The Geek Stuff posted a Linux Firewall Tutorial
iptables firewall is is used to manage packet filtering and NAT rules. IPTables comes with all Linux distributions. Understanding how to setup and configure iptables will help you manage your Linux firewall effectively. iptables tool is used to manage the Linux firewall rules. At a first look, iptables might look complex (or even confusing).Linux Firewall Tutorial: IPTables Tables, Chains, Rules Fundamentals
