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In this video, we get
to do the planning

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for the GRE, the generic
route encapsulation tunnel

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that we want to build between
site one and site two.

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Let's go to the whiteboard,
and let's put a plan together.

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And here we go.

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So for our tunnels,
our GRE tunnels,

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let's plan on using
for both sites,

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let's go to use tunnel
interface, number zero.

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And for the tunnel
itself, we're going

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to go ahead and start the tunnel
from this reachable address

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of 15.1.1.1 to 25.2.2.2.

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So I will go ahead and
put little arrows there.
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So I will go ahead and
put little arrows there.

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Say those are the IPs for the
start and end of the tunnel.

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And for the actual
network address

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on the tunnel interfaces,
let's go ahead and use 10 dot,

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and it's routers one and
two, so let's use 10.12.12.0

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with a 24-bit mask in on R1.

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We'll call it dot one, and
on R2, we'll call it dot two.

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And then one last thing what
we definitely want to do

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is we want to make sure that
right now R1 has a default

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route that goes that way.

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R2 has a default
route goes that way.

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If we get a packet
source from 10.1,
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If we get a packet
source from 10.1,

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PC1, that's going
to 10.2, we want

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the router to use the
tunnel interface and not

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its default route.

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So to accomplish that, let's
go ahead and add EIGRP.

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And we'll use
autonomous system one,

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and let's only include
the ten networks.

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So in our network
statement, we'll

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say 10.0.0.0 with a wildcard
mask saying we only care

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about matching on the
first octet of 10.

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And so that ten will do
a couple things for us.

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One, it'll include
these networks over here

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at site one and site two.
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at site one and site two.

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It'll also include the
interface, the GRE tunnel

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interface that starts with ten.

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So we want to have that
enabled so that they'll be

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able to talk with each other.

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Now we don't want to
cause recursive routing,

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where R1 thinks that to get to
the other end of the tunnel,

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it should use the tunnel itself.

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That's a problem.

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So I'm not going to include
any of the public address space

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here in my EIGRP.

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It's just the
private address space

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on the inside of each site and
also on the tunnel interface,

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and I think that's
all we need to do.

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So with that plan in place, our
next step is to configure it,
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So with that plan in place, our
next step is to configure it,

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and that's exactly what we're
going to do in the next video.

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We'll configure the GRE tunnels,
the routing protocol, EIGRP,

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and we'll verify that it works.

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I'll see you in the next video.

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Meanwhile, I hope this has
been informative for you,

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and I'd like to thank
you for viewing.