Shoreline Firewall, netfilter configurator

 Shorewall allows firewall/gateway requirements to be described using
 entries in a set of configuration files. It reads those configuration
 files and, with the help of the iptables utility, configures
 netfilter to match these requirements.
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 Shorewall supports a wide range of router/firewall/gateway applications,
 traffic shaping and almost every type of VPN.