Well your neighbour can tell your router that he is your computer by using your MAC adress. That is spoofing your mac adress. However if you have WPA or WEP secured router he also needs your password. What twisted demon meant was using a mac filter, to deny access to the 'invading' computer by banning his mac adress. But in that case he can just copy your mac adress 
.
Well 2 years ago WPA was only hackable with libraries, which needed to contain the exact same word. So basically what it did was trying every password in the library.
But i'm using WPA2 currently. Probably not hack proof either but it's at least noob-proof.
On my router i can log all traffic so if someone else is on there or i see that websites are being visited which me or my gf never visit I can take action.
.Well 2 years ago WPA was only hackable with libraries, which needed to contain the exact same word. So basically what it did was trying every password in the library.
But i'm using WPA2 currently. Probably not hack proof either but it's at least noob-proof.
On my router i can log all traffic so if someone else is on there or i see that websites are being visited which me or my gf never visit I can take action.