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Abstra t. Aguri is an aggregation-based traÆ pro ler targeted for near real-time, long-term, and wide-area traÆ monitoring. Aguri adapts itself to spatial traÆ distribution by aggregating small volume ows into aggregates, and a hieves temporal aggregation by reating a summary of summaries applying the same algorithm to its outputs. A set of s ripts are used for ar hiving and visualizing summaries in di erent time s ales. Aguri does not need a prede ned rule set and is apable of dete ting an unexpe ted in rease of unknown proto ols or DoS atta ks, whi h onsiderably simpli es the task of network monitoring.