Deep packet detection technology, that is, DPI technology, is a traffic detection and control technology based on application layer. When IP packets, TCP or UDP data streams pass through the bandwidth management system based on DPI technology, the system deeply reads the contents of IP packets, reorganizes the application layer information in the OSI seven-layer protocol, thus obtaining the contents of the whole application program, and then shapes the traffic according to the management strategy defined by the system.
Depth detection has powerful functions, which can allow packets to pass, reject packets, and check or modify packets from Layer 4 to Layer 7, including packet headers or loads. HTTP depth detection can view the URL, header and parameters in the message body. The depth detection firewall can be automatically and dynamically configured to correctly detect service variables, such as maximum length, hidden fields and radio buttons.
If the requested variable does not match, does not exist or is incorrect, the Trend Micro Deep Detection Firewall will abandon the request, write the event to the log and send a warning message to the administrator.
Extended data
Unified DPI refers to a group of DPI devices, which are used to collect and identify the traffic on the link and distribute the traffic or analysis statistics required by other systems to the third-party application system server. Various application systems related to traffic management in the network, such as inter-network traffic control, Web caching, illegal VoIP detection, online log retention, etc., are mainly composed of DPI devices and application servers.
Among them, DPI equipment is responsible for data collection, traffic analysis and statistics, and log synthesis, and the application server is mainly responsible for further analysis and processing of data, reasonably organizing and storing data, and presenting them. Unified DPI integrates DPI devices of multiple third-party application systems, and provides DPI capabilities for multiple systems through DPI multiplexing.
Baidu Encyclopedia-Deep Packet Detection Technology
Baidu encyclopedia -DPI