vsftpd - FTP-Server anonymous only

#
# very simple anonymous FTP server configuration
#
# Mandatory directives
#
listen=YES
local_enable=NO
anonymous_enable=YES
write_enable=NO
anon_root=/srv/ftp
#
# Optional directives
#
anon_max_rate=2048000
xferlog_enable=YES
listen_address=123.123.123.123
listen_port=21