Knowledge Bank

From how to best plan and execute a server migration through to utilising MySQL replication, this section is full of white papers and best practice guidelines, produced by the experts here at ForLinux to help you get the most from your Linux server.

Managing your Firewall with APF and BFD


Advanced Policy Firewall (APF), along with its companion application Brute Force Detection (BFD), are two useful security tools developed by R-fx Networks Projects which can help defend your server from attack. This white paper outlines the process of installing and configuring both APF and BFD and how best to utilise these tools to protect your on-line environment.

The Internet can be a very dangerous place for a server sitting on­line without the protection of a firewall. However, setting up an iptables ruleset manually can be intimidating, and it is easy to make mistakes. APF (Advanced Policy Firewall), along with its companion application BFD (Brute Force Detection), are two useful security tools developed by R­fx Networks Projects that can help to simplify this process.
APF is a firewall system that utilises the latest features from the iptables(netfilter) project to provide a robust, but easy to manage, firewall.  BFD parses the server logs for failed logon attempts. Once a pre­configured number of failures from an IP address have been recorded (25 is the default), it blocks the IP address by adding it to the APF deny list.

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