How to Implement Network Policy Management in ns3

To implement the Network Policy Management in ns3 has encompasses to describe and implementing the protocols that oversee the features of the network devices, traffic flows, and services and it contains policies for Quality of Service (QoS), access control, traffic shaping, and more. The below are the procedures on how to implement the network policy management in ns3:

Step-by-Step Implementation:

1. Install ns3: Make sure ns3 is installed in the system.
2. Define Network Policies: we need to execute the network policies like such as QoS policies, access control rules, and traffic shaping rules.
3. Set Up Network Topology: Create the network topology in ns3, including nodes, links, and network configurations.
4. Implement Policy Enforcement Logic: Develop the logic to enforce the defined network policies within the ns3 simulation.
5. Test and Validate Policies: Run simulations to test and validate the effectiveness of the implemented policies.

Detailed Implementation

1. Install ns3: Follow the installation.
2. Define Network Policies: For this example, we will define a simple QoS policy that prioritizes certain types of traffic and an access control policy that blocks traffic from specific IP addresses.
3. Set up Network Topology: Create an ns3 script that models your network topology.

#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”

#include “ns3/traffic-control-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE(“NetworkPolicyManagementExample”);

void QoSPolicyCallback(Ptr<const Packet> packet) {

NS_LOG_UNCOND(“QoS Policy Applied to Packet: ” << packet->GetUid());

}

void AccessControlPolicyCallback(Ptr<const Packet> packet, const Address &source) {

Ipv4Address ipv4Source = InetSocketAddress::ConvertFrom(source).GetIpv4();

if (ipv4Source == Ipv4Address(“10.1.1.2”)) {

NS_LOG_UNCOND(“Blocking Packet from Source: ” << ipv4Source);

} else {

NS_LOG_UNCOND(“Allowing Packet from Source: ” << ipv4Source);

}

}

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

CommandLine cmd;

cmd.Parse(argc, argv);

NodeContainer nodes;

nodes.Create(4);

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices;

devices = pointToPoint.Install(nodes.Get(0), nodes.Get(1));

devices.Add(pointToPoint.Install(nodes.Get(1), nodes.Get(2)));

devices.Add(pointToPoint.Install(nodes.Get(2), nodes.Get(3)));

InternetStackHelper stack;

stack.Install(nodes);

Ipv4AddressHelper address;

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

address.Assign(devices);

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(nodes.Get(3));

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(address.GetAddress(3), 9);

echoClient.SetAttribute(“MaxPackets”, UintegerValue(10));

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

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

ApplicationContainer clientApps = echoClient.Install(nodes.Get(0));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

// Set up QoS Policy

Ptr<QueueDisc> qdisc = CreateObject<QueueDisc>();

qdisc->TraceConnectWithoutContext(“Enqueue”, MakeCallback(&QoSPolicyCallback));

// Set up Access Control Policy

Config::ConnectWithoutContext(“/NodeList/*/ApplicationList/*/$ns3::PacketSink/Rx”, MakeCallback(&AccessControlPolicyCallback));

Simulator::Run();

Simulator::Destroy();

return 0;

}

Implement Policy Enforcement Logic: In the above script, we have set up two callbacks: one for enforcing a QoS policy and another for enforcing an access control policy.

• QoS Policy: The QoSPolicyCallback function is called whenever a packet is enqueued, logging a message indicating that the QoS policy has been applied to the packet.
• Access Control Policy: The AccessControlPolicyCallback function checks the source IP address of incoming packets and blocks packets from a specific IP address (10.1.1.2), logging a message accordingly.

Test and Validate Policies: Run the simulation and check the output logs to ensure that the policies are being enforced correctly.

./waf –run NetworkPolicyManagementExample

In this script, we clearly understood the implementation process for manage the network policy that includes to create the network topology then apply the protocols to run the simulation using the ns3 tool. If you need any related information regarding this we provide and support it.

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