Access Control List Blocking

This assignment explores network security concepts using Packet Tracer. A specific example illustrates how an Access Control List (ACL) can be configured on a router to block traffic from a PC attempting to access a web server. The document provides the command for configuring the ACL, details about forward and reverse mapping address testing for confirmation of the block, and includes a screenshot as visual evidence of the successful blocking.

Running head: TCP/IP NETWORKING
TCP/IP Networking
Name of the Student
Name of the University
Author’s note

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Executive Summary
The report is set up for planning and arranging a system utilizing different system interface that are
associated with installation of routers. Two routers are utilized for outlining the system and the client Pc
are associated with the interface of the primary router and the servers are associated with the interface
of the second router. Three servers are introduced in the system, for example, the DHCP, Web server
and the DNS server. The DHCP server is utilized for designation of IP deliver to the client machine
associated with the interface on the principal router and the DNS server contains the IP address and the
host name of the system and utilized for correspondence with the customer. The web server is arranged
with HTTP for serving the customer clients with the site pages and react to their demand. A firewall is
arranged in the system to square one of the customer PC to get to the WEB server and the screenshots
are joined in the report for demonstration of the configuration of the routers, PC and the servers
connected in the router.

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Table of Contents
Task 1: Setting up a Network..........................................................................................................3
1.1. Overview of the Network....................................................................................................3
1.2. Configuration of the PC, Server and Router interface.........................................................4
1.3. Configuration of the router.................................................................................................8
1.4. Pinging from the client end...............................................................................................10
1.5. Traceroute command from the client to the server..........................................................12
Task 2- Configuration of the network service...............................................................................13
2.1. DHCP..................................................................................................................................13
2.2. WEB Server........................................................................................................................14
2.3. DNS....................................................................................................................................15
2.4. Firewall..............................................................................................................................16
Bibliography..................................................................................................................................18

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Task 1: Setting up a Network
1.1. Overview of the Network
The network is designed with proper addressing plan and two routers are used for network. One
router connects with the client and the other connects with the server. The DHCP server is used for
serving IP address to the cl9ient automatically. The configuration is done with the help of ip helper. The
first router is configured with access control list for blocking the PC to communicate with the web
server. The successful pinging of the PC to the server is attached with the document to show the proper
configuration of the network and connectivity of the network devices.

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1.2. Configuration of the PC, Server and Router interface
Configuration of the PC0
Configuration of the PC1

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Configuration of the WEB server
Configuration of the DHCP server

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Configuration of the DNS server
Configuration of the router interface
Router 1

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Router 2

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1.3. Configuration of the router
Router 1 configuration:
Router>enable
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface FastEthernet0/0
Router(config-if)#ip address 192.18.1.1 255.255.255.0
Router(config-if)#
Router(config-if)#exit
Router(config)#interface Serial0/3/0

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Router(config-if)#ip address 192.18.2.1 255.255.255.252
Router(config-if)#exit
Router(config)#ip route 192.18.3.0 255.255.255.0 192.18.2.2
Router(config)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down
Router 2 configuration:
Router>enable
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface Serial0/3/0
Router(config-if)#ip address 192.18.2.2 255.255.255.252
Router(config-if)#
Router(config-if)#exit
Router(config)#interface FastEthernet0/0
Router(config-if)#ip address 192.18.3.1 255.255.255.0
Router(config-if)#
Router(config-if)#exit
Router(config)#ip route 192.18.1.0 255.255.255.0 192.18.2.1
Router(config)#

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%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down
1.4. Pinging from the client end
Ping the client's own network interface
Ping the local router gateway interface

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Pinging the remote router interface
Pinging the server

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The above screenshot is used for checking the connectivity between the servers and the PC0. If
a reply is got it means the configuration is correct.
1.5. Traceroute command from the client to the server
The above screenshot is about the path used by the router to send the data packets to the destination IP
address. The tracert command followed by the destination IP address used for finding the path.

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Task 2- Configuration of the network service
2.1. DHCP
The above screenshot provides the evidence of the configuration of the DHCP server and
allocation of the IP address to the client OPC using the DHCP server configured in the network.

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2.2. WEB Server

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The web server is configured with the HTTP service and the IP address 192.18.3.6 is used for the
configuration of the DNS server and accessing the server.
2.3. DNS
The DNS server is configured with the name of the student and the URL of the university and an
IP address is assigned for reverse mapping. The screen is attached for testing the working of the DNS
server and it is tested using the URL provided in the requirement of the assignment.

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2.4. Firewall
Router 1 Configuration:
Router(config)#access-list 100 deny tcp host 192.18.1.2 host 192.18.3.6 eq 80
Router(config)#access-list 100 permit ip any any
Router(config)#int fa 0/0
Router(config-if)#ip access-group 100 in
Router(config-if)#exit

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After the configuration of the access control list on the router 1 using the above command the
PC cannot access the web server and it gets blocked. The forward and the reverse mapping address is
tested for confirmation of the block and the screenshot is attached.

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Bibliography
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Oladipo, F. O., Madu, C. C., & Okoro, C. C. (2015). Re-Engineering Campus-Wide Internet Telephony
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