Performance Analysis of DiffServ based Quality of Service in a Multimedia Wired Network and VPN effect using OPNET
Quality of Service (QoS) techniques are applied in IP networks to utilize available network resources in the most efficient manner to minimize delays and delay variations (jitters) in network traffic having multiple type of services. Multimedia services may include voice, video and database. Researchers have done considerable work on queuing disciplines to analyze and improve QoS performance in wired and wireless IP networks. This paper highlights QoS analysis in a wired IP network with more realistic enterprise modeling and presents simulation results
of a few statistics not presented and discussed before. Four different applications are used i.e. FTP, Database, Voice over IP (VoIP) and Video Conferencing (VC). Two major queuing disciplines are evaluated i.e. Priority Queuing and Weighted
Fair Queuing for packet identification under Differentiated Services Code Point (DSCP). The simulation results show that WFQ has an edge over PQ in terms of queuing delays and jitters
experienced by low priority services. For high priority traffic, dependency of Traffic Drop, Buffer Usage and Packet Delay Variation on selected buffer sizes is simulated and discussed to evaluate QoS deeper. In the end, it is also analyzed how networks database service with applied Quality of Service may be affected in terms of throughput (average rate of data received)for internal network users when the server is also accessed by external user(s) through Virtual Private Network (VPN).
Keywords: Quality of Service, Queuing, Delay, Delay Variation, Jitter, DiffServ, Virtual Private Network
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ABOUT THE AUTHORS
Muhammad Aamir
Muhammad Aamir is MS-IT (Computing) Student at Shaheed Zulfikar Ali Bhutto Institute of Science & Technology (SZABIST), Karachi, Pakistan. He has done his Graduation (Bachelors of Engineering in Industrial Electronics) from Institute of Industrial Electronics Engineering (IIEE) under affiliation of NED University of Engineering & Technology, Karachi, Pakistan. His topics of interest are Computer Networks, Communication Systems, Automation and Human Machine Interfacing. He is currently a member of IEEE and Computer Society of IEEE. He is also a reviewer of IEEE conference papers.
Mustafa Zaidi
Syed Mustafa Ali Zaidi is a full time research scholar at the Faculty of Computing, Shaheed Zulfikar Ali Bhutto Institute of Science & Technology (SZABIST), Karachi, Pakistan. He received a Master of Applied Physics degree from Karachi University in 1994, Master of Power Engineering degree from NED University Karachi in 1997 and Master of Computer Science degree from SZABIST in 2010. He has received merit scholarship during the Master degrees and currently receiving scholarship for Ph.D. from Higher education commission Pakistan. His research interests include Computer Networks, Communication Systems and Optimization of multivariable quality characteristics using statistical & machine learning tools. He is also a member of IEEE.
Husnain Mansoor
Dr. Husnain Mansoor Ali is an Assistant Professor / MS-Coordinator at Department of Computing, Shaheed Zulfikar Ali Bhutto Institute of Science & Technology (SZABIST), Karachi, Pakistan. He received his B.E. Computer and Information Systems in 2004 from NED University Karachi, M.S. Networks and Telecom in 2006 and Ph.D. in 2010 from University of Paris SUD-XI. His research interest is in the area of Ad-Hoc Networks. He also has extensive experience of teaching and research.
Muhammad Aamir
Muhammad Aamir is MS-IT (Computing) Student at Shaheed Zulfikar Ali Bhutto Institute of Science & Technology (SZABIST), Karachi, Pakistan. He has done his Graduation (Bachelors of Engineering in Industrial Electronics) from Institute of Industrial Electronics Engineering (IIEE) under affiliation of NED University of Engineering & Technology, Karachi, Pakistan. His topics of interest are Computer Networks, Communication Systems, Automation and Human Machine Interfacing. He is currently a member of IEEE and Computer Society of IEEE. He is also a reviewer of IEEE conference papers.
Mustafa Zaidi
Syed Mustafa Ali Zaidi is a full time research scholar at the Faculty of Computing, Shaheed Zulfikar Ali Bhutto Institute of Science & Technology (SZABIST), Karachi, Pakistan. He received a Master of Applied Physics degree from Karachi University in 1994, Master of Power Engineering degree from NED University Karachi in 1997 and Master of Computer Science degree from SZABIST in 2010. He has received merit scholarship during the Master degrees and currently receiving scholarship for Ph.D. from Higher education commission Pakistan. His research interests include Computer Networks, Communication Systems and Optimization of multivariable quality characteristics using statistical & machine learning tools. He is also a member of IEEE.
Husnain Mansoor
Dr. Husnain Mansoor Ali is an Assistant Professor / MS-Coordinator at Department of Computing, Shaheed Zulfikar Ali Bhutto Institute of Science & Technology (SZABIST), Karachi, Pakistan. He received his B.E. Computer and Information Systems in 2004 from NED University Karachi, M.S. Networks and Telecom in 2006 and Ph.D. in 2010 from University of Paris SUD-XI. His research interest is in the area of Ad-Hoc Networks. He also has extensive experience of teaching and research.
