MAC addresses are constant, which makes you easily trackable when you are associated with e.g. a WLAN network.
Enable rand_mac@wlan0.timer to regularily change your MAC address when not connected. Works for Ethernet too!
The chosen MAC address is fully random, meaning, the OUI is randomized too. This might be suspicious to any system monitoring traffic. You can change the OUI to a big manufacturer’s one.
Copy:
rand_mac@.timer -> /etc/systemd/system
rand_mac@.service -> /etc/systemd/system
rand_mac.sh -> /usr/local/bin/rand_mac