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zu einem TUM Informatik I8-Sonderkolloquium: Es spricht: Prof. James P.G. Sterbenz, Ph.D. The University of Kansas, U.S.A. http://www.ittc.ku.edu/~jpgs Termin: Montag, den 05.10.09, 14 Uhr Ort: Raum MI Besprechungsraum Informatik8 03.05.033 (MI-Gebäude, Campus Garching, 3. OG, Finger 5) Thema: Resilience, Survivability, and Heterogeneity in the Postmodern Internet James P.G. Sterbenz Abstract Society increasingly relies on computer networks in general, and the Internet in particular. Consumers rely on networks for access to information and services, personal finance, and for communication with others. The Internet has become indispensable to the routine operation of businesses and to the global economy. The military depends on network centric operations and warfare. Governments depend on networks for their daily operation, service delivery, and response to natural disaster and terrorist attacks. Furthermore, the Internet is being used in ways not anticipated by its designers and evolution of the protocols, in particular: TCP, IP, BGP, DNS, and HTTP. Emerging application paradigms and mashups coupled with usage scenarios that are increasingly disconnected and mobile challenge the current architecture. This has been recognised by research and development initiatives including NSF FIND (Future Internet Design), GENI (Global Environments for Network Innovation), and EU FIRE (Future Internet Research and Experimentation). This presentation will focus on two key aspects of the future Internet: resilience and heterogeneity. Resilience: The consequences to disruption of the Internet are increasingly severe, and threaten the lives of individuals, the financial health of business, and the economic stability and security of nations and the world. With the increasing importance of the Internet, so follows it's attractiveness as a target from bad guys: recreational and professional crackers, terrorists, and from information warfare. The EU FIRE ResumeNet project is exploring resilience and survivability as critical properties of the future Internet architecture. Heterogeneity: New applications and usage scenarios stress the Internet architecture that has evolved assuming a stable wired infrastructure. While the current hourglass waist provided by IP, DNS, and BGP has served the Internet well, the demand for heterogeneity stresses the least-common-denominator of the waist. The NSF FIND Postmodern Internet project (PoMo) is exploring heterogeneity as a first-class citizen in the Postmodern Internet, in which a new internetworking protocol serves as the glue for heterogeneous realms with explicit support for trust and policy boundaries. The Great Plains Environment for Network Innovation (GpENI) is constructing part of the GENI infrastructure, which will in part be used as a platform to test and evaluate ResumeNet and PoMo architecture. Additionally, research in two domain-specific realms will be described. Highly Dynamic Airborne Networking Highly dynamic mobile wireless networks present unique challenges to end-to-end communication, particularly caused by the time varying connectivity of high-velocity nodes combined with the unreliability of the wireless communication channel. Addressing these challenges requires the design of new protocols and mechanisms specific to this environment. Our research explores the tradeoffs in the location of functionality such as error control and location management for high-velocity multihop airborne-sensor networks and presents cross-layer optimizations between the MAC, link, network, and transport layers to enable a domain specific network architecture, which provides high reliability for telemetry applications. We have designed new transport, network, and routing protocols for this environment: TCP-friendly AeroTP, IP-compatible AeroNP, and AeroRP, which show significant performance improvement over the traditional TCP/IP/MANET protocol stack. Weather Disruption-Tolerant Millimeter-Wave Mesh Networking Millimeter-wave networks have the potential to supplement fiber in providing high-speed Internet access, as well as backhaul for emerging mobile 3G and 4G services. However, due to the high frequency of operation (70-90 GHz), such networks are highly susceptible to attenuation from rain. A resilient mesh topology with cross-layering between the physical and network layer has the potential to self-optimise under the presence of unstable links. Our research investigates mechanisms to overcome the disruptive effects of rain storms on network connectivity and service reliability. We propose two novel domain-specific predictive routing algorithms: P-WARP that uses real-time radar data to dynamically reroute traffic in advance of link failures, as well as a modified link-state algorithm XL-OSPF that uses cross-layering to instantaneously react to link failures. Simulations evaluate the effectiveness of the proposed algorithms based on data from real storms in the Midwest US. Bio Dr. James P.G. Sterbenz is Associate Professor of Electrical Engineering & Computer Science and on staff at the Information & Telecommunication Technology Center at the University of Kansas, and is a Visiting Professor of Computing in InfoLab 21 at Lancaster University in the UK. He has previously held senior staff and research management positions at BBN Technologies, GTE Laboratories, and IBM Research. His research interests include resilient, survivable, and disruption tolerant networking, future Internet architectures, active and programmable networks, and high-speed networking and components. He is currently in the NSF-funded FIND and GENI programs, and the EU-funded FIRE ResumeNet project. He received a doctorate in computer science from Washington University in 1991. He has been program chair for IEEE GBN and HotI, IFIP IWSOS, PfHSN, and IWAN, and is on the editorial board of IEEE Network. He is principal author of the book High-Speed Networking: A Systematic Approach to High-Bandwidth Low-Latency Communication.