Teaching with Teaching with OPNET Software OPNET Software

TSYS Computer Science DepartmentTSYS Computer Science Department

Columbus State UniversityColumbus State University

What is OPNETWhat is OPNET

• OPNET is a network simulation tool – Model both communication networks and distributed

systems. – Analyze the performance of various networks– Comes with an integrated tool from the aspects of

model design, simulation, data collection, and data analysis.

• OPNET Technologies Ltd. Products (originally MIL3)– ITGuru: Intelligent Network Mgmt

• Scenarios and project

– Modeler

Why Teaching with Why Teaching with OPNETOPNET

– Hands-on experience in configuring, setting up and simulating simple network configurations• Increased student’s enthusiasm

– Simple to download and install IT Guru software

Evaluating Internet Connection Choices Evaluating Internet Connection Choices forfor

a Small Home PC Networka Small Home PC Network

Open Lab :1 Start IT Guru.

2 Select File => Open.

3 Select Project from the pull-down menu at the top.

4 Scroll down to the project named Home_LAN, select it and click OK.

The Simulated network opens.

Scenario 1: A slow modem Scenario 1: A slow modem downloading at 20kbpsdownloading at 20kbps

Step 2: Configure and Run the Simulation:

1 Click on the configure/run simulation button.

2 Set the simulation duration to 8 hours.

3 Click Run, monitor the progress bar as the simulation proceeds.

4 When the simulation completes, click Close.

Step 1: Configure the Link to 20kbps:

1 Right-click on the WAN link select Edit Attributes.2 Click in the Value field of the data rate attribute and select Edit.3 Enter 20000; press Enter and then click OK.

Scenario 1 Scenario 1 (cont’d)(cont’d)

Step 3: View Link Utilization:

1 Right-click on the WAN link select View Results to view the utilization results for this link.

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.

Scenario 1 Scenario 1 (cont’d)(cont’d)

Step 4: View Performance for PC2 (Researcher PC)1 Right-click on the PC2 Researcher client select View Results to view the web Responses Time and Traffic Received.

2 Expand Client Http and select Page Response Time (seconds). Also set the pull-down menu on the bottom right-hand corner to As IS.3 Click Close in the View Results window.

4 You can use the hide or show all graphs button to hide OR show graphs.

Scenario 2: A cable modem or DSL Scenario 2: A cable modem or DSL line downloading at 512kbpsline downloading at 512kbps

Step 1. 512kbps Scenario 1) Select Scenarios=> Duplicate Scenario and name the

scenario as 512k_Cable_Modem_connection. 2) Click OK.

Step 2. Configure the link to 512kbps Right click on the WAN Link and change the data rate to 51200.

Step 3. Run 512kbps Simulation Rerun the simulation. You can refer to the steps given previously for setting the duration and running the simulation.

Step 4. View Results for 512kbps Follow the same steps mentioned before to view the link utilization and response time by the research PC.

Compare ResultsCompare Results1 Select Results => Compare

Results 2 To compare the Utilization

statistics, choose the following statistics:

3 Select All Scenarios.

4 Click show.

5 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 close choose the following statistics:

RecommendationsRecommendations

• Link utilization and response timeScenario 1:_____________Scenario 2:_____________

• Cost – Dial-up line____– Cable/DSL____

• What would you recommend to the family?