Advanced Policy Firewall (APF)

In Linux we impliement firewall by means of iptables. Here is the iptables based firewall called . To use apf use must first download apf.You can download the apf in following URL:
http://www.r-fx.ca/downloads/apf-current.tar.gz

After downloading,install the apf by extracting the zip file and running the file install.sh in the shell.

Now just type apf, it will list the option that can be used with apf command
APF-implements security in following ways
1)iptables Rule-base polices
2)packets matching
3)known attack methods

apf can used when you fell configuring iptables is complex one, and apf have readymade iptables which will secure your machine from various attacks.