How to authenticate the user using the PC Mac address

[flamer_Z86]

Is it possible to only allow users to access my website with their PC Mac Address authentication? One's the user access my website, the mac address will be first check if it is a valid mac address before it will completely view my website. Or is it ideal to only use certificate authentication? Please advise if what's more secure? or just by using https instead of http? Thanks

[Quantos]

Why would you use that for security?
PC Mac Addresses are easily spoofed, it's really not a good method for that.