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How to Implement Network Business Continuity in ns3

To implement network business continuity in ns3, a network environment has to be simulated. It should have the capability to withstand and recover from various types of failures or disruptions. To ensure the network remains operational under adverse conditions by setting up redundant paths, failover mechanisms, and monitoring tools. Below given steps will guide on setting up a basic simulation of network business continuity in ns3.

Step-by-step guide to implement network Business continuity in ns3:

Step 1: Setup ns3 Environment

Make sure ns3 is installed on the system.

Step 2: Include Necessary Modules

Include the necessary ns3 modules in the script:

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#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/ipv4-global-routing-helper.h”

Step 3: Create the Simulation Script

  1. Setup Nodes and Network:

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using namespace ns3;

 

NS_LOG_COMPONENT_DEFINE (“NetworkBusinessContinuityExample”);

 

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

 

// Create nodes

NodeContainer nodes;

nodes.Create (6);

// Create point-to-point links

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices;

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

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

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

devices.Add (pointToPoint.Install (NodeContainer (nodes.Get (3), nodes.Get (4))));

devices.Add (pointToPoint.Install (NodeContainer (nodes.Get (4), nodes.Get (5))));

// Install Internet stack

InternetStackHelper stack;

stack.Install (nodes);

// Assign IP addresses

Ipv4AddressHelper address;

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

Ipv4InterfaceContainer interfaces = address.Assign (devices);

// Set up applications

uint16_t port = 9;  // Discard port (RFC 863)

// Server application on node 5

Address serverAddress (InetSocketAddress (Ipv4Address::GetAny (), port));

PacketSinkHelper packetSinkHelper (“ns3::UdpSocketFactory”, serverAddress);

ApplicationContainer sinkApps = packetSinkHelper.Install (nodes.Get (5));

sinkApps.Start (Seconds (1.0));

sinkApps.Stop (Seconds (20.0));

// Client application on node 0

OnOffHelper onoff (“ns3::UdpSocketFactory”, Address (InetSocketAddress (interfaces.GetAddress (5), port)));

onoff.SetConstantRate (DataRate (“1Mbps”));

ApplicationContainer apps = onoff.Install (nodes.Get (0));

apps.Start (Seconds (2.0));

apps.Stop (Seconds (20.0));

// Enable pcap tracing for packet capture

pointToPoint.EnablePcapAll (“network-business-continuity”);

// Enable ASCII tracing

AsciiTraceHelper ascii;

pointToPoint.EnableAsciiAll (ascii.CreateFileStream (“network-business-continuity.tr”));

// Enable flow monitor

FlowMonitorHelper flowmon;

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

// Schedule a link failure event

Simulator::Schedule (Seconds (10.0), &NetDevice::SetReceiveErrorModel, devices.Get (2), 0);

Simulator::Stop (Seconds (20.0));

Simulator::Run ();

// Print per-flow statistics

monitor->CheckForLostPackets ();

Ptr<Ipv4FlowClassifier>classifier=DynamicCast<Ipv4FlowClassifier> (flowmon.GetClassifier ());

std::map<FlowId, FlowMonitor::FlowStats> stats = monitor->GetFlowStats ();

for (std::map<FlowId, FlowMonitor::FlowStats>::const_iterator i = stats.begin (); i != stats.end (); ++i)

{

Ipv4FlowClassifier::FiveTuple t = classifier->FindFlow (i->first);

std::cout << “Flow ” << i->first << ” (” << t.sourceAddress << ” -> ” << t.destinationAddress << “)\n”;

std::cout << ”  Tx Bytes:   ” << i->second.txBytes << “\n”;

std::cout << ”  Rx Bytes:   ” << i->second.rxBytes << “\n”;

std::cout << ”  Tx Packets: ” << i->second.txPackets << “\n”;

std::cout << ”  Rx Packets: ” << i->second.rxPackets << “\n”;

std::cout << ”  Throughput: ” << i->second.rxBytes * 8.0 / (i->second.timeLastRxPacket.GetSeconds() – i->second.timeFirstTxPacket.GetSeconds()) / 1024 / 1024 << ” Mbps\n”;

}

Simulator::Destroy ();

return 0;

}

Step 4: Run the Simulation

Compile and run your simulation script:

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./waf configure

./waf build

./waf –run NetworkBusinessContinuityExample

Explanation

  • Node Creation: Create nodes representing different devices in the network.
  • Point-to-Point Links: Configure point-to-point links between nodes with specified data rates and delays.
  • Internet Stack: Install the Internet stack on all nodes.
  • IP Configuration: Assign IP addresses to the interfaces.
  • Applications: Use OnOffApplication and PacketSink to simulate traffic between nodes.
  • Pcap Tracing: Enable pcap tracing on the point-to-point links to capture packets.
  • ASCII Tracing: Enable ASCII tracing to capture detailed packet traces in a human-readable format.
  • Flow Monitor: Use the FlowMonitor module to collect and print statistics about the traffic flows.
  • Link Failure Event: Schedule a link failure event to simulate a network disruption and test the network’s ability to recover.

Step 5: Analyze the Results

  1. Open Pcap Files with Wireshark:

Open the generated .pcap files in Wireshark to analyze the captured packets.

  1. Open ASCII Trace File:

Open the generated .tr file in a text editor to view the detailed packet traces.

  1. Analyze Flow Monitor Output:

Review the flow monitor output printed to the console to analyze traffic flow statistics.

Advanced Business Continuity Techniques

  1. Redundant Paths:

Configure redundant paths in the network to ensure alternative routes are available in case of a link failure.

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Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  1. Dynamic Routing Protocols:

Implement dynamic routing protocols like OSPF or BGP to automatically reroute traffic in case of a failure.

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// Example for OSPF

OspfHelper ospf;

ospf.InstallAll ();

  1. Monitoring and Alerts:

Implement monitoring tools to detect failures and send alerts.

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// Example of monitoring tool setup

FlowMonitorHelper flowmon;

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

 

// At the end of the simulation

monitor->SerializeToXmlFile (“business-continuity-flowmon-results.xml”, true, true);

  1. Backup and Restore:

Implement mechanisms for data backup and restore to ensure data integrity during failures.

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// Example: Simulating backup server

// Set up a backup server node and applications similar to the primary server

  1. Failover Mechanisms:

Implement failover mechanisms to automatically switch to backup systems when a failure is detected.

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// Example: Implementing failover using scripting in ns-3

Simulator::Schedule (Seconds (10.0), &FailoverMechanism);

Finally, we all get to know how to implement the network business continuity in ns3, by simulating a network which can handle the various types of failures or disruptions. And here we had configured the redundant paths to ensure alternative routes are available in it.

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