臺灣博碩士論文加值系統

　　鑑於目前網路交通量測工具程式為了量測網路交通情況，往往傳送多數的量測樣本封包，以達到統計上的精確度，這樣可能造成將來網路上充斥著網路交通量測封包，佔據一定程度的頻寬。為避免這種情況，這裡提出結合SNMP（Simple Network Management Protocol）的方式來查詢網路交通情況，目標是想以最少數的封包來完成查詢網路交通的資訊。為了達成以少量的封包完成獲取網路交通狀況資訊的目標，代理伺服器的概念在本文所提的系統中採用。
　　由於多數ISP網路管理人員均傾向不開放其自己的SNMP網管資訊給非該領域之網管人員或一般使用者，我們認為直接以量測工具取得SNMP網管資訊並不容易。因此本文的第一個貢獻是可以跨網域來獲得各個不同管理網域的SNMP網管資料。
　　利用ICMP封包量測封包遺失率時，無法判定封包是在上傳或是下載的路徑中遺失。這裡所提出的分散式伺服器架構，可以改善此項一般量測工具功能之不足，經由伺服器間彼此合作，分別找出上傳與下載路徑中的封包遺失率，為本文所提設計的第二個貢獻。
　　本論文所設計並完成製作之服務品質查詢系統的創新之處在於代理式查詢方式，自動尋取服務品資資訊之功能，並以多個分散式代理伺服器架構完成，以期獲取網路交通資訊過程中，傳送最少的封包，並對網路交通狀態有最少的影響。

第一章 　緒論1
第二章 　系統架構設計7
2.1 設計目標8
2.2 代理伺服器式之服務品質查詢系統架構9
2.2.1 系統架構9
2.2.2 架構的組成11
2.3 服務品質查詢代理伺服器13
2.3.1 服務品質資訊查詢模組14
2.3.2 尋徑模組20
2.3.3 服務品質域名系統模組22
2.3.4 資訊交換模組27
2.3.5 效能評估及解譯模組29
第三章 　服務品質分析與應用31
3.1 服務品質資訊32
3.1.1 封包傳送延遲時間32
3.1.2 封包遺失率32
3.1.3 網路實體頻寬34
3.1.4 路徑最大封包傳送單位34
3.2 預估TCP交通傳輸率35
3.3 服務品質尋取系統之應用53
3.3.1 應用於分級服務網路53
3.3.2 自動詢價的應用56
3.3.3 域名代理伺服器（DNS Proxy）動態指定網址之應用56
3.3.4 網路使用者行為統計之應用57
第四章 　實作結果59
第五章 　結論67
參考文獻69

