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Configuring a router to act as an ISP


Packet Tracer ISP
PACKET TRACER ISP
Overview:  Configure a Router to act as an ISP
Difficulty: Easy
Objective: To have a router acting like an ISP for upcoming Lab Setup
I. ISP CONFIGURATION STAGE
<Configs>
First we will assign a hostname to our ISP Router

hostname ISP
Then we will create a loopback addresses to simulate the Public IP Address of the site were going to access
interface Loopback 1
description Global DNS
ip address 4.2.2.2  255.255.255.255
interface Loopback 2
description Google DNS
ip address 8.8.8.8  255.255.255.255
interface Loopback 3
description google.com
ip address 8.8.8.1 255.255.255.255
interface Loopback 4
description yahoo.com
ip address 98.139.183.24 255.255.255.255
We will then Assign IP Addresses to our interfaces
interface FastEthernet0/0
description ***Link to R1***
ip address 77.77.77.1  255.255.255.252
duplex auto
speed auto
interface FastEthernet0/1
ip address 2.2.2.1  255.255.255.252
duplex auto
speed auto
Then we will route it via EIGRP
router eigrp 1
network 77.77.77.0 0.0.0.3
network 2.2.2.0 0.0.0.3
network 8.8.8.8 0.0.0.0
network 8.8.8.1 0.0.0.0
network 98.139.183.24 0.0.0.0

Now were going to create an access-list to prevent entry of Private Addresses to our ISP Router
ip access-list standard BLOCKED
deny 10.0.0.0  0.255.255.255
deny 172.0.0.0  0.255.255.255
deny 192.0.0.0  0.255.255.255
permit any


Put this command under interface fastehernet 0/0 to filter those addresses
ip access-group BLOCKED in

II
Configuring a DNS Server for the ISP
Assign this IP Address to your Server.
IP
IP
Then Configure the Server as follow.
ser
Perform a Ping test to verify connectivity.
ping
PINGPING