How to Implement Network Service Discovery in ns3

To implement the network service Discovery (NSD) in ns3 has to encompass to make a network emulation that the nodes were enthusiastically advertise and determine services. This is very useful in numerous scenarios like IoT, mobile ad hoc networks, and other distributed systems. Now we can see the brief procedure to implement the network service discovery in ns3:

Step-by-Step Implementation:

Step 1: Setup ns3 Environment

Make sure ns3 is installed in the system.

Step 2: Include Necessary Modules

Include the necessary ns3 modules in your 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/mobility-module.h”

#include “ns3/udp-echo-helper.h”

Step 3: Create the Simulation Script

1. Setup Nodes and Network:

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“ServiceDiscoveryExample”);

void AdvertiseService (Ptr<Node> node, std::string serviceName, uint16_t port)

{

NS_LOG_UNCOND (“Node ” << node->GetId () << ” advertising service: ” << serviceName << ” on port ” << port);

Ptr<Socket> socket = Socket::CreateSocket (node, UdpSocketFactory::GetTypeId ());

InetSocketAddress remote = InetSocketAddress (Ipv4Address (“255.255.255.255”), port);

socket->SetAllowBroadcast (true);

socket->Connect (remote);

std::ostringstream msg;

msg << “ServiceAdvertisement:” << serviceName << “:” << port;

Ptr<Packet> packet = Create<Packet> ((uint8_t*) msg.str().c_str(), msg.str().length());

socket->Send (packet);

}

void ReceivePacket (Ptr<Socket> socket)

{

Ptr<Packet> packet;

Address from;

while ((packet = socket->RecvFrom (from)))

{

uint8_t* buffer = new uint8_t[packet->GetSize ()];

packet->CopyData (buffer, packet->GetSize ());

std::string msg = std::string ((char*) buffer, packet->GetSize ());

NS_LOG_UNCOND (“Received packet: ” << msg);

delete[] buffer;

}

}

void DiscoverServices (Ptr<Node> node, uint16_t port)

{

NS_LOG_UNCOND (“Node ” << node->GetId () << ” discovering services…”);

Ptr<Socket> socket = Socket::CreateSocket (node, UdpSocketFactory::GetTypeId ());

InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), port);

socket->Bind (local);

socket->SetRecvCallback (MakeCallback (&ReceivePacket));

}

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

{

CommandLine cmd;

cmd.Parse (argc, argv);

// Create nodes

NodeContainer nodes;

nodes.Create (4);

// Create point-to-point links

PointToPointHelper pointToPoint;

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

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);

// Set up mobility

MobilityHelper mobility;

mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);

mobility.Install (nodes);

// Advertise services on nodes

Simulator::Schedule (Seconds (2.0), &AdvertiseService, nodes.Get (0), “ServiceA”, 8080);

Simulator::Schedule (Seconds (2.0), &AdvertiseService, nodes.Get (1), “ServiceB”, 8081);

// Discover services from nodes

Simulator::Schedule (Seconds (4.0), &DiscoverServices, nodes.Get (2), 8080);

Simulator::Schedule (Seconds (4.0), &DiscoverServices, nodes.Get (2), 8081);

Simulator::Stop (Seconds (10.0));

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

Step 4: Run the Simulation

Compile and run your simulation script:

./waf configure

./waf build

./waf –run ServiceDiscoveryExample

Explanation

• Node Creation: Create nodes representing different 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.
• Mobility: Use the MobilityHelper to set static positions for the nodes.
• Service Advertisement: Use the AdvertiseService function to simulate nodes advertising their services using broadcast packets.
• Service Discovery: Use the DiscoverServices function to simulate nodes discovering services by listening for broadcast packets.

Advanced Service Discovery Techniques

1. Multicast Service Discovery:

To reduce network load and scope advertisements using the multicast instead of broadcast for service advertisements

InetSocketAddress remote = InetSocketAddress (Ipv4Address (“224.0.0.1”), port);

1. Service Discovery Protocols:

To execute more sophisticated service discovery protocols like DNS-SD (DNS Service Discovery) or mDNS (Multicast DNS).

// Implement DNS-SD or mDNS logic here

1. Dynamic Service Updates:

Let services to be dynamically updated or removed, and notify other nodes of these changes.

void UpdateService (Ptr<Node> node, std::string serviceName, uint16_t port)

{

// Implement service update logic here

}

void RemoveService (Ptr<Node> node, std::string serviceName, uint16_t port)

{

// Implement service removal logic here

}

1. Service Filtering:

To execute service filtering to permit nodes to determine only the services they are interested in.

void DiscoverFilteredServices (Ptr<Node> node, uint16_t port, std::string serviceNameFilter)

{

NS_LOG_UNCOND (“Node ” << node->GetId () << ” discovering services with filter: ” << serviceNameFilter);

Ptr<Socket> socket = Socket::CreateSocket (node, UdpSocketFactory::GetTypeId ());

InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), port);

socket->Bind (local);

socket->SetRecvCallback (MakeCallback (&ReceivePacket));

// Implement filtering logic in ReceivePacket function

}

Conclusively, we all know and understand the network service discovery has dynamically emulate the nodes in the numerous environment that were executed using ns3 tool and also we offer the more information regarding the network service discovery.

Implementation of Network Service Discovery in ns3program are carried out by us, we guide you how to user this toll for your projects with rending topics.