London South Bank University
IP Based Communication
Networks
Lab Manual
Ya Bao
Table of Contents
1.
Lab Report Guidelines ......................................................................................... 2
2.
Report requirements: ........................................................................................... 3
3.
Report submission ............................................................................................... 3
LAB 1 Internet Connect for Home Network ................................................................... 4
LAB 2 ICMP Ping......................................................................................................... 13
LAB 3 LAN Implementation ......................................................................................... 17
LAB 4 WAN Implementation ....................................................................................... 22
The assessment of the lab report ................................................................................. 27
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1.
LAB REPORT GUIDELINES
Formal lab reports should be typed on A4 paper and contain the following sections and don’t
exceed the limit of the length.
 Title Page:
Title of the experiment,
Author’s name and student number.
Your instructor's name.
The date the report was submitted.
 Aims and objectives
What was the purpose of the experiment? What was it supposed to reveal?
 Introduction/Theory
The introduction should give some background on the problem your experiment investigated.
Theory section presents theoretical models, equations, physical principles, etc., that are
relevant to the investigation described in the report. It should be within one page.
 Materials
List everything needed to complete your experiment.
 Methods/Procedure
Describe the steps you completed during your investigation. Don’t simply copy the
instructions given in the lab manual. You need to describe what YOU did. Make good use of
diagrams, sketches, or photographs to show important layout, wiring and connections
 Experimental Results and explanations
Present your results and summarise the data using figures and tables. Each figure and each
table must have a number and a caption. Do not simply dump a bunch of graphs and tables
into this section with no explanation. It is best to locate figures and tables within the text (and
preferably on the same page where they are referred to) rather than grouping them together at
the end of the report.
 Discussion
Discuss the meaning and importance of the experimental results, compare the results to
theoretical predictions, describe the accuracy of the results, address discrepancies, and
ultimately draw conclusions in regards to the objectives of the experiment.
 Conclusions and Recommendations
This section summarizes the conclusions that have been made and gives specific
recommendations for the next steps that could be taken in subsequent experiments or further
research.
 References
If your research was based on someone else's work or if you cited facts that require
documentation, then you should list these references.
http://www.lsbu.ac.uk/library/html/documents/HS28-numeric2012.pdf is a very helpful
sheet on how referencing should be done in any technical report (Lab or final project)
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2.
REPORT REQUIREMENTS:
 The report should be 10-14 A4 sides.
 The report is required to write on one of experiments you have done in this semester.
Everyone must produce his/her individual report independently. Any duplicated
paragraphs will be penalized.
3.
REPORT SUBMISSION
29th November 2012, 11.00 pm
Deadline of submitting:
. Late submission
will be penalized in accordance with the University regulation. Keep your receipt and the
electrical copy!
You are required to submit your report online via IPBCN
blackboard site.
The feedback of your report will be available on the Blackboard.
In the IPBCN BB site, click “Submit Lab Report” button. Click the link of submit to Ya
Bao.
You have only one chance to submit your report. You can't amend or delete your report
from the Blackboard after submission.
IPBCN Workshops hold in Lab T714
Switch on a lab computer, choose to login to Window XP
User name: lab
Password: lab
On the desktop, double click on the icon of OPNET IT Guru
Lab.1 to Lab.4 are designed to help you familiar to OPNET. Your coursework
should write on an own designed network and performance analyses of the network.
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Lab 1. Internet Connect for Home Network
LAB 1: INTERNET CONNECT FOR HOME
NETWORK
Objective
This lab teaches the basics of using OPNET IT Guru. We investigate application performance and
capacity planning, by changing the link speed between a home LAN and its ISP.
Overview
OPNET’s IT Guru provides a Virtual Network Environment that models the behaviour of networks,
including its routers, switches, protocols, servers, and individual applications. The Virtual Network
Environment allows IT managers, network and system planners, and operation’s staff to more
effectively diagnose difficult problems, validate changes before they are implemented, and plan for
future scenarios such as traffic growth and network failures.
You can do “what if” analyses (called scenarios in IT Guru) on network designs, just as you can on
spreadsheets with financial business models. However, instead of looking at “bottom line” financial
numbers, you will be looking at how response times, latency (delays) and other network performance
measures will change under different network design approaches.
To create a network simulation (called a project in IT Guru), you specify the nodes (computers,
switches, routers, etc.) in your network, the links between nodes, and the applications that will be
running on the nodes.
In this exercise, the initial simulation (project) has been built for you. It models a family’s home PC
network, which has three PCs connected to the Internet for game playing; web browsing, E-mail,
audio streaming, and FTP (file transfer protocol).
Your objective will be to conduct a series of what-if simulations (scenarios) to see how
performance differs if the family connects to the Internet using
