In Janus three.
I'm going to drag an absentee host to the workspace.
This Ubuntu host will be our PC in the topology.
I'm also going to drag a router into the topology and I'll add an ethernet switch.
To the topology.
So very simple topology of a PC, a switch and a router.
I'll connect to the PC, to the switch and to the switch to the router.
That's how the devices are connected to one another, and I'll start the devices up.
There's no configuration on any of these devices at the moment.
Let's open up a console to the PC.
We can see that it's an Ubuntu PC called a 1 to 1 and if I use the command if config is zero, you'll
notice that the PC doesn't have an IP version for address configured, but it does have a IP version
six a link local address.
This is the mac address of the PC.
Notice it ends an e nine.
This is the link local address of the PC.
Notice IP version six address f 80 slash 64 mask.
Scope is link local.
So let's have a look at the router.
The Rada has just booted.
A default configuration has been applied in this example, but what you'll notice is all interfaces
are currently shut down.
Show IP interface gigabit.
Zero zero.
Shows us that the protocol is down.
Show IPV six.
Interface gigabit is zero zero.
Shows no output.
Show IPV six interface brief no IP version six addresses are configured.
All the interfaces are shut down.
In other words, they administratively shut down.
What I'm going to do at this point is shut down the PC.
So I want to turn it off and then I'm going to configure the router.
What I also want to do is run a Wireshark capture on this link so that we can see.
Any messages that are sent by either the PC or the rather.
So at the moment we're not seeing any Wireshark captures.
But what I'll do on the right is give it a name.
I'll enable IPV six unique cost routing.
Go on to gigabit zero zero and let's configure an IPV six address of 2001 face colon colon one slash
64.
So do show run interface gigabit zero zero.
All I've done is configure an IP version six address on the interface and enable IPV six unicast routing.
When I know shut the interface, what we should notice is IP version six messages are sent and there
they are.
So here's a multicast message.
This is to do with MLD, that multicast is used for the multicast listener discovery protocol or MLD
version two.
So MLD reports are sent to this address EF zero two Colon.
Colon 16.
But for now, we won't concern ourselves with that protocol.
Notice, here's an example.
We have a neighbor solicitation message from a device with this source MAC address 82900.
So let's have a look at the Mac address of that interface.
So show IPV six rather interface gigabit is zero zero.
What you'll notice is this is the link local address of the router.
And the router has joined multiple multicast groups.
This is the global unicast address and if we do show interface gigabit is zero zero, you can see that
that's the burnt in address of the router.
So ending in 8900.
So this is the router sending a message.
If we open this up, we can see MLD messages.
I notice she has a neighbor solicitation message from the rather.
I'll filter for IPv6.
So we only see those messages.
And here again, you can see the neighbor solicitation message.
Here we have a rather advertisement message.
So the rot is advertising itself.
Notice it's advertising the source of link layer address.
So that's the mac address of the router.
We can see the empty view and notice here prefix information 2001 colon face colon.
Colon slash 64.
So again, show run interface gigabit zero zero.
That is the network that we configured on the Rado show IP version six interface gigabit 200.
That is the global unicast address on the router and that is the subnet that's been advertised.
So the Raiders advertising that network through a rather advertisement message.
If we scroll down.
You'll notice that that is continually advertised.
Here is another neighbour advertisement from the Router's IP address to all devices on the local segment.
And going back to advertisement.
Notice it's sending it to all hosts on the local segment.
Wireshark shows this quite nicely.
There is a neighbor advertisement.
Here again is a router advertisement message with the prefix and the right is continually advertising
that network.