In some mail from Nick Holland, sie said: > > Kirk Ismay wrote: > > > > Slightly off topic, but has anyone ever seen 2 separate systems with the > > same MAC address? I thought this was a "never supposed to happen" kind of > > thing as MAC's are supposed to be globally unique. However, I've had this > > happen twice now with clients on my ADSL network (I use an OpenBSD/PF box > > as a router/dhcp server). > > Yep. I actually saw it as a manufacturing defect, something like 13 > or 14 years ago. Not only did (at least) two NICs get manufactured > with the same MAC addr, but they both ended up at the same customer, > same network, same segment of coax.
(30+) for a lab of PC's, of NICs with the same MAC address. If you go hunting for design discussion during the 90s of IPv6, you might find a better reference to this. Since then, I have cautioned people against treating the MAC address as being unique on a global scale. Darren
