OPNET Technologies
7255 Woodmont Avenue
Bethesda, MD 20814
Tel: 240-497-3000
Fax: 240-497-3001
E-mail: university@opnet.com
Web: www.opnet.com

© 2008 OPNET Technologies, Inc.
OPNET and OPNET Technologies Inc.
are registered trademarks of OPNET.
All trademarks are the property of their
respective owners and are used herein
for identification purposes only.


University: University of Delaware
Professor: Adarsh Sethi 
Department: Department of Computer and Information Sciences

 

Teaching:

CISC 453/653 (Simulation of Computer Networks) taught by Prof. Adarsh Sethi. The course covers the principles of discrete-event simulation as applied to the simulation and modeling of computer networks. The course is centered around the use of IT Guru and OPNET Modeler for teaching network simulation to both undergraduate and graduate students. Course Syllabus

Recently published textbook:

Research:

Title: Stealthy Probing

Probing based approaches have been effectively used for network monitoring in the past. Probes such as ICMP pings provide an effective tool for detecting compromised nodes which try to delay or drop traffic. But an intelligent attacker may evade detection by giving preferential treatment to probe traffic. This is usually possible because probe packets have a different format from regular application packets and are easily distinguishable. The solution to this problem is to create stealthy probes which are indistinguishable from normal application traffic. In this research, we explore design approaches for stealthy probing, and we develop the design of a lightweight and effective scheme for generating stealthy probes.

    Related Publications

    • S. Ganesh, A.S. Sethi, and R. Hardy, ``Lightweight Scheme for Generating Stealthy Probes.'' Proc. DRCN-2009, 7th International Workshop on Design of Reliable Communication Networks, Washington, D.C. (Oct. 2009). PDF

Title: Internet Load Distribution

This project is in collaboration with Prof. Vasil Hnatyshin of Rowan University. The current best effort approach to Quality of Service (QoS) in the Internet can no longer satisfy a diverse variety of customer service requirements. We are investigating methods for providing fine-grained per-flow QoS that are scalable and fair, do not cause network congestion, and keep overall link utilization high. We have designed an efficient, fast, and scalable load distribution mechanism which fairly distributes available resources among the flows based on their resource requirements. The load distribution scheme is implemented via a message exchange protocol which incurs low overhead. We are studying the schemes together with alternative fairness mechanisms using simulations in OPNET.

    Related Publications

    • V. Hnatyshin and A.S. Sethi, ``Architecture for Dynamic and Fair Distribution of Bandwidth.'' International Journal of Network Management Vol. 16 No. 5 (Sept.-Oct. 2006), pp. 317-336. PDF
       
    • V. Hnatyshin and A.S. Sethi, ``Estimating Aggregate Resource Reservation for Dynamic, Scalable, and Fair Distribution of Bandwidth.'' Computer Networks Vol. 48 No. 4 (July 2005), pp. 525-547. PDF
    • V. Hnatyshin and A.S. Sethi, ``Scalable Architecture for Providing Per-flow Bandwidth Guarantees.'' Proc. CIIT-2004, the 3rd IASTED International Conference on Communications, Internet, and Information Technology, St. Thomas, US Virgin Islands (Nov. 2004), pp. 395-401. PDF
    • V. Hnatyshin and A.S. Sethi, ``Optimization of the Bandwidth Distribution Scheme for Handling Topology Changes.'' Proc. IPCCC-2004, 23rd IEEE International Performance, Computing, and Communications Conference, Phoenix, AZ (April 2004), pp. 215-222. PDF

This page was last updated on June 22, 2014.

OPNET Technologies, Inc. is a leading provider of solutions for managing networks and applications. OPNET's best-in-class solutions address application troubleshooting, application monitoring, network monitoring, network configuration management, network planning , and network simulation. OPNET’s solutions have been operationally proven in thousands of customer environments worldwide, including corporate and government enterprises, government and defense agencies, network service providers, and network equipment manufacturers. For more information about OPNET and its products, visit www.opnet.com.