The Internet's Transport Layer has been defined by TCP and UDP for the last 30 years. The minimal functionality of UDP enables application developers to develop their own proprietary protocols – there are plenty of examples.

Context-awareness is a peculiar characteristic of an expanding set of applications that make use of a combination of restricted spatio-temporal locality and mobile communications, to deliver a variety of services. Opportunistic communications satisfy well the communication requirements of these applications, because they naturally incorporate context.

The Internet is a messy, complex landscape. Middleboxes such as DNS resolvers, UPnP home gateways, and in-path proxies placed in the IP core of the operators' networks can significantly impair a user's access despite being designed for the contrary.

El simposio internacional de computación distribuida (International Symposium on DIStributed Computing – DISC) es un foro internacional sobre la teoría, el diseño, el análisis, la implementación y la aplicación de sistemas y redes distribuidas. Está organizado en cooperación con la Asociación Europea de Informática Teórica (EATCS – European Association for Theoretical Computer Science). Este congreso, en colaboración con el simposio de ACM sobre principios de computación distribuida (PODC-ACM Symposium on Principles of Distributed Computing), otorga anualmente el prestigioso galardón Edsger W. Dijkstra Prize in Distributed Computing y el premio a la mejor disertación en computación distribuida (The Dissertation Award in Distributed Computing).

El congreso “IFIP Performance” reúne a investigadores interesados en la comprensión y mejora del desempeño de los sistemas de comunicación mediante modelos cuantitativos y técnicas de solución de última generación.

This paper presents a simple framework, called WalkAbout, to infer a coarse view of connectivity in very large graphs; that is, identify well-connected “regions" with different edge densities and determine the corresponding inter- and intra- region connectivity.

El viernes 26 de septiembre de 2014, entre las 18:00 y las 21:00 horas, algunos investigadores de los Institutos de investigación IMDEA mostrarán al público que en un automóvil se pueden encontrar ejemplos de los avances experimentados por ciencias y tecnologías tan diversas y aparentemente poco relacionadas entre sí, como el software, la ciencia de materiales o la alimentación.

Peer-to-peer networks have been quite thoroughly measured over the past years; however it is interesting to note that the BitTorrent Mainline DHT has received very little attention even though it is by far the largest of currently active overlay systems, as our results show. As Mainline DHT differs from other systems, existing measurement methodologies are not appropriate for studying it. In this talk we present an efficient methodology for estimating the number of active users in the network. We have identified an omission in previous methodologies used to measure the size of the network and our methodology corrects this. This omission may lead to inaccuracies of up to 40% in the number of active users. Our method is based on modeling crawling inaccuracies as a Bernoulli process. It guarantees a very accurate estimation and is able to provide the estimate in about 5 seconds. Through experiments in controlled situations, we demonstrate the accuracy of our method and show the causes of the inaccuracies in previous work, by reproducing the incorrect results. Besides accurate network size estimates, our methodology can be used to detect network anomalies, in particular Sybil attacks in the network. We also report on the results from our measurements which have been going on for almost 2.5 years and are the first long-term study of Mainline DHT.

Publish/subscribe (pub/sub) is a popular communication paradigm in the design of large-scale distributed systems. We are witnessing an increasingly widespread use of the pub/sub for wide array of applications both in industry and academia and yet there is a lack of detailed study of a large-scale real-world pub/sub system.

Virtualization is a powerful paradigm in computer science, as it allows to decouple software and services from the constraints of the underlying physical infrastructure. Virtualization is also one of the main innovation motors in today's Internet