FireHOL is a shell script designed as a wrapper for iptables written to easy the customization of the Linux kernel's firewall netfilter.FireHOL does not have graphical user interface, but is configured through an easy to understand plain text configuration file.A further advantage of FireHOL is its friendliness to beginners - you don't have to worry about the answer packet because FireHOL first parses the configuration file and then sets the appropriate iptables rules to achieve the expected firewall behavior.It is a large, complex BASH script file, depending on the iptables console tools rather than communicating with the kernel directly.