CS5412: TORRENTS AND TIT-FOR-TAT

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34 “Trackerless” BitTorrent To be more precise, “BitTorrent without a centralizedtracker” E.g.: Azureus Uses a Distributed Hash Table (Kademlia DHT) Tracker run by a normal end-host (not a web-server anymore) The original seeder could itself be the tracker Or have a node in the DHT randomly picked to act as the tracker <strong>CS5412</strong> Spring 2012 (Cloud Computing: Birman)
35 Prior to Netflix “explosion”, BitTorrent dominated the INternet! (From CacheLogic, 2004) <strong>CS5412</strong> Spring 2012 (Cloud Computing: Birman)
Page 1 and 2: Lecture VI CS5412: TORRENTS AND TIT
Page 3 and 4: 3 The basic BitTorrent Scenario Mi
Page 5 and 6: 5 Source Router “Interested” En
Page 7 and 8: 7 Client-Server Source Router “In
Page 9 and 10: 9 End-host based multicast Source R
Page 11 and 12: 11 End-host based multicast Also c
Page 13 and 14: 13 End-host multicast using single
Page 15 and 16: 15 End-host multicast using single
Page 17 and 18: 17 BitTorrent Swarm Swarm Set of
Page 19 and 20: Peer How a node enters a swarm for
Page 21 and 22: Peer How a node enters a swarm for
Page 23 and 24: 23 Terminology Seed: peer with the
Page 25 and 26: 25 Choosing pieces to request Rand
Page 27 and 28: 27 Tit-for-tat as incentive to uplo
Page 29 and 30: 29 Why BitTorrent took off Better
Page 31 and 32: 31 Pros and cons of BitTorrent Pro
Page 33: 33 Pros and cons of BitTorrent Dep
Page 37 and 38: 37 Example finding from a recent st
Page 39 and 40: 39 Basic strategy They assume cryp
Page 41 and 42: 41 Obvious concern: Failed key exch
Page 43 and 44: 43 Insights gained? Collaborative

CS5412: TORRENTS AND TIT-FOR-TAT

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