iptables is the userspace command line program used to configure the Linux 2.4.x and 2.6.x IPv4 packet filtering ruleset. It is targeted towards system administrators.
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.
DenyHosts is a script intended to be run by Linux system administrators to help thwart SSH server attacks (also known as dictionary based attacks and brute force attacks).
If you've ever looked at your ssh log (/var/log/secure on Redhat, /var/log/auth.log on Mandrake, etc...) you may be alarmed
... [More] to see how many hackers attempted to gain access to your server. Hopefully, none of them were successful (but then again, how would you know?). Wouldn't it be better to automatically prevent that attacker from continuing to gain entry into your system?
DenyHosts attempts to address the above... and more. [Less]
Firewall Builder consists of a GUI and set of policy compilers for various firewall platforms. It helps users maintain a database of objects and allows policy editing using simple drag-and-drop operations. The GUI and policy compilers are completely independent, which provides for a consistent
... [More] abstract model and the same GUI for different firewall platforms. It currently supports iptables, ipfilter, ipfw, OpenBSD pf, Cisco PIX, and FWSM. [Less]
ulogd2 is a userspace logging daemon for netfilter/iptables related logging. This includes per-packet logging of security violations, per-packet logging for accounting purpose as well as per-flow logging.
sshguard protects hosts from brute force attacks. It supports IPv6, whitelists and log authentication, interfaces with all the major firewalling systems, has a remarkably clever log analyzer, and is independent, fast and lightweight as it's written in C
Vuurmuur is a powerful firewall manager for Linux. Vuurmuur supports IPv4, IPv6, traffic shaping and live monitoring. It has an easy to learn configuration that allows both simple and complex configurations, and can be fully configured through the Ncurses GUI.
Firetable is an IPtables firewall script for Linux, written in PHP. A very powerfull feature of Firetable is that it can handle multiple network devices at the same time.
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