1) a slow modem downloading at 20 kbps,
2) a fast modem downloading at 40 kbps,
3) a cable modem or DSL line downloading at 512 kbps, or
4) a T1 line (discussed in Chapter 6) with download speed of 1.544 Mbps
For each scenario, you will set the download speed in the simulation model, run a simulation, and
view the results. You will be addressing the question of whether faster connections are worth
higher prices for the home network.
Lab Instructions
Step 1: Open Lab file
IT Guru consists of projects and scenarios. Each scenario represents the different what-if analysis
performed by the users. Scenarios may contain different versions of the same network or models of
different networks. A project consists of one or more network scenarios. In this lab, you will create
4 different scenarios comparing application performance with different connection speeds to the ISP.
1. Start IT Guru.
2. Select File → Open… and make sure Project is selected from the pull-down menu at the
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Lab 1. Internet Connect for Home Network
top.
3. Scroll down to the project named Home_LAN, select it and click OK.
The figure above shows the simulated network.
There are three PCs doing different tasks in this network. Each PC connects to the family’s 100
Mbps Ethernet switch via a UTP connection. The switch connects to the router, also via UTP. The
cable modem is not shown; it is implicit in the WAN link connecting the home PC network to the
Internet. Three Internet servers provide different services to the client PCs.
Near the top of the figure are two boxes that do not represent physical components: Applications
and Profiles. The Applications node contains data about the applications used in the network, such
as Web browsing. More specifically, traffic is associated with each application, so there is a
difference between “light Web browsing” and “heavy Web browsing.” Internal file service and
print service traffic are not shown; these would be too light to make a difference in performance
because the Internet WAN connection is the weak link in this network. In the Profiles icon,
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Lab 1. Internet Connect for Home Network
different applications are associated with different PCs.
The complete topology is laid out and the attributes for all the objects are pre- configured except
the link data rate between the Router and the Internet cloud, this is our WAN link.
Step 2: Configure the Link to 20 Kbps
In your first scenario, you will configure the WAN link as a 20 kbps dial-up line.
1. Right-click on the WAN link, select Edit Attributes.
Here we can see the different link attributes. We will be changing the data rate attribute of this
link.
2. Click in the Value field of the data rate attribute and select Edit…
3. Enter 20000; press Enter and then click OK.
Step 3: Configure and Run the Simulation
To simulate this network, we will use high fidelity discrete event simulation. The model simulates
client/server application packets, which represent real world network traffic.
1. Click on the configure/run simulation button.
2. Make sure the Simulation Duration is set to 8 hours to represent a typical day.
3. Click Run, monitor the progress bar as the simulation proceeds.
4. When the simulation completes, Click Close.
Step 4: View Results
We can now view various statistics including the web application Response Time experienced by
the Researcher and the WAN link utilization. Follow the instructions below to view the statistics.
Performance for the WAN link
1. Right-click on the WAN link and select View Results to view the utilization results for this
link.
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Lab 1. Internet Connect for Home Network
2. Expand point-to-point and select utilization in both directions.
3. Select Overlaid Statistics from the pull-down menu on the bottom right- hand corner to place the
results in the same panel.
4. Select Show and then click Close in the View Results window.
Performance for PC2 (Researcher PC)
5. Right-click on the PC2 Researcher client and select View Results to view the web Response
Time and Traffic Received.
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Lab 1. Internet Connect for Home Network
6. Expand Client Http and select Page Response Time (seconds). Also make sure that the pulldown menu on the bottom right-hand corner is set to As Is.
7. Click Close in the View Results window.
8. You can use the hide or show all graphs button
to hide/show the graphs.
Your results should be similar to the graphs above. The download link Utilization averages about
80% and the upload link Utilization about 2%. With a download link utilization of 80%, this does
not give much available bandwidth for potential new applications or users. The Response Time that
the Researcher experiences is in the range of 5 to 7.5 seconds, which is painfully long. This slow
WAN link is badly overloaded.
Step 5: 40 kbps Scenario
Implement a fast modem connection downloading at 40 Kbps. This is realistic throughput for a
modem whose download speed is rated at 56 Kbps.
1. Select Scenarios →Duplicate Scenario… and name the scenario as
40K_dialup_connection.
2. Click OK. This creates a copy of the existing scenario.
Step 6: Configure the Link to 40 Kbps
Right-click on the WAN link and change the data rate attribute to 40000.
Step 7: Run the 40 Kbps Simulation
Rerun the simulation. You can refer to the steps given previously for setting the duration and
running the simulation.
Step 8: View Results for 40Kbps Scenario
Follow the same steps mentioned before to view the link utilization, and
Response Time by the researcher PC.
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Lab 1. Internet Connect for Home Network
Notice, that the link Utilization is reduced by half.
The web application Response Time also went down from about 6 seconds to around 2.25
seconds. This is a significant improvement, both, in Utilization and Response Time.
Step 9: Set the link to 512 Kbps and run the simulation
In the third scenario, you will simulate a 512 kbps download speed. This is a realistic downloading
throughput for a cable modem or DSL line. This WAN connection




