husk is a natural language wrapper around the Linux iptables packet filtering engine (iptables).
It is designed to abstract the sometimes confusing syntax of iptables, allowing use of rules that have better readability, and expressed in a more 'freeform' fashion compared to normal 'raw' iptables rules.
husk can be used on either firewall/router computers (with multiple network interfaces), or standalone systems (with one network interface)
Each interface (real or virtual) is called a 'zone' in husk. Zones are given a friendly name which is what is used in the rule definitions. This abstracts the Linux device names (eg, eth0, ppp0, bond0 etc) into much more intuitive names such as NET, LAN and DMZ. This has the added benefit of moving interfaces in the future can be done simply by changing the name-to-device mapping.