As Wireless Mesh Networks (WMNs) are continuously gathering momentum, security has become a pivotal issue. Denial of Service (DoS) attack is a serious threat looming over WMNs due to their plug-and-play architecture. Unfortunately, a DoS attack is very difficult to stop due to the rampant spoofing of source IP addresses by the attackers. The best anti-dote, is to fix the problem at its root by ...

Networked wireless sensors in a harsh terrain typically are battery operated and, therefore, require energy efficient network protocols. In order to ease the analysis of the energy usage of proposed network protocols, this paper proposes an energy module, implemented in OPNET, to determine the energy consumption over time during network simulation. Multiple energy consumption modes, such as tra...

Modeling and simulation can help to validate and evaluate the performance of wireless sensor networks (WSNs) within specific applications. In order to resolve the issue of the restriction on node mobility in existing Zigbee WSN simulation models, this paper proposes a Zigbee compliant new simulation model using the OPNET simulator. Based on the Zigbee MAC layer model in OPNET Modeler, we develo...

As ubiquitous computing begins to become a reality, the problem of estimating database performance metrics, such as database latency between mobile systems or database latencies among fixed and mobile systems, will become an ever more important issue for network engineers. The problem of estimating database performance metrics, especially latency for mobile systems, is of particular concern to ...

In the paper, we compare simulation modes and programming interfaces of three popular network simulators: ns-2, J-Sim and OPNET. Our observations and conclusions are based on a “realworld” FTP application case study, and also on our earlier projects.

This paper presents our simulation study of distributed scheduling methods for Agile All Photonic Networks using the OPNET Modeler. Both Optical Burst Switching (OBS) and Optical Time Division Multiplexing (OTDM) are studied. We first describe the OPNET implementation of OBS and OTDM in the context of an Agile All Photonic Network. The technique of discrete event simulation in the OPNET Modeler...

Owing to the model-driven development (MDD) technology, reliable network protocols could be developed with an integrated and systematic way. As performance, another core metric for evaluation of network protocols, is usually not the target of MDD process, how to connect performance evaluation to the MDD process is an important issue. This paper presents a method to enhance the reliability of pe...