This paper presents a framework for preventing both selfishness and denial-of-service attacks in peer-to-peer media streaming systems. Our framework, called Oversight, achieves prevention of these undesirable activities by running a separate peer-to-peer download rate enforcement protocol along with the underlying peer-to-peer media streaming protocol. This separate Oversight protocol enforces ...

Peer-to-Peer systems form logical overlay networks on top of the Internet. Essentially, peers randomly choose logical neighbours without any knowledge about underlying physical topology. This may cause inefficient communications among peers. This topology mismatch problem may result in poor performance and scalability for Peer-to-Peer systems. A possible way to improve the performance of Peer-t...

Due to enormous complexity of the unstructured peer-to-peer networks as large-scale, self-configure, and dynamic systems, the models used to characterize these systems are either inaccurate, because of oversimplification, or analytically inapplicable, due to their high complexity. By recognizing unstructured peer-to-peer networks as “complex systems”, we employ statistical models used before to...

Peer-to-peer systems and applications are distributed systems without any centralized control. The core operation in most peer-to-peer systems is efficient location of data items. The current well-known peer-topeer systems like Napster and Gnutella have scalability problem in location of data items. To solve the scalability problem, some scalable peer-to-peer lookup services show up, such as CA...

Peer-to-peer systems have gained widespread popularity for supporting resource location and distribution applications. To response to this, a number of peer-to-peer network architectures have been developed, each supporting a subset of application types, though no unifying P2P network architecture has emerged that is suitable for supporting today’s diverse peer-to-peer systems. The heterogeneou...

Introduction Peer-to-Peer networking has a great potential to make a vast amount of resources accessible [19]. Several years ago, file sharing applications like Napster [15] and Gnutella [8] impressively demonstrated the possibilities for the first time. Because of their success, Peerto-Peer mistakenly became synonymous for file sharing. However, the fundamental Peer-toPeer concept is general a...

Peer-to-peer systems were getting popular in the past by applications that have built over them, e.g. file sharing programs. They also are interesting in the actual research because of they could be widely used to build lots of network applications. This paper focus on two protocols used to build peer-to-peer systems and evaluates their performance: Pastry and Chord. They are classified as a se...

Though a few previous research efforts have investigated the peer availability of P2P systems, the understanding of peer dynamic is far from adequate. Based on the running log of a file-sharing P2P system, we produced a more thorough measurement of the dynamic natures of P2P system. We further show that due to the methodology limitation, crawler based measurement can not precisely capture syste...

Temporal networks encode interactions between entities as well as the time at which the interactions took place, allowing us to identify systematic processes within the network. We can identify subprocesses or temporal motifs that recur frequently across a large network. In this paper, we present a strategy that allows us to identify which of a given set of temporal processes are over-represent...