http://www.base2co.com/zeroshell.php ZeroShell is a Linux based firewall. This package has everything you need out of the box. Now all you need to know is how to use each feature. Standard Linux packages, including dns, kerberos, radius, Qos and more. I have been building firewalls with Linux since 2002 and have been happy to use Zeroshell as a deliverable firewall for my customers. en-us