RHEL - Shorewall installation

So you're ready to start installing applications on your slice and, rightly, you want to make sure that you're nice and secure. IPTables, right? Well, sure, but the only thing is that IPTables can be a messy beast to deal with. That's where Shorewall comes in.

Shorewall is the common name for the Shoreline firewall, a “wrapper” for IPTables that will handle all the heavy lifting for you. This article will get you started, showing you how to get Shorewall on your system.

Mail server - Opening ports in the firewall

In the previous article, we installed and configure the basics of courier. Now we need to open the ports in our firewall so we can access those services.