snort is not available for BSD but there are a few alternatives with similar functionality. The best BSD alternative is Suricata, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 10 alternatives to snort, but unfortunately only two of them are available for BSD. If you can't find an alternative you can try to remove all filters.
Suricata is a high performance Network IDS, IPS and Network Security Monitoring engine. Open Source and owned by a community run non-profit foundation, the Open Information Security Foundation (OISF). Suricata is developed by the OISF and its supporting vendors.
Zeek is a powerful network analysis framework that is much different from the typical IDS you may know.
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