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csma-one-subnet.cc
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
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4  * it under the terms of the GNU General Public License version 2 as
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15  */
16 
17 // Network topology
18 //
19 // n0 n1 n2 n3
20 // | | | |
21 // =================
22 // LAN
23 //
24 // - CBR/UDP flows from n0 to n1 and from n3 to n0
25 // - DropTail queues
26 // - Tracing of queues and packet receptions to file "csma-one-subnet.tr"
27 
28 #include <iostream>
29 #include <fstream>
30 
31 #include "ns3/core-module.h"
32 #include "ns3/network-module.h"
33 #include "ns3/csma-module.h"
34 #include "ns3/applications-module.h"
35 #include "ns3/internet-module.h"
36 
37 using namespace ns3;
38 
39 NS_LOG_COMPONENT_DEFINE ("CsmaOneSubnetExample");
40 
41 int
42 main (int argc, char *argv[])
43 {
44 //
45 // Users may find it convenient to turn on explicit debugging
46 // for selected modules; the below lines suggest how to do this
47 //
48 #if 0
49  LogComponentEnable ("CsmaOneSubnetExample", LOG_LEVEL_INFO);
50 #endif
51 //
52 // Allow the user to override any of the defaults and the above Bind() at
53 // run-time, via command-line arguments
54 //
55  CommandLine cmd;
56  cmd.Parse (argc, argv);
57 //
58 // Explicitly create the nodes required by the topology (shown above).
59 //
60  NS_LOG_INFO ("Create nodes.");
61  NodeContainer nodes;
62  nodes.Create (4);
63 
64  NS_LOG_INFO ("Build Topology");
65  CsmaHelper csma;
66  csma.SetChannelAttribute ("DataRate", DataRateValue (5000000));
67  csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
68 //
69 // Now fill out the topology by creating the net devices required to connect
70 // the nodes to the channels and hooking them up.
71 //
72  NetDeviceContainer devices = csma.Install (nodes);
73 
74  InternetStackHelper internet;
75  internet.Install (nodes);
76 
77 // We've got the "hardware" in place. Now we need to add IP addresses.
78 //
79  NS_LOG_INFO ("Assign IP Addresses.");
80  Ipv4AddressHelper ipv4;
81  ipv4.SetBase ("10.1.1.0", "255.255.255.0");
82  Ipv4InterfaceContainer interfaces = ipv4.Assign (devices);
83 
84 //
85 // Create an OnOff application to send UDP datagrams from node zero to node 1.
86 //
87  NS_LOG_INFO ("Create Applications.");
88  uint16_t port = 9; // Discard port (RFC 863)
89 
90  OnOffHelper onoff ("ns3::UdpSocketFactory",
91  Address (InetSocketAddress (interfaces.GetAddress (1), port)));
92  onoff.SetConstantRate (DataRate ("500kb/s"));
93 
94  ApplicationContainer app = onoff.Install (nodes.Get (0));
95  // Start the application
96  app.Start (Seconds (1.0));
97  app.Stop (Seconds (10.0));
98 
99  // Create an optional packet sink to receive these packets
100  PacketSinkHelper sink ("ns3::UdpSocketFactory",
101  Address (InetSocketAddress (Ipv4Address::GetAny (), port)));
102  app = sink.Install (nodes.Get (1));
103  app.Start (Seconds (0.0));
104 
105 //
106 // Create a similar flow from n3 to n0, starting at time 1.1 seconds
107 //
108  onoff.SetAttribute ("Remote",
109  AddressValue (InetSocketAddress (interfaces.GetAddress (0), port)));
110  app = onoff.Install (nodes.Get (3));
111  app.Start (Seconds (1.1));
112  app.Stop (Seconds (10.0));
113 
114  app = sink.Install (nodes.Get (0));
115  app.Start (Seconds (0.0));
116 
117  NS_LOG_INFO ("Configure Tracing.");
118 //
119 // Configure ascii tracing of all enqueue, dequeue, and NetDevice receive
120 // events on all devices. Trace output will be sent to the file
121 // "csma-one-subnet.tr"
122 //
123  AsciiTraceHelper ascii;
124  csma.EnableAsciiAll (ascii.CreateFileStream ("csma-one-subnet.tr"));
125 
126 //
127 // Also configure some tcpdump traces; each interface will be traced.
128 // The output files will be named:
129 //
130 // csma-one-subnet-<node ID>-<device's interface index>.pcap
131 //
132 // and can be read by the "tcpdump -r" command (use "-tt" option to
133 // display timestamps correctly)
134 //
135  csma.EnablePcapAll ("csma-one-subnet", false);
136 //
137 // Now, do the actual simulation.
138 //
139  NS_LOG_INFO ("Run Simulation.");
140  Simulator::Run ();
141  Simulator::Destroy ();
142  NS_LOG_INFO ("Done.");
143 }