How to Begin Implement Route Source Protocol in NS3

To start implementing a Route Source Protocol within NS3 that requires designing a protocol, which finds how routing data initiates and broadcasts via a network. Below is a step-by-step mechanism to get started:

Steps to Begin Implement Route Source Protocol in NS3

Step 1: Understand NS3 Framework

• Make known about NS3’s architecture and how routing protocols are executed.
• Focus on existing routing protocols like AODV (src/aodv), DSR (src/dsr), or OLSR (src/olsr) using NS3.
• Be familiar with the Ipv4RoutingProtocol and Ipv4RoutingTableEntry role to add new routing protocols.

Step 2: Define the Protocol’s Objectives

1. Scope:
   • Describe the project goals of the protocol which is static networks, dynamic networks, or a hybrid configuration.
2. Route Source Logic:
   • Compute the mechanism to initiates and transmit routing data.
   • Select aspects like metrics, sequence numbers, and route originality.
3. Routing Metrics:
   • Delineate the criteria like hop count, latency, or link quality for route selection.

Step 3: Setup NS3 for Development

1. Create a New Directory:
   • Make a new directory for the protocol in src/ for example src/route-source/.
2. Add Necessary Files:
   • route-source-protocol.h and route-source-protocol.cc: Key execution.
   • route-source-helper.h and route-source-helper.cc: Helper class for setting up the protocol at nodes.
3. Update Build System:
   • Vary the wscript file with new protocol in the src/ directory.

Step 4: Implement Key Components

1. Header File (route-source-protocol.h)

Describe the protocol class by receiving from Ipv4RoutingProtocol.

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

#include “ns3/ipv4-address.h”

class RouteSourceProtocol : public ns3::Ipv4RoutingProtocol {

public:

static ns3::TypeId GetTypeId (void);

RouteSourceProtocol ();

virtual ~RouteSourceProtocol ();

// Override Ipv4RoutingProtocol methods

virtual ns3::Ptr<ns3::Ipv4Route> RouteOutput (

ns3::Ptr<const ns3::Packet> packet,

const ns3::Ipv4Header &header,

ns3::Ptr<ns3::NetDevice> oif,

ns3::Socket::SocketErrno &sockerr);

virtual bool RouteInput (

ns3::Ptr<const ns3::Packet> packet,

const ns3::Ipv4Header &header,

ns3::Ptr<const ns3::NetDevice> idev,

ns3::UnicastForwardCallback ucb,

ns3::MulticastForwardCallback mcb,

ns3::LocalDeliverCallback lcb,

ns3::ErrorCallback ecb);

void StartRouteDiscovery (); // Custom method for initiating route discovery

private:

ns3::Ipv4Address m_sourceAddress; // Address of the node originating routes

};

2. Implementation File (route-source-protocol.cc)

• Execute the protocol logic with route discovery and commercial in the implementation file.

#include “route-source-protocol.h”

#include “ns3/log.h”

#include “ns3/ipv4-route.h”

NS_LOG_COMPONENT_DEFINE (“RouteSourceProtocol”);

NS_OBJECT_ENSURE_REGISTERED (RouteSourceProtocol);

ns3::TypeId

RouteSourceProtocol::GetTypeId (void) {

static ns3::TypeId tid = ns3::TypeId (“ns3::RouteSourceProtocol”)

.SetParent<ns3::Ipv4RoutingProtocol> ()

.SetGroupName (“Internet”)

.AddConstructor<RouteSourceProtocol> ();

return tid;

}

RouteSourceProtocol::RouteSourceProtocol () {

NS_LOG_FUNCTION (this);

}

RouteSourceProtocol::~RouteSourceProtocol () {

NS_LOG_FUNCTION (this);

}

ns3::Ptr<ns3::Ipv4Route>

RouteSourceProtocol::RouteOutput (

ns3::Ptr<const ns3::Packet> packet,

const ns3::Ipv4Header &header,

ns3::Ptr<ns3::NetDevice> oif,

ns3::Socket::SocketErrno &sockerr) {

NS_LOG_FUNCTION (this << header);

// Implement logic to create or find a route

return nullptr; // Return route if available

}

bool

RouteSourceProtocol::RouteInput (

ns3::Ptr<const ns3::Packet> packet,

const ns3::Ipv4Header &header,

ns3::Ptr<const ns3::NetDevice> idev,

ns3::UnicastForwardCallback ucb,

ns3::MulticastForwardCallback mcb,

ns3::LocalDeliverCallback lcb,

ns3::ErrorCallback ecb) {

NS_LOG_FUNCTION (this << header);

// Implement logic for handling incoming packets

return false; // Return true if the route is successfully handled

}

void

RouteSourceProtocol::StartRouteDiscovery () {

NS_LOG_FUNCTION (this);

// Logic for originating and broadcasting routing information

}

3. Helper Class

Make a helper class for enabling the installation of the protocol at nodes in NS3.

#include “route-source-protocol.h”

#include “ns3/node.h”

class RouteSourceHelper {

public:

void Install (ns3::Ptr<ns3::Node> node) {

ns3::Ptr<RouteSourceProtocol> protocol = ns3::CreateObject<RouteSourceProtocol> ();

node->AggregateObject (protocol);

}

};

Step 5: Test Your Protocol

1. Simulation Script:
   • Create a simulation script to verify the protocol with nodes and links to leverage a network topology.
   • Integrate the protocol including existing protocols such as AODV or OLSR with Ipv4ListRoutingHelper.

Example:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “route-source-helper.h”

int main () {

ns3::NodeContainer nodes;

nodes.Create (5);

ns3::InternetStackHelper stack;

RouteSourceHelper routeSourceHelper;

for (uint32_t i = 0; i < nodes.GetN (); ++i) {

routeSourceHelper.Install (nodes.Get (i));

}

stack.Install (nodes);

// Add links and simulate traffic

ns3::Simulator::Run ();

ns3::Simulator::Destroy ();

return 0;

}

1. Run the Simulation:

./waf configure

./waf build

./waf –run your-simulation-script

1. Validate:
   • Authenticate protocol behavior with the support of NS3 tracing and logging mechanisms as NS_LOG.
   • Confirm the routing table updates, packet forwarding, and protocol overhead.

Step 6: Extend and Optimize

• Integrate performance parameters such as hop count, delay, or link reliability.
• Execute the periodic updates or event-driven activates.
• Experiment the scalability including large topologies for enhancement.

From this manual, we clearly known regarding the implementation process on how to start and execute the Route Source Protocol using examples within NS3 environment. If you desire advance insights on this subject, we will make available.