>> ifconfig en0 link 00:03:93:ce:11:32
> Yes! Please!

This would be good to have.  However, at least back when I looked at
it, it appeared to mean changing every Ethernet driver in the system,
which was more than I was prepared to do at the time.

I suppose you could do it via an internal ioctl or some other mechanism
which un-updated drivers can refuse, and then just ahve it not work if
the driver in question doesn't like it.

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