130 lines
5.0 KiB
C++
130 lines
5.0 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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//
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// This is an illustration of how one could use virtualization techniques to
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// allow running applications on virtual machines talking over simulated
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// networks.
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//
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// The actual steps required to configure the virtual machines can be rather
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// involved, so we don't go into that here. Please have a look at one of
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// our HOWTOs on the nsnam wiki for more details about how to get the
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// system confgured. For an example, have a look at "HOWTO Use Linux
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// Containers to set up virtual networks" which uses this code as an
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// example.
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//
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// The configuration you are after is explained in great detail in the
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// HOWTO, but looks like the following:
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//
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// +----------+ +----------+
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// | virtual | | virtual |
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// | Linux | | Linux |
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// | Host | | Host |
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// | | | |
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// | eth0 | | eth0 |
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// +----------+ +----------+
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// | |
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// +----------+ +----------+
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// | Linux | | Linux |
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// | Bridge | | Bridge |
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// +----------+ +----------+
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// | |
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// +------------+ +-------------+
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// | "tap-left" | | "tap-right" |
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// +------------+ +-------------+
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// | n0 n1 |
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// | +--------+ +--------+ |
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// +-------| tap | | tap |-------+
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// | bridge | | bridge |
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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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// | |
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// ===============
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// CSMA LAN
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//
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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/network-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 ("TapCsmaVirtualMachineExample");
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int
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main (int argc, char *argv[])
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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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// We are interacting with the outside, real, world. This means we have to
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// interact in real-time and therefore means we have to use the real-time
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// simulator and take the time to calculate checksums.
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//
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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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// Create two ghost nodes. The first will represent the virtual machine host
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// on the left side of the network; and the second will represent the VM on
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// the right side.
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//
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NodeContainer nodes;
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nodes.Create (2);
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//
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// Use a CsmaHelper to get a CSMA channel created, and the needed net
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// devices installed on both of the nodes. The data rate and delay for the
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// channel can be set through the command-line parser. For example,
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//
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// ./waf --run "tap=csma-virtual-machine --ns3::CsmaChannel::DataRate=10000000"
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//
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CsmaHelper csma;
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NetDeviceContainer devices = csma.Install (nodes);
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//
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// Use the TapBridgeHelper to connect to the pre-configured tap devices for
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// the left side. We go with "UseBridge" mode since the CSMA devices support
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// promiscuous mode and can therefore make it appear that the bridge is
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// extended into ns-3. The install method essentially bridges the specified
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// tap to the specified CSMA device.
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//
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TapBridgeHelper tapBridge;
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tapBridge.SetAttribute ("Mode", StringValue ("UseBridge"));
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tapBridge.SetAttribute ("DeviceName", StringValue ("tap-left"));
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tapBridge.Install (nodes.Get (0), devices.Get (0));
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//
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// Connect the right side tap to the right side CSMA device on the right-side
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// ghost node.
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//
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tapBridge.SetAttribute ("DeviceName", StringValue ("tap-right"));
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tapBridge.Install (nodes.Get (1), devices.Get (1));
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//
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// Run the simulation for ten minutes to give the user time to play around
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//
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Simulator::Stop (Seconds (600.));
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Simulator::Run ();
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Simulator::Destroy ();
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}
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