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.
Changes: Performance, accuracy, and stability were improved. Many HTTP rule keywords added. Several SSL keywords have been added. Event suppression support was added. SCTP decoding support was added. IPS mode was improved. An SMTP parser was added. Protocol detection was improved. Extended HTTP output was added. AF_PACKET support was added. PF_RING support was improved. Pcap logging was added. The stream engine was improved.
Download - http://www.openinfosecfoundation.org/index.php/downloads
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