How to Implement network Namespaces in ns3

To implement network Namespaces in ns3 permits the simulation of numerous logical network inside the same physical network. This is typically used for separating the network traffic, running multiple networks on the same nodes, and learning the complex scenarios. Here, we provide the procedures on how to implement network namespaces in ns3:

Step-by-Step Implementation:

Step 1: Set Up the Simulation Environment

• Make sure ns3 are installed in the computer.

Step 2: Create the Network Topology

• Generate the network topology using ns3 with multiple nodes. For this instance, we will simulate a scenario with two namespaces, each containing a pair of nodes connected by a point-to-point link.

Step 3: Define the Network Namespaces

• Create custom applications to simulate the network namespaces.

Step 4: Write the Script

• Here, we provide the sample script to generate and configure the network namespaces in ns3:

1. Create a New File:
   • Save the following script as network-namespaces.cc in the scratch directory of your ns-3 installation.

#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”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“NetworkNamespacesExample”);

void CreateNamespace(NodeContainer &nodes, std::string baseAddress, uint32_t subnetMask)

{

// Create point-to-point links

PointToPointHelper pointToPoint;

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

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

NetDeviceContainer devices = pointToPoint.Install (nodes);

// Install the Internet stack on the nodes

InternetStackHelper stack;

stack.Install (nodes);

// Assign IP addresses to the devices

Ipv4AddressHelper address;

address.SetBase (baseAddress.c_str(), subnetMask);

address.Assign (devices);

}

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

// Create nodes

NodeContainer nodes1, nodes2;

nodes1.Create (2); // Two nodes in the first namespace

nodes2.Create (2); // Two nodes in the second namespace

// Create namespaces

CreateNamespace(nodes1, “10.1.1.0”, 24);

CreateNamespace(nodes2, “10.1.2.0”, 24);

// Set up applications in the first namespace

uint16_t port1 = 9;

UdpServerHelper server1 (port1);

ApplicationContainer serverApp1 = server1.Install (nodes1.Get (1));

serverApp1.Start (Seconds (1.0));

serverApp1.Stop (Seconds (10.0));

UdpClientHelper client1 (Ipv4Address (“10.1.1.2”), port1);

client1.SetAttribute (“MaxPackets”, UintegerValue (10));

client1.SetAttribute (“Interval”, TimeValue (Seconds (1.0)));

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

ApplicationContainer clientApp1 = client1.Install (nodes1.Get (0));

clientApp1.Start (Seconds (2.0));

clientApp1.Stop (Seconds (10.0));

// Set up applications in the second namespace

uint16_t port2 = 10;

UdpServerHelper server2 (port2);

ApplicationContainer serverApp2 = server2.Install (nodes2.Get (1));

serverApp2.Start (Seconds (1.0));

serverApp2.Stop (Seconds (10.0));

UdpClientHelper client2 (Ipv4Address (“10.1.2.2”), port2);

client2.SetAttribute (“MaxPackets”, UintegerValue (10));

client2.SetAttribute (“Interval”, TimeValue (Seconds (1.0)));

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

ApplicationContainer clientApp2 = client2.Install (nodes2.Get (0));

clientApp2.Start (Seconds (2.0));

clientApp2.Stop (Seconds (10.0));

// Enable packet capturing

PointToPointHelper p2p;

p2p.EnablePcapAll (“network-namespaces”);

// Run simulation

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

Explanation:

1. Create Nodes and Network:
   • Create four nodes, two for each namespace.
2. Create Namespaces:
   • Define a function CreateNamespace to set up point-to-point links, install the Internet stack, and assign IP addresses within a namespace.
   • Use this function to create two namespaces with different IP address ranges.
3. Set Up Applications:
   • Set up a UDP server and client in the first namespace.
   • Set up a UDP server and client in the second namespace.
   • Each client sends packets to its corresponding server within the same namespace.
4. Enable Packet Capturing:
   • Enable packet capturing using EnablePcapAll to capture the packets transmitted over the network.
5. Run the Simulation:
   • Schedule the start and stop times for the applications.
   • Run the simulation and log the results.

Step 4: Compile and Run the Script

1. Save the script as network-namespaces.cc in the scratch directory of your ns-3 installation.
2. Compile the script using the following commands:

./waf configure

./waf build

./waf –run network-namespaces

Step 5: Analyze the Results

After running the simulation, you can analyse the results by looking at the logs and the pcap files generated by the packet capturing to verify the behaviour of the network namespaces.

Finally we provide information about the network Namespaces in ns3 implementation tool and additionally we provide and support all kinds of network Namespaces scenarios.

Our team is currently utilizing the ns3tool to incorporate the code necessary for your project, specifically to support network Namespaces. We possess all the necessary tools and resources to successfully complete your project .Get practical explanation from our developers.