For example, the Snort IDS is extremely popular. It's an open source network intrusion detection system that is...
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widely used in the enterprise. As an open source product, Snort is available at no cost and has a large community of developers creating rules.
Sourcefire, the company behind Snort, makes an official ruleset available to Snort users either in real-time (for paid subscribers) or on a 30-day delay (at no charge). This is the best way to obtain a reliable, timely ruleset. If you're using a different IDS product, consult the vendor for details on rulebase subscriptions.
Dig Deeper on Network Intrusion Detection (IDS)
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