The primary type provided and used in the firewall module is the firewall type. This type contains a whole slew of parameters that allow you to configure every aspect of the firewall rules. This is necessary because the base iptables software has many options that you can pass to rules. To model rules successfully, the underlying type and provider needs to support all of the features that you can do on the command line. This results in a very large parameter set. A summary of some of the most commonly used parameters as of Version 1.2.0 are described in the following table: