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Prieto Suárez, Iria

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Prieto Suárez

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Iria

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Automática y Computación

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Author: Prieto Suárez, Iria × Subject: Network ×

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Now showing 1 - 3 of 3
  • Thumbnail Image
    PublicationOpen Access
    Detecting disruption periods on TCP servers with passive packet traffic analysis
    (IARIA, 2015) Prieto Suárez, Iria; Izal Azcárate, Mikel; Magaña Lizarrondo, Eduardo; Morató Osés, Daniel; Automática y Computación; Automatika eta Konputazioa
    This paper presents a simple passive algorithm to monitor service availability. The algorithm is based on packet counting over a passive traffic trace of a population of clients accessing servers of interest. The major advantage of the algorithm is that it is passive and thus not invasive while usual monitor systems that can be found on Internet are active probing agents. The proposed system does not communicates to actual servers. It is easy to build as an online monitoring system with no big constraints in software or hardware. It does not relay on a distributed number of network placements for probing agents but works on a single network observing point near network edge. Initial proof of work of the algorithm is presented by analyzing unavailability problems for popular servers at an academic network at Public University of Navarre.
  • Thumbnail Image
    PublicationOpen Access
    A passive traffic algorithm for detecting unavailable periods in TCP services
    (IARIA, 2015) Prieto Suárez, Iria; Izal Azcárate, Mikel; Magaña Lizarrondo, Eduardo; Morató Osés, Daniel; Automática y Computación; Automatika eta Konputazioa
    This paper presents a simple passive algorithm to monitor service availability. The algorithm is based on packet counting over a passive traffic trace of a population of clients accessing servers of interest. The major advantage of the algorithm is that it is passive and thus not invasive while usual monitor systems that can be found on Internet are active probing agents. The proposed system does not communicate to actual servers. It is easy to build as an online monitoring system with no big constraints in software or hardware. It does not relay on a distributed number of network placements for probing agents but works on a single network observing point near network edge. Initial proof of work of the algorithm is presented by studying the influence of different kinds of disruptions on packet level traffic and analyzing unavailability problems for popular servers at an academic network at Public University of Navarre.
  • Thumbnail Image
    PublicationOpen Access
    A simple passive method to estimate RTT in high bandwidth-delay networks
    (IARIA, 2015) Prieto Suárez, Iria; Izal Azcárate, Mikel; Magaña Lizarrondo, Eduardo; Morató Osés, Daniel; Automática y Computación; Automatika eta Konputazioa
    This paper presents a simple passive algorithm to estimate the Round-Trip-Time (RTT) of a TCP connection in high bandwidth-delay network scenarios. In these scenarios, a passive RTT estimator that can be used on captured packet traces is a useful tool for performance analysis. The algorithm is based on observing periodic RTT patterns in a TCP connection that is not filling its bandwidth×delay product. The results are compared to other passive methods such as the RTT of initial TCP handshake or TCP Timestamp option samples. The algorithm is shown to be effective and may be used in more scenarios than other methods thus, it provides a valuable tool to improve the amount of TCP connection whose RTT can be measured in a captured packet trace.