Basically, whenever you need to change your firewall rules, you would use this script to add/remove the desired rule(s). To make the management of your server’s firewall rules easier, we will provide a simple shell script that will help with the management of the firewall rules. In order to keep down the number of attempted break-ins and to filter the ports opened on your virtual server, it is necessary to properly configure your firewall. It is is a user space application program that allows a system administrator to configure the tables provided by the Linux kernel firewall ( implemented as different Netfilter modules) and the chains and rules it stores. In the following article we will show you how you can secure and protect your Ubuntu or Debian based virtual server using a firewall application, called iptables.
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