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}}