[1] W. R. Stevens, UNIX Network Programming, Prenticd-Hall, 1990.
[2] V. Jacobson, et al. traceroute, 1988.
[3] InSoft, International Network Services, "Net Medic program," http://-www.vitalsigns.com/netmedic/indexes/freedown_index.html.
[4] PY Software, Inc., "Any Speed program," http://www.pysoft.com/-anyspeed_fr.html.
[5] Datametrics Systems Corporation, "VisualRoute program," http://-www.visualroute.com/download.html.
[6] Dephi Junkie, "Ping Plotter program," Nessoft, http://www.nessoft.com-/downloads/pngplt_2.exe.
[7] NeoWorx Inc., "NeoTrace program," http://www.neoworx.com/neotrace-/download.asp
[8] V. Jacobson, "pathchar - a tool to infer characteristics of Internet paths," Lawrence Berkeley National Laboratory, Apr. 1997.
[9] 蔡建良, "Qosd program," http://eagle.ee.ntu.edu.tw/research/qos-surf/qosd-1.0-solaris2-sparc.tar.gz
[10] 蔡建良，"網際網路服務品質量測系統之設計與實作"，台灣大學電機工程研究所碩士論文，中華民國八十七年六月。
[11] W. R. Stevens, TCP/IP Illustrated Volume 1: The Protocols, Addison Wesley, 1994.
[12] W. R. Stevens, TCP/IP Illustrated Volume 2: The Implementation, Addison Wesley, 1995.
[13] W. R. Stevens, TCP/IP Illustrated Volume 3: The Application, Addison Wesley, 1997.
[14] K. McCloghrie, M. Rose, "Management Information Base for network management of TCP/IP-based internets: MIB-I," RFC 1156, May 1990.
[15] M. Rose, K. McCloghrie, "Concise MIB Definitions," RFC 1212, March 1991.
[16] K. McCloghrie, M. Rose, "Management Information Base for Network Management of TCP/IP-based internets: MIB-II," RFC 1213, Mar. 1991.
[17] K. McCloghrie, R. Fox, "IEEE 802.4 Token Bus MIB," RFC 1230, May 1991.
[18] K. McCloghrie, R. Fox, E. Decker, "IEEE 802.5 Token Ring MIB," RFC 1231, May 1991.
[19] S. Waldbusser, "Remote Network Monitoring Management Information Base," RFC 1271, Nov. 1991.
[20] F. Kastenholz, "Implementation Notes and Experience for the Internet Ethernet MIB," RFC 1369, Oct. 1992.
[21] J. Barnes, L. Brown, R. Royston, S. Waldbusser, "Modem Manage-ment Information Base (MIB) using SMIv2," RFC 1696, Aug. 1994.
[22] J. Flick, "IEEE 802.12 Interface MIB," RFC 2030, Oct. 1996.
[23] M. Greene, J. Luciani, K. White, T. Kuo, "Definitions of Managed Objects for Classical IP and ARP Over ATM Using SMIv2 (IPOA-MIB)," RFC 2320, Apr. 1998.
[24] K. Tesink, "Definitions of Managed Objects for ATM Management," RFC 2515, Feb. 1999.
[25] J. Davin, "mit-snmp," Massachusetts Institute of Technology, 1989.
[26] P. Albits, C. Liu, DNS and BIND, O''Reilly & Associates, 1992.
[27] M. Steven, F. Sally, "NS (Network Simulator)," 1995. http://www.nrg.ee.-lbl.gov/ns.
[28] K. Fall, S. Floyd, "Simulation-based Comparisons of Tahoe, Reno, and SACK TCP," ACM SIGCOMM, Computer Communication Review.
[29] J. Touch, J. Heidemann, K. Obraczka, "Analysis of HTTP Performance," released as Web page http://www.isi.edu.tw/lsam-/publications/http-perf/, June 1996.
[30] J. Heidemann, "Performance Interactions Between P-HTTP and TCP Implementations," ACM Computer Communication Review, vol.27, pp. 65-73, April 1997.
[31] J. Heidemann, K. Obraczka, J. Touch, "Modeling the Performance of HTTP Over Several Transport Protocols," IEEE/ACM Transactions on Networking, Vol. 5, No. 5, Oct. 1997.
[32] T. V. Lakshman, Upamanyu Madhow, "The Performance of TCP/IP for Networks with High Bandwidth-Delay Products and Random Loss," IEEE/ACM Transactions on Networking, Vol. 5, No. 3, Jun. 1997.
[33] A. Kumar, "Comparative Performance Analysis of Versions of TCP in a Local Network with a Lossy Link," IEEE/ACM Transactions on Networking, Vol. 6, No. 4, Aug. 1998.
[34] V. Paxson, J. Mahdavi, A. Adams, M. Mathis, "An Architecture for Large-Scale Internet Measurement," IEEE Communications Magazine, pp. 48-54, August 1998.
[35] M. Mathis, J. Semke, J. Mahdavi, T. Ott, "The Macroscopic Behavior of the TCP Congestion Avoidance Algorithm," ACM Computer Communication Review, pp. 67-82, July 1997.
[36] J. Padhye, V. Firoiu, D. Towsley, J. Kurose, "Modeling TCP Throughput: A Simple Model and its Empirical Validation," ACM SIGCOMM''98, Computer Communication Review, pp. 303-314.
[37] K. Nichols, V. Jacobson, L. Zhang, "A Two-bit Differentiated Services Architecture for the Internet," ftp://ftp.ee.lbl.gov/papers-/dsarch.pdf, November 1997.
[38] K. Nichols, S. Blake, F. Baker, D. Black, "Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers," RFC 2474, December 1998.
[39] S. Blake, D. Black, M. Carlson, E. Davies, Z. Wang, W. Weiss, "An Architecture for Differentiated Services," RFC 2475, December 1998.