This tool crowdsec.net is really interesting to mitigate and enact defense systems for different scenarios. Source: about 1 year ago

You should check out https://crowdsec.net. More advanced, uses crowdsources cti to block attacks even before they happen. Also both nginx and captcha is supported. Disclaimer: I am head of community. Visit /r/CrowdSec or our Discord at https://discord.gg/crowdsec if you have questions :-). Source: over 1 year ago

Before falling too much in love with Fail2Ban try taking a look at https://crowdsec.net. Similar functionality but way more advanced (but easier to configure). New project that leverages the power of the crowd and shares information of attacks among users so they help each other out protecting themselves. Source: over 1 year ago

You could try out https://crowdsec.net. It’s an advanced FOSS framework for detecting a number of different attacks and not limited to just brute force attacks like Fail2Ban as /u/nonself suggests. The basic concept of CrowdSes is that it reads log, detects attacks, mitigates attacks (CrowdSec integrates directly into the Flask application) and shares information about those attacks with everyone else using... Source: over 1 year ago

Not what you suggested but have you considered https://crowdsec.net? Not just a collaborative and more advanced version of Fail2Ban but in this case you want it because of the collaborative blocklist; we made an article showing that 92% of attacks was blocked in advanced by ip reputation before any attacks were performed. Disclaimer: I am head of community so I might be a bit biased. It’s still a cool FOSS project... Source: over 1 year ago

You’re looking for Security Onion, https://securityonionsolutions.com/. It’s a bunch of integrated tools that will sniff traffic and show alerts. Self hosted, open source, and free. Source: 6 months ago

Grab Security Onion for some blue team tools, try to get Zeek, Wazuh, and Suricata working and look at the output. Source: 11 months ago

If you want a GUI tool try Security Onion. (https://securityonionsolutions.com/). It is essentially zeek & more wrapped up in an easy to use GUI. Source: 11 months ago

Used security onion many years ago. https://securityonionsolutions.com/. Source: over 1 year ago

Active Measures - Includes (IDS/IPS) such as open-source Suricata or Snort on pfSense, and File Integrity Monitoring (FIM), such as the commercial Tripwire and dated, open-source Tripwire, or the open-source Wazuh installed on servers. These can be combined into a Security Information and Event Management (SIEM) system like the open-source solution, Security Onion. Wazuh itself has evolved into a SIEM. Source: over 1 year ago