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The tussle between reliability and functionality of the Internet is firmly biased on the side of reliability. New enabling technologies fail to achieve traction across the majority of ISPs. We believe that the greatest challenge is not in finding solutions and improvements to the Internet's many problems, but in how to actually deploy those solutions and(More)
The long latency associated with mobile IPv6 home-address and care-of-address tests can significantly impact delay-sensitive applications. This paper presents an optimization of mobile IPv6 correspondent registrations that evades the latency of both address tests. An optimized correspondent registration eliminates 50%, or more, of the additional delay that(More)
Overlay-based services are a popular approach for providing functions like multicast, quality of service or security in the Internet without requiring infrastructure support. This paper presents the Underlay Abstraction Layer in the Spontaneous Virtual Networks (SpoVNet) architecture that enables easy and flexible creation of such services. Also building on(More)
Global availability of on-demand services with some level of guaranteed quality-of-service (QoS) is still missing in the Internet today. The Differentiated Services Architecture achieves scalability in the data path by subsuming all flows with a specific type of service into an aggregate. But in order to provide guaranteed end-to-end reservations, the(More)
The discrete event simulator OMNeT++, that is programmed in C++, shows a steady growing popularity. Due to its well-structured nature, it is easy to understand and easy to use. A shortcoming of it, however, is the limited number of available simulation models. Especially, for network simulations a validated TCP implementation was missing. In order to avoid(More)
— We present a novel end-to-end QoS architecture which enables seamless services over heterogeneous wireless access networks. We discuss the main architectural approaches and design issues of mobility-aware QoS signaling in IP networks. Then we introduce a QoS signaling architecture that integrates resource management with mobility management. It is based(More)
— The early detection of uprising DDoS attacks and worm propagations is still a challenge for today's network operators. An effective attack mitigation makes the detection of such network hazards close to its sources necessary. We therefore propose to use an in-network attack detection system which can be installed on routers. In high-speed networks a(More)
Current efforts to provide distinct levels of quality-of-service in the Internet are concentrated on the Differentiated Services (DS) approach. In order to investigate the gain for users of those differentiated services, early experiences with implementations with respect to real applications are needed. Simulation models are often not sufficient if a(More)