WIDE 1

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1 WIDE 1

2 2 Web Web Web Web Web Web Web Web Web Web? Web Web

3 Things to cover Web Web Web Web Caching Proxy 3

4 Things NOT covered / How to execute Perl Scripts as CGI binaries on Windows NT How to avoid access to hidden pages... And such 4

5 Web TSS TSS? URL Web Web DNS, NetNews,, Mail,... 5

6 Web Web Web CGI, SSI, SHTML,... Java, JavaScript, ActiveX, Dynamic HTML,... 6

7 7

8 WWW GET method Web Web URI URI URI TinyHTTPD: : HTTP/1.0, GET POST Perl inka.de/.de/~bigred/sw/ 8

9 URL (Remote Redirection) URI (Aliasing Aliasing) ACL ( ( / URI) User Authentication Virtual Hosting (Virtual Server) 9

10 fork fork fork fork + fork fork (e.g.: Squid in http-accelerator mode) 10

11 (1) Web DNS etc., etc.,... 11

12 12 (2) (2) ( v.s. v.s. Web Web CP CP IWE96 IWE96

13 (3) LAN / WAN: 28.8Kbps 10 10Mbps... 5KB 1KB/sec KB/sec 1 5KB / ( 1KB/sec) = 5 sec

14 (4) 14

15 15 CGI CGI BSDI/16

16 16 RPC/ RPC/ Web Web duration duration latency latency

17 17

18 18 sticky bit sticky bit Web Web

19 CPU,,,... 19

20 20 Web Web

21 Web Web WebStone sgi.com/products/.com/products/webforce/webstone/ 2.01 SPECweb specbench.org/.org/osg/web96/ SPECweb SPECweb

22 Web SPECweb96 (1) 22

23 Web SPECweb96 (2) 23

24 Web SPECweb96, so? SPECweb

25 25 Web Web (1) (1) baseline baseline v.s. v.s. v.s. v.s.

26 Web (2 (2) HTTP Per-connection forking H/W H/W S/W S/W 26

27 Web (3) RAID RAID5 RAID graceful degradation 27

28 Web (4) TCP/IP e.g.: Solaris TCP/IP CGI 28

29 URL) (plain and CGI) (h/w h/w s/w) 29

30 30

31 Web (1) CGI HTTP HTTP... HTTP (e.g. ftp) e.g.: 31

32 32 Web Web (2) (2) CGI CGI CGI CGI chroot chroot CGI CGI

33 33 Web Web (3) (3) PUT PUT PUT & SSI PUT & SSI PUT PUT PUT PUT SSI SSI PUT PUT SSI SSI GET GET PUT PUT GET GET / GET GET PUT PUT PUT PUT SSI SSI PUT PUT SSI SSI

34 Web (4) Intranet 34

35 35 Web Web (5 (5) Intranet Intranet FW FW mime-type mime-type?

36 36 Web Web listen listen

37 37 Web Web

38 WWW WWW!!! URL Simple document retrieval OK OK CGI, SSI,, TCP 38

39 Brute force Divide and conquer By request By function By content by-function 39

40 H/W 40

41 Web CGI CGI?? Document root? Path to executables? Path to Binary system programs?? 41

42 Web Web 42

43 Web Web 43

44 DNS 44

45 45 TCP TCP (1) (1) TCP TCP? The Internet Connction Dispatcher Server Array

46 TCP (2) CISCO: LocalDirector NAT IBM: TCP Router SP2 : MAC JAIST: TCP Router IP Others (Commercial & Free) 46

47 47 TCP TCP (3) (3) TCP TCP +

48 TCP (4) NAT ftp http with hidden state (e.g.: cookie) 48

49 Local Director Totally Reliable Fully Redundant Fault Tolerant TCP Servers Mail, Web, FTP etc. LocalDirector Mirrored Data Servers 49

50 50

51 51

52 FQDN FQDN FQDN (jp jp, uk,, au,...) Result japan.park.org jp domain Redirected query Redirection to japan.park.org DNS Reverse Lookup Original query park.org 52

53 53 FQDN FQDN : CGI CGI : com/org/net com/org/net FQDN FQDN

54 54 R CP CP R CP R CP Metric Query

55 55 : : RTT RTT

56 DistributedDirector 1:client clientdd DD server 2:DD DDDRP Agent 3: 4:client client 5 DistributedDirector DRP Agents Internet 1

57 IBM s s Atlanta Olympic Server ping ping : : RTT RTTping 57

58 WWW WWW HTTP Internet HTTP HTTP-NG??? 58

59 HTTP Request Request TCP (?) Keep-Alive GET /~osamu/ ~osamu/ / HTTP/1.0 Connection: Keep-Alive Cookie 59

60 HTTP Internet HTTP 12KB 2KB TCP Keep-Alive T/TCP HTTP/1.0 -> HTTP/1.1 TCP -> T/TCP 60

61 61 & Web Web QoS QoS HTTP HTTP :......

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untitled 2 1 Web 3 4 2 5 6 3 7 Internet = Inter Network 8 4 B B A B C A B C D D 9 A G D G F A B C D F D C D E F E F G H 10 5 11 Internet = Inter Network PC 12 6 1986 NSFNET 1995 1991 World Wide Web 1995 Windows95