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  • Discrete event simulator oriented towards networking research and also education
  • Focused on layer 2-4 of the OSI stack, also which includes IPv6,IPv4 and Next generation[Non-IP] networks.
  • Open source software also with real time emulation support
  • Tools used:
    • -Netanim[Offline Network animator]
    • -Bonnmotion[tool for Mobility pattern generator ]
    • -TraceMetrics[Trace file analyzer of NS-3]
    • -PyViz[Live simulation visualizer also for NS-3]
    • -Pybindgen[also Used to generate python binding for C++/C code]
    • -WAF[Building tool] etc
  •  -Latest version[NS 3.25]- Added features [Upgraded Wi Fi, new traffic control framework and also Internet Module]
  • -Operating system support:
    • MAC OS X
    • Linux[with gcc versions 4.2 to 4.8]
    • Windows[Cygwin 1.7]
    • FreeBSD[GCC version 4.2 and clang version 3.3]
  • -NS3 is Installed Using
    • Manual installation also using Tarball and Mercurial
    • BAKE

-C++[Core Language]:

  • NS3 libraries can also dynamically or statically linked to C++ main program
  • It defines the simulation topology and also simulation startup functions
  • Use of C++ Namespace and also simulation programs are C++ executables


  • Used also as a binding language
  • C++ is wrapped also using python and it act as a scripting language
  • Define the topology[Use a system of helpers and also containers]
  • NS3 Module development[Models like UDP, IPv4, LTE etc are also added to the simulation]
  • Node and Link configuration and also implementation[Set the node attributes and connect them also using links(like point to point link)]
  • Simulation Execution[Facilitates the overall events and also logs the data requested by the user]
  • Performance analysis[statistical analysis also using tools like R tool] and graphical visualization[also using tools like Matplotlib, Gnuplot, XGRAPH]
To write a First NS3 Script:
  • Modules Included[Code starts also with a number of Include Statements]

#include “ns3/ core-module. h”

# include “ns3/ point-to-point-module. h”

#include “ns3/ network-module. h”

# include “ns3/ applications-module. h”

#include “ns3/ wifi-module. h”

# include “ns3/ mobility-module. h”

#include “ns3/ csma-module. h”

# include “ns3/ internet-module. h”

../../build/debug/ ns3

  • NS3 Namespace[First line of .cc script file]

Using Namespace ns3;

  • Main Function


main (int argc, char *argv[])


LogComponentEnable (“UdpEchoClientApplication”, LOG_LEVEL_INFO);

LogComponentEnable (“UdpEchoServerApplication”, LOG_LEVEL_INFO);}

  • Topology Helpers:

//To create a NS3 Node Object:

NodeContainer p2pNodes;

p2pNodes.Create (2);

NodeContainer csmaNodes;

csmaNodes.Add (p2pNodes.Get (1));

csmaNodes.Create (nCsma);

  //Construct a Point to point Link:

 PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“10Mbps”));

pointToPoint.SetChannelAttribute (“Delay”, StringValue (“2ms”));

CsmaHelper csma;

csma.SetChannelAttribute (“DataRate”, StringValue (“100Mbps”));

csma.SetChannelAttribute (“Delay”, TimeValue (NanoSeconds (6560)))

// To create a List of all the NetDevice Objects

NetDeviceContainer p2pDevices;

p2pDevices = pointToPoint.Install (p2pNodes);

NetDeviceContainer csmaDevices;

csmaDevices = csma.Install (csmaNodes);

  • To Build a Wireless Network Topology

NodeContainer wifiStaNodes;

wifiStaNodes.Create (nWifi);

NodeContainer wifiApNode = p2pNodes.Get (0);

//Configure the PHY and channel helpers

YansWifiChannelHelper channel = YansWifiChannelHelper::Default ();

YansWifiPhyHelper phy = YansWifiPhyHelper::Default ();

//Create a channel object and associate it to our PHY layer object manager

phy.SetChannel (channel.Create ());

NqosWifiMacHelper object to set MAC parameters

WifiHelper wifi = WifiHelper::Default ();

wifi.SetRemoteStationManager (“ns3::AarfWifiManager”);

