vsftpd 綁定IP,只對內網開放，更安全。

在vsftpd.conf文件中加入:

listen_address=192.168.102.253

查詢配置細節:
man vsftpd.conf

listen_address
    If vsftpd is in standalone mode, the default listen address (of all local interfaces) may be  overridden  by  this
    setting. Provide a numeric IP address.

    Default: (none)