以點對點為基礎之服務品質監測系統

A P2P-based QoS Monitor System

梁宏漢(Hong-Han Liang)

指導教授 ： 周立德

國立中央大學/資訊電機學院/資訊工程學系/碩士(2007年)

摘要

網路服務日漸發達，各家網路服務業者也開始提供各種不同的網路服務，包含語音電話、視訊會議... 等。為了獲得正常的服務，這些服務都必須要達到需求的服務品質(Quality of Service) ，因此網路使用者會與網路服務業者簽訂服務等級契約(Service Level Agreement)，以保證網路服務能達到網路使用者的需求。由於網路服務的使用不一定會再同一網路服務業者內，以單一網路管理人員的觀點，無法得知這些跨網域服務的服務狀況，而使使用者的權利被忽略。
本論文提出以點對點(Peer-to-Peer)為基礎之網路連線服務監測系統，以網路使用者的觀點出發，利用分散在網路上的大量使用者，作全面性的網路連線服務監測，使一般的網路使用者能夠利用系統判斷其網路是否達到與網路服務業者訂立之服務等級契約，保證使用者之權利。本系統使用點對點之架構，使監測系統擁有彈性及強健度，使其他同一區域之使用者能代替離線使用者測量，維持監測資料之連續性，且利用點對點架構使用者分散之特性，增加監測的範圍，且不須經由網路服務業者更動網路設備的設定。每個監測目標使用頻寬約為2696.536bps，對ADSL來說足以使用，可避免從單點監測時，若監測封包被阻擋就無法取得服務資訊。本系統分兩種型態，一為安裝於網路使用者之監測代理員(Monitor Agent)，監測代理員之間互相監測取得連線服務資訊；另一為監測資訊收集者(Monitor Information Collector)，收集監測代理員所取得之連線服務資訊，以供查詢。

關鍵字

分散式系統 ； 點對點 ； 服務品質 ； 服務等級契約 ； 服務監測

並列摘要

Network services are more and more popular, and every Internet Service Provider (ISP) begins to offer all kinds of network services, including Voice over IP (VoIP), video conference and so on. In order to receive the normal service, these services must meet Quality of Service (QoS) requirements demanded by customers. To define normal services, the customers will sign Service Level Agreements (SLA) with ISPs to ensure ISP can reach QoS, which customers demand. Because the customers may use the network services in different ISPs, network managers are not able to know network service status across network domains, and the right of the customers is ignored.
This thesis proposes a P2P-based QoS Monitoring System (QMS). It considers the customers view, gathers a large number of users that distributed in the network, and makes comprehensive network connection service monitoring, so that common customers can use this system to determine whether its network meets SLA signed with the ISP, and guarantees customers'' right. The proposed system uses P2P architecture to improve flexibility and robustness. Even if a user leaves this system, another user at the same network domain can replace to maintain QoS information of monitoring continuously. In addition, the feature of the P2P architecture that users are distributed everywhere is used to increase the range of QoS monitoring and ISPs need not to change configurations of network devices. Every monitored destination uses 2696.536 bps, it is enough for ADSL. The proposed system can avoid problem that user cannot get QoS information because ISPs block packets from some domains in using firewall or network device configuration. The proposed system can get QoS information from other nodes. This system is divided into the two kinds of roles, One is the Monitor Agent, which is installed in customers’ computers, and monitors each other to get network connection information between two Monitor Agents; Another is the Monitor Information Collector, which collects network connection information form the Monitor Agent and provides information to all customers who install this system.

並列關鍵字

Service Level Agreement ； Quality of Service ； Peer-to-Peer ； Distributed Systems ； Service Monitoring

參考文獻

[1] S. Shenker, C. Partridge, R. Guerin, “Specification of Guaranteed Quality of Service”, RFC 2212, September 1997.

[3] ITU-T, “Principles for a Telecommunications Management Network (TMN)”, Rec. M.3010, 1996.

[4] Stephanos Androutsellis-Theotokis and Diomidis Spinellis. “A survey of peer-to-peer content distribution technologies”, ACM Computing Surveys, 36(4):335–371, December 2004.

[10] L. Daigle, “WHOIS Protocol Specification”, RFC 3912, September 2004.

[11] Gedik, B., Liu, L., “A scalable peer-to-peer architecture for distributed information monitoring applications”, Computers, IEEE Transactions on