/* -*- 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/network-module.h”
#include “ns3/netanim-module.h”
#include “ns3/internet-module.h”
#include “ns3/point-to-point-module.h”
#include “ns3/applications-module.h”
#include “ns3/point-to-point-layout-module.h”
// Network topology (default)
//
using namespace ns3; NS_LOG_COMPONENT_DEFINE (“StarAnimation”);
int
main (int argc, char *argv[])
{
//
// 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 nSpokes = 8;
std::string animFile = “star-animation.xml”;uint8_t useIpv6 = 0;
Ipv6Address ipv6AddressBase = Ipv6Address(“2001::”);
Ipv6Prefix ipv6AddressPrefix = Ipv6Prefix(64);
CommandLine cmd;
cmd.AddValue (“nSpokes”, “Number of spoke nodes to place in the star”, nSpokes);
cmd.AddValue (“animFile”, “File Name for Animation Output”, animFile);
cmd.AddValue (“useIpv6”, “use Ipv6”, useIpv6);
cmd.Parse (argc, argv);
NS_LOG_INFO (“Build star topology.”);PointToPointHelper pointToPoint;
pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“5Mbps”));
pointToPoint.SetChannelAttribute (“Delay”, StringValue (“2ms”));
PointToPointStarHelper star (nSpokes, pointToPoint);
NS_LOG_INFO (“Install internet stack on all nodes.”);InternetStackHelper internet;
star.InstallStack (internet);
NS_LOG_INFO (“Assign IP Addresses.”);if (useIpv6 == 0)
{
star.AssignIpv4Addresses (Ipv4AddressHelper (“10.1.1.0”, “255.255.255.0”));
}
else
{
star.AssignIpv6Addresses (ipv6AddressBase, ipv6AddressPrefix);
}
NS_LOG_INFO (“Create applications.”);
//
// Create a packet sink on the star “hub” to receive packets.
//
uint16_t port = 50000;
Address hubLocalAddress;
if (useIpv6 == 0)
{
hubLocalAddress = InetSocketAddress (Ipv4Address::GetAny (), port);
}
else
{
hubLocalAddress = Inet6SocketAddress (Ipv6Address::GetAny (), port);
}
PacketSinkHelper packetSinkHelper (“ns3::TcpSocketFactory”, hubLocalAddress);
ApplicationContainer hubApp = packetSinkHelper.Install (star.GetHub ());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”, StringValue
(“ns3::ConstantRandomVariable[Constant=1]”));onOffHelper.SetAttribute (“OffTime”, StringValue
(“ns3::ConstantRandomVariable[Constant=0]”));ApplicationContainer spokeApps;
for (uint32_t i = 0; i < star.SpokeCount (); ++i)
{
AddressValue remoteAddress;if (useIpv6 == 0)
{
remoteAddress = AddressValue(InetSocketAddress (star.GetHubIpv4Address (i), port));
}
else
{
remoteAddress = AddressValue(Inet6SocketAddress (star.GetHubIpv6Address (i), port));
}
onOffHelper.SetAttribute (“Remote”, remoteAddress);spokeApps.Add (onOffHelper.Install (star.GetSpokeNode (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.
//
if (useIpv6 == 0)
{
Ipv4GlobalRoutingHelper::PopulateRoutingTables ();
}
// Set the bounding box for animation star.BoundingBox (1, 1, 100, 100);
// Create the animation object and configure for specified output AnimationInterface anim (animFile);
NS_LOG_INFO (“Run Simulation.”);Simulator::Run ();Simulator::Destroy ();NS_LOG_INFO (“Done.”);
return 0;
}
Output:
To Plot the graph consider the following files starnew.txt