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Christian Japes, "Implementierung eines Analysepakets zur Auswertung von gesammelten Netflow- bzw. Packet Sampling-Daten," Master's Thesis, Department of Computer Science, Friedrich–Alexander University of Erlangen–Nuremberg (FAU), November 2004. (Advisor: Falko Dressler)


The main objective of this thesis was to develop an analysis environment which makes it possible to collect and visualize information about the traffic having passed a network. All the analyses will be based on the IPFIX format which is currently undergoing standardization and helps in observing high speed network traffic. First of all a state-of-the-art examination took place by having a look at ntop, NetFlow Monitor and FlowScan. These tools are able to process the NetFlow format which is a predecessor of IPFIX. This was supposed to give an insight into the topic and show problems and possible solutions for the work to come. After studying the architecture and the information model of IPFIX, a closer look was taken at the PSAMP format. The reason for inventing another format is that information about network traffic can also be gained by examining only part of all the traffic, leading to some interesting new possibilities not available with IPFIX. Thereafter a concept for a new analysis environment was invented that not only allows the collection of data but also their interpretation and visualization by the means of charts. The result was a three-tier-architecture consisting of datakeeping, analysis and visualization. The data is kept in a MySQL database and filled with records by a data collection engine which - independent of the three layers - interacts with the database in a client-server fashion. For best possible platform independence and the applicability of one language for all parts of the program Java was the language of choice. A standalone program is responsible for the collection of data while the analysis was realized using the Java Servlet technology and visualization is based on the JavaServer Pages. Due to the separation of different tasks the resulting nasty environment (network analysis and statistics yielding) is well prepared for further development and addition of new functionality. With nasty a network administrator has a tool at hand to examine current as well as historical network traffic. Charts give an overview about the volume of traffic while tables help to take a closer look at certain events. By consistently separating different components nasty can be deployed in distributed environments and is therefore well suited for future requirements concerning performance.

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Christian Japes

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    author = {Japes, Christian},
    title = {{Implementierung eines Analysepakets zur Auswertung von gesammelten Netflow- bzw. Packet Sampling-Daten}},
    advisor = {Dressler, Falko},
    institution = {Department of Computer Science},
    location = {Erlangen, Germany},
    month = {11},
    school = {Friedrich--Alexander University of Erlangen--Nuremberg (FAU)},
    type = {Master's Thesis},
    year = {2004},

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