238 lines
8.2 KiB
C++
238 lines
8.2 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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// bridge1 The node named bridge1 (node 5 in the nodelist)
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// ------------------ has three CMSA net devices that are bridged
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// CSMA CSMA CSMA together using a BridgeNetDevice.
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// | | |
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// | | | The bridge node talks over three CSMA channels
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// | | |
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// CSMA CSMA CSMA to three other CSMA net devices
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// ---- ---- ----
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// n0 n1 n2 Node two acts as a router and talks to another
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// ---- bridge that connects the remaining nodes.
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// CSMA
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// |
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// n3 n4 |
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// ---- ---- |
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// CSMA CSMA |
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// | | |
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// | | |
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// | | |
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// CSMA CSMA CSMA The node named bridge2 (node 6 in the nodelist)
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// ------------------ has three CMSA net devices that are bridged
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// bridge2 together using a BridgeNetDevice.
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//
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// Or, more abstractly, recognizing that bridge 1 and bridge 2 are nodes
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// with three net devices:
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//
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// n0 n1 (n0 = 10.1.1.2)
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// | | (n1 = 10.1.1.3) Note odd addressing
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// ----------- (n2 = 10.1.1.1)
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// | bridge1 | <- n5
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// -----------
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// |
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// router <- n2
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// |
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// -----------
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// | bridge2 | <- n6
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// ----------- (n2 = 10.1.2.1)
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// | | (n3 = 10.1.2.2)
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// n3 n4 (n4 = 10.1.2.3)
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//
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// So, this example shows two broadcast domains, each interconnected by a bridge
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// with a router node (n2) interconnecting the layer-2 broadcast domains
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//
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// It is meant to mirror somewhat the csma-bridge example but adds another
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// bridged link separated by a router.
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//
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// - CBR/UDP flows from n0 (10.1.1.2) to n1 (10.1.1.3) and from n3 (10.1.2.2) to n0 (10.1.1.3)
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// - DropTail queues
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// - Global static routing
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// - Tracing of queues and packet receptions to file "csma-bridge-one-hop.tr"
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#include <iostream>
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#include <fstream>
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#include "ns3/simulator-module.h"
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#include "ns3/node-module.h"
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#include "ns3/core-module.h"
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#include "ns3/helper-module.h"
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#include "ns3/bridge-module.h"
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE ("CsmaBridgeOneHopExample");
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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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#if 0
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LogComponentEnable ("CsmaBridgeOneHopExample", LOG_LEVEL_INFO);
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#endif
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//
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// Allow the user to override any of the defaults and the above Bind() at
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// run-time, via command-line arguments
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//
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CommandLine cmd;
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cmd.Parse (argc, argv);
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//
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// Explicitly create the nodes required by the topology (shown above).
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//
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NS_LOG_INFO ("Create nodes.");
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Ptr<Node> n0 = CreateObject<Node> ();
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Ptr<Node> n1 = CreateObject<Node> ();
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Ptr<Node> n2 = CreateObject<Node> ();
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Ptr<Node> n3 = CreateObject<Node> ();
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Ptr<Node> n4 = CreateObject<Node> ();
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Ptr<Node> bridge1 = CreateObject<Node> ();
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Ptr<Node> bridge2 = CreateObject<Node> ();
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NS_LOG_INFO ("Build Topology");
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CsmaHelper csma;
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csma.SetChannelAttribute ("DataRate", DataRateValue (5000000));
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csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
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// Create the csma links, from each terminal to the bridge
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// This will create six network devices; we'll keep track separately
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// of the devices on and off the bridge respectively, for later configuration
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NetDeviceContainer topLanDevices;
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NetDeviceContainer topBridgeDevices;
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// It is easier to iterate the nodes in C++ if we put them into a container
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NodeContainer topLan (n2, n0, n1);
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for (int i = 0; i < 3; i++)
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{
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// install a csma channel between the ith toplan node and the bridge node
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NetDeviceContainer link = csma.Install (NodeContainer (topLan.Get (i), bridge1));
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topLanDevices.Add (link.Get (0));
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topBridgeDevices.Add (link.Get (1));
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}
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//
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// Now, Create the bridge netdevice, which will do the packet switching. The
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// bridge lives on the node bridge1 and bridges together the topBridgeDevices
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// which are the three CSMA net devices on the node in the diagram above.
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//
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BridgeHelper bridge;
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bridge.Install (bridge1, topBridgeDevices);
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// Add internet stack to the router nodes
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NodeContainer routerNodes (n0, n1, n2, n3, n4);
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InternetStackHelper internet;
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internet.Install (routerNodes);
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// Repeat for bottom bridged LAN
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NetDeviceContainer bottomLanDevices;
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NetDeviceContainer bottomBridgeDevices;
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NodeContainer bottomLan (n2, n3, n4);
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for (int i = 0; i < 3; i++)
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{
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NetDeviceContainer link = csma.Install (NodeContainer (bottomLan.Get (i), bridge2));
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bottomLanDevices.Add (link.Get (0));
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bottomBridgeDevices.Add (link.Get (1));
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}
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bridge.Install (bridge2, bottomBridgeDevices);
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// We've got the "hardware" in place. Now we need to add IP addresses.
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NS_LOG_INFO ("Assign IP Addresses.");
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Ipv4AddressHelper ipv4;
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ipv4.SetBase ("10.1.1.0", "255.255.255.0");
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ipv4.Assign (topLanDevices);
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ipv4.SetBase ("10.1.2.0", "255.255.255.0");
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ipv4.Assign (bottomLanDevices);
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//
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// Create router nodes, initialize routing database and set up the routing
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// tables in the nodes. We excuse the bridge nodes from having to serve as
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// routers, since they don't even have internet stacks on them.
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//
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Ipv4GlobalRoutingHelper::PopulateRoutingTables ();
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//
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// Create an OnOff application to send UDP datagrams from node zero to node 1.
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//
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NS_LOG_INFO ("Create Applications.");
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uint16_t port = 9; // Discard port (RFC 863)
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OnOffHelper onoff ("ns3::UdpSocketFactory",
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Address (InetSocketAddress (Ipv4Address ("10.1.1.3"), port)));
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onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1)));
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onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0)));
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ApplicationContainer app = onoff.Install (n0);
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// Start the application
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app.Start (Seconds (1.0));
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app.Stop (Seconds (10.0));
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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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Address (InetSocketAddress (Ipv4Address::GetAny (), port)));
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ApplicationContainer sink1 = sink.Install (n1);
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sink1.Start (Seconds (1.0));
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sink1.Stop (Seconds (10.0));
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//
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// Create a similar flow from n3 to n0, starting at time 1.1 seconds
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//
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onoff.SetAttribute ("Remote",
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AddressValue (InetSocketAddress (Ipv4Address ("10.1.1.2"), port)));
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ApplicationContainer app2 = onoff.Install (n3);
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app2.Start (Seconds (1.1));
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app2.Stop (Seconds (10.0));
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ApplicationContainer sink2 = sink.Install (n0);
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sink2.Start (Seconds (1.1));
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sink2.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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// Trace output will be sent to the file "csma-bridge-one-hop.tr"
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//
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NS_LOG_INFO ("Configure Tracing.");
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std::ofstream ascii;
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ascii.open ("csma-bridge-one-hop.tr");
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CsmaHelper::EnableAsciiAll (ascii);
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//
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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-bridge-<nodeId>-<interfaceId>.pcap
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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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//
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CsmaHelper::EnablePcapAll ("csma-bridge-one-hop", false);
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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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