slackbuilds_ponce/network/shorewall-core

shorewall-core (Iptables Made Easy)

The Shoreline Firewall, more commonly known as "Shorewall", is a Netfilter
(iptables) based firewall that can be used on a dedicated firewall
system, a multi-function gateway/router/server or on a standalone
GNU/Linux system.

As of version 4.5, shorewall consists of 3 packages: 

* shorewall-core, containing common elements to both IPv4 and IPv6 components
* shorewall, the IPv4 component
* shorewall6, the IPv6 component

The shorewall-core package is needed for both but now you can install
the IPv6 packages without needing the IPv4 one if you are on aIV6
network only.

xtables-addons is an optional dependency to use the new per-IP accounting
feature.