Se volete provare un firewall per Ubuntu semplice da configurare, potete provare:
Uncomplicated Firewall (ufw)
- http://gufw.org/ [EN]
- https://wiki.ubuntu.com/UncomplicatedFirewall [EN]
- https://it.wikipedia.org/wiki/Uncomplicated_Firewall [IT]
- https://en.wikipedia.org/wiki/Uncomplicated_Firewall [EN]