GUI for creating Firewall rules - Firestarter

Firestarter is an open source firewall for Linux with an easy-to-use graphical user interface. The software aims to combine ease of use with powerful features, therefore serving both Linux desktop users and system administrators.

It also enables Internet sharing and allows you to define both inbound and outbound access policy with the option to whitelist or blacklist traffic. You can easily watch the active internet connections including the traffic routed through the firewall.

Firestarter features
    * Open Source software, available free of charge
    * User friendly, easy to use, graphical interface
    * A wizard walks you through setting up your firewall on your first time
    * Suitable for use on desktops, servers and gateways
    * Real-time firewall event monitor shows intrusion attempts as they happen
    * Enables Internet connection sharing, optionally with DHCP service for the clients
    * Allows you to define both inbound and outbound access policy
    * Open or stealth ports, shaping your firewalling with just a few mouse clicks
    * Enable port forwarding for your local network in just seconds
    * Option to whitelist or blacklist traffic
    * Real time firewall events view
    * View active network connections, including any traffic routed through the firewall
    * Advanced Linux kernel tuning features provide protection from flooding, broadcasting and spoofing
    * Support for tuning ICMP parameters to stop Denial of Service (DoS) attacks
    * Support for tuning ToS parameters to improve services for connected client computers
    * Ability to hook up user defined scripts or rulesets before or after firewall activation
    * Supports Linux Kernels 2.4 and 2.6
    * Translations available for many languages (38 languages as of November 2004)

Installation on Fedora Core, Red Hat Linux, SuSE or Mandrake
Firestarter is conveniently available in RPM package format for RPM enabled Linux distributions like, Fedora Core, SuSE and Mandrake.

Once you have downloaded the Firestarter RPM specific to your distribution, open a terminal and change to the directory where you downloaded the RPM to. Type the following commands as shown in bold to install the package:

# rpm -Uvh firestarter*rpm

Installation on Ubuntu
Installing is very easy. Simply open your Terminal window, and type:

sudo apt-get install firestarter

Compiling and installing from source
Start by downloading the tar.gz version of Firestarter. Unpack the tarball and move into the newly created directory:

# tar -zxvf firestarter*tar.gz
# cd firestarter
# ./configure --sysconfdir=/etc
# make
# make install