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Wolfgang Estgfaeller, "IPFIX Payload Aggregation for HTTP/1.1 Dialogs," Master's Thesis, Institute of Computer Science, University of Innsbruck, August 2015. (Advisors: Falko Dressler and Felix Erlacher)


Recent trends show an increasing amount of HTTP in internet traffic, among other things because many applications are using HTTP as their transport protocol instead of TCP. This creates a demand to monitor HTTP like other common transport protocols. To cope with today’s high data rates flow-based monitoring techniques like IPFIX are used. However, IPFIX does not yet involve the aggregation of HTTP information. This work is enhancing IPFIX to include HTTP information and is thereby laying the foundation for other network monitoring tools like Intrusion Detection Systems to efficiently process the resulting flow records. The implemented mechanism is able to observe TCP streams and detect HTTP messages in these streams. HTTP requests and responses, which belong to each other and thus form a dialog unit, are combined and exported as a single bidirectional IPFIX record. IPFIX information elements can now be used to aggregate HTTP information. The evaluation shows, that firstly, the implemented parsing mechanism can even deal with complex HTTP traffic and performs better then other well-known tools. And secondly, even in 10 Gbit/s networks the performance of the tool is still reasonably well.

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Wolfgang Estgfaeller

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    author = {Estgfaeller, Wolfgang},
    title = {{IPFIX Payload Aggregation for HTTP/1.1 Dialogs}},
    advisor = {Dressler, Falko and Erlacher, Felix},
    institution = {Institute of Computer Science},
    location = {Innsbruck, Austria},
    month = {8},
    school = {University of Innsbruck},
    type = {Master's Thesis},
    year = {2015},

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