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IPv6 over IPv4 tunneling

The CT3 wiki is starting to grow organically. A few days ago, an excellent article “IPv6 over IPv4 tunneling” appeared out of the blue sky. Michael Aschwanden did a great job describing the IPv6 tunneling mechanisms and various free public services. He also included sample router configurations used to connect to the public tunneling services.

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  1. absolutely great article!!!

  2. For IPv6 over IPv4 does Cisco currently recommend ISATAP or 6to4?
    Odom says ISATAP but other sources say 6to4

    Thanks, MH

  3. 6rd would be my guess. It's better (and more controllable) than 6to4.

  4. Short answer is it depends; but definitely _not_ 6to4.
    6rd for tunneling across the access network. 6PE for tunneling over an MPLS enabled SP core.
    ISATAP can be made to work, assuming you have hosts supporting it, but it would be far from something I would recommend. The bottom three would be ISATAP, Teredo and 6to4 in that order.

    Native if you can tunnel if you must.


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