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The answer to that is no.  NAT translation within IP Routing devices prevents it.  As your IP packet gets deconstructed within the routers the MAC address gets changed out with that devices MAC address so by the time your IP packet gets to the destination the MAC address has changed multiple times.

 

An alternative is to place a cookie on their computer and look for the cookie, place a temp file on their computer and look for a temp file, use database or file cached saved PHP sessions.

 

Wayne

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