/* -*- 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
*
*/
#include "ns3/core-module.h"
#include "ns3/simulator-module.h"
#include "ns3/node-module.h"
#include "ns3/helper-module.h"
#include "ns3/global-route-manager.h"
// Network topology (default)
//
// n2 n3 n4 .
// \ | / .
// \|/ .
// n1--- n0---n5 .
// /|\ .
// / | \ .
// n8 n7 n6 .
//
using namespace ns3;
NS_LOG_COMPONENT_DEFINE ("Star");
int
main (int argc, char *argv[])
{
//
// Make the random number generators generate reproducible results.
//
RandomVariable::UseGlobalSeed (1, 1, 2, 3, 5, 8);
//
// Set up some default values for the simulation.
//
Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (137));
// ??? try and stick 15kb/s into the data rate
Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("14kb/s"));
//
// Default number of nodes in the star. Overridable by command line argument.
//
uint32_t nNodes = 9;
CommandLine cmd;
cmd.AddValue("nNodes", "Number of nodes to place in the star", nNodes);
cmd.Parse (argc, argv);
NS_LOG_INFO ("Create nodes.");
NodeContainer hubNode;
NodeContainer spokeNodes;
hubNode.Create (1);
Ptr<Node> hub = hubNode.Get (0);
spokeNodes.Create (nNodes - 1);
NS_LOG_INFO ("Install internet stack on all nodes.");
InternetStackHelper internet;
internet.Install (NodeContainer (hubNode, spokeNodes));
PointToPointHelper pointToPoint;
pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));
NS_LOG_INFO ("Build star topology.");
NetDeviceContainer hubDevices, spokeDevices;
pointToPoint.InstallStar (hubNode.Get (0), spokeNodes, hubDevices, spokeDevices);
NS_LOG_INFO ("Assign IP Addresses.");
Ipv4AddressHelper address;
//
// Assign IPv4 interfaces and IP addresses to the devices we previously
// created. Keep track of the resulting addresses, one for the addresses
// of the hub node, and one for addresses on the spoke nodes. Despite the
// name of the class, what is visible to clients is really the address.
//
Ipv4InterfaceContainer hubAddresses;
Ipv4InterfaceContainer spokeAddresses;
for(uint32_t i = 0; i < spokeNodes.GetN (); ++i)
{
std::ostringstream subnet;
subnet << "10.1.1." << (i << 2);
NS_LOG_INFO ("Assign IP Addresses for point-to-point subnet " << subnet.str ());
address.SetBase (subnet.str ().c_str (), "255.255.255.252");
hubAddresses.Add (address.Assign (hubDevices.Get (i)));
spokeAddresses.Add (address.Assign (spokeDevices.Get (i)));
}
NS_LOG_INFO ("Create applications.");
//
// Create a packet sink on the star "hub" to receive packets.
//
uint16_t port = 50000;
Address hubLocalAddress (InetSocketAddress (Ipv4Address::GetAny (), port));
PacketSinkHelper packetSinkHelper ("ns3::TcpSocketFactory", hubLocalAddress);
ApplicationContainer hubApp = packetSinkHelper.Install (hubNode);
hubApp.Start (Seconds (1.0));
hubApp.Stop (Seconds (10.0));
//
// Create OnOff applications to send TCP to the hub, one on each spoke node.
//
OnOffHelper onOffHelper ("ns3::TcpSocketFactory", Address ());
onOffHelper.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1)));
onOffHelper.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0)));
ApplicationContainer spokeApps;
for (uint32_t i = 0; i < spokeNodes.GetN (); ++i)
{
AddressValue remoteAddress (InetSocketAddress (hubAddresses.GetAddress (i), port));
onOffHelper.SetAttribute ("Remote", remoteAddress);
spokeApps.Add (onOffHelper.Install (spokeNodes.Get (i)));
}
spokeApps.Start (Seconds (1.0));
spokeApps.Stop (Seconds (10.0));
NS_LOG_INFO ("Enable static global routing.");
//
// Turn on global static routing so we can actually be routed across the star.
//
GlobalRouteManager::PopulateRoutingTables ();
NS_LOG_INFO ("Enable pcap tracing.");
//
// Do pcap tracing on all devices on all nodes.
//
PointToPointHelper::EnablePcapAll ("star");
NS_LOG_INFO ("Run Simulation.");
Simulator::Run ();
Simulator::Destroy ();
NS_LOG_INFO ("Done.");
return 0;
}