Shorewall (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. Common files for the shorewall firewall compilers You will need at least one of the compiler packages (shorewall-perl or shorewall-shell) to use shorewall.