In creating an exact copy of the SD card, I am also picking up the MAC and serial number of the original Pi, how do I maintain the MAC and seri I am using this image as a base for any additional SD cards I will be using in other Pis. > I have one SD card image that I have updated/upgraded and added packages to my liking. Is there a possibility that the MAC address of the original Raspberry PI is copied across with the Image and that is what is conflicting? I have created an image of the SD card and inserted it in another Raspberry PI Zero W. I have one PI working with my local Wifi. Seems like remember in some cases MAC addresses can be set by software. > I cloned the SD in my upstairs Pi and put it in my downstairs Pi. > My hypothesis was correct somehow the os/sd card stores the Mac address it was installed on (!). I'm reporting my results here to document the results of my research. In digging deeper, I found a post that identified the Raspbian code that likely causes this bug. On the contrary, several user responded: "The MAC address should be set by the network adapter, not the SD card or OS" ( i.e., "this bug shouldn't exist, here is the anticipated behavior") Nobody in any of the conversations acknowledged this as established or familiar behavior. However, this behavior appears to be poorly understood. I found a surprising number of users reporting the same behavior. I reported my experiences to OP, and then did a bit of research to see if we're crazy or if others have seen this quirk as well. This is very weird behavior, as you'd expect the MAC address to be unique per network adapter - but it is behavior that I noticed before.
OP in that thread asked about an incident in which booting one Pi (let's call it Pi #1) with an SD card that was initially used in another Pi (let's call it Pi #2) causes Pi #1 to report the MAC address for Pi #2 for its WiFi and Ethernet adapters. Today, this conversation arose about MAC addresses in Raspbian.
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