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:


In this case, we’re going to focus on the INPUT chain (Incoming to firewall. For packets coming to the local server)


Automation I implement these rules using the puppet-iptables module. The module is regularly updated and has a very large feature-set.


Last modified: 25 April 2020