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Mastering iptables could take a while, but if you have a few rules to cover the basic security needs, you’ll be well on your way to protecting your Linux system. Jack Wallen explains some key rules to get you started.

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The following is an example IPTables firewall script and its associated configuration files.

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psad is a collection of three lightweight system daemons (two main daemons and one helper daemon) that run on Linux machines and analyze Netfilter log messages to detect port scans and other suspicious traffic.

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Fail2ban scans log files like /var/log/pwdfail or /var/log/apache/error_log and bans IP that makes too many password failures. It updates firewall rules to reject the IP address.

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ModSecurityTM is an open source intrusion detection and prevention engine for web applications (or a web application firewall). Operating as an Apache Web server module or standalone, the purpose of ModSecurity is to increase web application security, pro

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FTester -- Firewall and IDS Testing tool

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