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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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 …