OpenWrt random MAC changer

This script changes the MAC address on OpenWrt on any specified (v)NIC interface. Change th OUI of the MAC address in line 13 to a legitmate NIC vendor for RFC and IEEE compliancy. The 802.1X authentication server might have a validator in place to check spoofed MAC addresses against the above IEEE database.

Read this blog post for more information.

Install MAC address changer script:

Initialize on startup:

$ chmod +x /etc/init.d/mac-change.sh
$ /etc/init.d/mac-change.sh enable

Verify:

$ /etc/init.d/mac-change.sh enabled && echo on
on

Edit /etc/rc.local to execute on startup in case the init is too slow:

$ vi /etc/rc.local
/etc/init.d/mac-change.sh start
exit 0

Use the logread command to for debugging and troubleshooting the script. More info on init scripts.

Leverage the crontab utilty if you want to change your MAC address every 3 hours:

$ /etc/init.d/cron start

$ /etc/init.d/cron enable

$ crontab -e
* 3 * * * /etc/init.d/mac-change.sh start

Verify:

$ crontab -l
* 3 * * * /etc/init.d/mac-change.sh start

License

Berkeley Software Distribution (BSD)

Author

Jeroen van Kessel | cryptsus.com - we craft cyber security solutions