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Papers
W. van Wanrooij, A. Pras
Scheduling Feed Retrieval © 2007 IEEE
Presented at IEEE ICC 2007, Network Services & Operation Symposium
Abstract: The popularity of RSS and similar feed formats is growing fast. This paper gives an overview of the standards and implementations in this field, and analyzes whether they allow scheduling the retrieval of feed updates. As will be shown, such support is very limited and current feed readers therefore poll providers at fixed rates. The measurements performed as part of our study show that in general a clear mismatch exists between such fixed polling rate of feed readers and the rate at which providers update their feeds; a significant performance gain is therefore possible by embedding scheduling information within feeds. This paper proposes a scheduling approach that both reduces lag in updates for active feeds and reduces wasted resources for less active feeds. Simulations show that our approach reduces the perceived lag by twenty percent, while having the same resource requirements as a fixed-rate algorithm.
W. van Wanrooij, A. Pras
Data on Retention © 2005 Springer-Verlag
Presented at DSOM 2005
16th IFIP/IEEE International Workshop on Distributed Systems: Operations and Management (DSOM 2005), Barcelona, Spain (2005-10-24/2005-10-24) In Lecture Notes in Computer Science nr. 3775 (Eds: J. Schönwälder, J. Serrat), Springer, 2005, ISBN: 3-540-29388-4, ISSN: 0302-9743, pp. 60-71
Abstract: Proposed EU regulations on data retention could require every provider to keep accounting logs of internet usage of its customers. Although the technical consequences of these requirements have been investigated by consultancy companies, this paper investigates what this accounting data could be, how it can be obtained and how much data storage is needed. This research shows that every gigabyte of network traffic results in approximately 400 kilobyte of accounting data when using our refinements to existing methods for storing accounting data: less by a factor twenty than previously assumed.
Read the full page article about this paper in Computable (one of The Netherlands leading ICT magazines).
W. van Wanrooij, A. Pras
DNS Zones Revisited
Presented at EUNICE 2005
EUNICE 2005 - Proceedings of the 11th Open European Summer School and IFIP WG6.4/6.6/6.9 Workshop (Eds: Delgado Kloos C., Larrbeiti D., Marin A., Campo C., Romeral R., Estevez-Ayres I. and Uruena M.), ISBN: 84-89315-43-4, Colmenarejo, Madrid, Spain, July 2005, page 84-92
Abstract: Recent research suggests that, due to misconfiguration, DNS reliability and performance is not always as good as it should be. This paper therefore investigates the correct configuration of DNS zones, by checking if main configuration requirements, recommendations and bestpractices rules have been followed. Our research shows that almost one out of four zones fail to pass one or more of our tests. Our study reveals an interesting correlation: if the number of name servers for a single zone exceeds a certain number, reliability and performance usually decreases.
W. van Wanrooij
Linux en SCO: familievete of zakelijk geschil?
August 2004
Contents: An entertaining term paper on SCO's intellectual property claims on Linux. This paper covers a general introduction on the historic rights to UNIX (starting at the epoch), the dispute between USL and BSDi/UCB, and the claims by SCO. Managing director of SCO benelux Elbert Vlastuin was interviewed for some counterpoints.
W. van Wanrooij
Juridische aspecten van een domeinnaam: door het oog van een informaticastudent
February 2004
Contents: An interesting paper making a theoretical case to consider domain names a "relative right" and not an "absolute right" (page 6-7). Although the SIDN does not officialy take a stand in these matters, an interview with SIDN's legal & regulatory officer was held for background information.