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Accounting system for heterogeneous IP-networks (IPNA) implemented at Kaiserslautern University Worden, Brian Baltes, Claudia Scheler, Inga Müller, Paul Hagen, Hans Accounting system IP-network Communication informa- tion visualization online quality control This paper describes an accounting system (IPNA) for heterogenous IP-networks with arbitrary topologies implemented at the university of Kaiserslautern. The produced data volume per unit is numerated. The collected data is stored in a database and offers different analysis possibilities. The results can be visualized and adapted to the users requirements. The main effort was to build a data traffic quota system for single units as well as groups of devices that also report exceeded quotas. The system itself only observes the network traffic. Interfaces offer tools to interact with the network. The IPNA consists of a back-end for the data- acquisition and -preparation and a front-end for configuration and visualization tasks including quality control. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Brian Worden and Claudia Baltes and Inga Scheler and Paul Müller and Hans Hagen 2009 Is Part Of Dagstuhl Seminar Proceedings, Volume 9211, Visualization and Monitoring of Network Traffic (2009) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/DagSemProc.09211.3 urn:nbn:de:0030-drops-21557 https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09211.3 eng https://creativecommons.org/licenses/by/4.0/legalcode