# ARP Spoofing Detection with Snort's ArpSpoof Preprocessor

## Introduction

ARP (Address Resolution Protocol) spoofing is a type of attack that allows an attacker to masquerade as another device on the same subnet by sending forged ARP requests and responses onto the local network. This article will cover how to use Snort's arpspoof preprocessor to detect and prevent this type of attack.

## Understanding ARP Spoofing

ARP is a protocol used for mapping IP addresses (which are routable) with MAC addresses (which are not). When an attacker spoofs ARPs, they can make devices on the network believe that their own MAC address belongs to another device. This allows the attacker to intercept traffic meant for other machines or even masquerade as legitimate systems.

## Configuring Snort's ArpSpoof Preprocessor

To enable ARP spoofing detection with Snort using arpspoof, you'll need to first add the following line to your snort.conf file:

```bash

preprocessor arpspoof detect_host:192.168.1.60:00:0C:29:C2:89:83

```

This directive tells Snort to check ARP traffic against a table containing IP addresses `192.168.1.60` and its corresponding MAC address `00:0C:29:C2:89:83`.

## Example Configuration File Excerpt

Here's an example excerpt from your snort.conf file that demonstrates how you might use the arpspoof preprocessor to detect ARP spoofing attacks:

```bash

preprocessor arpspoof detect_host:192.168.1.60:00:0C:29:C2:89:83

```

## In conclusion, by understanding what ARP Spoofing is and how it works, you can effectively use Snort's ArpSpoof preprocessor to protect your network from these types of attacks.

### Related Articles

* 'An Introduction to Network Intrusion Detection with Snort'(https://www.example.com/an-introduction-to-network-intrusion-detection-with-snargh)

* 'Configuring the Suricata IDS for Better Security'(https://www.example.com/configuring-the-suricatidis-for-better-security)

Preprocessor arpspoof_detect_host