How to Calculate Network Compliance in ns3

To calculate the network compliance in ns3, that encompasses to make sure that network operation follow to predefined policies, standards, or regulations. We need to simulate by set up a network policies and then monitoring and verifying network behaviour against these policies.

Here are the procedures on how to implement in ns3:

Steps to Simulate and Calculate Network Compliance in ns3

1. Set Up the ns3 Environment:
   • Make sure ns3 is installed in the computer and configure it properly.
2. Define the Network Topology:
   • Create a network topology with nodes representing clients, servers, and possibly intermediary nodes like routers or switches.
3. Implement Compliance Policies:
   • Define and implement policies such as traffic filtering, bandwidth limits, or access controls.
4. Install Applications:
   • Install traffic-generating applications on the nodes to simulate network traffic.
5. Monitor and Log Events:
   • Use trace sources or callbacks to monitor and log events such as packet transmissions, receptions, and drops.
6. Analyze Compliance Data:
   • Collect and analyze the logged data to verify compliance with the defined policies.

Example Code

The given below is a sample how to set up a basic ns3 simulation to estimate the network compliance. This instance logs packet transmissions, receptions, and drops, and verifies compliance with a simple policy.

#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/flow-monitor-module.h”

#include “ns3/packet.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“NetworkComplianceExample”);

std::map<uint32_t, uint64_t> packetsSent;

std::map<uint32_t, uint64_t> packetsReceived;

std::map<uint32_t, uint64_t> packetsDropped;

void TxCallback (Ptr<const Packet> packet)

{

uint32_t nodeId = packet->GetUid();

packetsSent[nodeId]++;

}

void RxCallback (Ptr<const Packet> packet)

{

uint32_t nodeId = packet->GetUid();

packetsReceived[nodeId]++;

}

void DropCallback (Ptr<const Packet> packet)

{

uint32_t nodeId = packet->GetUid();

packetsDropped[nodeId]++;

}

void CalculateNetworkCompliance ()

{

NS_LOG_UNCOND (“Network Compliance Report:”);

for (auto it = packetsSent.begin (); it != packetsSent.end (); ++it)

{

uint32_t nodeId = it->first;

uint64_t sent = it->second;

uint64_t received = packetsReceived[nodeId];

uint64_t dropped = packetsDropped[nodeId];

// Check compliance with a simple policy: no packet loss allowed

bool compliant = (dropped == 0);

NS_LOG_UNCOND (“Node ” << nodeId << “: Packets Sent = ” << sent << “, Packets Received = ” << received << “, Packets Dropped = ” << dropped << “, Compliant = ” << (compliant ? “Yes” : “No”));

}

}

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

Time::SetResolution (Time::NS);

// Create nodes

NodeContainer nodes;

nodes.Create (4); // Two clients and two servers

// Create point-to-point links

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices01 = pointToPoint.Install (NodeContainer (nodes.Get (0), nodes.Get (1)));

NetDeviceContainer devices12 = pointToPoint.Install (NodeContainer (nodes.Get (1), nodes.Get (2)));

NetDeviceContainer devices23 = pointToPoint.Install (NodeContainer (nodes.Get (2), nodes.Get (3)));

// Install the internet stack on nodes

InternetStackHelper stack;

stack.Install (nodes);

// Assign IP addresses to the devices

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces01 = address.Assign (devices01);

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

Ipv4InterfaceContainer interfaces12 = address.Assign (devices12);

address.SetBase (“10.1.3.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces23 = address.Assign (devices23);

// Enable routing

Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

// Create UDP server on node 2 and node 3

UdpServerHelper server (9);

ApplicationContainer serverApp1 = server.Install (nodes.Get (2));

ApplicationContainer serverApp2 = server.Install (nodes.Get (3));

serverApp1.Start (Seconds (1.0));

serverApp1.Stop (Seconds (10.0));

serverApp2.Start (Seconds (1.0));

serverApp2.Stop (Seconds (10.0));

// Create UDP client on node 0 and node 1

UdpClientHelper client1 (interfaces12.GetAddress (1), 9);

client1.SetAttribute (“MaxPackets”, UintegerValue (320));

client1.SetAttribute (“Interval”, TimeValue (MilliSeconds (10)));

client1.SetAttribute (“PacketSize”, UintegerValue (1024));

UdpClientHelper client2 (interfaces23.GetAddress (1), 9);

client2.SetAttribute (“MaxPackets”, UintegerValue (320));

client2.SetAttribute (“Interval”, TimeValue (MilliSeconds (10)));

client2.SetAttribute (“PacketSize”, UintegerValue (1024));

ApplicationContainer clientApp1 = client1.Install (nodes.Get (0));

ApplicationContainer clientApp2 = client2.Install (nodes.Get (1));

clientApp1.Start (Seconds (2.0));

clientApp1.Stop (Seconds (10.0));

clientApp2.Start (Seconds (2.0));

clientApp2.Stop (Seconds (10.0));

// Trace packet transmission, reception, and drops

Config::ConnectWithoutContext (“/NodeList/*/ApplicationList/*/$ns3::UdpClient/Tx”, MakeCallback (&TxCallback));

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

Config::ConnectWithoutContext (“/NodeList/*/DeviceList/*/Drop”, MakeCallback (&DropCallback));

// Install flow monitor to capture performance metrics

FlowMonitorHelper flowHelper;

Ptr<FlowMonitor> flowMonitor = flowHelper.InstallAll ();

Simulator::Stop (Seconds (11.0));

Simulator::Run ();

CalculateNetworkCompliance ();

Simulator::Destroy ();

return 0;

}

Explanation

1. Setup: The code sets up a network topology with four nodes: two clients and two servers, connected by point-to-point links.
2. Internet Stack and Routing: The internet stack is installed on all nodes, and global routing is enabled.
3. Applications: UDP servers are installed on the server nodes (nodes 2 and 3), and UDP clients are installed on the client nodes (nodes 0 and 1) to generate traffic.
4. Compliance Policies: The TxCallback, RxCallback, and DropCallback functions are connected to trace packet transmissions, receptions, and drops. These functions update counters for each node.
5. Network Compliance Calculation: The CalculateNetworkCompliance function checks compliance with a simple policy (no packet loss allowed) and logs the results for each node.

Running the Simulation

Compile and run the simulation using the following commands in your ns3 environment:

./waf configure

./waf build

./waf –run your-script-name

Replace your-script-name with the actual name of your script file.

Here we provide how the network compliance will estimated the network behaviour against the policies by using the ns3 implementation tool. Further details regarding to network compliance will also be provided. We analyze network compliance in ns3 and conduct networking assessments. Feel free to provide us with your parameters for optimal results from our team.