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What is the difference between Snort and Bro?

While Bro and Snort and both open source intrusion detection systems, they use different methods to detect intrusions and can complement one another on the network.

Bro is the only other real open source network intrusion detection system supported by a significant community of users. Vern Paxson of the University of California at Berkeley is the lead developer. Bro is considered a specification-based network IDS. Bro uses a variety of protocol analysis modules to inspect traffic and make judgments regarding its conformance to various norms. It is actually a very powerful complement to Snort.

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