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Re:An Oral History of Diablo II by executesorder66 on Wednesday September 09, 2015 @05:30AM (#10190511)
A quick web search [0] indicates that it cannot be changed but only spoofed.

[0] https://en.wikipedia.org/wiki/MAC_spoofing

Re:An Oral History of Diablo II by SixSigma on Wednesday September 09, 2015 @08:20AM (#10190946)
Logically, that's the same. The chosen MAC is sent to your next hop and that's that.

Some devices store the MAC in some sort of writable NVRAM.