort));
ApplicationContainer sinkC = sink.Install (c1.Get (2)); // Node n4
// Start the sink
sinkC.Start (Seconds (1.0));
sinkC.Stop (Seconds (10.0));
NS_LOG_INFO ("Configure Tracing.");
//
// Configure tracing of all enqueue, dequeue, and NetDevice receive events.
// Ascii trace output will be sent to the file "csma-multicast.tr"
//
AsciiTraceHelper ascii;
csma.EnableAsciiAll (ascii.CreateFileStream ("csma-multicast.tr"));
// Also configure some tcpdump traces; each interface will be traced.
// The output files will be named:
// csma-multicast-<nodeId>-<interfaceId>.pcap
// and can be read by the "tcpdump -r" command (use "-tt" option to
// display timestamps correctly)
csma.EnablePcapAll ("csma-multicast", false);
AnimationInterface anim ("multicast.xml");
//
// Now, do the actual simulation.
//
NS_LOG_INFO ("Run Simulation.");
Simulator::Run ();
Simulator::Destroy ();
NS_LOG_INFO ("Done.");
}