How to Begin Implement Network Event Correlation in NS3

To implement the network event correlation in ns-3 has includes the classifying, evaluating, and correlating of several actions with network. This system is generally used in network observing and troubleshooting systems for identify the design, classify the root causes, or examine the impact of certain activities on the network.

Here’s how to implement network event correlation in ns-3:

Steps to Begin Implement Network Event Correlation in NS3

1. Understand Network Event Correlation

• Event Types:
  • Packet transmission, reception, or drops.
  • Latency variations, traffic, or node failures.
  • Modify the congestion designs or security events.
• Correlation Objective:
  • Classify the designs for instance increased delay leads to packet drops.
  • Trigger actions according to the correlated actions for sample reroute traffic upon link failure.

2. Set Up ns-3 Environment

• Install ns-3 if not already done:

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

cd ns-3-dev

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

./ns3 build

• Verify the setting:

./ns3 run hello-simulator

3. Design Network Topology

• Generate a network topology which involves the nodes are creating an action of interest.
• Example topology:
  • Nodes: Clients and servers are modifying the congestion.
  • Intermediate Devices: Routers or switches logging and forwarding actions.

4. Steps to Implement Network Event Correlation

(a) Create Nodes

• Describe the nodes for clients, servers, and intermediate devices:

NodeContainer clients, servers, routers;

clients.Create(1);

servers.Create(1);

routers.Create(1);

(b) Set Up Network Links

• Use PointToPointHelper to connect nodes:

PointToPointHelper p2p;

p2p.SetDeviceAttribute(“DataRate”, StringValue(“10Mbps”));

p2p.SetChannelAttribute(“Delay”, StringValue(“2ms”));

NetDeviceContainer clientToRouter = p2p.Install(NodeContainer(clients.Get(0), routers.Get(0)));

NetDeviceContainer routerToServer = p2p.Install(NodeContainer(routers.Get(0), servers.Get(0)));

(c) Install Internet Stack

• For all nodes install the Internet stack:

InternetStackHelper stack;

stack.InstallAll();

(d) Assign IP Addresses

• Allocate the IP addresses for devices:

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer clientRouterInterfaces = address.Assign(clientToRouter);

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

Ipv4InterfaceContainer routerServerInterfaces = address.Assign(routerToServer);

5. Attach Event Callbacks

• Use TraceConnect to seizure actions and assign the custom callbacks for correlation.

(a) Packet Transmission and Reception

• Seizure the transmission and reception actions:

void PacketTransmissionCallback(Ptr<const Packet> packet) {

NS_LOG_UNCOND(“Packet transmitted: ” << *packet);

}

void PacketReceptionCallback(Ptr<const Packet> packet) {

NS_LOG_UNCOND(“Packet received: ” << *packet);

}

clientToRouter.Get(0)->TraceConnectWithoutContext(“PhyTxEnd”, MakeCallback(&PacketTransmissionCallback));

routerToServer.Get(1)->TraceConnectWithoutContext(“PhyRxEnd”, MakeCallback(&PacketReceptionCallback));

(b) Packet Drops

• Seizure the stop action for precise node or device:

void PacketDropCallback(Ptr<const Packet> packet) {

NS_LOG_UNCOND(“Packet dropped: ” << *packet);

}

routers.Get(0)->GetObject<Ipv4>()->TraceConnectWithoutContext(“Drop”, MakeCallback(&PacketDropCallback));

(c) Latency or Delay

• Calculate the delay using timestamps:

void DelayMeasurementCallback(Ptr<const Packet> packet) {

Time now = Simulator::Now();

NS_LOG_UNCOND(“Packet delayed: ” << now.GetSeconds() << ” seconds”);

}

routerToServer.Get(1)->TraceConnectWithoutContext(“PhyRxEnd”, MakeCallback(&DelayMeasurementCallback));

6. Correlate Events

• Execute the logic for correlate several actions using distribute the data structures or conditional triggers.

