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A Trace-Driven Analysis of Caching in Content-Centric Networks

Research output: Contribution in Book/Report/ProceedingsPaper

Published

Publication date07/2012
Host publicationProceedings of the 21st International Conference on Computer Communication Networks (ICCCN)
Original languageEnglish

Conference

Conference21st International Conference on Computer Communication Networks (ICCCN)
CountryGermany
CityMunich
Period30/07/122/08/12

Conference

Conference21st International Conference on Computer Communication Networks (ICCCN)
CountryGermany
CityMunich
Period30/07/122/08/12

Abstract

A content-centric network is one which supports host-to-content routing, rather than the host-to-host routing of the existing Internet. This paper investigates the potential of caching data at the router-level in content-centric networks. To achieve this, two measurement sets are combined to gain an understanding of the potential caching benefits of deploying content-centric protocols over the current Internet topology. The first set of measurements is a study of the BitTorrent network, which provides detailed traces of content request patterns. This is then combined with CAIDA’s ITDK Internet traces to replay the content requests over a real-world topology. Using this data, simulations are performed to measure how effective content-centric networking would have been if it were available to these consumers/providers. We find that larger cache sizes (10,000 packets) can create significant reductions in packet path lengths. On average, 2.02 hops are saved through caching (a 20% reduction), whilst also allowing 11% of data requests to be maintained within the requester’s AS. Importantly, we also show that these benefits extend significantly beyond that of edge caching by allowing transit ASes to also reduce traffic.