inliniac

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Suricata is a network intrusion detection and prevention engine developed by the Open Information Security Foundation and its supporting vendors. The engine is multi-threaded and has native IPv6 support. It's capable of loading existing Snort rules and signatures and supports the Barnyard and Barnyard2 tools.

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Vuurmuur is a firewall manager for Linux that supports traffic shaping. It has powerful monitoring features for logging and live connections. It can be managed entirely through an Ncurses GUI, on the console, or through SSH.