Duplicate the scenario as before and name it 512K_Cable_Modem_connection.
Set the data rate for the WAN link to 512000.
Rerun the simulation.
View the results for link utilization, Response Time and Traffic Received by the
Researcher PC.
The Utilization went down to 4% and the Response Time for the Researcher went down to
0.15 seconds. The cable modem improves our download times greatly. Response time is very
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Lab 1. Internet Connect for Home Network
good.
Step 10: Configure the link to T1 line and run the simulation
The ISP also provides residential T1 connection. T1 lines, offer a rated speed of 1.544 Mbps in
both directions. This is also its actual throughput. The fourth scenario will consider the benefits of
using a T1 WAN link to the ISP.
Duplicate the scenario again and name it T1_connection.
Change the data rate of the WAN link to T1 from the pull-down menu.
Rerun the simulation.
Step 11: Compare Results
Rather than viewing the results for the T1 link alone, let us compare the results of Utilization and
Response Times for all the 4 scenarios. This will give us a broader picture of the effect of
changing the data rate.
1. Select Results Ω Compare Results…
2. To compare the utilization statistics, choose the following statistics:
3. Make sure that All Scenarios is select.
4. Click Show. To compare the Response Time, unselect the previous statistics, change the filter on
the right-hand bottom corner from As Is to average and then choose the following statistics:
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Lab 1. Internet Connect for Home Network
Here are the results
We can see from these results that as the data rate increases from 20K to 40K to 512K, the
Utilization becomes better. Also the Web Application response time becomes better.
However, the Response Time and Utilization do not get affected much by changing the data rate
from 512K to T1 line. For the current number of users, the T1 connection does not offer much benefit.
This shows that upgrading to a T1 link will not be economically feasible with the performance
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Lab 1. Internet Connect for Home Network
improvement that it gives.
Further research
So far, every scenario had step-by-step instructions. Now, here are some advanced scenarios for you
to run.

