In recent years mobile networks have expanded dramatically, compared with other wireless networks. Routing protocols in these networks are designed with the assumption that there is no attacker node, so routing protocols are vulnerable to various attacks in these networks. In this paper, we review the network layer attacks and then we simulate the impact of black hole attack on ad hoc on demand...

Mobility management is becoming an important issue day by day due to the immense proliferation of wireless access networks globally. The IETF has standardized Mobile IPv6 (MIPv6) to handle user mobility in IP-based mobile data networks. Worldwide the researchers are putting in a lot of effort to render the mobility management as seamless as possible in order to enhance user experience. These re...

While small topology simulations are important for validation and educational purposes, large-scale network simulations are a fundamental part of active networking research. Therefore, it is important for a network simulator to provide scalable and efficient solutions to execute these types of scenarios. Using standard sequential simulation techniques, large-scale topologies with substantial ne...

The number of households and businesses using HFC cable networks for Internet access is rapidly approaching 20million in the United States. The cable industry has standardized on a single MAC and physical layer standard, the Data Over Cable System Interface Specification (DOCSIS). We have implemented a simulation model of the DOCSIS 1.1/2.0 MAC and physical layer using the ‘ns’ simulation packa...

National Security/Emergency Preparedness (NS/EP) requires effective communications supporting leadership and key staff in their access to information and their coordination of decisions. Results of testing voice over Internet protocol (VoIP) as a Next-Generation Network (NGN) application are presented and illustrate that effective NS/EP support is at risk during congestion possible in events re...

Ad hoc Network is a temporary network and these networks nodes are free to move about and organize themselves into a network. These nodes change position frequently. A Reactive (on-demand) routing strategy is a popular routing category for wireless ad hoc routing. The design follows the idea that each node tries to reduce routing overhead by sending routing packets whenever a communication is r...