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Voice-over-IP (VoIP) is a key component of next-generation-networks and rapidly becoming more and more common in the Internet in general. This also increases the demand of VoIP operators for a scalable, distributed and flexible monitoring. But current monitoring architectures are either not designed for including application layer protocol analysis and data acquisition, or they are very specific and...
Many large Web sites get more than millions hits everyday. They need a scalable Web server system that can provide better performance to all the clients that may be in different geographical regions. Higher delays and losses are common on wide area network (WAN) links. To provide a better service to all the clients, it is natural to have fully replicated web server clusters in different geographical...
Distributed denial of service (DDoS) attacks have become a major threat to organizations and especially to Internet and intranet. In DDoS attacks targets are overwhelmed by sending an enormous amount of traffic from a number of attack sites. The major tasks of any defense system are to detect these attacks accurately and early on, before it causes an unrecoverable loss. Most of the research in this...
As the next generation networks promise to provide network convergence with services for both static and mobile networks, the recent research focus is converging in the direction of standardizing common infrastructure based on all-IP networks. IMS is a recent initiative, designed by 3GPP and TISPAN partnership, which outlines a service delivery platform (SDP) framework. A flexible and robust QoS management...
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
The increasing ubiquity of mobile embedded systems has been matched by the evolution of a variety of wireless network standards and technologies. The major constraints of wireless embedded systems are limitations of communication bandwidth, processing capabilities, and battery power. Remote wireless embedded systems often act as sensors, which provide data to a certain community. The exchange of data...
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