Advanced Scenario 1. Many statistics are being collected like the throughput and the
queuing delay on the WAN link. View these 2 results for the four scenarios and prepare
a brief report of your observation.

Advanced Scenario 2. Create a duplicate scenario. Change the data rate of the WAN link
between the Router and the ISP to get an average response time of 1 sec. (Hint: From the
results, we can see that the data rate might fall between 40 Kbps and 512 Kbps.) What
WAN speed did your find to give this response time?

Advanced Scenario 3. There is continuous streaming between the music server and PC1
defined by a traffic demand object. You can view this object by selecting View →
Demand Objects → Show All in the menu. Try changing the Traffic volume for this
demand. (Hint: Edit the Traffic (packets/sec) and Traffic (bits/sec) attributes of the
Demand Object.) Observe its effect on the web response time for the researcher. Briefly
describe the data values you changed and the impact on the researcher.

Advanced Scenario 4. What would happen if there were FIVE more PCs? Select and
Copy the Researcher PC. Then paste the PC. Copy more PCs in the similar manner.
Connect these FIVE PCs to the switch by copying and pasting the links connecting the
first researcher PC and the switch. Run the simulation and see view the web Response
Times of each of these PCs for all the data rates. What did you find?

Advanced Scenario 5. Here is a harder task. Add more applications to the researcher
PC and check the response time that it gets. (Hint: To add applications to a client, you
need to edit the attributes of the Profile object and edit the Profile Configuration.)
References:
http://www.opnet.com/university_program/teaching_with_opnet/textbooks_and_materials/itg_pa
nko.html
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LAB 2
LAB 2
ICMP Ping
OPNET Experiments
ICMP PING
OPNET IT Guru Overview
OPNET IT Guru is a virtual environment for modelling, analyzing and
performance prediction of IT infrastructures, including applications, servers and
network technologies.
This OPNET academic version is based upon the commercial version IT Guru 9. It
can be downloaded from the website
http://www.opnet.com/university_program/itguru_academic_edition/index.html and
used for free with some license constraints.
1. Objective
The purpose of designing this lab is to study the traces of ping in following scenarios.
 There is no failure occur in network.

There is a failure occur in network.
Fig 1.1 Network Overview
Internet Control Message Protocol (ICMP)
Internet Control Message Protocol (ICMP) provides a means for transmitting
messages from routers and other hosts to a host. It is encapsulated in IP datagram and
is used for troubleshooting the network. ICMP is used when datagram cannot reach to
its destination due to unreachable host or time to live exceeded.
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LAB 2
ICMP Ping
OPNET Experiments
2. Lab Description
Scenario consists of 7-routers-Randomised Mesh Topology-backbone with 2
workstations WS1 and WS2. WS1 sends an echo request to WS2 and WS2 will
responds with an echo reply. We will study the path of request and reply packets
went through the network. In the other scenario there is link failure occur and we will
study how does it effect on ping traces.
3. Creating Network (this step can be simplified by open an existing project)
1. Start OPNET and create a new project. File New and chose a Project.
2. Project name:
<your name>_Ping
Scenario name:
Link_UP
and Click OK.
3. Select Create Empty Scenario and click Next.
4. Select Campus and click Next.
5. Select Kilometre and X Span to 10 and Y Span to 10 then click Next.
6. Do not include any Technologies and press Next.
7. Review the values and press OK.
8. Now from menu bar go to Topology  Rapid Configuration. Select
Mesh,Randomized. Set the dialogue box appeared as Fig 1.2.
Fig 1.2 Rapid Configuration (Randomized Mesh)
9. Open the Object Palette by click
. Select Sim_Int_Model_List then
Drag & Drop two Sm_Int_wkstn workstations in the Grid.
10. Change their attributes. Right click on the station, press Edit Attributes.
Select Application Supported Profiles_ rows: 0. Repeat this process for
the two workstations.
11. Connect the two workstations to the two routers directly using 10BaseT
wires from the same palette as in Fig 1.1.
12. Rename all routers by right click on the router and selecting Set Name.
13. Now Set up ICMP traffic. Place IP Attribute Config from
internet_toolbox palette in to Grid. Right click on it  Edit Attribute 
in IP Ping Parameters_row 0, click to open Details and set
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LAB 2

