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[AUDIO LOGO]

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Hello, and welcome to Exploring
IPv6 Tunneling Options.

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In this skill, we're
going to be going over

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different ways of tunneling
IPv6 over an IPv4-only core.

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Now, we're going to
start off actually

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by talking about
dual stack, which

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is simply running both IPv4
and IPv6 at the same time.

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This is critical to understand
because it's actually

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a fundamental principle of
tunneling because our tunnel

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endpoints are going to
have to be dual stack.

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Now, the other routers
in the transport network

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don't have to be, but
the tunnel endpoints do.

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So we need to understand
how that functions.

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Then we'll move on
and talk about some

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of our manual tunnel options,
GRE and IPv6 6in4 tunnels.

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Then we'll start talking
about some automatic tunneling

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options.

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So we'll move on to
talking about 6to4.

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And then we'll talk
about 6RD, which

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is used to address a drawback
that we have with 6to4 tunnels.

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Finally, we'll wrap up
with talking about how

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we transport IPv6 over MPLS.

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Now, that's not
directly tunneling,

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but it is
encapsulating the IPv6,

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and it is still carrying
it over an IPv4-only core.

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So it does sort of belong
in the same category.

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So as you can hear, we have
a whole lot of fun stuff

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to cover.

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So join me as we
jump in and start

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talking about our IPv6
tunneling options.

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