Connections and Limits Options
tcp_wrappers

If enabled, and vsftpd was compiled with tcp_wrappers support, incoming connections will be fed through tcp_wrappers access control.

Furthermore, there is a mechanism for per-IP based configuration.

If tcp_wrappers sets the VSFTPD_LOAD_CONF environment variable, then the vsftpd session will try and load the vsftpd configuration file specified in this variable.

default=NO