How to Implement Routing Interface Protocol in NS2

 

To implement a “Routing Interface Protocol” in NS2 has numerous things that relaying on the context. It is often the routing interface is the points that the routes communicate with diverse networks or routing protocols. If we are looking to execute a protocol that needs to includes the routing interface that needs to include generating a custom protocol that handles on how data is transmitted via different interfaces on a node such as a router in a network. The given below are the procedures to implement the Routing interface protocol in ns2:

Step-by-Step Implementation:

Step 1: Define the Protocol Requirements

Regulate the particular behaviour of the routing interface protocol that want to implement:

  • Interface-Based Routing Decisions: Creation the routing decisions based on the particular interface a packet arrives on or should be sent out from.
  • Multi-Interface Management: Handling multiple network interfaces on a node and prior the suitable one for each packet.
  • Policy Routing: Implementing routing policies according to interfaces, like sending specific kinds of traffic via specific interfaces.

Step 2: Set Up NS2

Make sure NS2 is installed on the system. Validate the installation by running a simple simulation and it supports numerous routing protocols and multi-interface nodes, but custom behaviour will need to execute the own protocol.

Step 3: Implement the Routing Interface Protocol in C++

  1. Create the Routing Interface Protocol Agent Class

The below is the simple structure for implementing a Routing Interface Protocol, in which the routing decisions are made based on the network interface.

#include <agent.h>

#include <packet.h>

#include <trace.h>

#include <address.h>

#include <map>

class RoutingInterfaceAgent : public Agent {

public:

RoutingInterfaceAgent();

void recv(Packet* p, Handler* h);

void routeBasedOnInterface(Packet* p, int incomingInterface);

void forwardPacket(Packet* p, int outgoingInterface);

protected:

std::map<int, int> interfaceRoutingTable_; // Incoming Interface -> Outgoing Interface

std::map<int, std::string> policyTable_; // Interface -> Policy

};

// Constructor

RoutingInterfaceAgent::RoutingInterfaceAgent() : Agent(PT_UDP) {

// Example routing table setup (Incoming Interface -> Outgoing Interface)

interfaceRoutingTable_[1] = 2; // Incoming interface 1 should route through interface 2

interfaceRoutingTable_[2] = 1; // Incoming interface 2 should route through interface 1

}

// Packet reception

void RoutingInterfaceAgent::recv(Packet* p, Handler* h) {

int incomingInterface = hdr_cmn::access(p)->iface(); // Assume interface info is in hdr_cmn

routeBasedOnInterface(p, incomingInterface);

}

// Route packet based on the incoming interface

void RoutingInterfaceAgent::routeBasedOnInterface(Packet* p, int incomingInterface) {

if (interfaceRoutingTable_.find(incomingInterface) != interfaceRoutingTable_.end()) {

int outgoingInterface = interfaceRoutingTable_[incomingInterface];

forwardPacket(p, outgoingInterface);

} else {

// Drop packet if no route is found

drop(p);

}

}

// Forward packet to the specified outgoing interface

void RoutingInterfaceAgent::forwardPacket(Packet* p, int outgoingInterface) {

// Update packet interface info and send it out

hdr_cmn::access(p)->iface() = outgoingInterface;

send(p, 0); // Assuming the correct target is set in the send function

}

  1. Integrate the Protocol into NS2
  1. Modify the Makefile: Add the new RoutingInterfaceAgent class to the NS2 Makefile so that it acquires compiled with the rest of the simulator.
  2. Recompile NS2:

make clean

make

Step 4: Create a Tcl Script to Simulate the Routing Interface Protocol

After the Routing Interface Protocol is executed and compiled, generate a Tcl script to emulate a network using custom protocol.

Example Tcl Script:

# Create a simulator object

set ns [new Simulator]

# Define the topology

set val(chan)   Channel/WiredChannel

set val(ll)     LL

set val(ifq)    Queue/DropTail/PriQueue

set val(ifqlen) 50

set val(stop)   50.0

# Initialize the topology object

set topo [new Topography]

$topo load_flatgrid 500 500

# Create nodes representing routers and hosts

set router1 [$ns node]

set router2 [$ns node]

set host1 [$ns node]

set host2 [$ns node]

# Establish links between routers and hosts

$ns duplex-link $router1 $router2 10Mb 10ms DropTail

$ns duplex-link $router1 $host1 100Mb 1ms DropTail

$ns duplex-link $router2 $host2 100Mb 1ms DropTail

# Attach Routing Interface agents to routers

set riagent1 [new Agent/RoutingInterfaceAgent]

set riagent2 [new Agent/RoutingInterfaceAgent]

$ns attach-agent $router1 $riagent1

$ns attach-agent $router2 $riagent2

# Set up traffic sources and sinks

set udp [new Agent/UDP]

set null [new Agent/Null]

$ns attach-agent $host1 $udp

$ns attach-agent $host2 $null

$ns connect $udp $null

# Start the simulation

$ns at 0.0 “$udp start”

$ns at $val(stop) “stop”

$ns at $val(stop) “exit 0”

proc stop {} {

global ns

$ns flush-trace

exit 0

}

# Run the simulation

$ns run

Step 5: Run the Simulation

  1. Save the Tcl script (routing_interface_protocol.tcl).
  2. Open a terminal and navigate to the directory in which we saved the Tcl script.
  3. Execute the simulation using the following command:

ns routing_interface_protocol.tcl

Step 6: Analyse the Results

  • Use trace files and the network animator (NAM) to evaluate the performance of Routing Interface Protocol that concentrates on how well it transmit packets based on the incoming interface and the configured routing tables.
  • Assess whether the routing decisions support with the defined policies and if the packets are forwarded properly via diverse interfaces.

Additional Considerations

  • Multi-Interface Nodes: Evaluate the protocol with nodes that have multiple interfaces interconnected to diverse networks to make sure the protocol manages the complex routing scenarios.
  • Policy Routing: Extend the protocol to support policy-based routing in which decisions are made relaying on more than just the incoming interface, like traffic type, source, or destination.
  • Scalability: Validate the protocol in larger networks with more interfaces and routes to test the scalability and performance.

The above are the complete step-by-step approach that was undertaken for Routing Interface Protocol in ns2 simulator that has manages the routing communication over the network. More information will also be provided about how the routed interface protocol will be performed in other simulation tools. If you’re looking to implement the Routing Interface Protocol in NS2, check out ns2project.com. We’ve got some awesome thesis ideas and topics to share. We handle all kinds of nodes for your projects, so keep in touch for the best outcomes. Plus, we can help you create a custom protocol—just send us your project details, and we’ll guide you through everything!