FTP Inspection in ASA

This chapter already promoted a quick review of FTP modes of operation during the study of the IOS ZFW. This section focuses on ASA’s inspection capabilities for this application protocol.

Example 12-23 simply characterizes that ASA has visibility of events such as file retrieval using FTP Active mode. It is interesting to observe that the Syslog messages reveal the creation of both the control and data connections, respectively on TCP ports 21 and 20.