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Peer to peer applications have modified the nature of internet traffic. It will consume high internet bandwidth and affect the performance of traditional traffic internet applications. Therefore, the management and monitoring activity of internet traffic is the important activities involved in the optimization. In order to detect and mitigate the P2P traffic, port, payload, and transport layer based methods were developed in the past. Nevertheless, the performances of these methods were not up to the expectation. Machine Learning (ML) is one of the promising methods to identify and mitigate the traffic of the Internet. However, the classification accuracy is inconsistent. The reason for the inconsistency is the relevant training datasets generation and feature selection. In this research, a technique based on signature-based and ML is proposed to develop a model for online P2P traffic detection and mitigation. The proposed work can be employed to evaluate the robustness of the online P2P machine learning classifier based on real network traffic traces containing flows labelled by SNORT tool and from special shared resources. Analysis and validation were carried out on traffic traces of University Technology Malaysia. The period of traffic was 2011 and 2013. The output of research is revealing that the proposed work has spent less computation time for classification. This method gives 99.7% accuracy which equals the classification performance attained for P2P using deep packet inspector. The findings show that classifying network traffic at the flow level can differentiate P2P over non-P2P (nP2P) with high confidence for online P2P mitigation.