Abstract
Peer-to-peer (P2P) content distribution systems are a major source of traffic in the Internet,
but the application layer protocols they use are mostly unaware of the underlying network in
accordance with the layered structure of the Internet’s protocol stack. Nevertheless, the need for
improved network efficiency and the business interests of Internet service providers (ISPs) are
both strong drivers towards a cross-layer approach in peer-to-peer protocol design, calling for P2P
systems that would in some way interact with the ISPs. Recent research shows that the interaction,
which can rely on information provided by both parties, can be mutually beneficial. In this paper
first we give an overview of the kinds of information that could potentially be exchanged between
the P2P systems and the ISPs, and discuss their usefulness and the ease of obtaining and exchanging
them. We also present a classification of the possible approaches for interaction based on the level
of involvement of the ISPs and the P2P systems, and we discuss the potential strengths and the
weaknesses of these approaches.
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