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% ftp ds218plus
Connected to ds218plus.mydomain.com.
220 DS218Plus FTP server ready.
Name (ds218plus:j5): ftp
331 Guest login ok, send your email address as password.
Password: 
230 Guest login ok, access restrictions apply.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
229 Entering Extended Passive Mode (|||55703|)
150 Opening BINARY mode data connection for 'file list'.
drwxrwxrwx   1 root     root             4096 Sep 16 10:58 usbshare1
dr-xr-xr-x   1 root     root              142 May  9 14:48 web
drwxr-xr-x   1 root     root               38 Aug 18 22:21 docker

Whoa there! I should only see the directory for Anonymous FTP, not a list of shares. What’s more, I could download files from these directories even though they were never intended to be public.

The first step is disable advanced permissions on whichever directory you want to use for Anonymous FTP. In my case, the share was called ‘public’:

After doing that, I can manually select the share to use for Anonymous FTP: