How to Begin Implement a Route Access Protocol in NS3

To create a Route Access Protocol in ns3 tool has includes the model a routing devices which establish and handle on how the routes are permits in a network. The execution depends on the detailed protocol’s features; nevertheless it normally has included the encompassing or generating a custom routing protocol class and incorporates the ns3 tool.

Here’s how to implement a Route Access Protocol in ns-3:

Steps to Begin Implement a Route Access Protocol in NS3

1. Understand the Protocol Requirements

• Protocol Goals:
  • Efficiently permits and handle the routes in a network.
  • It assures the reliability, scalability, and low overhead.
  • Enhance the detailed performance of metrices like as throughput, delay, or energy efficiency.
• Common Use Cases:
  • Dynamic route selection in ad hoc or vehicular networks.
  • The route assigns are Hierarchical or centralized.

2. Set Up ns-3 Environment

1. Install ns-3:

git clone https://gitlab.com/nsnam/ns-3-dev.git

cd ns-3-dev

./build.py

1. Verify the installation:

./ns3 run hello-simulator

3. Plan the Network Topology

• Components:
  • Nodes and routers forming a network.
  • The devices for route discovery, maintenance, and permits.
• Topology:
  • The network topology has a fixed or dynamic network structure by connections among the nodes.

4. Implement the Route Access Protocol
5. Create a Custom Routing Protocol

1. Define the Protocol Class:
   • Encompass the Ipv4RoutingProtocol class for apply the protocol logic.
   • Execute the methods for route discover, route collection, and sending.

Example Skeleton:

#include “ns3/ipv4-routing-protocol.h”

#include “ns3/ipv4-route.h”

class RouteAccessProtocol : public ns3::Ipv4RoutingProtocol {

public:

RouteAccessProtocol() {}

virtual ~RouteAccessProtocol() {}

Ptr<Ipv4Route> RouteOutput(Ptr<Packet> packet, const Ipv4Header &header,

Ptr<NetDevice> oif, Socket::SocketErrno &sockerr) override {

// Implement route selection logic

Ptr<Ipv4Route> route = Create<Ipv4Route>();

// Add custom logic for route access

return route;

}

bool RouteInput(Ptr<const Packet> packet, const Ipv4Header &header,

Ptr<const NetDevice> idev, UnicastForwardCallback ucb,

MulticastForwardCallback mcb, LocalDeliverCallback lcb,

ErrorCallback ecb) override {

// Handle incoming packets and access routes

return true;

}

};

1. Manage Routing Tables:
   • It handle the table for save and bring up-to-date routes dynamically.
   • Data structures use like a hash map or connection list for route storage.

1. Integrate the Protocol

1. Create a Helper Class:

class RouteAccessProtocolHelper : public ns3::Ipv4RoutingHelper {

public:

Ptr<Ipv4RoutingProtocol> Create(Ptr<Node> node) const override {

return CreateObject<RouteAccessProtocol>();

}

};

1. Install the Protocol:

RouteAccessProtocolHelper routeAccess;

ns3::InternetStackHelper stack;

stack.SetRoutingHelper(routeAccess);

stack.Install(nodes);

5. Set Up the Simulation
6. Define Nodes

ns3::NodeContainer nodes;

nodes.Create(10);  // Create 10 nodes

1. Set Up Links

ns3::PointToPointHelper p2p;

p2p.SetDeviceAttribute(“DataRate”, ns3::StringValue(“1Gbps”));

p2p.SetChannelAttribute(“Delay”, ns3::StringValue(“2ms”));

ns3::NetDeviceContainer devices;

devices.Add(p2p.Install(nodes.Get(0), nodes.Get(1)));  // Link Node 0 and Node 1

devices.Add(p2p.Install(nodes.Get(1), nodes.Get(2)));  // Link Node 1 and Node 2

1. Assign IP Addresses

ns3::Ipv4AddressHelper address;

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

address.Assign(devices);

6. Generate Traffic

UDP Traffic

// UDP Echo server on Node 2

ns3::UdpEchoServerHelper echoServer(9);

ns3::ApplicationContainer serverApp = echoServer.Install(nodes.Get(2));

serverApp.Start(ns3::Seconds(1.0));

serverApp.Stop(ns3::Seconds(20.0));

// UDP Echo client on Node 0

ns3::UdpEchoClientHelper echoClient(address.Assign(devices.Get(1)).GetAddress(1), 9);

echoClient.SetAttribute(“MaxPackets”, ns3::UintegerValue(10));

echoClient.SetAttribute(“Interval”, ns3::TimeValue(ns3::Seconds(1.0)));

echoClient.SetAttribute(“PacketSize”, ns3::UintegerValue(512));

ns3::ApplicationContainer clientApp = echoClient.Install(nodes.Get(0));

clientApp.Start(ns3::Seconds(2.0));

clientApp.Stop(ns3::Seconds(20.0));

7. Run the Simulation

ns3::Simulator::Run();

ns3::Simulator::Destroy();

8. Analyze Results

Metrics:

• Packet Delivery Ratio (PDR):
  • Calculate the ratio for successfully delivered the packets.
• Route Discovery Time:
  • Amount of duration takes for explore and launch the routes.
• Routing Overhead:
  • Estimate the numbers of control packets are replaced.

Tracing and Visualization:

• Ensure the tracing for packet study. Cap:

ns3::AsciiTraceHelper ascii;

p2p.EnableAsciiAll(ascii.CreateFileStream(“route-access.tr”));

p2p.EnablePcapAll(“route-access”);

• It use tool like NetAnim for envision:

./waf –run “route-access-simulation –vis”

9. Iterate and Enhance

• Advanced Features:
  • Improve the helps for performance of parameter metrices such as hop count, delay, or bandwidth during route selection.
  • Apply the dynamic route maintenance and failover mechanisms.
• Test Scenarios:
  • Establish the node or connection failures for estimate the protocol robustness.
  • Validate by different network sizes and topologies.
• Comparison:
  • For associate the custom protocol’s for performance beside the existing protocols such as AODV or OLSR.

10. Extend ns-3 Source Code

1. Change or encompass the existing protocols in src/routing for sample AODV, DSR.
2. Improve the advanced features for route access and management.
3. Recreate the tool for ns3:

./waf

As we discussed earlier about how the route access protocol will perform in ns3 simulator tool and we help to provide further information about how the route access protocol will adapt in diverse scenarios.