IPTables Firewall Tutorial

Ronan Kirby posted a lengthy, but excellent tutorial on Linux IPTables to the CLUG this morning.
He goes through the commands needed to create a simple firewall for a gateway or client machine and explains each stage well.

2006-10-11 – Ronan’s post has moved here somehow.

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Donncha Ó Caoimh is a software developer at Automattic and WordPress plugin developer. He posts photos at In Photos and can also be found on Twitter.

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Iptables – Example Firewall Rulesets

Two example iptables firewall rulesets are provided. Both are designed for a single-homed host and utilize the stateful inspection feature of iptables for all connections.

Original simple ruleset

This is the original deny-based ruleset. It’s …

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