more concurrent users and $129 for up to 50 concurrent users, but free to education insti-
tutions with a compliant domain name).
NOTE
Do not confuse the
ncftp client with ncftpd. The ncftp-3.1 package included with
Ubuntu is the client software, a replacement for
ftp-0.17, and includes the ncftpget
and ncftpput commands for transferring files via the command line or by using a
remote file uniform resource locator (URL) address.
ncftpd is the FTP server, which
can be downloaded from www.ncftpd.com.
Another FTP server package for Linux is ProFTPD, licensed under the GNU GPL. This
server works well with most Linux distributions and has been used by a number of Linux
sites, including ftp.kernel.org and ftp.sourceforge.net. ProFTPD is actively maintained and
updated for bug fixes and security enhancements. Its developers recommend that you use
the latest release (1.2.10 at the time of this writing) to avoid exposure to exploits and
vulnerabilities. Browse to http://www.proftpd.org to download a copy.
Yet another FTP server package is
Bsdftpd-ssl, which is based on the BSD ftpd (and
distributed under the BSD license).
Bsdftpd-ssl offers simultaneous standard and secure
access using security extensions; secure access requires a special client. For more details,
browse to http://bsdftpd-ssl.sc.ru.
Finally, another alternative is to use Apache (and the HTTP protocol) for serving files.
Using a web server to provide data downloads can reduce the need to monitor and main-
tain a separate software service (or directories) on your server. This approach to serving
files also reduces system resource requirements and gives remote users a bit more flexibil-
ity when downloading (such as enabling them to download multiple files at once). See
Chapter 20, “Apache Web Server Management,” for more information about using
Apache.
Installing FTP Software
As part of the standard installation, the client software for FTP is already installed. You
can verify that FTP-related software is installed on your system by using dpkg,
grep, and
sort commands in this query:
$ dpkg --get-selections | grep ftp | sort
The example results might differ, depending on what software packages are installed. In
your Ubuntu file system, you will find the file
/usr/bin/pftp symbolically linked to
/usr/bin/netkit-ftp as well as the vsftpd server under the /usr/sbin directory. Other
installed packages include additional text-based and graphical FTP clients.
If
vsftpd is not installed, you can install it through Synaptic.
CHAPTER 23 Remote File Serving with FTP
548

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