Pattern: Default

Interval (Sec): 120

Packet Size (bytes): 128

Count: 700
ICMP Ping
OPNET Experiments
 Record Route: Enabled
And then Press OK to accept the changes.
14. Draw an ICMP ping demand from one to other host. Select the object of
ip_ping_traffic. It can be found from Object Palette (Internet_toolbox).
Click on one workstation (start) and then to the other one (end). Then press the
right click and select Abort Demand Definition to stop drawing wires.
To edit the attribute of ICMP demand, right click on the flow line and then
select Edit Attribute do the only change in Start Time as Constant (100).
15. Now choose RIP as routing protocol in this scenario by from the Menu Bar
of the Project Editor, Protocols IP Routing Configure Routing
Check only on RIP and press OK.
16. Again from Project Editor, Protocol  RIP Configure Start Time.
Select Mean Outcome: 10 and press is OK.
4. Configuring Simulation
1. Click on configure/ run simulation
button and configure these values.
From Common Tab set the Duration: 30 minutes and from Global
Attributes Tab and configure these values
IP Routing Table Export / Import: Export (It will export routing tables to a
file at the end).
RIP Sim Efficiency: Disable
RIP Stop Time: 1000
2. Click on Run
5. Result Analysis
Once the simulation is over,
1. Close the Simulation window by pressing Close.
2. Right Click anywhere in Grid and select Open Simulation Log. Check the
paths for Echo Message and Echo Reply, Node names and IP addresses from
the packets have gone through and hop delay. Table 2.1 shows the Ping
Report.
IP Address
192.0.14.2
192.0.5.2
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Hop Delay
0.00000
0.00020
Node Name
Campus Network.WS1
Campus Network.Borough_Road
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LAB 2
192.0.6.1
192.0.8.1
192.0.8.2
192.0.8.2
192.0.6.2
192.0.5.1
192.0.14.1
192.0.14.2
ICMP Ping
OPNET Experiments
0.00280
Campus Network.Techno_Park
0.00110
Campus Network.Perry_Library
0.00027
Campus Network.WS2
0.00001
Campus Network.WS2
0.00020
Campus Network.Perry_Library
0.00110
Campus Network.Techno_Park
0.00111
Campus Network.Borough_Road
0.00026
Campus Network.WS1
Table 2.1 Ping Report for Link_UP
6. Question
Duplicate the current scenario and named it Link_Down. Fail the link between the
routers which is used by ping in Link_UP scenario by right clicking on Link and
select Fail This Link because that link is used by Ping in Link_UP scenario. Analyze
the new result.
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LAB 3
LAB 3
LAN
OPNET Experiments
LAN IMPLEMENTATION
1. Objective
The objective this lab is to show the basic designing of a LAN using subnet, users,
switches and servers. There are two scenarios in the project.
1. Simple network with five different servers.
2. One server containing all applications which are running on five different
servers.
Fig. 1 Network Overview
2. Local Area Network
Local area network (LAN) is a communication network that interconnects a variety of
devices and provides a means for information exchange among those devices. The
scope of a LAN is small, typically a single building or a cluster of buildings. It is
usually the case LAN is owned by the same organization that owns the attached
devices. Network management responsibility for a LAN falls solely on the user. The
internal data rates of LANs are typically much greater than those of WANs.
3. Lab Description
Scenario consists of 3 subnets connected with each other by switch using 100BaseT
wire. First and Second Subnet belongs to IT and Finance Department respectively
while third one is for server.
You may load in an existing LAN model to do this experiment. Then you can
skip step 1 to 18 in the following section. However, you are expected to
investigate the performance of the LAN.
4. Creating Network (You can open an existing project)
1. Start OPNET and create a new project. File New and chose a Project.
2. Name the Project <your name>_Enterprise and Scenario name
Simple_Network and Click OK.
3. Select Create Empty Scenario and click Next.
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LAB 3
LAN
OPNET Experiments
4.
5.
6.
7.
8.
Select Office and click Next.
Select metre and X Span to 100 and Y Span to 100 then click Next.
Do not include any Technologies and press Next.
Review the values and press OK.
Now from Object Palette (internet toolbox) select
Subnet and press it three times in Grid on different place and rename them
as Fig.1.
9. Place Application Config and Profile Config from the Object Palette into
the Grid.
10. To Configure Application Config, Right Click on it  Edit Attribute
Application Definition and select 5 rows then configure each row as
written below





