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crowdsec
CrowdSec - the open-source and participative security solution offering crowdsourced protection against malicious IPs and access to the most advanced real-world CTI.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
There's finally a port out for OPNsense. Get it here. By default it's able to protect ssh and web logins on OPNsense itself - but it's a full client so it can do much more if you want it. Or you can just install the bouncer port and have the agent running on a separate server if you have a more distributed environment. It's still in beta but it should work fine. If you have any problems, please ask in #-bsd on the CrowdSec Discord.
CrowdSec can be seen as a modern version of Fail2Ban that parses logs and detect attacks. The really cool part about CrowdSec is that users of CrowdSec share data on attacks they're seeing, thereby helping each other out.