Dubai, 20 November 29 November 2012
I.4 DPI use case: Network- versus Link-oriented DPI
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- I.4.2 Link-oriented DPI
- I.4.3 Network-oriented DPI
I.4 DPI use case: Network- versus Link-oriented DPII.4.1 OverviewThe DPI signatures (of DPI policy rules) may cover protocol layer 3 and upwards or start already with protocol layer 2 (see clause 3.2.5), which may be distinguished in network-oriented DPI and link-oriented, see Figure I.8. The crucial point relates to the fact that layer 2 information is limited, either to a point-to-point link or to the borders of layer 2 network domain. 
Figure I.8 – Network- vs. Link-oriented DPI I.4.2 Link-oriented DPILink layer protocol control information (PCI) is limited to a L2 network domain, and may consequently change in the end-to-end communication path. Usage of L2-PCI (e.g., ATM VCI, Ethernet Destination Address) as part of DPI signatures may thus question the applicability of such DPI policy rules. The policy decision entity must also be aware of the underlying layer 2 network infrastructure. However, there are use cases for Link-oriented DPI like for instance: • end-to-end network relates to a single layer 2 network; or • L2-VPN (layer 2 virtual private network) with L2-VPN dedicated DPI policy decisions. L2 network domain specific DPI should be thus supported by DPI functional entities.
NOTES –
a) There are scenarios with L3-PCI modifications between end nodes, e.g., the application of topology hiding (THIG) implies changes of L3 topology information (e.g., NAT (network address translation) in IPv4 networks), L3-VPN (layer 3 virtual private network). b) The model in clause I.4 considers the simplest case of a flat protocol stack. There might be however hierarchical (nested) protocol stacks in real networks like tunnelling methods (e.g., MPLS, IPv4-over-IPv6, Generic Routing Encapsulation (GRE, [b-IETF RFC 2784]), GPRS tunnelling in mobile access networks), which may lead to “L3-over-L3” packet types. Such protocol encapsulation is principally covered by the DPI definition (see clause 3.2.5), but not further detailed in this Recommendation. Directory: wp-content -> uploads -> 2012 2012 -> The Case Against the nypd’s Quota-Driven ‘Broken Windows’ Policing What Is It? 2012 -> Aa and na members Dying from Tobacco 2012 -> [Baby Crying] 01: 04 [Ching 2012 -> Unit Name / Nom de l’unité uic / ciu dates 2012 -> What We Owe Jehovah’s Witnesses 2012 -> Oceans Challenge Badge 2012 -> Canadian cycling olympians 2012 -> Greg landry, june olkowski and tom lysiak 2012 -> William goldman 2012 -> Does translocation and restocking confer any benefit to the European eel population? A review Download 1.36 Mb. Share with your friends:
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