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The first 3 sets of numbers, or the first 6 numbers indicate the manufacturer of the network adapter, and the last 3 sets of numbers or the last 6 numbers indicate the unique number that the manufacturer gave to that specific network adapter. So, right there, you can see that an obvious security issue exists. Which is just one more reason to obtain a good firewall and to block sites and other users on the internet from seeing your MAC address. Also, if you use Win2k or Linux you may be able to change what others see as your MAC address. To find instructions on this plz see my other tut on MACs at
You don't seem to understand a very crucial piece of information about MAC addresses. You said that MAC addresses are used at the data link layer. Do you understand what that means? That means that when your box sends the packets across the wire towards their eventual destination, your box plants your MAC address inside the ethernet header. Then, the very next router that your packet hits along the way throws your MAC address away and put's its own MAC address in the ethernet header as it sends it along to the next router. So the only machine that ever sees your MAC address is the first router outside your personal network, regardless of how often you change and/or protect your MAC address. AKA, you can't protect yourself from people on the internet seeing your MAC address because they never see it anyway.