this value to YES. This directive cannot be used in conjunction with the listen_ipv6 directive.The default value is NO.• listen_ipv6 — When enabled, vsftpd runs in stand-alone mode, but listens only to IPv6sockets. This directive cannot be used in conjunction with the listen directive.The default value is NO.• session_support — When enabled, vsftpd attempts to maintain login sessions for eachuser through Pluggable Authentication Modules (PAM). Refer to Chapter 16, PluggableAuthentication Modules (PAM) for more information. If session logging is not necessary,disabling this option allows vsftpd to run with less processes and lower privileges.The default value is YES.5.2. Log In Options and Access ControlsThe following is a list of directives which control the login behavior and access controlmechanisms.• anonymous_enable — When enabled, anonymous users are allowed to log in. Theusernames anonymous and ftp are accepted.The default value is YES.Refer to Section 5.3, “Anonymous User Options” for a list of directives affecting anonymoususers.• banned_email_file — If the deny_email_enable directive is set to YES, this directivespecifies the file containing a list of anonymous email passwords which are not permittedaccess to the server.The default value is /etc/vsftpd.banned_emails.• banner_file — Specifies the file containing text displayed when a connection is establishedto the server. This option overrides any text specified in the ftpd_banner directive.There is no default value for this directive.• cmds_allowed — Specifies a comma-delimited list of FTP commands allowed by the server.All other commands are rejected.There is no default value for this directive.• deny_email_enable — When enabled, any anonymous user using email passwordsspecified in the /etc/vsftpd.banned_emails are denied access to the server. The name ofthe file referenced by this directive can be specified using the banned_email_file directive.Log In Options and Access Controls283
