The existing Random Early Detection (RED) algo- rithm and its variants are found vulnerable to emerging attacks,especially the Low-rate Denial-of-Service (LDoS) attacks. In this letter we propose a Robust RED (RRED) algorithm to improve the TCP throughput against LDoS attacks. The basic idea behind the RRED is to detect and fi lter out attack packets before a normal RED algorithm is applied to incoming fl ows. We conduct a set of simulations to evaluate the performance of the proposed RRED algorithm. The results show that, compared to existing RED-like algorithms, the RRED algorithm nearly fully preserves the TCP throughput in the presence of LDoS attacks.

CounterLow-rateDenial-of-ServiceAttacks.pdf

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