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If you are looking to pen-test your router/WAP, use nMap, from insecure.org. There's an online version you can use to attack your own router, or you can simply use your public IP as the target. I suggest using fragmentation attacks. If you want to target machines on your LAN i.e. inside your network, use the software nMap on a second machine and "attack" the private IP of the LAN machine. However, if somebody is using your wireless connection, it's not due to an open port - it's due to your wireless not being locked down.
You may be able to tell if your neighbors are tapping your connection by simply logging into your router and looking at the IPs and/or MAC addresses of the LAN/wireless clients. If you see two machines logged on and only have one running, you have your answer. Or if you see a machine with a MAC address that doesn't belong to a machine you own, and you've reset the router recently, you have your answer. One thing you can do is permit only the MAC addresses of machines you own to connect, among other things like encryption and limiting LAN IP which may be used to the number of machines that you want connected at one time.
If you have a spare machine with two NICs you can run a sniffer like Wireshark and monitor the connection between, say, your cable modem and the router/WAP. In fact, you can even use a one-NIC machine if you put a hub (not ethernet switch, but a true old-fashioned HUB - they're about $10 on ebay) between the router and modem, with the "third leg" of the connection going to your sniffing computer. Don't use any of your machines and you won't have to do much sanitization. If that were somebody latching onto *my* cable they'd get a nice dose of a Man-in-the-Middle attack.
-Do you believe you own your computer and shouldn't be told what you can run and do? Then say *NO* to Microsoft Vista!
-Since half the questions here involve media problems, here ya go: Only use Verbatim or Taiyo-Yuden discs (get your TYs from Rima.com, not Supermediastore or meritline). Forget the rest, no matter what "brand" they sell under. Always burn at 4x speed regardless of the speed rating of this discs or your drive. If you have burn problems with these then you have to update your drive's firmware. For double-layer discs, only use Verbatim DVD+R DL and burn them at 2.4x speed.
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