Firewalling

From securityrouter.org, an OpenBSD-based firewall
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The firewall is a layer 3 (IP) to layer 4 (eg. TCP) packet filter. Together with proxies and VPN flows they are what defines the router's security policies.

Clear-text configuration

The firewall can, just like the rest of the product, be configured by both the graphical user interface, and in clear-text. It is based on, and slightly extends, OpenBSD's PF which makes pf.conf's manual page[[1]] a great source of information. Not every possible feature is interpreted by the graphical editor.