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Overview:

Existing mechanisms for defending against Distributed Denial-of-Service (DDoS) attacks are generally reactive in nature. However, the onset of large-scale bandwidth-based attacks can occur suddenly, potentially knocking out substantial parts of a network before reactive defenses can respond. Even for traffic flows that are not under direct attack, significant collateral damage will result if these flows pass through links that are common to attack routes. This paper presents a Proactive-Surge-Protection (PSP) mechanism that aims to provide a broad first line of defense against DDoS attacks. Their solution aims to minimize collateral damage by providing bandwidth isolation between traffic flows. This isolation is achieved through a combination of traffic forecasting, proportional allocation of network capacity, metering and tagging of packets at the network perimeter, and preferential dropping of packets inside the network.

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Format:PDFSize:734 KB
Date:Aug 2007
Pages:8

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