FirewallBuilder

First of all, activate JFFS/JFFS2 (Journaling Flash File System) on the firewall. Instructions are provided in the DD-WRT wiki. Once jffs is mounted read-write, create directory "/jffs/firewall" where fwbuilder will store generated script. This is explained in this article in DD-WRT wiki.

When the firewall is configured with host OS "DD-WRT (jffs)", built-in policy installer copies generated script to the file "/jffs/firewall/firewall.fs" on the firewall and configures nvram variable "rc_firewall" to call this script. In the older versions of Firewall Builder you had to configure the program manually to do these steps per in DD-WRT wiki. Firewall Builder 4.0 implements this configuration out of the box.

The generated script is assembled from parts defined in configlets located in directory /usr/share/fwbuilder-4.0.0/configlets/dd-wrt-jffs/. You can modify it following instructions in Chapter 13.