This is one of multiple IP version six troubleshooting videos.
We've been told that rather one in this topology cannot ping rather three.
So let's verify that he has right a one.
So let's ping 2001 face colon.
Colon three.
Ping doesn't succeed.
We get unreachable messages.
Now show IP route won't help you in this topology because there are no IP version for addresses configured
on the router.
We can see that gigabit to zero zero is up and the loopback interfaces up.
But what we need to do is use show IP interface brief to see the IP address as configured on the router.
We can use traceroute to see how far traffic gets.
In this example, we can see that the trace gets to 2001 colon one colon colon two, which is rather
two.
And again, we could use commands such as show IP route to view the routing table.
Now rather, one has a default route to router two.
Traffic is getting to router two but is going no further.
So let's have a look at rather to.
Ping 2001 face three.
Notice what we're told.
No valid route to the destination.
So what do you think I should type now to verify what's going on?
Should I look at layer one?
So use commands such as show IP interface brief to verify layer one.
In this example, layer one is up.
Up.
Notice the interface is.
Up, up.
So it looks like layer one is up and layer two is up.
Should I use commands such as Show CDP neighbors to verify that a layer two is working?
In this example, we can see that router three is connected to router two.
So that implies that a layer two is working.
Show IP router won't help us because they are no IP version for rats.
But what about show IPV six rot?
Can you see the problem in this output?
Is there a route to the loopback of router three?
Notice there's no rot to rot.
A three in the routing table show IPV six rot to include face only shows us a static rot to write a
one and a local connection on router two.
So again, show IPV six rot.
There is no rot in the routing table.
Show IPV six protocols.
We don't have a routing protocol such as RIP or OSPF enabled, but we do have static routes configured.
So show run pipe.
Include root.
We can see a static route to the loopback of router one and then there's a default route to router three.
Notice the next stop is 2001.
Colon two.
Colon colon two.
So can we ping 2001?
Colon two.
Colon colon two.
Notice we told that there's no rut in the routing table.
In other words, we don't have a route to a router that's directly connected to us.
Can we ping ourselves?
So 2001, colon two.
Colon, colon one.
We told that we don't have a route to our local IP address that doesn't look right.
So show IPV six interface brief.
What's the problem in this output?
If you need to pause the video.
But what's the problem?
Notice here, gigabyte zero one has an IP address configured of 2001 colon.
One colon to colon.
Colon one when in actual fact it should be 2001 two one.
There's an extra one in the network.
So show run interface gigabit.
Zero one.
Notice the extra one in the network address.
So let's fix that.
So no.
IPV six address.
IPV six address 2001 two.
Colon.
Colon one slash 64.
Can we ping 2001?
Colon two, colon colon two.
Now we can ping root of three.
What about the loopback of router three?
We can ping the loopback of router three, so that looks promising.
What about from router one paying the loopback of router three?
So yes, that looks good.
We can ping the loopback of of three and we can ping the physical interface of router three.
Be careful with your IP addresses.
Look at your running tables.
Look at the configuration of your IP addresses to verify that it's correct.
Previously, we didn't have the static route in the routing table, but now we do.
So previously the static route was missing.
We had a static route to the loop of the one, but no static route to the loop back of Rider three.
Now we can get to the loopback of router three because of this default route.
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