Penetration Testing mailing list archives

Re: What does a network having all identical MAC addresses mean?


From: "Mark C at Uniontown.com" <bugtraqlists () uniontown com>
Date: Tue, 13 Nov 2007 10:07:37 -0500

Scanning IP's on the opposite side of a Layer 3 device (aka router) will show them all to have the same MAC (the MAC of the router).

-Mark Coleman



Paul Greene wrote:
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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