How to Start Packet Injection Projects Using OMNeT++

To create a packet injection project using OMNeT++, we will require replicating the network and improve a component which injects the packets such as UDP, TCP, or ICMP packets in the network at particular intervals. This packet can be used for different determination, has contains validate for the network attack replication for sample DoS attacks, or congestion analysis. Below is a step-by-step guide to getting started with packet injection in OMNeT++.

Steps to Start Packet Injection Projects Using OMNeT++

Step 1: Set Up OMNeT++ and INET Framework

  1. Install OMNeT++:
    • Download the OMNeT++ from OMNeT++ official website.
    • Observe the procedures for your operating system such as Windows, Linux, or macOS.
    • We can use OMNeT++ IDE for easier improvement, or we can use many C++ IDE which helps the OMNeT++ projects.
  2. Install INET Framework:
    • The INET Framework is a collection for OMNeT++ which delivers many predefined modules for instance hosts, routers, switches which can be used to the design networks.
    • You can clone the INET repository from GitHub.
    • Monitor the installation procedures we setting the INET for use with OMNeT++.

Step 2: Create the Network Topology

In OMNeT++, we describe the network architecture in a .ned file. The network contains the nodes for sample hosts, routers and link among them.

  1. Create a simple network: Let’s state the simple network in which we will inject the packets from one host to next host.

Example topology.ned file:

network PacketInjectionNetwork

{

submodules:

host1: EthernetHost;

host2: EthernetHost;

router: Router;

connections:

host1.ethg++ <–> EthernetInterface <–> router.ethg++;

host2.ethg++ <–> EthernetInterface <–> router.ethg++;

}

    • The host1 and host2 are two hosts which will communicate by every other via the router.
    • Every host is joined to the router through an Ethernet interface.

Step 3: Implement the Packet Injection Module

We built a need to modify the OMNeT++ components which replicates the packet injection. This module will create a packets such as UDP, TCP and inject in the network.

  1. Define the Packet Injector Module: In OMNeT++, the components are typically written in C++. For packet injection, we can build a simple cSimpleModule class which create transmit for a packets at a detailed interval.

Example: Create a UDP Packet Injector

Here’s an example of how to inject UDP packets using a custom C++ module:

PacketInjector.cc:

#include <omnetpp.h>

#include <INETDefs.h>

#include <UDPPacket_m.h>

 

class PacketInjector : public cSimpleModule

{

protected:

virtual void initialize() override {

// Create a new UDP packet

UDPPacket *packet = new UDPPacket();

packet->setKind(UDP_C_DATA);

packet->setSrcAddr(“10.0.0.1”);  // Source IP address

packet->setDestAddr(“10.0.0.2”); // Destination IP address

// Set packet size (in bytes)

packet->setByteLength(100);

// Send the packet to the network

send(packet, “out”);

// Schedule the next packet injection

scheduleAt(simTime() + 1.0, new cMessage(“InjectPacket”));

}

virtual void handleMessage(cMessage *msg) override {

// Inject a new packet periodically

if (strcmp(msg->getName(), “InjectPacket”) == 0) {

// Create a new UDP packet

UDPPacket *packet = new UDPPacket();

packet->setKind(UDP_C_DATA);

packet->setSrcAddr(“10.0.0.1”);

packet->setDestAddr(“10.0.0.2”);

packet->setByteLength(100);

// Send the packet

send(packet, “out”);

// Reschedule the packet injection

scheduleAt(simTime() + 1.0, msg);

}

else {

delete msg;

}

}

};

Define_Module(PacketInjector);

Explanation:

    • These components build a UDP packet through source and destination IP addresses, set the size of packet, and forward the network.
    • It injects the packets in each 1 second such as scheduleAt(simTime() + 1.0, msg);.
  2. Define the Module in .ned File: Next apply the PacketInjector components in C++, we essential to state the.ned network file.

Example topology.ned:

network PacketInjectionNetwork

{

submodules:

host1: EthernetHost;

host2: EthernetHost;

router: Router;

packetInjector: PacketInjector;  // The packet injector module

connections:

host1.ethg++ <–> EthernetInterface <–> router.ethg++;

host2.ethg++ <–> EthernetInterface <–> router.ethg++;

packetInjector.out++ <–> host1.ethg++;  // Inject packets into host1

}

Step 4: Enable Packet Capture for Wireshark

We seizure the injected packets and study them in Wireshark, we require to ensure the packet seizure for the network in OMNeT++.

  1. Configure Packet Capture in omnetpp.ini: The file setting such as omnetpp.ini will require that packets should be seizure and in which they must be stored.

Example omnetpp.ini:

*.host1.packetCapture = true

*.host1.pcapFile = “output.pcap”

These will seizure the packets forward through host1 and save them in output.pcap, that can next be research the Wireshark.

Step 5: Run the Simulation

  1. Build the Project:
    • In OMNeT++, make a project to compile the code. Assure there are no errors in this project.
  2. Run the Simulation:
    • Use OMNeT++ IDE or the command line to replicate the process.
    • After the process it the replication, the PacketInjector components will initialize the creating a injecting packets in the network.

Step 6: Analyze the Captured Packets in Wireshark

After the replications have process for seizure the packets in the .pcap file, you can go to the file in Wireshark for study.

  1. Open Wireshark:
    • Go to Wireshark and load the output.pcap file.
  2. Analyze the Packets:
    • We can filter the packets through IP address, protocol type, or packet size to view the injected congestion.
    • For sample, use the Wireshark filter ip.src == 10.0.0.1 to show the packets transmit from host1.

Step 7: Advanced Features and Enhancements

Once you have setting the essential packet injection, we can improve the project in several ways:

  1. Packet Types: Inject the various kinds of packets like as ICMP, TCP, or ARP packets.
    • For sample, use ICMP Echo Requests we replicate the ping attacks.
  2. Inject Malicious Traffic: Replicate the Denial-of-Service (DoS) attacks such as SYN Floods or UDP Floods through injecting a large amount of packets.
  3. Adjust Injection Frequency: Custom the packet injection interval we replicate the spurt into the traffic or to switch the percentage of packet injection.
  4. Simulate Network Conditions: Introduce the packet loss, delay, and congestion into the replication of monitor on how the injected packets effects in a network performance.
  5. Monitor Network Effects: Use tools like as Wireshark or OMNeT++’s built-in statistics gather to examine on how the packet injection impact of throughput, latency, and error rates in the network.

Conclusion

We initialize their packet injection project using OMNeT++, we require to:

  1. Configure the OMNeT++ and the INET framework.
  2. Build a modify components to inject the packets for a network.
  3. Describe the network topology and inject packets form one host to next host.
  4. Seizure the packets in PCAP format for study in a Wireshark.
  5. It process for the replication, studies the injected packets, and extends the replicate project for further complex environment.

With this setup, we can simulate various packet injection environments, observe their effect on network performance, and conduct types of network tests or security studies.

Starting the demonstration, we explain the complete simulation setup that will help you to implement and simulate the packet injection attacks projects using OMNeT++ tool and also we provide the procedures, example snippets and their explanation. In case more queries are needed will use another document for explanation.