Let's Linux | Episode 1 – Scambled Mac Addresses Ubuntu? Really!?!?
Remember when you are using Ubuntu 17.04 there is a great “feature” that causes Ubuntu to scramble the Mac Addresses of your Network Cards. If you don’t want this you will need to disable it.
Below are the steps I used to complete this process, but I can not (and will not) guarantee these steps will work for your environment. Please use the below information at your own risk, and only after creating a backup of your network configuration.
1.) Open a Terminal
2.) sudo nano /etc/NetworkManager/NetworkManager.conf
3.) Add the following to the bottom of the configuration file.
[device]
wifi.scan-rand-mac-address=no
4.) Save the file
5.) Restart your network services or reboot your PC
6.) Verify network connectivity
mac address