Example: Correlate Packet Drops with Latency

• Use to plot for log packet delays and correlate by stop the actions:

std::map<uint32_t, Time> packetDelays;

void LogPacketDelay(Ptr<const Packet> packet) {

uint32_t id = packet->GetUid();

packetDelays[id] = Simulator::Now();

}

void CorrelateDropWithDelay(Ptr<const Packet> packet) {

uint32_t id = packet->GetUid();

if (packetDelays.find(id) != packetDelays.end()) {

Time delay = Simulator::Now() – packetDelays[id];

NS_LOG_UNCOND(“Packet ” << id << ” dropped after delay: ” << delay.GetSeconds() << ” seconds”);

} else {

NS_LOG_UNCOND(“Packet ” << id << ” dropped with unknown delay.”);

}

}

routers.Get(0)->GetObject<Ipv4>()->TraceConnectWithoutContext(“Drop”, MakeCallback(&CorrelateDropWithDelay));

routerToServer.Get(1)->TraceConnectWithoutContext(“PhyRxEnd”, MakeCallback(&LogPacketDelay));

7. Monitor and Analyze

• Use for complete analysis for correlated metrics like as FlowMonitor:

FlowMonitorHelper flowmon;

Ptr<FlowMonitor> monitor = flowmon.InstallAll();

Simulator::Run();

monitor->SerializeToXmlFile(“correlation-results.xml”, true, true);

8. Complete Example Code

Here is an sample correlating packet stop by latency:

#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”

using namespace ns3;

std::map<uint32_t, Time> packetDelays;

void LogPacketDelay(Ptr<const Packet> packet) {

uint32_t id = packet->GetUid();

packetDelays[id] = Simulator::Now();

NS_LOG_UNCOND(“Packet ” << id << ” logged with delay.”);

}

void CorrelateDropWithDelay(Ptr<const Packet> packet) {

uint32_t id = packet->GetUid();

if (packetDelays.find(id) != packetDelays.end()) {

Time delay = Simulator::Now() – packetDelays[id];

NS_LOG_UNCOND(“Packet ” << id << ” dropped after delay: ” << delay.GetSeconds() << ” seconds”);

} else {

NS_LOG_UNCOND(“Packet ” << id << ” dropped with unknown delay.”);

}

}

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

CommandLine cmd;

cmd.Parse(argc, argv);

// Create nodes

NodeContainer clients, servers, routers;

clients.Create(1);

servers.Create(1);

routers.Create(1);

// Create links

PointToPointHelper p2p;

p2p.SetDeviceAttribute(“DataRate”, StringValue(“10Mbps”));

p2p.SetChannelAttribute(“Delay”, StringValue(“2ms”));

NetDeviceContainer clientToRouter = p2p.Install(NodeContainer(clients.Get(0), routers.Get(0)));

NetDeviceContainer routerToServer = p2p.Install(NodeContainer(routers.Get(0), servers.Get(0)));

// Install Internet stack

InternetStackHelper stack;

stack.InstallAll();

// Assign IP addresses

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer clientRouterInterfaces = address.Assign(clientToRouter);

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

Ipv4InterfaceContainer routerServerInterfaces = address.Assign(routerToServer);

// Attach event callbacks

routerToServer.Get(1)->TraceConnectWithoutContext(“PhyRxEnd”, MakeCallback(&LogPacketDelay));

routers.Get(0)->GetObject<Ipv4>()->TraceConnectWithoutContext(“Drop”, MakeCallback(&CorrelateDropWithDelay));

// Set up applications

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApp = echoServer.Install(servers.Get(0));

serverApp.Start(Seconds(1.0));

serverApp.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(routerServerInterfaces.GetAddress(1), 9);

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

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

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

ApplicationContainer clientApp = echoClient.Install(clients.Get(0));

clientApp.Start(Seconds(2.0));

clientApp.Stop(Seconds(10.0));

// Run simulation

Simulator::Run();

Simulator::Destroy();

return 0;

}

9. Validate and Extend

• Test the actions for correlation using logs or FlowMonitor outcomes.
• Encompass the execution has contain the further complex actions, like as congestion detection or routing failures.

In the end, we learned and understand how the network event correlation will estimated in the ns3 framework. We will give further insights concerning to network event correlation how it works in varied simulation tools.