Hiding IDs - YES

ftp> ls

---> TYPE A
200 Switching to ASCII mode.
ftp: setsockopt (ignored): Permission denied
---> PORT 10,10,14,4,223,101
200 PORT command successful. Consider using PASV.
---> LIST
150 Here comes the directory listing.
-rw-rw-r--    1 ftp     ftp      8138592 Sep 14 16:54 Calender.pptx
drwxrwxr-x    2 ftp     ftp         4096 Sep 14 17:03 Clients
drwxrwxr-x    2 ftp     ftp         4096 Sep 14 16:50 Documents
drwxrwxr-x    2 ftp     ftp         4096 Sep 14 16:50 Employees
-rw-rw-r--    1 ftp     ftp           41 Sep 14 16:45 Important Notes.txt
-rw-------    1 ftp     ftp            0 Sep 15 14:57 testupload.txt
226 Directory send OK.

This setting is a security feature to prevent local usernames from being revealed. With the usernames, we could attack the services like FTP and SSH and many others with a brute-force attack in theory. However, in reality, fail2ban solutions are now a standard implementation of any infrastructure that logs the IP address and blocks all access to the infrastructure after a certain number of failed login attempts.

Another helpful setting we can use for our purposes is the ls_recurse_enable=YES. This is often set on the vsFTPd server to have a better overview of the FTP directory structure, as it allows us to see all the visible content at once.