Mac Address Logging / Banning

[#01]

Is it possible for somebody to make a hack that would Log Mac Addresses and put it in the same area where the IP is shown?

Or is there a reason why this has never been made before? I would think this would be a more secure way to ban people. Especially ones who have a different IP all of the time.

I also want to ask... in the case of 56kers... Do they pass their mac addresses on the net? Or is their mac address hidden by a proxy? Do proxys hide mac addresses?

I would really like to have this feature built into my forum. If someone can do this... or has allready made a hack like this... can you email me at... c@2si.us (This is the email I check most often)

Thanks!!!