Abstract
This little tool allows you to set up a
basic firewall on your machine. It will filter connection attempts
made from the outside, and block unauthorized ones. It is a good
idea to run it just after installing your
machine and before connecting to the
Internet, therefore minimizing the risks of your machine being
cracked.
Simply uncheck the Everything (no firewall) box, and then check the boxes corresponding to the services you wish to make available to the outside world. If you wish to authorize a service which is not listed here, click on the button to manually enter the port numbers to open.
Not checking a service in this list will not prevent you from connecting to it. It will only prevent people from the Internet to connect to that service on your machine. If you do not plan to host any services on your machine (common case for a desktop machine) just leave all boxes unchecked.
If, on the other hand, you wish to disable the firewall and leave all services accessible from the outside, check Everything (no firewall) , but please bear in mind that this is very insecure, and therefore not recommended.
Then clicking on will bring you to the next step, which consists in selecting the network interface connected to the Internet.
Refer to the examples to determine your Internet interface's name. If you are unsure, you can check the system network configuration (see Section 1.3, “Managing Connections”). You can finally click to install the needed packages, activate the firewall and enjoy your secure Internet connection.