snort

Open-source network intrusion detection system. More information: https://www.snort.org/#documents.

• Capture packets with verbose output:
  sudo snort -v -i {{interface}}
• Capture packets and dump application layer data with verbose output:
  sudo snort -vd -i {{interface}}
• Capture packets and display link layer packet headers with verbose output:
  sudo snort -ve -i {{interface}}
• Capture packets and save them in the specified directory:
  sudo snort -i {{interface}} -l {{path/to/directory}}
• Capture packets according to rules and save offending packets along with alerts:
  sudo snort -i {{interface}} -c {{path/to/rules.conf}} -l {{path/to/directory}}