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Deep packet inspection is a type of data processing that inspects in detail the data being sent over a computer network, and may take actions such as alerting, blocking, re-routing, or logging it accordingly. Deep packet inspection is often used to baseline application behavior, analyze network usage, troubleshoot network performance, ensure that data is in the correct format, check for malicious code, eavesdropping, and internet censorship, among other purposes. There are multiple headers for IP packets; network equipment only needs to use the first of these for normal operation, but use of the second header is normally considered to be shallow packet inspection despite this definition.
There are multiple ways to acquire packets for deep packet inspection. Using port mirroring is a very common way, as well physically inserting a network tap which duplicates and sends the data stream to an analyzer tool for inspection.
Deep Packet Inspection enables advanced network management, user service, and security functions as well as internet data mining, eavesdropping, and internet censorship. Although DPI has been used for Internet management for many years, some advocates of net neutrality fear that the technique may be used anticompetitively or to reduce the openness of the Internet.
DPI is used in a wide range of applications, at the so-called "enterprise" level , in telecommunications service providers, and in governments.
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