So as the title says, I have what I consider to be a "secure" network. I use WPA - PSK security with a very jumbled password, as well as MAC address filtering. So when I got home from work and opened up a finder window, I see "DARIN-PC" in my network connections, as well as my desktop and my wife's MacBook. My neighbors name is Darin, though he is dumb as a brick (or so I thought?) and I didn't think he knew anything about computers, and thus be to dumb to hack into my network. I looked in my MAC address list and there is a NEW address, that I have not put there. So... 1. How can I find out who this is? Or at least an his/her IP address? 2. How was this person able to "sneak" into my network? 3. How can I prevent this from happening again? Any help would be greatly appreciated. Thanks!