Has anyone got any idea why the first 2 digits of the mac address keep changing on me? This happens on iPhones, Amazon Echo's, Sonos etc. and across multiple access points.
I don't think I have seen it happen on a non wireless device yet, but I have so few that it might have done and I haven't noticed.
I let the device pick up a dynamic address, and for example, if I want to do presence detection on the phone for home automation, I need to give it a static lease, so I convert the dynamic lease to a static lease, and edit the IP to where I need it to be, effectively giving it a static IP. For example on an iPhone the addess would start 88-E8-7F clearly an Apple device.
Later I'll come back and find the same device has picked up a new dynamic IP address and the mac address is identical, except that where it started with 88-E8-7F before, now if starts 8A-E8-7F. This does not seem to be a registered OUI
I see the same thing with Amazon Echo's Dot's changing from 18-74-2E to 1A-74-2E or Echo Shows from 50-DC-E7 to 52-DC-E7. It seems to consistently add 2 on to the first pair.
I used to use one of my Linux servers for DHCP and didn't have any issues that I'm aware of, but wanted to move the DHCP onto a CRS switch and am now having issues. I use static addresses heavily on wireless devices so that I know where they are for home automation purposes, so I must have them static.
Any idea what this is and how I can stop it?
Thanks in advance