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About: Network Based Application Recognition     Goto   Sponge   NotDistinct   Permalink

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Network Based Application Recognition (NBAR) is the mechanism used by some Cisco routers and switches to recognize a dataflow by inspecting some packets sent. The networking equipment which uses NBAR does a deep packet inspection on some of the packets in a dataflow, to determine which traffic category the flow belongs to. Used in conjunction with other features, it may then program the internal application-specific integrated circuits (ASICs) to handle this flow appropriately. The categorization may be done with Open Systems Interconnection (OSI) layer 4 info, packet content, signaling, and so on but some new applications have made it difficult on purpose to cling to this kind of tagging.