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Deep Packet Inspection (DPI) is the act of any IP network equipment which is not an endpoint of a...

Deep Packet Inspection (DPI) is the act of any IP network equipment which is not an endpoint of a communication using any field other than the layer 3 destination IP address for any purpose. This is performed as the packet passes an inspection point, searching for protocol non-compliance, viruses, spam, intrusions or predefined criteria to decide what actions to take on the packet, including collecting statistical information. This is in contrast to shallow packet inspection (usually called Stateful Packet Inspection) which just checks the header portion of a packet. Deep Packet Inspection (and filtering) enables advanced security functions as well as internet data mining, eavesdropping, and censorship. Advocates of net neutrality fear that DPI technology will be used to reduce the openness of the Internet. DPI is currently being used by the enterprise, service providers and governments in a wide range of applications. Deep Packet Inspection (DPI) combines the functionality of an Intrusion Detection System (IDS) and an Intrusion Prevention System (IPS) with a traditional stateful firewall. This combination makes it possible to detect certain attacks that neither the IDS/IPS nor the