Originally Posted by
dtsm
With all due respect, you're making a mountain over a mole hole. And as most others have already commented, you're just
paranoid 
Thank you for the respect you chose to give. I suppose however little respect you give me is all that's due. Since I have not stopped looking for expertise, I would like to know if your diagnosis of
paranoia has anything to do with your expertise?
BTW can you also check my back, it's been hurting lately.
Originally Posted by
dtsm
I have a similar set-up, including Mac filtering, non-broadcast of SSID, WEP (not even WAP because some of our computers are OLD). The set-up is to discourage free-loaders accessing our wifi; it's not bullet-proof. The fact that you 'discovered a BB' means either you didn't properly configure your set-up or it was as you later discovered your home-guest with a new toy.
If someone wanted to hack your network, they would have done so regardless of the safeguards you listed.
I too used to have WEP with MAC filters. But I learnt, here and other places that MAC address is transmitted unencrypted in the header. My connection now is fast enough that bandwidth stealing is not a problem if all someone is using the stolen bandwidth is to surf. It's the other stuff I am worried about. If you read the discussion, the problem isn't a a stray user hacking into the network, but a hole in the network can be created by a user who is lackadaisical and unconcerned about the security.
It's clear that you haven;t read the discussion carefully. Since then I have discovered other devices whose MAC address doesn't belong to anything we own.