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<a href="http://en.wikipedia.org/wiki/Iptables" rel="ugc">http://en.wikipedia.org/wiki/Iptables</a>
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http://en.wikipedia.org/wiki/Iptables [http://en.wikipedia.org/wiki/Iptables]

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Here is another reference for you<br />
<a href="http://www.cyberciti.biz/faq/category/iptables/" rel="ugc">http://www.cyberciti.biz/faq/category/iptables/</a>
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Here is another reference for you
http://www.cyberciti.biz/faq/category/iptables/ [http://www.cyberciti.biz/faq/category/iptables/]

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Introduction to Iptables and Firewalls with Iptables<br />
<a href="http://www.vercot.com/~jeoss/howto/JeossEasyFirewall.html" rel="ugc">http://www.vercot.com/~jeoss/howto/JeossEasyFirewall.html</a>
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Introduction to Iptables and Firewalls with Iptables
http://www.vercot.com/~jeoss/howto/JeossEasyFirewall.html [http://www.vercot.com/~jeoss/howto/JeossEasyFirewall.html]

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Could someone tell me what this is doing
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iptables

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.