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CGN NAT Bypass

CGN NAT Bypass. X. Deng , M. Boucadair France Telecom C. Zhou Huawei Technologies T. Tsou Huawei Technologies (USA) G. Bajko Nokia. Core idea. How it works. Outbound Session B4 behaviors NAT & Encapsulation AFTR behaviors De-capsulation & forward Inbound Session AFTR behaviors

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CGN NAT Bypass

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  1. CGN NAT Bypass X. Deng, M. Boucadair France Telecom C. Zhou Huawei Technologies T. Tsou Huawei Technologies (USA) G. Bajko Nokia

  2. Core idea

  3. How it works • Outbound Session • B4 behaviors • NAT & Encapsulation • AFTR behaviors • De-capsulation & forward • Inbound Session • AFTR behaviors • Encapsulation & port forwarding • B4 behaviors • De-capsulation & NAT

  4. Scattered ports provisioning • What's the benefits of provisioning scattered ports? • For incoming ports • Scattered ports allocation is more likely to satisfy the random incoming port requests from applications • such as eMule, uTorrent,sharez, using UPnP 1.0 • A solution • to distribute bulks of non-continuous ports among subscribers, • also takes port randomization into account

  5. How to provision scattered ports? • Only two parameters • Subscribers ID pattern • Subscribers ID value 0 0 0 0 1

  6. Random ephemeral port selection within the restricted port for CPE NAT • Subscribers ID pattern • Subscribers ID value Only one line code needs to be changed!

  7. An Implementation DS-Lite encapsulation (demonstrated) CGN + PCP Server PCP Client SP’s Network RG NE40E-X3 IPv4 PCP message: I need a bunch of ports PCP message: I give you a set of scattered ports Location: 2000D Check out website for this demo: http://130.129.48.23:35328/

  8. Alternative implementationA+P encapsulation PCP/DHCP Server PCP/DHCP Client SP’s Network A+P RG PRR IPv4 PCP message: I need a bunch of ports PCP message: I give you a set of scattered ports

  9. _.._..,_,_ ( ) ]~,"-.-~~[ .=])'(; ([ | ]:: ' [ '=]): .) ([ |::' | ~~----~~ Thoughts?

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