スライド 1

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1

2

3

4 WWW Request Client Data Server Request Data Client

5 WWW Request Data Client Server Request Data Client

6 WWW CPU Request Data Client Server Request Data Client

7 Request Client Data Server Request Data Client

8 Single Point of Failure

9

10 Single Point of Failure DNS WEB Accelia Durasite Akamai Server Clients

11 :IRC (1/5) IRC(Internet Relay Chat): CHOCOA: LimeChat: RFC1459 Server 2 Server 1 Client 1 Hi! 1,2,3 Server 4 Hi! Client 2 Server 3 Hi! Client 3 Server 4 Client 4

12 : (2/5) IP URL CPU

13 : (3/5) IP (Anycast) anycast

14 :DNS (4/5) Cache Client Wwwld2.asahi.com Client Uunet3.asahi.com

15 : (5/5 Accelia Durasite Akamai CPU Cache Servers Server Clients

16 P2P

17 P2P Single Point of Failure

18 CPU Wikipedia:

19 HDD Wikipedia:

20

21 P2P Peer P2P

22 P2P Client Server Hybrid P2P Pure P2P WWW, DNS Napstar, Messenger Gnutella, Winny

23 P2P P2P Napster

24 MSN Messenger

25 P2P Napster Napster

26 P2P

27 P2P Single Point of Failure Hybrid P2P

28 P2P 2 P2P Single Point of Failure

29 P2P P2P P2P A B

30 IP

31 P2P IP URI Unstructured Flooding P2P Gnutella, Winny Structured Distributed Hash Table

32 Unstructured P2P Gnutella, Winny P2P

33 Unstructured P2P Time To Live TTL 1 0 Gnutella 7 TTL -1 TTL -1 TTL=0 Peer Peer Peer Source Peer IP TTL

34 Unstructured P2P Unstructured P2P Flooding TTL Structured P2P P2P Winny

35 Structured P2P Unstructured Distributed Hash Table DHT Chord, CAN, Pastry, Tapestry, Kademlia, etc.. DHT BitTorrent, Warez P2P, emule, etc..

36 Wikipedia, Hash Function, A B F(A) F(B

37 Wikipedia, Hash Table,

38 DHT Ion Stoica, Robert morris, David Liben-Nowell, David R. Karger, M. Frans Kaashoek, Frank Dabek, and Hari Balakrishnan, Chord: A Scalable Peer-to-Peer Lookup Protocol for Internet Aplications, IEEE/ACM Trans. Networking, Vol.11, No.1, p , Feb Sylvia Ratnasamy, Paul Francis, Mark Handley, Richard Karp, and Scott Shenker, A Scalable Content-Addressable Network, In Proc. ACM SIGCOMM 2001, August 2001 Antony Rowstron and Peter Druschel, Pastry: Scalable, decentraliszed object location and routing for large-scale peer-to-peer systems, Lecture Note in Computer Science, Vol.2218, pp , Ben Y. Zhao, John Kubiatowicz, and Anthony D. Joseph, Tapestry: An Infrastructure for Fault-tolerant Wide-area Location and Routing, Technical Report UCB/CSD , Computer Science Division, U. C. Berkeley April 2001, 55 Petar Maymounkov and David Mazieres, Kademlia: A Peer-to-peer Information System Based on the XOR Metric, In Proceedings of IPTPS02, Cambridge, USA, March2002

39 P2P Kazaa, Skype DHT

40 Skype NAT P2P ( ) P2P Firewall/NAT NMS Network Management Server Skype(Skype )

41 Skype IP Skype 2 B IP 1 B IP A 3 B

42 P P Winny

43 Winny (P2P ) Winny Unstructured P2P 2002 Winny 2005

44 Winny P2P Winny P2P IP

45 Winny Winny 2 5

46 Winny (FTTH ) (ADSL ) (ISDN )

47 Winny (FTTH ) (ADSL ) (ISDN )

48 1 (FTTH ) (ADSL ) (ISDN )

49 Winny IP Winny IP Winny IP

50 Winny Winny Peer Peer B A C B B A B

51 Winny P2P Peer Peer B C A B C

52 Winny Peer Peer ( ) C A B

53 Winny B A C 1. B File ( ) 2. A File ( ) 3. C, A File B 4. C B, File 5. A C, File A B File

54 Winny B A Cache C File File A B MD5,

55 Winny Unstructured P2P

56 Winny

57

58 IP Source 10Mbps 10Mbps 10Mbps 10Mbps IP

59 Source

60 Source 10Mbps 20Mbps 10Mbps 20Mbps 30Mbps

61 RTT Round Trip Time

62 Narada DVMRP

63 Layered Coding Network Coding Source Relay Relay

64 P2P

65 P2P P2P P2P /

66 P2P itunes Music Store 99 Skype Skype

67 P2P

68 P2P Grid Power Grid CPU HDD CPU

69 OceanStore (1 PB) P2P P2P

70 SETI Search for Extra- Terrestrial Intelligence: CPU 39 ( )

71 All IP Computing (CPU, Memory, DISK, Display, Keyboard, Mouse ) IP Display IP

72 All IP Computing iscsi( USB/IP Project ( AnywhereUSB ( ( ) IP/UDP/TCP/AnyL4 IP (ryuji@sfc.wide.ad.jp)

73 7000 QoS P2P 11:59PM SOI /WEB

1 DHT Fig. 1 Example of DHT 2 Successor Fig. 2 Example of Successor 2.1 Distributed Hash Table key key value O(1) DHT DHT 1 DHT 1 ID key ID IP value D

1 DHT Fig. 1 Example of DHT 2 Successor Fig. 2 Example of Successor 2.1 Distributed Hash Table key key value O(1) DHT DHT 1 DHT 1 ID key ID IP value D P2P 1,a) 1 1 Peer-to-Peer P2P P2P P2P Chord P2P Chord Consideration for Efficient Construction of Distributed Hash Trees on P2P Systems Taihei Higuchi 1,a) Masakazu Soshi 1 Tomoyuki Asaeda 1 Abstract:

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