from
http://www.rfxnetworks.com/apf/README
Quote:
APF is a policy based iptables firewall system designed for ease of use and
configuration. It employs a subset of features to satisfy the veteran
Linux user and the novice alike. Packaged in tar.gz and RPM formats, APF is
ideal for deployment in any linux server environment.
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so its uses iptables for the actual firewall part, like most linux firewalls (or was it all?)
http://www.rfxnetworks.com/apf.php
seems good enough, but for most people even a simple firewall is good enough .. this one certainly likes to block things .. so it should be good for lots of uses