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An increasing number of Internet applications and services render network management more troublesome for bandwidth misuse and security concern. As a result, network traffic identification plays an increasingly important role in network management. Deep packet inspection (DPI) is one of the effective approaches. Conventional network devices lookup the header of a packet, but DPI means the network device is required to match a pattern in the payload of a packet. This study proposes a DPI system and WMT (Wu-Manber with trie) algorithm to classify popular network services; The Net-DPIS is developed based on Netfilter framework in Linux kernel. The authors show how to rearrange the rule policies to increase the performance of Net-DPIS. In the results, the authors show that WMT algorithm is faster than WM algorithm; Net-DPIS has higher average accuracy and performance than L7-filter.