Dubai, 20 November 29 November 2012
V.2.2 DPI for packets according other IETF reference models
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V.2.2 DPI for packets according other IETF reference modelsThe reference model for IETF IP networks of Figure V.2 may be further refined. Considering present IP networks in pre-NGN and NGN solutions, then there are often more detailed protocol stack architectures due to, e.g., access network type specific stacks, tunnelling methods, IPv4-to-IPv6 network transitioning scenarios or application specific framing and sub-layering. However, the very majority of such heterogeneous IP stacks could be mapped on three example reference models, called here basic, extended and tunnelled reference model (BRM, ERM, TRM), see Figure V.3. 
Figure V.3 – DPI examples for packets according other IETF reference models It may be concluded that above definition for DPIIETF-BRM would be still valid for the other reference models, from perspective of an IP hop entity (NOTE 2). NOTE 2 – The aspect of “deep” is thus dependent on the location of the DPI-FE. E.g., above discrimination between DPI and non-DPI could be different for a DPI-FE integrated in an IP node which terminates a tunnelling protocol. Appendix VI
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