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Understanding TCP/IP

You're reading from   Understanding TCP/IP A clear and comprehensive guide to TCP/IP protocols

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Product type Paperback
Published in May 2006
Publisher Packt
ISBN-13 9781904811718
Length
Edition 1st Edition
Concepts
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Author (1):
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CP Books a.s. CP Books a.s.
Author Profile Icon CP Books a.s.
CP Books a.s.
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Toc

Table of Contents (20) Chapters Close

Preface 1. Introduction to Network Protocols FREE CHAPTER 2. Network Monitoring Tools 3. Physical Layer 4. Link Layer 5. Internet Protocol 6. IP Address 7. Routing 8. IP Version 6 9. Transmission Control Protocol 10. User Datagram Protocol 11. Domain Name System 12. Telnet 13. File Transfer Protocol 14. Hypertext Transfer Protocol 15. Email 16. Forums 17. Lightweight Directory Access Protocol A. CISCO Routers Index

13.2 Active Mode of FTP Protocol Communication

Active mode is the basic mode of FTP protocol communication. The most frequently asked question is how the user can influence the option of the communication mode. The answer is hard to give because an FTP client developer must enable this option. Only some clients have such an option; Linux clients support the proxy command, but Windows clients doesn’t support the proxy command. On the other hand, most Internet browsers use passive mode. However, servers usually support both communication modes.

At first, we will briefly show a scenario of active communication in the following table:

Step

FTP communication

1.

C:\WINDOWS\system32>ftp ftp.ripe.net

Connected to hawk-ftp.ripe.net.

220 FTPD Server (RIPE NCC FTP server)

2.

User (hawk-ftp.ripe.net:(none)): anonymous

331 Anonymous login ok, send your complete email address as your password.

3.

Password:

4.

230-Welcome 194.149.105.131,

230-

230-This is the ftp-server...

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