The Study of DPI Identification Technology Based on Sampling

DPI identification technology is a main technique of P2P data stream identification technology; the advantages of it are higher accuracy and the ability of distinguishing accurately which type of P2P applications. But it is difficult to apply in highspeed networks due to its slow execution speed. To solve this problem, this paper suggests six sampling strategies: invariable random sampling, invariable mechanical sampling, time random sampling, time mechanical sampling, speed random sampling mode and speed mechanical sampling. Discussing and testing how these strategies affect the DPI identification system in different network environments. Test conclusions shows that six sampling modes reduce the burden on the system in different degrees and maintain a high identification ratio of P2P data stream.