How to Make iptables Firewall Rules Persistent on Debian/Ubuntu
Here's how to keep iptables firewall rules persistent between reboots so you don’t lose them after the system is rebooted.
Raspberry Pi Firewall: How to Install and Manage it by Using UFW
In this easy-to-follow tutorial, we will show you how to install and manage UFW (Uncomplicated Firewall) on Raspberry Pi.
Firewalld 1.0 Firewall Management Tool is Here with Big Improvements
Ten years after its first release, Firewalld reached version 1.0. The biggest change is removing Python 2 support.