Illustrated TCP/IP by Matthew G. Naugle Wiley Computer Publishing, John Wiley & Sons, Inc. ISBN: 0471196568   Pub Date: 11/01/98

Chapter 224
FTP Data Transfer

C:\WINDOWS>ftp
ftp> open mnauglepc
Connected to mnauglepc.
220 mnauglepc FTP service (NEWT v4.01)
ready for new user.
User (mnauglepc:(none)): mnaugle
331 mnaugle, please enter your password.
Password:
230 User mnaugle logged in.
ftp> pwd
257 “c:\” is the current directory.
ftp> lcd
Local directory now C:\WINDOWS
ftp> get autoexec.bat autoexec.002
200 PORT command successful.
150 Opening ASCII mode data connection
for autoexec.bat.
226 File transfer complete.
1911 bytes received in 0.00 seconds
(1911000.00 Kbytes/sec)
ftp> bye
221 Goodbye.

Refer to the slide. Commands such as the following are sent over the control port. Once the connection is established, file transfer actually occurs over the data port. If a user wants to establish an FTP connection between 148.1.1.2 and an FTP server process on 148.1.1.19, the following sequence of events take place on a DOS PC (for other operating systems, the prompt would change, but the commands are all the same in every FTP implementation):

C> FTP or FTP <domain name or IP address>

If multiple files are needed, the user can use the commands MGET or MPUT, which stands for Multiple GET and Multiple PUT, respectively. If the file we want is a binary file (a spreadsheet and an application are examples of binary files), the user has to type in the keyword binary at the FTP prompt. This indicates to the FTP program that the file to be transferred is a binary file. Any of the commands may be entered at the FTP prompt. The protocol is transaction based and the numbers preceding each line are for the node to interpret the next command. The text is for human consumption.

C:\WINDOWS>ftp

ftp> open mnauglepc

Connected to mnauglepc.

220 mnauglepc FTP service (NEWT v4.01) ready for new user.

User (mnauglepc:(none)): mnaugle

331 mnaugle, please enter your password.

Password:

230 User mnaugle logged in.

ftp> pwd

257 “c:\” is the current directory.

ftp> lcd

Local directory now C:\WINDOWS

ftp> get autoexec.bat autoexec.002

200 PORT command successful.

150 Opening ASCII mode data connection for autoexec.bat.

226 File transfer complete.

1911 bytes received in 0.00 seconds (1911000.00 Kbytes/sec)

ftp> bye

221 Goodbye.