>>5
- Get additional box.
- Install GNAA/Lunix.
- Install squid proxy.
- Place box between you and internet, as far physically away from your normal PC.
- Do not enable packet forwarding.
- Set your box to go through the squid proxy.
- Block hosts on proxy box (/etc/hosts should be okay).
- After beeing done with setup, remove screen/mouse/keyboard from proxy box. DO NOT install any means of remote control (Like an ssh server).
The result:
- You can only use HTTP and FTP.
- You can't go to pages blocked on the proxy box.
- To change anything, you'd have to attach a screen and a keyboard to the proxy box, which is a lot of stuff just for changing something.
If that isn't enough, just set a random password on the proxy box.