ARP spoofing in Computer Networks - Mini Project: Build & Apply

Understanding ARP Spoofing

📖 Scenario: You are learning about network security. One common attack is ARP spoofing, where a bad actor tricks devices on a local network by sending false address information.Imagine a small office network where devices communicate using IP and MAC addresses. You want to understand how ARP spoofing works by creating a simple representation of the network's ARP table and simulating an attack.

🎯 Goal: Build a step-by-step model of an ARP table and simulate how an attacker can change entries to redirect traffic.

📋 What You'll Learn

Create a dictionary representing the ARP table with device IPs as keys and MAC addresses as values.

Add a variable to represent the attacker's fake MAC address.

Write code to update the ARP table to simulate the attacker sending false information.

Complete the ARP table to show the effect of the spoofing attack.

💡 Why This Matters

🌍 Real World

Understanding ARP spoofing helps network administrators protect local networks from attackers who try to intercept or redirect traffic.

💼 Career

Network security professionals must recognize ARP spoofing attacks and know how to prevent or mitigate them to keep networks safe.

1

Create the ARP table

Create a dictionary called arp_table with these exact entries: '192.168.1.2': 'AA:BB:CC:DD:EE:01', '192.168.1.3': 'AA:BB:CC:DD:EE:02', and '192.168.1.4': 'AA:BB:CC:DD:EE:03'.

Computer Networks

# Create the ARP table dictionary with IP to MAC mappings
# Your code here

Need a hint?

Use curly braces to create a dictionary. Each key is an IP string, and each value is a MAC address string.

2

Add the attacker's fake MAC address

Create a variable called attacker_mac and set it to the string 'AA:BB:CC:DD:EE:FF' to represent the attacker's fake MAC address.

Computer Networks

arp_table = {
    '192.168.1.2': 'AA:BB:CC:DD:EE:01',
    '192.168.1.3': 'AA:BB:CC:DD:EE:02',
    '192.168.1.4': 'AA:BB:CC:DD:EE:03'
}
# Create the attacker's fake MAC address
# Your code here

Need a hint?

Assign the string directly to the variable attacker_mac.

3

Simulate ARP spoofing attack

Update the arp_table entry for IP '192.168.1.3' to the value of attacker_mac to simulate the attacker sending false ARP information.

Computer Networks

arp_table = {
    '192.168.1.2': 'AA:BB:CC:DD:EE:01',
    '192.168.1.3': 'AA:BB:CC:DD:EE:02',
    '192.168.1.4': 'AA:BB:CC:DD:EE:03'
}
attacker_mac = 'AA:BB:CC:DD:EE:FF'
# Update the ARP table for '192.168.1.3' to attacker_mac
# Your code here

Need a hint?

Use the key '192.168.1.3' to assign the new MAC address in the dictionary.

4

Complete the ARP table after spoofing

Add a new entry to arp_table with key '192.168.1.5' and value attacker_mac to represent the attacker adding a fake device to the network.

Computer Networks

arp_table = {
    '192.168.1.2': 'AA:BB:CC:DD:EE:01',
    '192.168.1.3': 'AA:BB:CC:DD:EE:02',
    '192.168.1.4': 'AA:BB:CC:DD:EE:03'
}
attacker_mac = 'AA:BB:CC:DD:EE:FF'
arp_table['192.168.1.3'] = attacker_mac
# Add a new fake device with IP '192.168.1.5' and MAC attacker_mac
# Your code here

Need a hint?

Use the new IP as the key and assign the attacker's MAC address as the value.