Macchanger

Show Vendor Codes

macchanger -l

Generate a Random Address

macchanger -r wlan0

Pretend To Be A Burned In Address

macchanger -rb wlan0

Manually Assign an Address

macchanger -m 11:22:33:44:55:66 wlan0

Revert All Changes

macchanger -p wlan0

NetworkManager Autostart

The e flag will keep the vendor code, and b will pretend to be burned in resulting in random macs every interface up. /etc/NetworkManager/dispatcher.d/pre-up.d/macchanger.sh (bash source code) - auto change mac address

#!/bin/bash
macchanger -eb $1

The script must be executable:

chmod +x /etc/NetworkManager/dispatcher.d/pre-up.d/macchanger.sh

Restart NetworkManager:

rc-service NetworkManager restart