Firewall
| Firewall | provides the first line of defense for network security. The existing rule-set and security policies keep the attackers from finding a way to attack the system |
| Netfilter | software behind the packet filtering framework inside the linux 2.4.x and 2.6.x kernel series. Used with iptables a generic table structure for the definition of rulesets, enable packet filtering, network address [and port] translation (NA[P]T) and other packet mangling. |
| http://www.netfilter.org/ | |
| Firestarter | an open source visual firewall program suitable for use on desktops, servers and gateways. |
| http://www.fs-security.com/ | |
| SmoothWall Express |
SmoothWall's free, open source, GPL network firewall distribution that includes a hardened subset of GNU/Linux operating system. It is configured via a web-based GUI, and requires absolutely no knowledge of Linux to install or use.
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| http://www.smoothwall.org/get/index.php | |
| Hardwall Firewall | a firewall configuration script which is developed to run in the linux 2.4 and 2.6 series kernels utilising the IP Tables Netfilter for the linux kernel |
| http://www.hardwall.org/index.html |
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| IPFire |
linux based firewall distribution that can also act as a complete home server by installing addons such as Asterix PBX, SAMBA, CUPS and many more |
| http://www.ipfire.org/en/downloads.shtml |