How to Begin Implement Simple Network Protocol in NS3

To implement a Simple Network Protocol in NS-3, we will want to pattern and build a custom protocol which performs in network stack, typically has maintain the packet forwarding and routing challenges. This could be a lightweight protocol for learning or investigation.

Here’s a step-by-step guide:

Steps to Begin Implement Simple Network Protocol in NS3

Step 1: Define the Scope of Your Protocol

1. Objectives:
   • What should the protocol do? Examples:
     • Route packets among the nodes.
     • Transmission communication.
     • It is a basic forwarding logic.
2. Features:
   • Packet forwarding or minimal functionality for routing.
   • It handles a simple routing table or uses the predefined logic.
3. Use Case:
   • Investigate the lightweight transmission for minimum network topology.
   • Generate an establishment for learning NS-3’s routing and application model.

Step 2: Set Up NS-3

1. Download and Install NS-3:

git clone https://gitlab.com/nsnam/ns-3-dev.git

cd ns-3-dev

./ns3 configure –enable-examples –enable-tests

./ns3 build

1. Verify Installation: Test the installation by running a sample script:

./ns3 run examples/tutorial/first

Step 3: Plan the Protocol Architecture

1. Core Components:
   • Packet Handling: Express on how packets are forwarding, received, and processed.
   • Routing Logic: It is a basic decision for forwarding to next hop or propagation.
   • Routing Table: (Optional) it handles the table for destinations and next hops.
2. Design Considerations:
   • Use the environment for NS-3’s Application class for an end-to-end protocol or Ipv4RoutingProtocol for routing.
   • Apply the simple message set-up for instance source, destination, and payload.

Step 4: Implement the Protocol

Step 4.1: Define the Protocol Class

Build a class encompassing Application for a basic application-layer protocol or Ipv4RoutingProtocol for a network-layer protocol.

#include “ns3/application.h”

#include “ns3/node.h”

#include “ns3/socket.h”

using namespace ns3;

class SimpleNetworkProtocol : public Application {

public:

static TypeId GetTypeId(void);

SimpleNetworkProtocol();

virtual ~SimpleNetworkProtocol();

void SetDestination(Ipv4Address dest);

void SendMessage(std::string message);

void ReceiveMessage(Ptr<Socket> socket);

private:

virtual void StartApplication() override;

virtual void StopApplication() override;

Ptr<Socket> m_socket;

Ipv4Address m_destination;

uint16_t m_port;

};

Step 4.2: Implement Core Functions

• Initialization:
  • Build and bind a socket.

void SimpleNetworkProtocol::StartApplication() {

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

InetSocketAddress local = InetSocketAddress(Ipv4Address::GetAny(), m_port);

m_socket->Bind(local);

m_socket->SetRecvCallback(MakeCallback(&SimpleNetworkProtocol::ReceiveMessage, this));

}

void SimpleNetworkProtocol::StopApplication() {

if (m_socket) {

m_socket->Close();

}

}

• Send Messages:
  • Execute the function for forwarding the packets to destination.

void SimpleNetworkProtocol::SendMessage(std::string message) {

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

InetSocketAddress remote = InetSocketAddress(m_destination, m_port);

m_socket->SendTo(packet, 0, remote);

}

• Receive Messages:
  • It treats the incoming packets.

void SimpleNetworkProtocol::ReceiveMessage(Ptr<Socket> socket) {

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

std::string message = std::string((char *)packet->PeekData(), packet->GetSize());

std::cout << “Received message: ” << message << std::endl;

}

Step 5: Integrate the Protocol into a Simulation

Generate a network topology and install the protocol on nodes.

Step 5.1: Define the Topology

Use helpers such as PointToPointHelper or CsmaHelper for build a network:

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

NodeContainer nodes;

nodes.Create(2);

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices = pointToPoint.Install(nodes);

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign(devices);

// Install the SimpleNetworkProtocol

Ptr<SimpleNetworkProtocol> sender = CreateObject<SimpleNetworkProtocol>();

sender->SetDestination(interfaces.GetAddress(1));

sender->SetStartTime(Seconds(1.0));

sender->SetStopTime(Seconds(10.0));

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

Ptr<SimpleNetworkProtocol> receiver = CreateObject<SimpleNetworkProtocol>();

receiver->SetStartTime(Seconds(1.0));

receiver->SetStopTime(Seconds(10.0));

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

Simulator::Run();

Simulator::Destroy();

return 0;

}

Step 6: Test and Debug

1. Enable Logging:
   • Use the tool for NS-3’s logging system to debug:

export NS_LOG=”SimpleNetworkProtocol=level_all|prefix_time”

./ns3 run my-simulation

1. Verify Behavior:
   • Conform the messages are correctly forwarding and received.
   • Use to seizure the packets for further study PcapHelper.

Step 7: Extend and Optimize

1. Enhancements:
   • Improve the characteristics such as packet retransmission, routing tables, or explore the dynamic.
   • Apply the custom packet formats by further fields.
2. Optimization:
   • Validate by larger network topologies and increase the traffic loads.
   • Enhance for scalability and efficiency.

We performed a general approach on how to simulate and evaluate the Simple Network Protocol projects employing in the ns3 simulating platform. We will supply another manual to address your queries about this project.