227 lines
9.0 KiB
C++
227 lines
9.0 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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// +----------+
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// | external |
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// | Linux |
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// | Host |
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// | |
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// | "mytap" |
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// +----------+
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// | n0 n3 n4
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// | +--------+ +------------+ +------------+
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// +-------| tap | | | | |
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// | bridge | ... | | | |
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// +--------+ +------------+ +------------+
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// | Wifi | | Wifi | P2P |-----| P2P | CSMA |
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// +--------+ +------+-----+ +-----+------+
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// | | ^ |
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// ((*)) ((*)) | |
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// P2P 10.1.2 |
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// ((*)) ((*)) | n5 n6 n7
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// | | | | | |
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// n1 n2 ================
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// Wifi 10.1.1 CSMA LAN 10.1.3
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//
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// The Wifi device on node zero is: 10.1.1.1
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// The Wifi device on node one is: 10.1.1.2
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// The Wifi device on node two is: 10.1.1.3
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// The Wifi device on node three is: 10.1.1.4
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// The P2P device on node three is: 10.1.2.1
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// The P2P device on node four is: 10.1.2.2
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// The CSMA device on node four is: 10.1.3.1
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// The CSMA device on node five is: 10.1.3.2
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// The CSMA device on node six is: 10.1.3.3
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// The CSMA device on node seven is: 10.1.3.4
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//
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// Some simple things to do:
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//
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// 1) Ping one of the simulated nodes on the left side of the topology.
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//
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// ./waf --run tap-wifi-dumbbell&
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// ping 10.1.1.3
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//
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// 2) Configure a route in the linux host and ping once of the nodes on the
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// right, across the point-to-point link. You will see relatively large
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// delays due to CBR background traffic on the point-to-point (see next
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// item).
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//
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// ./waf --run tap-wifi-dumbbell&
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// sudo route add -net 10.1.3.0 netmask 255.255.255.0 dev thetap gw 10.1.1.2
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// ping 10.1.3.4
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//
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// Take a look at the pcap traces and note that the timing reflects the
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// addition of the significant delay and low bandwidth configured on the
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// point-to-point link along with the high traffic.
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//
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// 3) Fiddle with the background CBR traffic across the point-to-point
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// link and watch the ping timing change. The OnOffApplication "DataRate"
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// attribute defaults to 500kb/s and the "PacketSize" Attribute defaults
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// to 512. The point-to-point "DataRate" is set to 512kb/s in the script,
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// so in the default case, the link is pretty full. This should be
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// reflected in large delays seen by ping. You can crank down the CBR
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// traffic data rate and watch the ping timing change dramatically.
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//
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// ./waf --run "tap-wifi-dumbbell --ns3::OnOffApplication::DataRate=100kb/s"&
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// sudo route add -net 10.1.3.0 netmask 255.255.255.0 dev thetap gw 10.1.1.2
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// ping 10.1.3.4
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//
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// 4) Try to run this in UseBridge mode. This allows you to bridge an ns-3
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// simulation to an existing pre-configured bridge. This uses tap devices
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// just for illustration, you can create your own bridge if you want.
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//
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// sudo tunctl -t mytap1
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// sudo ifconfig mytap1 0.0.0.0 promisc up
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// sudo tunctl -t mytap2
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// sudo ifconfig mytap2 0.0.0.0 promisc up
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// sudo brctl addbr mybridge
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// sudo brctl addif mybridge mytap1
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// sudo brctl addif mybridge mytap2
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// sudo ifconfig mybridge 10.1.1.5 netmask 255.255.255.0 up
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// ./waf --run "tap-wifi-dumbbell --mode=UseBridge --tapName=mytap2"&
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// ping 10.1.1.3
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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/wifi-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 ("TapDumbbellExample");
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int
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main (int argc, char *argv[])
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{
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std::string mode = "ConfigureLocal";
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std::string tapName = "thetap";
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CommandLine cmd;
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cmd.AddValue("mode", "Mode setting of TapBridge", mode);
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cmd.AddValue("tapName", "Name of the OS tap device", tapName);
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cmd.Parse (argc, argv);
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GlobalValue::Bind ("SimulatorImplementationType", StringValue ("ns3::RealtimeSimulatorImpl"));
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GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true));
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//
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// The topology has a Wifi network of four nodes on the left side. We'll make
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// node zero the AP and have the other three will be the STAs.
