Seminar slide on BitTorrent

1. BitTorrent
Mahesh Mohan M.U, CS4

2. Outline
 What is BitTorrent Protocol?, How it works?
 Terminologies
 How to download files using Torrent?
Torrent search sites
Torrent clients

3. FTP(File Transfer protocol)
 Client-Server Model
 Central server store the files
 Large traffic to the server will lead to download
failure
 Shortcomings of FTP makes people to think
over traditional FTP

4. What is BitTorrent?
 P2P(Peer To Peer) file transfer protocol
 Transfer of large files
 Files are shared by many users
 Active participation of all users
 Huge success in file sharing domain since 2003

5. How it works?
 To share the data using BitTorrent we must
have:-
 Tracker server, a file with .'torrent' extension,
complete copy of the file being shared
 .torrent file conatins data which is essential for
the protocol to function- file length, file name,
information about the tracker
 When we open .'torrent' file in client, it will
connect to the client and start downloading

6. BitTorrent Network

7. Terminology
 Torrent
 Peer
 Seed
 Tracker
 Leecher
 Swarm

8. Torrent
 This refers to the small metadata file you
receive from the web server (the one that ends
in .torrent.) Metadata here means that the file
contains information about the data you want to
download, not the data itself.

9. Peer
 A peer is another computer on the internet that
you connect to and transfer data. Generally a
peer does not have the complete file.

10. Leecher
 They are similar to peers in that they won’t
have the complete file. But the main difference
between the two is that a leech will not upload
once the file is downloaded.

11. Seed
 A computer that has a complete copy of a
certain torrent. Once a client downloads a file
completely, he can continue to upload the file
which is called as seeding. This is a good
practice in the BitTorrent world since it allows
other users to have the file easily.

12. Tracker
 A server on the Internet that acts to coordinate
the action of BitTorrent clients. The clients are
in constant touch with this server to know about
the peers in the swarm.

13. Swarm
 The group of machines that are collectively
connected for a particular file.

14. 1. Download the torrent file

15. 2. Contact the tracker

16. 3. Tracker response

17. 4. Peer connection

18. 5. Peer 'A' downloads a piece
from the network

19. 6. Piece exchange starts

20. 7. Peers periodically contact
tracker

21. Visualization of the working of
BitTorrent
Visualization

22. Download files using BitTorrent
 First download a Torrent client to do us the job
of downloading the files
 Then, go to a good Torrent search engine
 Download the file with '.torrent' extension
 Open it in your client
 If the download starts with the progress bar
moving, take a deep breath!

23. BitTorrent Clients
 Deluge(http://deluge-torrent.org)
 Transmission(http://transmissionbt.com)
 KTorrent(http://ktorrent.org)
 Vuze(http://azureus.sourceforge.net/)
 qBittorrent(http://www.qbittorrent.org/)

24. Deluge in action

25. Torrent search sites
 Legal Torrents
 Legit Torrents
 http://torrentz.com
 http://piratebay.org
 http://mininova.com

26. Thanks for hearing me patiently!

27. Credits
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28. Questions?