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After P2P file-sharing and VoIP telephony applications, VoD and live-streaming P2P applications have finally gained a large Internet audience as well. In this work, we define a framework for the comparison of these applications, based on the measurement and analysis of the traffic they generate. In order for the framework to be descriptive for all P2P applications, we first define the observable of...
The current Internet provides a best-effort service, which can not satisfy service quality guarantees that VoIP systems often require. Systems such as multi-homing and overlay network leverage path diversity that Internet inherently has to enhance end-to-end application performance. In this paper, we propose a P2P overlay approach, which is used to transmit media stream in SIP+P2P system. SIP+P2P...
There are more and more P2P applications in the Internet, with or without encrypted content. The P2P applications can be classified into three categories: file sharing (BT, eMule), VoIP (Skype, MSN), and video streaming (PPStream, PPLive). By observing the common communication nature among the peers, this paper proposes a simple but efficient way to identify the P2P traffic by the DNS query behavior...
Skype is one of the most successful VoIP application in the current Internet spectrum. One of the most peculiar characteristics of Skype is that it relies on a P2P infrastructure for the exchange of signaling information amongst active peers. During August 2007, an unexpected outage hit the Skype overlay, yielding to a service blackout that lasted for more than two days: this paper aims at throwing...
Multipath overlay routing technologies are seen as alternative solutions for VoIP because they inherit path diversity from peer-to-peer overlay networks. We discuss and compare the performances of two relay path selection approaches proposed for VoIP overlay systems through extensive simulations. We propose a new method for relay path computation that takes into account both path disjointness and...
Peer-to-peer (P2P) voice over IP (VoIP) applications (e.g. Skype or Google Talk) commonly use Web TCP ports (80 or 443) as a fallback mechanism to delude restrictive firewalls. This strategy renders this kind of traffic quite difficult to be detected by network managers. To deal with this issue, we propose and evaluate a method to detect VoIP calls hidden in Web traffic. We validate our proposal considering...
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