December 2025
Intermediate to advanced
704 pages
19h 14m
English
Content preview from Ubuntu Linux Bible, 11th Edition
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CHAPTER 18Configuring an FTP Server
The File Transfer Protocol (FTP) is one of the oldest protocols in existence for sharing files over networks. Although there are more secure protocols for network file sharing, FTP is still sometimes used for making files available on the Internet.
Several FTP server projects are available with Linux today. However, the one often used with Ubuntu and other Linux distributions is the Very Secure FTP Daemon (vsftpd package). This chapter describes how to install, configure, use, and secure an FTP server using the vsftpd package.
Understanding FTP
FTP operates in a client/server model. An FTP server daemon listens for incoming requests on TCP port 21 from FTP clients. The client presents a login and password. If the server accepts the login information, the client can interactively traverse the filesystem, list files and directories, and then download (and sometimes upload) files.
What makes FTP insecure is that everything sent between the FTP client and server is done in clear text. The FTP protocol was created at a time when most computer communication was done on private lines or over dial-up, where encryption was not thought to be critical. If you use FTP over a public network, someone sniffing the line anywhere between the client and server would be able to see not ...
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