krabelize/openwrt-random-mac-changer

OpenWrt change MAC adres on any interface

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