CS5412: TORRENTS AND TIT-FOR-TAT

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36 Why is (studying) BitTorrent important? BitTorrent consumes significant amount of internet traffic today In 2004, BitTorrent accounted for 30% of all internet traffic (Total P2P was 60%), according to CacheLogic Slightly lower share in 2005 (possibly because of legal action), but still significant BT always used for legal software (linux iso) distribution too Recently: legal media downloads (Fox) <strong>CS5412</strong> Spring 2012 (Cloud Computing: Birman)
37 Example finding from a recent study Gribble showed that most BitTorrent streams “fail” He found that the number of concurrent users is often too small, and the transfer too short, for the incentive structure to do anything No time to “learn” His suggestion: add a simple history mechanism Behavior from yesterday can be used today. But of course this ignores “dynamics” seen in the Internet... <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 and 34: 33 Pros and cons of BitTorrent Dep
Page 35: 35 Prior to Netflix “explosion”
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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