PART $4$: DEFAULT ROUTE

Previously, you established network connectivity between each network. Later, you connected the two networks together. In this part of Project $2,$ you will connect both sites to the $$Internet$.$ Since we cannot emulate Internet connectivity within the Packet Tracer environment, we will use the word $$Internet$$ in quotes and loosely. To clarify, you will not be able to access real internet sites from this project network.

$4\mathrm{.}1.$ Configure basic settings on R$3$

Just like you did with the other routers, you will begin by configuring basic settings on R$3.$

Note: If you happen to save your configuration steps, you can change the hostname in the text file and paste the configuration into R$3.$

Using the table below, configure the basic settings on R$3$:

$$ Hostname: R$3$

$$ Domain name acme$-$university.edu

$$ Disable DNS lookup

$$ Set SSH to use version $2$ only and generate an SSH key using $2048$ modulus

$$ Set the enable secret to $$class$$

$$ Set the console password to $$cisco$$

$$ Set the line vty $015$ passwords to $$CMIT$-351$

$$ Users must use the passwords defined above to log in to Console and VTY lines

$$ Connections to the console and vty lines should be terminated after $30$ minutes of inactivity

$$ Set VTY lines to accept only encrypted SSH connections

$$ Set logging to synchronous for Console and VTY lines

$$ Set the MOTD to $$Unauthorized access is strictly prohibited!$$

$4\mathrm{.}2.$ Connect R$3$ to R$1$ and R$2$

We will use redundant connections between the routers. This way, if one of the connections goes down, the redundant connection will still carry the traffic.

Using the table below, connect the routers:

Source

Device

Source

Port Name

Destination

Device

Destination

Port Name

R$1$

GigabitEthernet$0/2$

R$3$

GigabitEthernet$0/0$

R$2$

GigabitEthernet$0/2$

R$3$

GigabitEthernet$0/1$

$4\mathrm{.}3.$ Configure IP addresses on the routers

Using the table below, assign IP addresses and add descriptions to the router interfaces:

Subnet

Device

Interface

IP Address

Description

$10\mathrm{.}0\mathrm{.}0\mathrm{.}4/30$

R$1$

GigabitEthernet$0/2$

The $1$st usable IP address

Connection to R$3$: G$0/0$

R$3$

GigabitEthernet$0/0$

The $2$nd usable IP address

Connection to R$1$: G$0/2$

$10\mathrm{.}0\mathrm{.}0\mathrm{.}8/30$

R$2$

GigabitEthernet$0/2$

The $1$st usable IP address

Connection to R$3$: G$0/1$

R$3$

GigabitEthernet$0/1$

The $2$nd usable IP address

Connection to R$2$: G$0/2$

$4\mathrm{.}4.$ Configure OSPF between the routers

Similar to the configuration on the other routers, configure OSPF on R$3$:

$$ Turn OSPF on using process id $100$

$$ Use router ID: $3\mathrm{.}3\mathrm{.}3\mathrm{.}3$

$$ GigabitEthernet$0/2$ should not send OSPF messages

Add the new networks to OSPF area $0$ on all three routers using the network command.

In a minute or two, you should be able to see all networks in the R$3$ routing table. If you do not see all networks in the R$3$ routing table, troubleshoot OSPF configuration.

$4\mathrm{.}5.$ Connect R$3$ to the ISP

In the real world, you would connect your edge router to an ISP modem or a router. In this project, you need to connect R$3$ port GigabitEthernet$0/2$ to the Modem on Port $1$

The ISP provided us with these IP addresses:

$$ IP Address: $172\mathrm{.}16\mathrm{.}0\mathrm{.}2/30$

$$ Default Gateway: $172\mathrm{.}16\mathrm{.}0\mathrm{.}1$

Configure the IP address on R$3$ GigabitEthernet$0/2$ and add the description to the interface: $$Internet connection$$

Finally, on R$3,$ create a default route using the information provided by the ISP.

To test if the $$Internet$$ connection is working, ping one of the addresses listed below from R$3$:

$208\mathrm{.}67\mathrm{.}222\mathrm{.}222$ and $208\mathrm{.}67\mathrm{.}220\mathrm{.}220($OpenDNS$)$

$1\mathrm{.}1\mathrm{.}1\mathrm{.}1$ and $1\mathrm{.}0\mathrm{.}0\mathrm{.}1($Cloudflare$)$

$8\mathrm{.}8\mathrm{.}8\mathrm{.}8$ and $8\mathrm{.}8\mathrm{.}4\mathrm{.}4($Google DNS$)$

Now, try pinging the same address from R$1$ or R$1.$ Can you ping the $$Internet$$ addresses?

The answer is no$.$ If you look at the R$3$ routing table, you should see an entry for the default route, but the same entry does not exist on R$1$ or R$2.$

$4\mathrm{.}6.$ Advertise the default route using OSPF

Configure R$3$ to distribute the default route into OSPF.

$4\mathrm{.}7.$ Validate your configuration

If the default route is properly redistributed into OSPF, R$1,$ and R$2$ will receive the update in a minute or two and should be able to access the $$Internet$.$

We$$ve created several IP addresses that you should be able to ping from any device on your network. These IP addresses act as an Internet test.

Ping these addresses from any device on your PT network to test connectivity:

$208\mathrm{.}67\mathrm{.}222\mathrm{.}222$ and $208\mathrm{.}67\mathrm{.}220\mathrm{.}220($OpenDNS$)$

$1\mathrm{.}1\mathrm{.}1\mathrm{.}1$ and $1\mathrm{.}0\mathrm{.}0\mathrm{.}1($Cloudflare$)$

$8\mathrm{.}8\mathrm{.}8\mathrm{.}8$ and $8\mathrm{.}8\mathrm{.}4\mathrm{.}4($Google DNS$)$

If the ping does not work, troubleshoot your configuration, and correct any issues.