以前听说Vsftpd（very secure ftp daemon)安全，功能强大，就给实验室服务器装上vsftpd了。但全是命令行配置，时常会因一点微小的配置而不能工作，很是麻烦。虽然实验室服务器 的Vsftpd还能战战兢兢的工作，但存在很多让人头疼的问题。比如权限分配、读写等问题，我用用户配置文件很难解决，只好在系统里添加了帐户，让 vsftpd使用。
后来偶尔在Ubuntu的新的立软件包管理（Synaptic Package Manager）里看到proftpd和gproftpd,说明分别如下：
1. proftpd:
Versatile, virtual-hosting FTP daemon
A powerful replacement for wu-ftpd, this File Transfer Protocol
daemon supports hidden directories, virtual hosts, and per-directory
".ftpaccess" files. It uses a single main configuration file, with a
syntax similar to Apache.
Because of the advanced design, anonymous-FTP directories can have
an arbitrary internal structure (bin, lib, etc, and special files are
not needed). Advanced features like multiple password files and
upload/download ratios are also supported.
This package contains most of the core and contributed modules of
proftpd.