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I started using ubuntu in january, but i still havent even found out if it has a firewall. I have now installed feisty fawn, but basically all i am wondering is does Ubuntu come with a firewall already installed? What releases have firewall already installed?, if not... is installing a firewall worth it? and how would i go about installing a firewall>?
By default iptables are setup for restrictive inbound traffic and permissive outbound traffic. All options can be configured from the command line but using Firestarter (a GUI frontend) makes it much easier. Firestarter documentation is here: http://www.fs-security.com/docs.php
There is much people who are confused if Firestarter is not raised firewall is it either (it happened to me). It was a clarifying commentary. It didn't want to indicate that the use of Firestarter was worse sight