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Some MACs are created equal

Apparently not all NICs have unique MACs.  This is news to me.

Thread in microsoft..csharp

Posted: Jul 13 2003, 03:01 PM by jeffreykey | with 2 comment(s)
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Phil Scott said:

We had two network adapters here at work with the same MACs. They were some pretty generic (i.e. 8 bucks a pop) network cards.

Shut down the whole network somehow. Took a week to figure out. You just don't think "hmmmm, what if two nics have the same MAC address?"
# July 13, 2003 5:17 PM

Jerry Dennany said:

The IEEE is the governing body for MAC address assignment, just as IANA governs the IP address space. The problem is that some hardware vendors are too cheap (or dumb) to follow the IEEE standard. (I once worked for a vendor that falls into the latter category).
# July 13, 2003 8:53 PM