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A Rationale for Web Caching in Consumer ISPs: The Impact of DNS Lookup Times and HTTP Session Characteristics

Overview Web caches are generally considered a useful tool because they reduce replication of network traffic flowing from original content sources. This paper experimentally characterises the network and transport layer consequences of web caching in the consumer ISP context. The paper instruments a small number of Australian, broadband-attached homes to collect Round-Trip Time (RTT) and hop count statistics for their HTTP/TCP sessions, and collect DNS lookup statistics associated with each HTTP exchange. The paper estimates the impact of DNS lookup delays on overall HTTP session times, and use the RTT and hop count statistics to show that consumer ISPs would benefit greatly from local caching, particularly in Australia where speed of light delays have a large impact on sessions times when retrieving international content.

Further White Paper Details
Publisher	Swinburne University of Technology	File Format	PDF
Date Published	February 2005
Format	White Papers
Topics	Broadband, TCP - IP, ISPs

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