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  • 1.
    Göran, Gustafsson
    et al.
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Sebastian, Lundberg
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Överbelastningsattacker genom öppna reläer2014Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    This work concerns a specific type of Denial of Service attack which is becoming increasingly popular. These attacks are carried out through open relays with the purpose of getting a significantly higher effect than otherwise achievable. Examination of attacks carried out through the services DNS and NTP have been conducted with the purpose of providing a clear picture of how serious the threat is and also clarify how a system administrator can secure the services to protect both their own and others resources. The results of our studies show that an attack performed through a DNS service gives under optimal conditions a amplification factor of "102.4" and an attack through a NTP service gives under optimal conditions a amplification factor of "229.16". The results also show that the problem can be solved in whole or in part by limiting the allowed network or disable recursion in DNS and commands in NTP.

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