How to Implement Internet Traffic Transforming in ns3

To implement Internet traffic transforming in ns3 includes adopting or transforming network traffic as it passes over definite nodes in the simulation. It is very helpful for different resolves like traffic analysis, applying anonymization techniques. Firewalls or NATs are the behaviour of network middle boxes. This is a step-by-step guide to help you implement Internet traffic transforming in ns3:

Step-by-step Implementation:

Step 1: Set Up ns3 Environment

1. Install ns3: Download and install ns3. For the operating system we follow the installation suitable guide.
2. Familiarize yourself with ns3: Read over the ns3 tutorial to know the elementary concepts and arrangement of ns3 simulations.

Step 2: Define the Network Topology

1. Create a Simple Network: Using ns3 we define a basic network topology. It is contains to creating nodes, setting up channels, and organizing IP addresses. Then we are use a point-to-point topology for simplicity.

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

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

#include “ns3/applications-module.h”

using namespace ns3;

// Custom application to transform traffic

class TrafficTransformApp : public Application {

public:

TrafficTransformApp() {}

virtual ~TrafficTransformApp() {}

void Setup(Address address, uint16_t port) {

m_peerAddress = address;

m_peerPort = port;

}

private:

virtual void StartApplication() {

m_socket = Socket::CreateSocket(GetNode(), TypeId::LookupByName(“ns3::UdpSocketFactory”));

m_socket->Bind();

m_socket->Connect(InetSocketAddress(m_peerAddress, m_peerPort));

// Set up the receive callback

m_socket->SetRecvCallback(MakeCallback(&TrafficTransformApp::ReceivePacket, this));

// Schedule the first packet transmission

Simulator::Schedule(Seconds(1.0), &TrafficTransformApp::SendPacket, this);

}

virtual void StopApplication() {

if (m_socket) {

m_socket->Close();

m_socket = 0;

}

}

void SendPacket() {

std::string message = “Hello, this is a test message!”;

Ptr<Packet> packet = Create<Packet>((uint8_t *)message.c_str(), message.size());

m_socket->Send(packet);

// Schedule the next packet transmission

Simulator::Schedule(Seconds(1.0), &TrafficTransformApp::SendPacket, this);

}

void ReceivePacket(Ptr<Socket> socket) {

Ptr<Packet> packet = socket->Recv();

uint8_t buffer[1024];

packet->CopyData(buffer, packet->GetSize());

std::string receivedMessage((char *)buffer, packet->GetSize());

// Transform the received message (for example, convert to uppercase)

std::transform(receivedMessage.begin(), receivedMessage.end(), receivedMessage.begin(), ::toupper);

std::cout << “Received and transformed message: ” << receivedMessage << std::endl;

// Optionally, you can send the transformed message back

Ptr<Packet> transformedPacket = Create<Packet>((uint8_t *)receivedMessage.c_str(), receivedMessage.size());

m_socket->Send(transformedPacket);

}

Ptr<Socket> m_socket;

Address m_peerAddress;

uint16_t m_peerPort;

};

int main(int argc, char *argv[]) {

NodeContainer nodes;

nodes.Create(3); // Example: 3 nodes (1 client, 1 server, 1 transformer)

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute(“DataRate”, StringValue(“1Gbps”));

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

NetDeviceContainer devices1;

devices1 = pointToPoint.Install(nodes.Get(0), nodes.Get(2)); // Client to Transformer

NetDeviceContainer devices2;

devices2 = pointToPoint.Install(nodes.Get(2), nodes.Get(1)); // Transformer to Server

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

address.SetBase(“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces1 = address.Assign(devices1);

address.SetBase(“10.1.2.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces2 = address.Assign(devices2);

Ipv4GlobalRoutingHelper::PopulateRoutingTables();

uint16_t port = 9;

Ptr<TrafficTransformApp> clientApp = CreateObject<TrafficTransformApp>();

clientApp->Setup(InetSocketAddress(interfaces1.GetAddress(1), port), port);

nodes.Get(0)->AddApplication(clientApp);

clientApp->SetStartTime(Seconds(2.0));

clientApp->SetStopTime(Seconds(10.0));

Ptr<TrafficTransformApp> transformerApp = CreateObject<TrafficTransformApp>();

transformerApp->Setup(InetSocketAddress(interfaces2.GetAddress(1), port), port);

nodes.Get(2)->AddApplication(transformerApp);

transformerApp->SetStartTime(Seconds(1.0));

transformerApp->SetStopTime(Seconds(10.0));

Ptr<TrafficTransformApp> serverApp = CreateObject<TrafficTransformApp>();

serverApp->Setup(InetSocketAddress(Ipv4Address::GetAny(), port), port);

nodes.Get(1)->AddApplication(serverApp);

serverApp->SetStartTime(Seconds(1.0));

serverApp->SetStopTime(Seconds(10.0));

Simulator::Run();

Simulator::Destroy();

return 0;

}

Explanation:

1. Network Topology:
   • This network topology consists of three nodes: a client, a transformer, and a server.
   • The client sends traffic to the transformer, then forwards the transformed move to the server.
2. Traffic Transform App Class:
   • Sending, receiving, and transforming traffic are handled by this ritual application.
   • Setup method sets the application through the peer address and port.
   • StartApplication method sets up the socket connection, schedules the first packet transmission, and sets up the receive call back.
   • SendPacket method sends a message to the peer node.
   • ReceivePacket method obtains a message, transforms it (e.g., converts to uppercase), and optionally sends the changed message back.
3. Main Function:
   • To creates the network topology and installs the TrafficTransformApp proceeding the client, transformer, and server nodes.
   • The messages sends them to the server when the client sends messages to the transformer.

Compile and Run:

1. Compile the Code: Compile the ns3 simulation code using the given command:

g++ -std=c++11 -o ns3-traffic-transform main.cc `pkg-config –cflags –libs ns3-dev`

1. Run the Simulation: Accomplish the compiled program:

./ns3-traffic-transform

This setup proves a simple applications of Internet traffic transforming in ns3. We can expand it for more nodes, complex topologies, and extra transformation functionalities as necessary.

The above setup we are executed about the network topology and Traffic transform app class from Internet traffic transforming using ns3 tool. We are providing to additional details about the Internet Traffic Transforming in ns3. We conduct the implementation of Internet Traffic Transformation using the ns3 tool, providing guidance on how to utilize this tool for your projects focused on trending topics. Additionally, we offer project ideas accompanied by performance analysis.