Understanding TCP/IP Model Internals and Interfaces

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1508 Understanding TCP/IP Model Internals and Interfaces Main Steps • Examine network configuration • Enable ODB while running simulation • Examine 3-way handshake • Examine slow start • Examine connection termination • Print connection state (homework) • Print packet content (homework) Instructions Examine Network Configuration 1. Start OPNET Modeler. 2. Open project 1508_lab1. Scenario FTP_5000_byte_download opens. This scenario has been fully configured for you. Examine TCP configuration Both client and server are running on Windows 2000. Check that TCP Parameters attribute on both is set to Windows 2000. Please contact one of the TAs if you do not know how to do this. Examine server settings 3. What is the Slow Start Initial Count (MSS)? __________ 4. How many TCP segments will be sent after the connection is established? __________ 5. What is the TCP Maximum Segment Size? __________ Hint 1: By using the Auto-assigned symbol, we are asking TCP to calculate TCP MSS based on the MTU of the lower layer, which is Ethernet. Ethernet MTU is 1,500 Bytes. Hint 2: The size of the TCP header is 20 bytes, and the size of the IP header is 20 bytes. Examine application configuration: Client is downloading data from the server. 6. Verify that the file size is 5,000 Bytes. This is set on the Application Configuration object, in attribute Application Definitions->File Transfer - 5000 Bytes -> Description -> FTP -> File Size (bytes). 7. How many TCP data segments will be used to send 5,000 bytes if there is no retransmission? ____________ CONFIDENTIAL – RESTRICTED ACCESS: This information may not be disclosed, copied, or transmitted in any format without the prior written consent of OPNET Technologies, Inc. © 2010 OPNET Technologies, Inc. 2
1508 Understanding TCP/IP Model Internals and Interfaces Examine 3-Way Handshake Run the Simulation in ODB 1. Click on Configure/Run DES button. If you do not see the dialog box shown in the screenshot below, click on “Detailed…” to bring it up. 2. Configure the simulation to run in the ODB. a. Ensure that Use OPNET Simulation Debugger (ODB) is checked as shown below: b. Click on the Run button. OPNET Debugger Simulation Console comes up. c. If you do not see the simulation console in the upper right pane, click on “Console” tab so it appears. CONFIDENTIAL – RESTRICTED ACCESS: This information may not be disclosed, copied, or transmitted in any format without the prior written consent of OPNET Technologies, Inc. © 2010 OPNET Technologies, Inc. 3
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Understanding TCP/IP Model Internals and Interfaces

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