Whereas prefix hijacking is usually examined from security perspectives, this paper looks at it from a novel economic angle. Our study stems from an observation that a transit AS (Autonomous System) has a financial interest in attracting extra traffic to the links with its customers. Based on real data about the actual hijacking incident in the Internet, we conduct simulations in the real AS-level Internet topology with synthetic demands for the hijacked traffic. Then, we measure traffic on all inter-AS links and compute the payments of all providers. The analysis of our results from technical, business, and legal viewpoints suggests that hijacking-based traffic attraction is a viable strategy that can create a fertile ground for tussles between providers. In particular, giant top-tier providers appear to have the strongest financial incentives to hijack popular prefixes and then deliver the intercepted traffic to the proper destinations. We also discuss directions for future research in the area of hijacking-based traffic attraction.  

BitTorrent is the most popular P2P content delivery appli-cation where individual users share various type of content with tens of thousands of other users. The growing popular-ity of BitTorrent is primarily due to the availability of valuable content without any cost for the consumers. However, apart from required resources, publishing (sharing) valuable (and often copyrighted) content has serious legal implica-tions for users who publish the material (or publishers). This raises a question that whether (at least major) content publishers behave in an altruistic fashion or have other incentives such as financial. In this study, we identify the content publishers of more than 55K torrents in two major BitTorrent portals and examine their behavior. We demonstrate that a small fraction of publishers is responsible for 67% of the published content and 75% of the downloads. Our investigations reveal that these major publishers respond to two dif-ferent profiles. On the one hand, antipiracy agencies and ma-licious publishers publish a large amount of fake files to protect copyrighted content and spread malware respectively. On the other hand, content publishing in BitTorrent is largely driven by companies with financial incentives. Therefore, if these companies lose their interest or are unable to publish content, BitTorrent traffic/portals may disappear or at least their associated traffic will be significantly reduced.

This talk will introduce P2PSIP (Peer-to-peer Session Initiation Protocol) technologies, including the most common protocols and algorithms. The talk will also discuss the performance of these technologies in different network settings and the tradeoffs associated with deploying P2PSIP systems. Additionally, the talk will cover issues related to security and NAT traversal.

Marco Ajmone Marsan holds a double appointment as Chief Researcher at IMDEA Networks (Spain) and Full Professor at the Department of Electronics (Dipartimento di Elettronica) of the Politecnico di Torino (Polytechnic University of Turin) (Italy). He is the founder of the Telecommunication Networks Group, one of the top research groups in networking in Europe, based at the Politecnico di Torino.

Programa: 09:00 – 09:30 Bienvenida y registro de asistentes 09:30 – 09:50 Apertura de la jornada D. Arturo Azcorra, Director General, CDTI D. Francisco Marín, Presidente Área de Actuación de Innovación Tecnológica, AETIC D. Albert Banchs, Director, Institute IMDEA Networks D. Carlos Balaguer, Vicerrector de Investigación, UC3M 09:50 – 10:15 Presentaciones Presentación del Institute IMDEA Networks, D. Albert Banchs (  Descargar presentación 2006 Kb ) Presentación del departamento de I+D+i de AETIC, D. Juan Gascón, Director de Contenidos Digitales e I+D+i de AETIC (  Descargar presentación 2256 Kb ) 10:15 – 11:00 Bloque “Eficiencia Energética” Energy-efficient Networking at Institute IMDEA Networks D. Antonio Fernández Anta, Senior Researcher, Institute IMDEA Networks (  Descargar presentación 160 Kb ) TELVENT Energía D. Francisco Romero, Director Desarrollo de Negocio (  Descargar presentación 1.757 Kb ) INDRA Dña. Marta Arias, Gerente Área de Eficiencia Energética (  Descargar presentación 538 Kb )

Energy conservation is drawing increasing attention in data networking. One school of thought believes that a dominant amount of energy saving comes from turning off network elements. The difficulty is that transitioning between the active and sleeping modes consumes considerable energy and time. This results in an obvious trade-off between saving energy and provisioning performance guarantees such as end-to-end delays.

Ponente:  Lugar:  Fecha: 19 de octubre, 2010, 16:00h Organización:   

Coordinación: Dirección General de Universidades e Investigación, a través de la Fundación madri+d, Comunidad de Madrid La iniciativa IMDEA participará en la actividad “Por qué soy científico”, por medio de la intervención los directores de cada uno de los ocho institutos que la componen. Por qué soy científico Organizador: Instituto Madrileño de Estudios Avanzados (IMDEA) Horario: De 18:00 a 19:30 Lugar de celebración y accesos: Medialab Prado C/ Alameda, 15. Madrid Metro: Atocha y Cercanías: Atocha Autobuses: 6, 10, 14, 19, 26, 27, 32, 34, 37 y 45

Dr. Kenichi Mase, Dr. Toshini Tsuboi and Dr. Hiromi Ueda will visit Institute IMDEA Networkson Monday September 20th and will take the opportunity to present their research lines. The overall talk will last about 45 minutes, including questions and answers, and it will be divided in the following three 15 minute slots:

It this talk I will start with a brief overview of the research activities of our group at the University of New South Wales, Sydney, Australia, in the areas of core network switching, body area networking, and security for wireless sensor networks. I will then focus on the specific problem of sizing buffers in core routers, highlighting constraints posed by power consumption and optical storage technology. We investigate the impact of router buffer size on the characteristics of TCP traffic and its co-existence with open-loop traffic. We propose and analyze the efficacy of techniques such as traffic conditioning and forward error correction in managing contention loss in the network core. Finally, we speculate on the feasibility of a future Internet core with near-zero buffers.