Jochen Kögel

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More than 20 years after the launch of the public Internet, operator forums are still full of reports about temporary unreachability of complete networks. We propose FACT, a system that helps network operators to track connectivity problems with remote autonomous systems , networks, and hosts. In contrast to existing solutions, our approach relies solely on(More)
Users with several devices need a convenient mechanism to transfer running service sessions from one device to another device. This paper proposes a framework that allows session mobility without modifications on the communication partner's system from application layer down to network layer. That means we can transfer ongoing sessions with minor(More)
— Optical Burst Switching (OBS) has been proposed in the late 1990s as a novel photonic network architecture directed towards efficient transport of IP traffic. OBS aims at cost-efficient and dynamic provisioning of sub-wavelength granularity by optimally combining electronics and optics. In order to reduce the number of switching decisions in OBS core(More)
Flow Accounting is a passive monitoring concept implemented in routers that gives insight into trac behavior and network characteristics. However, processing of Flow Accounting data is a challenging task, especially in large networks where the rate of ow records received at the collector can be very high. We developed a tool for processing of Flow(More)
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