Which command should be used on the Cisco FTD CLI to capture all the packets...

Reason: the command "capture-traffic" is used for SNORT Engine Captures. To capture a LINA Engine Capture, you use the "capture" command. Since the Lina Engine represents the actual physical interface of the device, "capture" is the only reasonable choice Reference:https://www.cisco.com/c/en/us/support/ docs/security/firepower-ngfw/212474-working-with-firepower-threat-defense-f.html#anc10

The command is

firepower# capture DMZ interface dmz trace detail match ip host 192.168.76.14 host 192.168.76.100

firepower# capture INSIDE interface inside trace detail match ip host 192.168.76.14 host 192.168.75.14