The Shoreline Firewall, more commonly known as “Shorewall”, is a high-level tool for configuring Netfilter. You describe your firewall/gateway requirements using entries in a set of configuration files. Shorewall reads those configuration files and with the help of the iptables utility, Shorewall configures Netfilter to match your requirements. Shorewall can be used on a dedicated firewall system, a multi-function gateway/router/server or on a standalone GNU/Linux system. Shorewall does not use Netfilter’s ipchains compatibility mode; as a consequence, Shorewall can take advantage of Netfilter’s connection state tracking capabilities to create a stateful firewall.

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