Row 0  Database Access (Heavy)
Description
Database  High Load
Row 1  Email ( Heavy)
Description
Email  High Load
Row 2  File Transfer (Heavy)
Description
FTP  High Load
Row 3 Web Browsing (Heavy)
Description
HTTP  Heavy Browsing
Row 4  Telnet Session (Heavy)
Description
Remote Login  High Load
11. To configure Profile Config, Right Click on it  Edit Attribute  Profile
Configuration and select 5 rows then configure each row shown in Fig 2.
12. Now rename subnet to IT, Finance and Server and then double click on IT,
you are now in the IT subnet. Change the object palette to Ethernet. Here
you place two ethernet_wkstn and one ethernet32_switch and connect
them by 10BaseT wire and rename workstations to IT_1 and IT_2 as in Fig
3.
13. Now return to higher level by pressing
button. Similarly you
configure the Finance subnet but rename workstations to Finance_1 and
Finance_2 as in Fig 4. And again return to higher level.
14. In the Server subnet, place 5 ethernet_server and one ethernet32_switch,
connect each server to the switch by 100BaseT.
15. Rename each server as Fig. 5.
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LAB 3
LAN
OPNET Experiments
Fig. 3
Fig. 4
Subnet IT
Subnet Finance
Fig. 5 Server Subnet
Fig.2 Profile Config
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Fig. 6 Application Supported
Services Table
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LAB 3
LAN
OPNET Experiments
16. Configure each server to its specific application, Right Click on Database Server 
Edit Attribute  Application: Supported Services Edit and define 1 row and
configure Database Server as shown in Fig.6. Similarly configure each server to its
specific services and return to higher level.
17. Place one ethernet32_switch here and connect each subnet by using 100BaseT
connection as shown Fig. 1 (connect to switches in each subnet). Rename this switch
to Main.
18. Save the Project.
Second Scenario
19. Duplicate the Scenario, form Menu Bar  Scenario  Duplicate Scenario and
named it One_Server.
20. Double click on Server subnet and delete 4 servers. Left only one server as show in
Fig.7.
Fig .7 One Server Scenario
Fig 8 Application Supported Services for One_Server
21. Configure all services in that server, Right Click on Server  Edit Attributes 
Application: Supported Services  Edit and now select 5 rows because you have 5
different services running & configure them as shown in Fig. 8.
22. Save the Project.
5. Choose Statistics
For testing network performance select those statistics shown in Fig. 9. Right Click on the Grid
any free area  Choose Individual Statistics and click OK.
6. Configuring/Run Simulation
For running both scenarios concurrently, Scenarios  Manage Scenarios, it will open a dialogue
box. Firstly you have to configure simulation as shown in Fig. 10. In Results column choose
collect or recollect option, Sim duration set to 30 and Time Modules to minute(s) and press
OK to run a simulation.
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LAB 3
LAN
Fig. 9 Choose Results
OPNET Experiments
Fig. 10 Manage Scenarios
7. Result Analysis
Once the simulation is over, to view and analyze the results:
1. Right click on the Grid and Select Compare Results.
2. Change As ls to time_average from bottom right part of Compare Results box.
3. To view & analyze result unfold DB Query, HTTP, Email, FTP and Remote Login for
Response time respectively.
8. Question & Answer
Q1) Compare the DB Query Response Time (Sec) in each scenario. Can you see any effect on
network?
Q2) Compare Email and FTP Download Response Time (Sec) in each scenario. Can you see
any difference?
Q3) Compare HTTP Page and Remote Login Response Time (Sec) in each scenario. Can you
see any difference?
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LAB 4 WAN Implementation
LAB 4
OPNET Experiments
WAN IMPLEMENTATION
1. Objective
The objective of designing this lab is to show the WAN implementation. XYZ company
branches are in Glasgow and Manchester while head office is in London, all the servers running
in head office. The goal is to show network performance is affected by background traffic. There
are two scenarios in the project.
1. To show network performance without background traffic.
2. To show network performance with background traffic.
2. Wide Area Network
Large geographical area is usually covered
by wide area network (WAN), requires the
crossing of public right-of-ways. Usually,
WAN consist of a number
Fig. 1 Network Overview
of interconnected switching nodes. Internal nodes routed the transmission from any one device to
its exact destination. Internal nodes are not concerned with the content of the data. Their actual
functionality is to offer a switching facility that will shift the data from one to another node until
they reach their destination.
3. Lab Description
Scenario consists of 3 offices each has CS_4500_3s_e6_sl4_tr2_adv for connection to each
other by using PPP_DS1 link. First and Second Subnet belongs to Glasgow and Manchester
office respectively while third one is for London. Branches consist of 10BaseT_LAN connected
to router using 10BaseT link. There are 4 servers running in London office and they connected
to ethernet16_switch by using 100BaseT link. It also consists of 10BaseT_LAN connected to
router using 10BaseT link.
4. Creating Network
1. Start OPNET and create a new project. File New and chose a Project.
2. Name the Project <name>_WAN and Scenario name No_Traffic and Click OK.
3. Select Create Empty Scenario and click Next.
4. Select World and click Next.
5. Select UK from the map list and click Next.
6. Do not include any Technologies and press Next.
7. Review the values and press OK.
8. Now form Object Palette: (internet_toolbox) select Subnet and press it three times in
Grid on Glasgow, London and Manchester as shown in Fig. 1.
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LAB 4 WAN Implementation
OPNET Experiments
9. Place Application Config and Profile Config from the Object Palette into the Grid.
10. To Configure Application Config, Right Click on it  Edit Attribute Application
Definition and select 4 rows then configure each row as written below

