Securing your Ubuntu/Debian based VPS using IPTABLES/Netfilter firewall

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.

What is iptables?

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.