Server security is the most important thing we should consider as a system administrator. We don’t want any unauthorized person gets into our system an messing around it. On this tutorial, you will find a detailed instruction how to harden your OpenSUSE server. The software or package we discuss here is Arno IPTables, an advanced security tool for Linux.
Iptables is an application that allows a user to configure the firewall security tables provided by the Linux kernel firewall and the chains so that a user can add / remove firewall rules to it accordingly to meet his / her requirements. Read the complete guide on how to install and configure Arno IPTables here.