Rc.firewall is an ipchains based firewall setup script with easy support for many network services, masquerading, port forwarding, and IP accounting. Protections include spoofing, stuffed routing / masquerading, DoS, smurf attacks, outgoing port scans, and much more.
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Firestorm is a Network Intrusion Detection sensor which is multi-threaded, fast, and is pluggable at almost every point.
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