Simulating Internet

By simulating Internet I mean creating a cloud which represents the action made by ISPs and other devices along the path to remote network’s target device. I’m not going to configure tens of devices to make it “real” but I’m going to make a cloud where these actions would occur between networks. There must be many ways to represent the Internet but I’m going to simple. If you make a cluster even from one router, it shows like a “Internet cloud”. So actually the “Internet” is a cluster made from only one router or as many you need. Routers are configured normally.

In this cluster I used only one router, Router1, which gets me to remote networks from my LAN.

First I selected the Router1 and created by pressing shift + u. This makes the router icon change to a cloud icon. I named this cloud as “Internet”, which it’s going to represent. When you click this icon you enter your cluster where you can add devices and configure them as you need in your project.

As I needed to connect my LAN with only two separate remote networks, I used a 1941 router. I chose three random IP addresses and networks for them and for the connection between Internet and our LAN’s edge router. Before I started to configure the routers, I added serial ports to connect them to each other.

Configurations for routers

Router1:

Router(config-if)#int g0/0
Router(config-if)#ip address 145.192.40.254 255.255.255.0
Router(config-if)#no shut
Router(config-if)#int g0/1
Router(config-if)#ip address 48.131.88.254 255.255.255.0
Router(config-if)#no shut
Router(config-if)#int s0/1/0
Router(config-if)#ip address 12.247.150.1 255.255.255.248
Router(config-if)#no shut

Router0:
Router(config)#int s0/1/0
Router(config-if)#ip address 12.247.150.3 255.255.255.248
Router(config-if)#no shut

Now I’m able to ping everything with Router1. I want to enable dynamic routing table  exchanges between routers so I enabled EIGRP with AS number of 10. Network command tells what networks router is directly connected to what is i going to advertise.

Router1: (This is a example for rest of the routeres)
Router(config)#router eigrp 10
Router(config-router)#network 145.192.40.0 0.0.0.255
Router(config-router)#network 48.131.88.0 0.0.0.255
Router(config-router)#network 12.247.150.0 0.0.0.7
Router(config-router)#no auto-summary

For connecting the Internet to my LAN segment I needed to connect Router0 to L3 switch also. I gave Router0 first address in the core address range. Then I enabled EIGRP and routing in connected port to Router0 on L3 switch.

L3 switch:
Switch(config)#router eigrp 10
Switch(config-router)#network 10.10.0.0 0.0.255.255
Switch(config-router)#network 192.168.1.0 0.0.0.63
Switch(config-router)#network 192.168.1.64 0.0.0.63
Switch(config-router)#network 192.168.1.128 0.0.0.63
Switch(config-router)#network 192.168.2.128 0.0.0.127
Switch(config-router)#network 192.168.1.192 0.0.0.63
Switch(config-router)#no auto-summary
Switch(config)#int g1/0/5
Switch(config-if)#no switchport
Switch(config-if)#ip address 192.168.1.2 255.255.255.192

Now I’m able to ping from any VLAN to Internet hosts and dynamic routing protocol is enabled on every routing device. This is current situation.

Next step is possibly going to be enabling NAT and making redundant connections.