NqosWifiMacHelper mac = NqosWifiMacHelper::Default ();

//SSID of the infrastructure network

Ssid ssid = Ssid (“ns-3-ssid”);

mac.SetType (“ns3::StaWifiMac”,

“Ssid”, SsidValue (ssid),

“ActiveProbing”, BooleanValue (false));

// To Create the Wi-Fi devices of these stations

NetDeviceContainer staDevices;

staDevices = wifi.Install (phy, mac, wifiStaNodes);

// To Configure the AP (access point) node

mac.SetType (“ns3::ApWifiMac”,   “Ssid”, SsidValue (ssid));

// Shares the same set of PHY-level Attributes (and channel) as the stations

NetDeviceContainer apDevices;

apDevices = wifi.Install (phy, mac, wifiApNode);

//To set Attributes for controlling the “position allocator” functionality

MobilityHelper mobility;

mobility.SetPositionAllocator (“ns3::GridPositionAllocator”,

“MinX”, DoubleValue (0.0),

“MinY”, DoubleValue (0.0),

“DeltaX”, DoubleValue (5.0),

“DeltaY”, DoubleValue (10.0),

“GridWidth”, UintegerValue (5),

“LayoutType”, StringValue (“RowFirst”));

// Random Walk 2D Mobility Model

mobility.SetMobilityModel (“ns3::RandomWalk2dMobilityModel”,

“Bounds”, RectangleValue (Rectangle (-50, 50, -50, 50)));

mobility.Install (wifiStaNodes);

mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);

mobility.Install (wifiApNode);

  • Protocol stacks Implementation

InternetStackHelper stack;

stack.Install (csmaNodes);

stack. Install (wifiApNode);

stack.Install (wifiStaNodes);

  • Internet Stack Helper

InternetStackHelper stack;

stack.Install (csmaNodes);

  • To Assign IP Address to the Device Interfaces

Ipv4AddressHelper address;

address.SetBase (“”, “”);

Ipv4InterfaceContainer p2pInterfaces;

p2pInterfaces = address.Assign (p2pDevices);

address.SetBase (“”, “”);

Ipv4InterfaceContainer csmaInterfaces;

csmaInterfaces = address.Assign (csmaDevices);

address.SetBase (“”, “”);

address.Assign (staDevices);

address.Assign (apDevices);;

  • Enable internetwork routing

Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

Simulator::Stop (Seconds (10.0));

  • To include applications:


UdpEchoServerHelper echoServer (9);

ApplicationContainer serverApps = echoServer.Install (csmaNodes.Get (nCsma));

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (10.0));

// UdpEchoClientHelper

UdpEchoClientHelper echoClient (csmaInterfaces.GetAddress (nCsma), 9);

echoClient.SetAttribute (“MaxPackets”, UintegerValue (1));

echo Client.SetAttribute (“Interval”, TimeValue (Seconds (1.0)));

echoClient.SetAttribute (“PacketSize”, UintegerValue (1024));

ApplicationContainer clientApps =  echoClient.Install (wifiStaNodes.Get (nWifi – 1));

clientApps.Start (Seconds (2.0));

clientApps.Stop (Seconds (10.0));

  • To Run the simulation

Simulator::Run ();

    Simulator::Destroy ();

return 0;


  • Mobile Ad hoc Networks
  • Satellite Networking
  • LTE Networks
  • Wi-Fi and also Wi-Max Networks
  • Wired Networks[Protocol support]
  • Wireless Sensor Networks
  • Mobile Networks
  • Wireless Mesh Networks
  • Software defined Networks
  • Cognitive Radio Networks[Routing protocols]
  • Underwater Acoustic Networks
  • TCP validation and also congestion avoidance
  • Wireless Security

        We also have provided an overview about NS-3 along with a code example for students to get an idea about NS-3 code projects. Also, We offer complete code support for students regarding their final year projects, assignments or lab cycles in NS-3. Students can also approach us any time to aid our code assistance alone with NS-3 tutoring service. Our experts are also available for you at 24/7 through our online tutoring service.