How to Implement Network Buffer Management in ns3

To implement network buffer management in ns3, we need to follow several steps. First, configure the queue disciplines (qdiscs) to manage packet queues in network devices. To manage buffers, various queue disciplines such as FIFO, RED (Random Early Detection), CoDel (Controlled Delay), and more can be used which are provided by ns3. Below given steps will guide on implementing network buffer management in ns3.

Step-by-step guide to implement network buffer management in ns3:

Step 1: Setup ns3 Environment

Make sure ns3 is installed and set up on the system.

Step 2: Include Necessary Modules

Include the necessary ns3 modules in the script:

#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”

Step 3: Create the Simulation Script

1. Setup Nodes and Network

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“NetworkBufferManagement”);

 

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

{

// Enable logging

LogComponentEnable (“UdpEchoClientApplication”, LOG_LEVEL_INFO);

LogComponentEnable (“UdpEchoServerApplication”, LOG_LEVEL_INFO);

// Create nodes

NodeContainer nodes;

nodes.Create (4);

// Create point-to-point links

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices;

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

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

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

// 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);

// Populate routing tables

Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

// Set up queue disciplines

TrafficControlHelper tch;

tch.SetRootQueueDisc (“ns3::RedQueueDisc”);

tch.Install (devices);

// Set up applications

UdpEchoServerHelper echoServer (9);

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

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (20.0));

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

echoClient.SetAttribute (“MaxPackets”, UintegerValue (1000));

echoClient.SetAttribute (“Interval”, TimeValue (Seconds (0.01)));

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

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

clientApps.Start (Seconds (2.0));

clientApps.Stop (Seconds (20.0));

// Flow monitor

FlowMonitorHelper flowmon;

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

Simulator::Stop (Seconds (20.0));

Simulator::Run ();

// Print flow monitor statistics

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

Simulator::Destroy ();

return 0;

}

Step 4: Run the Simulation

Compile and run your simulation script:

./waf configure

./waf build

./waf –run NetworkBufferManagement

Explanation:

• Node Creation: Create nodes representing devices in the network.
• Point-to-Point Links: Configure point-to-point links between nodes.
• Internet Stack: Install the Internet stack on all nodes.
• IP Configuration: Assign IP addresses to the nodes.
• Routing Tables: Populate the global routing tables.
• Queue Disciplines: Configure the root queue discipline to use RED (Random Early Detection). You can change ns3::RedQueueDisc to any other supported qdisc like ns3::PfifoFastQueueDisc, ns3::CoDelQueueDisc, etc.
• Applications: Use UDP Echo server and client applications to simulate data transmission.
• Flow Monitor: Use the flow monitor to collect data on packet loss, delay, throughput, etc.

Advanced Buffer Management Techniques

For more advanced buffer management, you can customize the parameters of the queue disciplines:

1. Customizing RED Parameters:

TrafficControlHelper tch;

tch.SetRootQueueDisc (“ns3::RedQueueDisc”);

 

Config::SetDefault (“ns3::RedQueueDisc::MinTh”, DoubleValue (5.0));

Config::SetDefault (“ns3::RedQueueDisc::MaxTh”, DoubleValue (15.0));

Config::SetDefault (“ns3::RedQueueDisc::QW”, DoubleValue (0.002));

Config::SetDefault (“ns3::RedQueueDisc::LInterm”, DoubleValue (50));

tch.Install (devices);

Using CoDel:

TrafficControlHelper tch;

tch.SetRootQueueDisc (“ns3::CoDelQueueDisc”);

Config::SetDefault (“ns3::CoDelQueueDisc::MaxPackets”, UintegerValue (100));

tch.Install (devices);

Monitoring Queue Disciplines: You can monitor the performance of the queue disciplines using the FlowMonitor and other ns-3 tracing mechanisms.

tch.Install (devices);

AsciiTraceHelper ascii;

pointToPoint.EnableAsciiAll (ascii.CreateFileStream (“queue-disc.tr”));

Here we had clearly discussed about the implementation process of buffer management in ns3 which involves configuring queue disciplines, IP configuration, Routing tables and using UDP applications to simulate data transmission.

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