iptables deprecation note added

docs/guides/security/enabling_iptables_firewall.md

@@ -1,9 +1,24 @@
+---
+title: Enabling `iptables` Firewall
+author: Steven Spencer
+contributors: Ezequiel Bruni
+tested with: 8.5, 8.6, 9.0
+tags:
+ - security
+ - iptables
+ - deprecated
+---
+
 # Enabling iptables Firewall
 
 ## Prerequisites
 
 * A burning, unquenchable desire to disable the default _firewalld_ application, and enable _iptables_.
 
+!!! warning "This Process Is Deprecated"
+
+    As of Rocky Linux 9.0, `iptables` and all of the utilities associated with it, are deprecated. This means that future releases of the OS will be removing `iptables`. For that reason, it is highly recommended that you not use this process. If you are familiar with iptables, we recommend using [`iptables` Guide To `firewalld`](firewalld.md). If you are new to firewall concepts, then we recommend [`firewalld` For Beginners](firewalld-beginners.md).
+
 ## Introduction
 
 _firewalld_ is now the default firewall on Rocky Linux. _firewalld_ **was** nothing more than a dynamic application of _iptables_ using xml files that loaded changes without flushing the rules in CentOS 7/RHEL 7.  With CentOS 8/RHEL 8/Rocky 8, _firewalld_ is now a wrapper around _nftables_. It is still possible, however, to install and use straight _iptables_ if that is your preference. To install and run straight _iptables_ without _firewalld_ you can do so by following this guide. What this guide will **not** tell you is how to write rules for _iptables_. It is assumed that if you want to get rid of _firewalld_, you must already know how to write rules for _iptables_.