You've found an unoccupied cubicle with an empty desk and a generic IP Phone. The phone is plugged in and working, so you know the network drop is active. We'll drop our small laptop running Kali here and continue the attack from outside.
First, we've unplugged the IP Phone so that our bad guy can take the port. We're going to clone the MAC address of the IP Phone on our Kali box's Ethernet port. From the perspective of a simple MAC address whitelisting methodology of NAC, this will look like the phone merely rebooted.
I use ifconfig to bring up the interface configuration. In my example, my Ethernet port interface is called eth0 and my wireless interface is called wlan0. I'll ...
