Vitux published a tutorial on Snort, a network intrusion detection system.

Snort – A Network Intrusion Detection System for Ubuntu

Snort is a well-known open-source network intrusion detection and prevention system (IDS). Snort is very useful to monitor the package sent and received through a network interface. You can specify the network interface to monitor the traffic flow.

Snort – A Network Intrusion Detection System for Ubuntu – VITUX