Row 0  Database Access (Heavy)
Description
Database  High Load
 Row 1  Email ( Heavy)
Description
Email  High Load
 Row 2  File Transfer (Heavy)
Description
FTP  High Load
 Row 3 Web Browsing (Heavy)
Description
HTTP  High Load
11. To configure Profile Config, Right Click on it  Edit Attribute  Profile
Configuration and select 4 rows then configure each row as Fig. 2 of Lab 2.
(Hint: configure same as in Lab 2 but not configure Remote Login)
12. Now rename subnet to Glasgow, London and Manchester and then double click on
Glasgow. You are now in the subnet. Here you place 10BaseT_LAN (from LANs) and
one CS_4500_3s_e6_sl4_tr2_adv (from Cisco, chose CS 4500, then edit its attributes,
double click on it model to set as in Fig.5 ) and connect both systems by 10BaseT wire
and rename Glasgow Office and Glasgow Router as in Fig. 2. Similarly you have to
configure the Manchester subnet as shown in Fig. 3 .
Fig.2 Glasgow subnet
Fig. 3 Manchester Subnet
13. In the London subnet, place 4 ethernet_server, one ethernet16_switch (from
Ethernet), and one CS_4500_3s_e6_sl4_tr2_adv (from Cisco Object Palette). Connect
each Server to Switch and switch to router by using 100BaseT.
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LAB 4 WAN Implementation
Fig. 4 London Network
OPNET Experiments
Fig.5 Changing Model
14. Rename the entire network for London office as shown in Fig. 4.
15. Configure each server to its specific application, Right Click on Database Server 
Edit Attribute  Application: Supported Services Edit and define 1 row and
configure Database Server as shown in Fig.6. in Lab 2. Similarly configure each server
to its specific services and return to higher level.
16. For configuring LAN of each office, Right Click on it  Edit Attribute  Set Number
of Workstation to 100, and then define 4 rows for Application: Supported Profile and
then configure each row as in Fig. 6 and press OK.
Fig. 6 Setting LAN Supported Profiles
17. Use PPP_DS1 link (in internet_toobox) connect 3 subnets’ Cisco router. Save the
Project.
Second Scenario
18. Duplicate the Scenario, form Menu Bar  Scenario  Duplicate Scenario and named
it Busy_Network.
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LAB 4 WAN Implementation
OPNET Experiments
19. Select all links in between three cities by pressing shift key. Right Click on any one 
Edit Attribute  Background Utilization and configure it as shown in Fig. 7 and tick the
box on the bottom left Apply Changes to Selected Objects and press OK you will see
on the bottom left on the Project Editor there is a message which shows 3 Object has
changed.
Fig.7 Setting Background Utilization
5. Choose Statistics
For testing network performance select those statistics shown in Fig.9. of Lab 2 but not select the
Remote Login because it’s not included in this Lab] Right Click on the Grid any where except
any node  Choose Individual Statistics and click OK.
6. Configuring/Run Simulation
For running both scenarios concurrently, Scenarios  Manage Scenarios, it will open a dialogue
box firstly you have to configure simulation as shown in Fig.8.
Fig 8 Manage Scenarios
In Results column choose collect or recollect option, Sim duration set to 5.0 and Time
Modules to minute(s) and press OK to run a simulation.
7. Result Analysis
Once the simulation is over, to view and analyze the results:
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LAB 4 WAN Implementation
OPNET Experiments
1. Right click on the Grid and Select Compare Results.
2. Change As ls to time_average from bottom right part of Compare Results box.
3. To view & analyze result unfold DB Query, HTTP, Email and FTP respectively.
8. Question
Q1) Compare the DB Query Response Time (Sec) and Email Response Time (Sec). Can you see
any effect on network with or without background utilization?
Q2) Compare the FTP Download Response Time (Sec) and HTTP Page Response Time (Sec).
Can you see any effect on network with or without background utilization?
Lab1 to Lab4 are designed to help you familiar to OPNET. Your coursework should write
on an own designed network and performance analyses of the network.
Reference:
Network Simulation Experiments Manual, 2nd Edition, Emad Aboelela, Elsevier Inc. 2008
http://www.opnet.com/university_program/teaching_with_opnet/textbooks_and_materials/index.
html
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THE ASSESSMENT OF THE LAB REPORT
IP Based Communication Networks EEB_7_883
Assignment Assessment
Student ID:
Student Name:
A+ A
A-
B
C
D
E
F
>=90
70-79
60-69
50-59
40-49
30-39
0-29
80-89
Functionality (50%)
Results (30%)
Extras (20%)
Remarks
Grade:_______
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Assessed by:________________________
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