FTP proxy program with the following features: * Active as well as passive FTP transfers * Logging of connection attempts * Access control features * If run as root, it drops the privileges as often as possible * You can pretend to run a real ftp server * User specific forward features * Specify how many users are allowed to log in from which IP ranges * The throughput rate can be throttled * Various login strings are possible * Regular users can run the proxy server on unprivileged ports as well