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Tunnels

Tunnels. “Dr.” Mark Tunnel^Wtownsley , Cisco Fellow. We build them…. When and where we think we need them for specific purposes. What goes in should come out. Tunnels act like the layer below that which they are carrying Often not perfectly, but “good enough” for a specific purpose

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Tunnels

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  1. Tunnels “Dr.” Mark Tunnel^Wtownsley, Cisco Fellow

  2. We build them… When and where we think we need them for specific purposes

  3. What goes in should come out.. Tunnels act like the layer below that which they are carrying Often not perfectly, but “good enough” for a specific purpose IP tunnels act like Data Link Layers

  4. They provide us a Layer of Indirection All problems in computer science can be solved by another level of indirection… …except for the problem of too many levels of indirection - David Wheeler

  5. They have a wide variety of uses…

  6. For the specific case of IPv6 Transition • While incompatible on the wire, IPv4 and IPv6 are both still “philosophically” IP

  7. Dual Stack Transition Leap IPv4-Only Network Dual Stack Network NAT IPv4-Only Network IPv6-Only PE PE CE NAT CE IPv4-Only Users Dual-Stack Users IPv6-Only Users

  8. Transition Steps Instead of Leaps… Dual Stack Network IPv4-Only Network Dual Stack Network Dual Stack Network Dual Stack Network 6↔4 NAT I IPv6 Only IPv4-Only Network IPv6 Only IPv6-Only PE PE CE CE CE NAT CE Dual-Stack Users IPv4-Only Users Dual-Stack Users Dual-Stack Users IPv6-Only Users

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