Complete guide to iptables implementation

I’ve been wanting to put this article together for some time, a complete guide to implementing iptables on a Linux Server. Firstly, my assumptions: * You have a reasonable grasp of Linux and Iptables * You want to use Iptables to secure a Linux server The Basics Iptables has by default three chains for the FILTER table: * INPUT * OUTPUT * FORWARD In this case, we’re going to focus on the INPUT chain (Incoming to firewall. »