I would suggest an easier route of resetting your router and re-configuring the security settings correctly (use a strong passphrase with WPA2, hide the SSID if you want and/or enable MAC filtering if you want).

Eager,

I would highly suggest taking Bill and Kev's advice, you have no idea what the other party could be doing with your connection.

Besides the fun has already been had before (upside-down-ternet)

I'd suggest re-configuring your device and having a laugh at someone elses story. You still get a laugh with none of the potential risks.

Won't do much good against any sort of modern OS.

Now, if he has a network that is vulnerable to Smurf- or Fraggle-style attacks, he may be able to DDoS the guy.....but that (by definition) will also be hitting his own connection, so is a bit questionable as a concept for revenge.

Firing up Ettercap and injecting himself into they guy's traffic may allow for some fun (from the harmless -- switching images, etc. -- to the not so harmless -- harvesting of passwords, session hijacking, etc.)

All in all, though, I would take the advice above and just get rid of the guy rather than risk him knowing more than you do.

If you _really_ want to go after him, do yourself a favor and move any sensitive machines onto a separate network/wireless first.....then tie your attack box into the compromised wireless and go after him with at least a modicrum of impunity.

I'll agree with the rest of the crowd... but since you asked about fun...

He is on your network, right? And you have every right to pen test your own network. After all, you own it, so you can give yourself permission.

Why not practice the steps in a real pen test. Give yourself some good practice with Nmap, Nessus, Metasploit, fgdump, 0phcrack, etc.

Who said fun couldn't be educational, too!!

Don

Thanks for the Advice. Im not worried too much about my data as most of it is game data packages. I have a pretty good idea who it is. I saw somthing strange from the window of a house 5 doors down the other night, as i was drivng to my house from the top window I could see a blue blinking light small but bright then today the same window has a round silver thing looks like a culander with what looks like a wifi stick. poss directional wifi (home made) I have a 22 air rifel so im going to shoot it next time I see someone connected.

Dude......CHILL!

try that and you will be getting arrested. And nothing to do with your 1337 skillz.

Please tell me you're not serious

ET Phone Home, best call the MIB