Not to be a stickler, but to someone who is really trying to get in a MAC address block is not going to stop him. All those packets are going out over the air, all they have to do is watch them for a bit, see which MAC it allows and boom any good card lets you change your MAC now.
WEP is better, but we had a tech forum at work just a short while ago and there are many programs that are out there that can crack a WEP password in 30 minutes. Yes 30 minutes. And all they have to do is watch the traffic you are sending about in the air.
WPA is better than WEP, but I believe its still crackable. I am not familiar with LEAP as its Cisco router centric.
But at the least do what everyone is suggesting, change your name, stop broadcasting your SSID if you can, and setup WEP, that way at least you have tried to lock the door.
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