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A MAC address can be spoofed MUCH more easily than an IP, like ADDiCT mentionned. Any user can change his MAC address as he see fit.
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My cable modem get my NIC's MAC adress and if i change of MAC internet doesn't work anymore (I have to call my provider to ask resetting modem). And less people know MAC spoofing than IP Spoofing
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ioFTPD doesn't have any idea what the MAC address of the client is. io deals with TCP/IP, not raw ethernet packets. Having it dwelve lower in protocols would require more resource, not less.
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it will require more resource only on connecting. That's not a problem. I don't think there are not lots of people connecting to a ftp at the same time. If yes, it's not a problem because computers have enough ressource to do it.