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This is one of multiple videos discussing IP version six routing.

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In this example, rather, one and router two are connected via a serial interface.

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These routers have just booted up and have no configuration apart from a default Janus three configuration.

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So as an example, if we use the command show IP interface brief.

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We don't see any IP addresses configured on the routers.

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And all interfaces on the routers are shut down.

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Show IPV six route shows no routes in the IP version six routing table.

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Because no IP version six addresses have been configured on the rider and we can see that by using the

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command show IP Version six Interface Brief.

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Output gives us similar information to what we would see using show IP.

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Interface brief.

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All interfaces are shut down.

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So on rata one, I'm going to enable IP version six unicast routing.

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And then go into the serial interface and know shut the interface and configure an IP version six address

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of 2001.

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Colon one.

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Colon.

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Colon one slash 64.

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Now when we look at the IP version six routing table.

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We see that a.

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Connected Network exists as well as a local network.

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The local network is the IP address configured on that interface.

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So this is the IP address that's configured on the Serial Zero interface, which we can see as follows.

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We're using a slash 64 mask, so the connected network is displayed with a slash 64 mask, but the 128

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bit IP address is shown in the output as well.

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Routers will create IP version six routes based on the unicast IP version six address configured on

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the interface.

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So this command results in this network appearing in the routing table.

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The router also creates the host route or local route using 128 bit prefix for the IP version six address

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configured on the interface.

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If we shut that interface down.

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And then look at the routing table again.

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You can see that the IP address has been removed from the routing table.

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So in the same way as we have with IP version four.

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The rot only appears in the routing table when the interface comes up.

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So interface serial to slash zero is now up up so we have the subnet or connected route and to the local

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route or host route added to the routing table.

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If the interface goes down, the route is removed from the routing table.

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I'll create a loopback address on this router with an IP version six address of 2001 face colon one

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colon colon one slash 64.

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So show IPV six route should show us that that route is added.

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Here it is.

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There's the Connected Network and there's the local or router IP address on Ryder two.

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We still don't have any IP addresses configured, so show IPV IPv6 route shows us no routes in the IP

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version six routing table.

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I'll enable IP version six unicast routing and then go into the serial interface and no, shut it.

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And configure an IP version six address on the interface of 2001.

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Colon one.

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Colon.

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Colon two.

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Slash 64.

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While I'm here, I'll configure the loopback address.

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As you can see, the serial interfaces now come up on both sides.

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So the loopback interface will be 2001 colon face colon to colon.

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Colon one.

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So show IPV six root.

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We can see multiple routes in the routing table.

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Here's the connected route for the serial connected route for the loop back local route or rather route.

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For the serial and loopback.

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Now Wall rather to be able to ping rather one on the serial interface.

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Answer is yes, and that's because they directly connected to one another and they are configured in

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the same subnet.

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So rather one can also ping rather to.

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We can prove that by doing a debug.

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Commands are very similar to IP version four.

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So debug IPv6 ICMP.

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When we do the ping, we can see the output here in a similar way to IP version four.

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Notice IP version four shows no ruts in the routing table because we haven't configured any IP version

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for addresses on these routers.

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This network is running a pure IPv6 implementation wool router to be able to ping the loopback of router

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one.

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What do you think?

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We'll write it to be able to ping the loopback of router one.

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Debug IP packet will show us the result.

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So let's ping the loopback of right of one.

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A request is being sent and I did the wrong debug there.

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Be careful of that mistake.

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Let's use debug IPV six packet rather.

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And see what happens now.

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So this is better.

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We can see an echo is being sent.

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Just stop that ping now.

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So an echo is being sent.

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The Rudd has picked this address as the source address.

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In other words, the serial interface or outgoing interface is used as the source address for ICMP traffic.

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Something very similar will happen in IP version four.

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So it's trying to send an echo to that address using this local IP address.

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With a destination set to that and the important piece is noticed.

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Route is not found.

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Again.

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Rot is not found.

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Rot is not found.

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The rudder cannot send traffic to that destination network because it doesn't appear in their IP version

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six routing table.

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So what we need to do here is configure static routes in this example because we're using a serial interface

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we can configure.

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A route using the local outgoing interface.

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So very similar to IP version four, we're going to use the IPV six Route Command.

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And specify the destination right.

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Which is 2001 face colon one.

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Colon.

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Colon A64 and the local outgoing interface is going to be serial to slash zero.

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So now.

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Can we ping that network?

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Yes, we can.

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We're getting a lot of debug information.

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So I'll turn off the debug.

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Scrolling up.

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You can see that the ping succeeded.

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And if we do that again, notice we can ping the loopback of router one.

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Now rather one doesn't know.

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About the loopback of router two, so we need to configure that.

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So IPV six route destination is 2001.

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Colon Face colon two.

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Colon.

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Colon one.

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Slash 64.

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Out going into face is going to be serial 2/0.

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So sho IPV six root.

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We can see that route added to the routing table.

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And we should be able to ping 2001 face to colon colon one.

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And that works.

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So again, just like with IP version four, you need to have a route in the routing table to be able

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to reach a destination network.

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In this example, we've added routes using study grants to the IP version six routing table and using

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the local outgoing interface rather than next hop address.

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So show run pipe include rat shows us that we are using the outgoing local interface to get to the destination

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network that works well in a point to point serial connection such as this, but won't work well when

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using Ethernet.

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When using Ethernet, you should use the next hop IP address.

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Now these routers are using CE 3725 software version 12.4 of the iOS.

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In a subsequent video, I'll configure static route using next hop IP address, but I'll use version

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15 software and I'll use viral images to do that.

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I hope you've enjoyed this video.

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If you have, please like it and please subscribe to my YouTube channel.

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I wish you all the very best.