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Denial of Service (DoS) attacks are a growing threat to the availability of Internet services. The paper presents dFence, a novel network-based defense system for mitigating DoS attacks. The main thesis of dFence is complete transparency to the existing Internet infrastructure with no software modifications at either routers, or the end hosts. dFence dynamically introduces special-purpose middlebox devices into the data paths of the hosts under attack. By intercepting both directions of IP traffic (to and from attacked hosts) and applying stateful defense policies, dFence middleboxes effectively mitigate a broad range of spoofed and unspoofed attacks. The paper describes the architecture of the dFence middlebox, mechanisms for on-demand introduction and removal, and DoS mitigation policies, including defenses against DoS attacks on the middlebox itself.

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Format:PDFSize:215 KB
Date:Feb 2007
Pages:14

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