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In the previous video, we have done installing
ubuntu server, now in this video, we are going

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to learn how to connecting ubuntu server with
the router inside gns3.

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Let’s just start.

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Shutdown the ubuntu server first, we can just
close this, and then choose power off

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Click on the ubuntu server and then click
settings, in the network section, here we

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can see that we have 4 network adapter, but
by default, we only have 1 active network

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adapter.

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Here adapter 2 is not active, adapter 3 is
not active and adapter 4 is also not active.

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So by default, only adapter 1 is active.

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And this adapter is attached to nat.

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Nat is used to connect to internet.

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Now, we want to connecting this ubuntu server
with router inside gns3, to do that, we will

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add one more adapter here.

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So click enable network adapter, for attached
to, we will leave it as not attached like

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this.

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Okay, we have done here, let’s go to gns3,
go to preference, in the virtualbox vms sections,

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click new to import new virtual machine.

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Here gns3 will detect all vm in the virtualbox,
in this case, I just have 1 VM, which is ubuntu,

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so choose this and then finish.

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Next we need to edit this vm to add new network
adapter, in the network section, here we can

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see that by default we only have 1 network
adapter, let’s add this become 2.

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Okay we have done here.

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Here we can see ubuntu, let’s import this
to the project.

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Let’s connecting ubuntu server with router1
and router2.

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Let’s remove the cable between router1 and
router2 first, let’s import a switch, connecting

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router1 to the switch, router2 to the switch,
and then from switch to ubuntu.

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Here we can choose ethernet0 and ethernet1,

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Ethernet0 is nat adapter, and ethernet1 is
not attached adapter, in this case, we will

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choose ethernet1.

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Okay we have done, next, here we can see that
the ubuntu is still red, this is means that

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ubuntu is not started yet.

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Let’s start it, right click and choose start.

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Wait for a minute until the ubuntu is started.

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While waiting the ubuntu for a booting, Let’s
make sure the ip address on the router,

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Router1, do show ip interface brief, here
we can see that in the fa0/0, the ip address

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is 10.10.10.1,

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Router2, do show ip interface brief, here
we can see that the ip address of fa0/0 is

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10.10.10.2

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And then for ubuntu server, let’s say the
ip address will be 10.10.10.254.

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Let’s back to the ubuntu, let’s login,

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To check the ip address on the ubuntu, the
command is ip address.

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Here we can see that we have 2 interfaces,
enp0s3, this

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interface is connected to internet, and then
we also have enp0s8 that connected to the

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router inside gns3.

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Later, we will configure the ip address of
enp0s8 become 10.10.10.254 . let’s start

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the configuration,

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nano /etc/netplan/00 and then tab,

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we can use autocomplete here, let’s try
to remove this first,

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here let’s type et and then tab, here we
can see that this is autocomplete, next let’s

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type net and than tab, okay this is not autocomplete,
let’s type p and then tab.

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Okay this is autocomplete.

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And then 00 tab, okay this is autocomplete.

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So this is the command to configure the ip
address on the ubuntu server, let’s enter

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here.

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Here we can see that by default, enp0s3 is
dhcp client, so the ubuntu server is get an

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ip address automatically on enp0s3.

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Now let’s configure enp0s8 using static
ip address, here let’s type enp0s8, pay

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attention here that we use 0, not o.

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And then here we can type the ip address,
10.10.10.254/24,

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Okay we have done here, to exit and save this
configuration, we can use ctrl + x, and then

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y, and then enter.

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Okay here we get an error message permission
denied.

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Ctrl + x again here and then choose no to
exit without save.

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Here we need to use sudo command, so sudo
nano /etc/netplan/00-installer-config.yml.

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enter,

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We need to type our password here,

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Now let’s configure the ip address of enp0s8
again.

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Okay we have done, ctrl + x to exit, y and
then enter.

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Okay we are success now, to apply the ip address
configuration, the command is netplan apply.

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Okay here we get an error message permission
denied again, remember that we need to use

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sudo,

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So sudo netplan apply.

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Let’s check the ip address again,

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Ip address, here we can see that the ip address
of enp0s8 is 10.10.10.254.

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Let’s try ping to router1 and router2, ping
10.10.10.1,

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Okay this is success.

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Let’s try ping to router2, ping 10.10.10.2,
okay this is also success.

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Okay so now we are success to connecting ubuntu
server with router inside gns3.

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I think enough for this video, in the next
video, we are going to configure ssh on the

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router so we can remote the router from ubuntu
server.

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Thank you for watching and see you on the
next video.