How to Implement Network Access Control in ns3

To implement the network access control (NAC) in ns3 encompasses setting up mechanisms to monitor and control network access founded on predefined security policies. Just give us all your info, and we’ll hook you up with the best project support  and implementation around!

The following complete items on how to execute a simple network access control system in the ns3.

Step-by-Step Implementations:

Step 1: Set Up ns3 Environment

1. Install ns3: To install and download ns3. For the operating system we follow the proper installation guide.
2. Familiarize yourself with ns3: To understand the elementary ideas and structure of ns3 simulations to read over the ns3 tutorial.

Step 2: Define the Network Topology

1. Create a Simple Network: By using ns3 to explain a basic network topology. It is includes to making nodes, setting up channels, and forming IP addresses.

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

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

using namespace ns3;

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

NodeContainer nodes;

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

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute(“DataRate”, StringValue(“5Mbps”));

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

NetDeviceContainer devices;

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);

Simulator::Run();

Simulator::Destroy();

return 0;

}

Step 3: Implement Access Control Mechanism

1. Create Access Control Application: To apply contact control policies for develop an application or module. It is founded on MAC addresses, IP addresses, or other criteria.

class AccessControlApp : public Application {

public:

AccessControlApp() {}

virtual ~AccessControlApp() {}

void SetAccessControlCriteria(std::function<bool(Ptr<const Packet>, Ptr<Ipv4> ipv4)> criteria) {

m_criteria = criteria;

}

private:

virtual void StartApplication() {

// Schedule the first packet inspection

Simulator::Schedule(Seconds(1.0), &AccessControlApp::InspectTraffic, this);

}

virtual void StopApplication() {

// Teardown code

}

void InspectTraffic() {

// Inspect packets for access control

Ptr<Ipv4> ipv4 = GetNode()->GetObject<Ipv4>();

for (uint32_t i = 0; i < ipv4->GetNInterfaces(); ++i) {

for (uint32_t j = 0; j < ipv4->GetNAddresses(i); ++j) {

Ipv4InterfaceAddress addr = ipv4->GetAddress(i, j);

Ptr<Packet> packet = Create<Packet>(1024); // Example packet inspection

if (!m_criteria(packet, ipv4)) {

// Drop or block the packet

}

}

}

// Reschedule the next inspection

Simulator::Schedule(Seconds(1.0), &AccessControlApp::InspectTraffic, this);

}

std::function<bool(Ptr<const Packet>, Ptr<Ipv4> ipv4)> m_criteria;

};

Integrate Access Control Logic: For applying access control to describe the logic. It is founded on IP or MAC addresses, explicit ports, or other norms.

Ptr<AccessControlApp> accessControlApp = CreateObject<AccessControlApp>();

accessControlApp->SetAccessControlCriteria([](Ptr<const Packet> packet, Ptr<Ipv4> ipv4) {

// Define access control logic (e.g., allow or deny based on IP address)

Ipv4Header ipv4Header;

packet->PeekHeader(ipv4Header);

Ipv4Address srcAddress = ipv4Header.GetSource();

Ipv4Address allowedAddress(“10.1.1.1”);

return srcAddress == allowedAddress; // Allow packets from the allowed address

});

 

Ptr<Node> serverNode = nodes.Get(1); // Example: Server node

serverNode->AddApplication(accessControlApp);

Step 4: Simulate Access Control

1. Configure Access Control Application: In the network to impose the policies to attribute the access control application to the relevant nodes.

accessControlApp->SetStartTime(Seconds(2.0));

accessControlApp->SetStopTime(Seconds(10.0));

Simulate Network Traffic: To access the control mechanism to simulate network traffic. If we can to generate applications that produce traffic on various nodes.

// Create a simple traffic generator application

class TrafficGeneratorApp : public Application {

public:

TrafficGeneratorApp() {}

virtual ~TrafficGeneratorApp() {}

private:

virtual void StartApplication() {

Simulator::Schedule(Seconds(1.0), &TrafficGeneratorApp::GenerateTraffic, this);

}

virtual void StopApplication() {}

void GenerateTraffic() {

Ptr<Packet> packet = Create<Packet>(1024); // Example packet

// Simulate traffic generation

// Reschedule traffic generation

Simulator::Schedule(Seconds(1.0), &TrafficGeneratorApp::GenerateTraffic, this);

}

};

Ptr<TrafficGeneratorApp> trafficApp = CreateObject<TrafficGeneratorApp>();

Ptr<Node> clientNode = nodes.Get(0); // Example: Client node

clientNode->AddApplication(trafficApp);

trafficApp->SetStartTime(Seconds(2.0));

trafficApp->SetStopTime(Seconds(10.0));

Step 5: Run the Simulation and Analyze Results

1. Run the Simulation: To observe the behaviour of the access control mechanism and network traffic when run the simulation.

Simulator::Run();

Simulator::Destroy();

Collect Metrics: First to collect the related metrics then to evaluate the performance of the access control system, like the number of blocked packets, allowed packets, also network performance.

Visualize Results: To visualize the simulation results and analyse the effectiveness of the access control mechanism by using tools like Gnuplot or Python’s Matplotlib.

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