A Remedy for Network Operators against Increasing P2P Traffic: Enabling Packet Cache for P2P Applications

Akihiro NAKAO

IEICE TRANSACTIONS on Communications   Vol.E91-B    No.12    pp.3810-3820
Publication Date: 2008/12/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.12.3810
Print ISSN: 0916-8516
Type of Manuscript: Special Section INVITED PAPER (Special Section on Peer to Peer Networking Technology)
P2P,  overlay networks,  packet cache,  P4P,  future Internet,  

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We observe that P2P traffic has peculiar characteristics as opposed to the other type of traffic such as web browsing and file transfer. Since they exploit swarm effect -- a multitude of end points downloading the same content piece by piece nearly at the same time, thus, increasing the effectiveness of caching -- the same pieces of data end up traversing the network over and over again within mostly a short time window. In the light of this observation, we propose a network layer packet-level caching for reducing the volume of emerging P2P traffic, transparently to the P2P applications -- without affecting operations of the P2P applications at all -- rather than banning it, restricting it, or modifying P2P systems themselves. Unlike the other caching techniques, we aim to provide as generic a caching mechanism as possible at network layer -- without knowing much detail of P2P application protocols -- to extend applicability to arbitrary P2P protocols. Our preliminary evaluation shows that our approach is expected to reduce a significant amount of P2P traffic transparently to P2P applications.