What does a network having all identical MAC addresses mean?

[Paul Greene <techlists () comcast net>]

I was in a free wi-fi hotspot the other day and just for kicks ran an 
NMAP scan to see how many people were logged on.

I noticed something peculiar though. Every IP address had identical MAC 
addresses. Is this some security thing the hotspot had going on? Or is 
it some kind of devious thing going on by one of the other customers in 
the hotspot?

PG

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