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//
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NodeContainer nodesLeft;
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nodesLeft.Create (4);
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YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();
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YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default ();
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wifiPhy.SetChannel (wifiChannel.Create ());
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Ssid ssid = Ssid ("left");
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WifiHelper wifi = WifiHelper::Default ();
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NqosWifiMacHelper wifiMac = NqosWifiMacHelper::Default ();
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wifi.SetRemoteStationManager ("ns3::ArfWifiManager");
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wifiMac.SetType ("ns3::NqapWifiMac",
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"Ssid", SsidValue (ssid),
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"BeaconGeneration", BooleanValue (true),
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"BeaconInterval", TimeValue (Seconds (2.5)));
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NetDeviceContainer devicesLeft = wifi.Install (wifiPhy, wifiMac, nodesLeft.Get (0));
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wifiMac.SetType ("ns3::NqstaWifiMac",
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"Ssid", SsidValue (ssid),
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"ActiveProbing", BooleanValue (false));
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devicesLeft.Add (wifi.Install (wifiPhy, wifiMac, NodeContainer (nodesLeft.Get (1), nodesLeft.Get (2), nodesLeft.Get (3))));
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MobilityHelper mobility;
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mobility.Install (nodesLeft);
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InternetStackHelper internetLeft;
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internetLeft.Install (nodesLeft);
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Ipv4AddressHelper ipv4Left;
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ipv4Left.SetBase ("10.1.1.0", "255.255.255.0");
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Ipv4InterfaceContainer interfacesLeft = ipv4Left.Assign (devicesLeft);
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TapBridgeHelper tapBridge (interfacesLeft.GetAddress (1));
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tapBridge.SetAttribute ("Mode", StringValue (mode));
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tapBridge.SetAttribute ("DeviceName", StringValue (tapName));
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tapBridge.Install (nodesLeft.Get (0), devicesLeft.Get (0));
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//
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// Now, create the right side.
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//
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NodeContainer nodesRight;
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nodesRight.Create (4);
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CsmaHelper csmaRight;
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csmaRight.SetChannelAttribute ("DataRate", DataRateValue (5000000));
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csmaRight.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
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NetDeviceContainer devicesRight = csmaRight.Install (nodesRight);
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InternetStackHelper internetRight;
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internetRight.Install (nodesRight);
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Ipv4AddressHelper ipv4Right;
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ipv4Right.SetBase ("10.1.3.0", "255.255.255.0");
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Ipv4InterfaceContainer interfacesRight = ipv4Right.Assign (devicesRight);
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//
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// Stick in the point-to-point line between the sides.
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//
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PointToPointHelper p2p;
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p2p.SetDeviceAttribute ("DataRate", StringValue ("512kbps"));
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p2p.SetChannelAttribute ("Delay", StringValue ("10ms"));
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NodeContainer nodes = NodeContainer (nodesLeft.Get(3), nodesRight.Get (0));
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NetDeviceContainer devices = p2p.Install (nodes);
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Ipv4AddressHelper ipv4;
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ipv4.SetBase ("10.1.2.0", "255.255.255.192");
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Ipv4InterfaceContainer interfaces = ipv4.Assign (devices);
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//
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// Simulate some CBR traffic over the point-to-point link
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//
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uint16_t port = 9; // Discard port (RFC 863)
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OnOffHelper onoff ("ns3::UdpSocketFactory", InetSocketAddress (interfaces.GetAddress (1), 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 apps = onoff.Install (nodesLeft.Get (3));
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apps.Start (Seconds (1.0));
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// Create a packet sink to receive these packets
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PacketSinkHelper sink ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), port));
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apps = sink.Install (nodesRight.Get (0));
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apps.Start (Seconds (1.0));
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wifiPhy.EnablePcapAll ("tap-wifi-dumbbell");
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CsmaHelper::EnablePcapAll ("tap-wifi-dumbbell", false);
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Ipv4GlobalRoutingHelper::PopulateRoutingTables ();
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Simulator::Stop (Seconds (60.));
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Simulator::Run ();
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Simulator::Destroy ();
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}
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