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  1. 1. BitTorrent Mahesh Mohan M.U, CS4
  2. 2. Outline  What is BitTorrent Protocol?, How it works?  Terminologies  How to download files using Torrent? Torrent search sites Torrent clients
  3. 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. 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. 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. 6. BitTorrent Network
  7. 7. Terminology  Torrent  Peer  Seed  Tracker  Leecher  Swarm
  8. 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. 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. 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. 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. 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. 13. Swarm  The group of machines that are collectively connected for a particular file.
  14. 14. 1. Download the torrent file
  15. 15. 2. Contact the tracker
  16. 16. 3. Tracker response
  17. 17. 4. Peer connection
  18. 18. 5. Peer 'A' downloads a piece from the network
  19. 19. 6. Piece exchange starts
  20. 20. 7. Peers periodically contact tracker
  21. 21. Visualization of the working of BitTorrent Visualization
  22. 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. 23. BitTorrent Clients  Deluge(  Transmission(  KTorrent(  Vuze(  qBittorrent(
  24. 24. Deluge in action
  25. 25. Torrent search sites  Legal Torrents  Legit Torrents   
  26. 26. Thanks for hearing me patiently!
  27. 27. Credits Slides created using Powered by GNU/Linux Operating System Thanks Google Picasa for pictures
  28. 28. Questions?
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