FireHOL
Encyclopedia
FireHOL is a firewall application designed to work with a lower level firewall utility for the Linux kernel, iptables.
FireHOL does not use a GUI
, 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. This has the advantage of portability; any Linux system with iptables, BASH, and the appropriate tools can run it. Its main drawback is slower starting times, particularly on older systems. Since this delay only happens once per boot—or less, if the resulting rules are saved to disk—high performance for this is not generally important except in embedded systems.
FireHOL also benefits from the shell's flexibility, being easily extended and configured to a high degree; FireHOL's configuration files are fully functional BASH scripts in of themselves. You can write scripts in normal shell syntax and they will operate as expected; you might loop a FireHOL statement to forward an entire set of ports, for example.
FireHOL is free software
, distributed under the terms of the GNU General Public License
.
FireHOL does not use a GUI
Gui
Gui or guee is a generic term to refer to grilled dishes in Korean cuisine. These most commonly have meat or fish as their primary ingredient, but may in some cases also comprise grilled vegetables or other vegetarian ingredients. The term derives from the verb, "gupda" in Korean, which literally...
, 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. This has the advantage of portability; any Linux system with iptables, BASH, and the appropriate tools can run it. Its main drawback is slower starting times, particularly on older systems. Since this delay only happens once per boot—or less, if the resulting rules are saved to disk—high performance for this is not generally important except in embedded systems.
FireHOL also benefits from the shell's flexibility, being easily extended and configured to a high degree; FireHOL's configuration files are fully functional BASH scripts in of themselves. You can write scripts in normal shell syntax and they will operate as expected; you might loop a FireHOL statement to forward an entire set of ports, for example.
FireHOL is free software
Free software
Free software, software libre or libre software is software that can be used, studied, and modified without restriction, and which can be copied and redistributed in modified or unmodified form either without restriction, or with restrictions that only ensure that further recipients can also do...
, distributed under the terms of the GNU General Public License
GNU General Public License
The GNU General Public License is the most widely used free software license, originally written by Richard Stallman for the GNU Project....
.