How to Begin Implement a TCP Protocols in NS3

To begin executing TCP protocols using NS3 which needs to leverage their inherit TCP executions for replicating diverse TCP behaviors within a network. NS3 offers many variants of TCP like TCP Tahoe, TCP Reno, TCP NewReno, TCP Cubic, and TCP BBR. These implementations permits to experiment various TCP protocols’ features like congestion control, reliability, and throughput.

In the following, you can see the steps regarding the implementation of TCP protocols using ns3:

Steps to Begin Implement a TCP Protocols in NS3

1. Set Up ns3 Environment

1. Install ns3:
   • We should download and install ns3 on the system.
   • Make sure installation with a simple example script as ./waf –run hello-simulator.
2. Enable Required Modules:
   • Confirm all necessary modules like internet, tcp, point-to-point, and applications are contained.

2. Define Objectives for TCP Implementation

• Evaluate Performance:
  • Experiment the TCP variants in diverse network scenarios.
• Simulate Traffic:
  • Replicate TCP traffic utilising bulk data transfer or echo applications.
• Measure Metrics:
  • Examine the performance parameters such as throughput, latency, congestion control behavior, and fairness.

3. Set Up the Network Topology

1. Create Nodes:
   • Describe the sender and receiver nodes.

NodeContainer nodes;

nodes.Create(2); // Sender and Receiver nodes

1. Establish Links:
   • Mimic wired links with PointToPointHelper.

PointToPointHelper p2p;

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

p2p.SetChannelAttribute(“Delay”, StringValue(“5ms”));

NetDeviceContainer devices = p2p.Install(nodes);

1. Install Network Stack:
   • Integrate the IP internet stack to each node.

InternetStackHelper internet;

internet.Install(nodes);

1. Assign IP Addresses:
   • Allocate inimitable IP addresses to the nodes using Ipv4AddressHelper.

Ipv4AddressHelper ipv4;

ipv4.SetBase(“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces = ipv4.Assign(devices);

4. Select and Configure TCP Protocol

1. Choose TCP Variant:
   • Set up the preferred TCP variant for the simulation.

Config::SetDefault(“ns3::TcpL4Protocol::SocketType”, StringValue(“ns3::TcpNewReno”)); // Example: TCP NewReno

Other TCP options contain:

1. • ns3::TcpTahoe
   • ns3::TcpReno
   • ns3::TcpCubic
   • ns3::TcpBbr
2. Set TCP Parameters (Optional):
   • Modify TCP characteristics like first congestion window or maximum segment size.

Config::SetDefault(“ns3::TcpSocketBase::MaxWindowSize”, UintegerValue(65535));

Config::SetDefault(“ns3::TcpSocketBase::InitialCwnd”, UintegerValue(10));

5. Install Applications

1. Simulate TCP Traffic:
   • Make use of BulkSendApplication for bulk TCP data transfer.

uint16_t port = 9; // Port for server

Address serverAddress(InetSocketAddress(interfaces.GetAddress(1), port));

// Create a PacketSink application on the receiver

PacketSinkHelper sink(“ns3::TcpSocketFactory”, serverAddress);

ApplicationContainer sinkApp = sink.Install(nodes.Get(1)); // Receiver node

sinkApp.Start(Seconds(0.0));

sinkApp.Stop(Seconds(10.0));

// Create a BulkSend application on the sender

BulkSendHelper source(“ns3::TcpSocketFactory”, serverAddress);

source.SetAttribute(“MaxBytes”, UintegerValue(0)); // Unlimited data

ApplicationContainer sourceApp = source.Install(nodes.Get(0)); // Sender node

sourceApp.Start(Seconds(1.0));

sourceApp.Stop(Seconds(10.0));

1. Monitor Traffic:
   • Observe the incoming packets on the receiver leveraging PacketSink.

PacketSinkHelper packetSink(“ns3::TcpSocketFactory”, serverAddress);

ApplicationContainer sinkApps = packetSink.Install(nodes.Get(1));

sinkApps.Start(Seconds(0.0));

sinkApps.Stop(Seconds(10.0));

6. Simulate and Monitor Congestion

1. Create Congestion:
   • Integrate a blockage connection or more flows for replicating congestion.

p2p.SetDeviceAttribute(“DataRate”, StringValue(“1Mbps”)); // Bottleneck link

1. Observe Congestion Behavior:
   • Observe the response of TCP to packet loss or queue drops to utilize tracing or PCAP files.

7. Enable Tracing and Logging

1. Enable PCAP:
   • Seize packets to use tools such as Wireshark for in depth analysis.

p2p.EnablePcapAll(“tcp-protocol”);

1. Enable ASCII Tracing:
   • Log packet and all event insights for analysis.

AsciiTraceHelper ascii;

p2p.EnableAsciiAll(ascii.CreateFileStream(“tcp-protocol.tr”));

1. Use FlowMonitor:
   • Accumulate performance indicators like throughput and delay with FlowMonitor.

FlowMonitorHelper flowmon;

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

8. Run the Simulation

1. Start the Simulation:

Simulator::Run();

Simulator::Destroy();

1. Export Results:
   • We must store FlowMonitor outcomes for offline analysis.

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

9. Analyze and Visualize Results

1. Traffic Analysis:
   • Measure the TCP performance parameters with the support of PCAP or FlowMonitor data.
2. NetAnim Visualization:
   • Transfer the simulation for envisioning the TCP flows and congestion behavior using NetAnim.

AnimationInterface anim(“tcp-protocol.xml”);

10. Extend and Optimize

1. Compare TCP Variants:
   • Replicate numerous variants such as Tahoe, Reno, Cubic, and BBR in same scenarios.
2. Dynamic Topologies:
   • Integrate the node mobility or link failures to experiment the flexibility of TCP.
3. Advanced Scenarios:
   • Experiment TCP through wireless links or in combined wired-wireless networks.

Example Use Cases

• Data Center Networks:
  • Assess the performance of TCP performance within high-speed and low-latency environments.
• Wireless Networks:
  • Analyse the behaviour of TCP within lossy wireless networks.
• Congestion Control Research:
  • Equate the TCP congestion control mechanisms in diverse situations.

This procedure has covered the overall demonstration which is essential to know before implementing the TCP Protocols in the network using Ns3 tool. We will offer the additional records of TCP protocols based on your requirements.