Didn't Intel introduce their PSN (Processor Serial
Number) "feature" not too long ago and then withdraw
it because of the VERY loud complaints about loss of
privacy? I think they introduced it as a "solution" to
this very same problem: there's currently no reliable
way to uniquely ID a system. This is probably a Good
Thing(tm). Intel claimed that their goal was something
to do with preventing piracy rather than enabling Big
Brother to track our every move.
It used to be the case that MAC addresses could be
relied upon to be unique and immutable (per Enet
adapter) but I've heard of some that now allow their
MAC addrs to be reprogrammed, and anyway the OS can be
told to lie about it. Nevertheless, if you can rely
upon all your systems to just use the MACs assigned
by the manufacturer for every Enet adapter, it might
be reasonable to decide that the MAC address of, say,
the lowest numbered interface is the system ID.
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