Learning Networks with Linux: Address Resolution Protocol (ARP)

Introduction

The Address Resolution Protocol (ARP) is a fundamental component of networking, enabling the communication between devices on a local network. ARP serves as the bridge between the network layer (Layer 3) and the data link layer (Layer 2) in the OSI model by mapping IP addresses to MAC addresses. This process is essential for devices to send data to each other within the same network. Understanding ARP and its implementation in Linux is crucial for network administrators, security professionals, and anyone interested in the inner workings of computer networks.

In this blog, we will explore ARP in depth, covering its basic concepts, how it works, its implementation in Linux, common issues and attacks related to ARP, and practical examples of using ARP commands in Linux. Whether you are a beginner or an experienced network engineer, this guide will help you gain a comprehensive understanding of ARP and how to manage it in a Linux environment.

1. Understanding ARP: The Basics

What is ARP?

The Address Resolution Protocol (ARP) is a protocol used to map an IP address to a physical MAC address in a local network. Every device on a network has both an IP address and a MAC address. The IP…