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I started messing around with my raspberry pi and I build a simple linux embedded system using buildroot and I found my IP address was different to what I was expecting (I had DHCP configured) then I found that my MAC address was different everytime I booted the system, when I was using Raspbian the MAC was always the same. I know how to spoof the MAC but I would like to know why does this happens. Can someone help me?

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    The MAC address is stored some place on your Pi (eeprom?). The original distribution knew this location, and read it and set the interface accordingly. – Stephen Rauch Mar 25 '17 at 0:26
  • Sorry to ask again after 6 days, I don't know even if you'll answer, but then, is there a way to configure buildroot to make it know where to look to get it? – Cypert Apr 1 '17 at 19:36
  • Unfortunately I do not know the answer to that. It is likely in some driver code somewhere, but while I have been doing embedded Linux for 15 years, I do not know the Pi. It would likely be a make a great question at raspberrypi.stackexchange.com – Stephen Rauch Apr 1 '17 at 19:41
  • Sorry for answering so late, but I've just found out it was because I was using an old version of the bootloader I was using (uBoot) – Cypert Apr 18 '17 at 22:19

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