Posts Tagged ‘APF’


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I would highly recommend installing a firewall either a graphical one such as CSF or at least a command line
one that you can rely on to open and close ports.

A couple of recommendations for you that are free to use:


This can be downloaded from the following link:

CSF has quite a features heres a few:

•Straight-forward SPI iptables firewall script
•Daemon process that checks for login authentication failures for:


This can be downloaded from the following link:

What is APF?

Advanced Policy Firewall (APF) is an iptables(netfilter) based firewall system designed around the essential needs of today’s Linux servers. The configuration is designed to be very informative and easy to follow. The management on a day-to-day basis is conducted from the command line with the ‘apf’ command, which includes detailed usage information on all the features.

A good package to also install as a part of APF only is BFD which is the Brute Force Detector
which can be downloaded from here:

What is BFD?

BFD is a modular shell script for parsing application logs and checking for authentication failures. It does this using a rules system where application specific options are stored including regular expressions for each unique auth format.