Once you start the Suricata, it will log all the alerts into /var/log/suricata/eve.json and several other logs in the same directory. The suricata-updatecan be run periodically by cron, keeping the rules up to date with the ever evolving world of attacks. If you check the help for the script, there's a way to add around a dozen of other sources. There are dozens of various free and payed rule sets, the most used free set is the Emerging threats, it's usually bundled together with the suricata and it's the default set for the suricata-update. The another part of the puzzle is the suricata-update script that pulls set of rules from the internet and assembles a rule set for the suricata. That's not all, the suricata can also log DNS requests, expired TLS ceritificates in the communication, etc.Īs the security threats are always evolving, the rules for matching malicious data has to evolve too and therefore we have to periodically fetch the update. Optionally also the raw packet data can be attached to the log for further analysis by a security team. If the packet matches any enabled rule a log entry is created (with details like source/destination IP, protocol, rule that was triggered, rule description, severity of the captured packet (info/network breach.)). The working principle is simple: Suricata listens on one or multiple network interfaces and analyzes the incoming packets, the packets are matched against a set of rules describing what data we are interested in. The Suricata IMHO the most popular solution today as it's multithreaded and uses a same format of the rules as the Snort.

There are multiple implementations of NIDS (Network intrusion detection system), e.g. The IDS is a system that monitors network traffic for malicious activity like botnets talking to command servers and policy violations (e.g. It today's world of cyber attacks it can be used as a network monitoring device with an IDS (Intrusion detection system) capability. The Turris router is a very interesting linux-based networking device with plenty of computing power, it would be pity to use it only as a regular OpenWRT router.

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