The two are not even close to one another and hard to explain by a bit flip in EEPROM. It has been a solid backup system-monitored but otherwise ignored because it just works-the kind of reliability I've come to expect from a Ubuntu machine.Īny ideas on what might have caused this? Could some update have caused this? A hardware issue? If so, how would I find out?ĮDIT: The original MAC address was 00:1a:4d:5e:7e:85 and the new address is aa:4c:ca:15:7e:97. It hasn't moved or had hardware modifications in years. The computer only runs for 20-60 minutes a day and does nothing else.

The Ethernet port is build into the motherboard. At some point eth0 became enp2s0 but I can't imagine why that would have changed the MAC. This computer has been running Ubuntu and getting updated since 16.04. While I know the MAC address can be changed, I didn't think this could happen without asking.

This morning something happened that caused the MAC address to change. I have a computer used for backups that does a wake-on-lan to run backups and then turns off.

Home network mac address changed