Exercise 2: Creating a Network Capture in Network Monitor in Visual Studio .NET

Drawing Code-128 in Visual Studio .NET Exercise 2: Creating a Network Capture in Network Monitor

Exercise 2: Creating a Network Capture in Network Monitor
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In this exercise, you capture and view traffic using the Network Monitor tool. 1. While you are logged on to Computer1 as Administrator, open Network Monitor by clicking Start, selecting Administrative Tools, and then clicking Network Monitor. The Microsoft Network Monitor dialog box appears, indicating that you should specify a network on which to capture data. 2. Click OK. The Select A Network window appears. 3. In the Select A Network window, expand the Local Computer icon in the left pane. The network adapters and modems available on your local computer are displayed. The modem connection is named Dial-up Connection Or VPN. 4. Select the network named Local Area Connection, and then click OK. The Microsoft Network Monitor tool opens, displaying the Capture window asso ciated with the network adapter you have just selected. 5. In the Capture window, click the Start Capture button on the toolbar. 6. Open a command prompt. 7. At the command prompt, type ping computer2 and then press Enter. This com mand is used to test network connections. You will see four lines of output resembling those shown in Figure 3-7. This output demonstrates that Computer1 and Computer2 are communicating on the network segment.
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Lesson 1
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Analyzing Traffic Using Network Monitor
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Figure 3-7 Ping output
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8. After the output has completed, switch to Network Monitor and click the Stop And View Capture button on the toolbar. Alternatively, to perform this step you can press Shift+F11. The Frame Viewer window opens, named Capture: 1. The word Summary also appears in parentheses, indicating that the summary pane, which is the only visi ble pane, is the active pane in the window. The purpose of the summary pane is to list in order all of the frames you have just captured. 9. Double-click any one of the frames listed in the summary pane. The Frame Viewer window opens two additional panes: the details and hexadec imal panes. These panes provide more information about the frame you have just double-clicked. 10. Double-click again any one of the frames listed in the summary pane. The details and hexadecimal panes disappear. You can toggle between the one-pane view and the three-pane view by double-clicking a frame in the summary pane. 11. From the File menu, select Save As. The Save As dialog box appears. 12. In the File Name text box, type Ping Capture, and then click Save. The Ping Capture.cap file is saved in the \Desktop\My Documents\My Captures folder. 13. From the File menu, select Close. The Frame Viewer window closes, revealing the Capture window again in Network Monitor.
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Exercise 3: Saving a Frame to a Text File
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In this exercise, you copy the contents of a packet into a text file. Perform the exercise in Network Monitor while you are logged on to Computer1 as Administrator. 1. From the File menu, select Open. The Open dialog box appears, displaying the Ping Capture.cap file in the My Cap tures folder.
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3-16
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3
Monitoring and Troubleshooting TCP/IP Connections
2. Select the Ping Capture file, and click Open. The Ping Capture.cap file appears in the Frame Viewer window. 3. In the summary pane, find a frame that lists ICMP under the Protocol heading. 4. Select this ICMP frame. 5. Press Ctrl+C to copy the frame. 6. Open the Notepad utility in Windows. The Untitled Notepad window opens. 7. In the Untitled Notepad window, press Ctrl+V to paste the frame into the new text file. The complete data contents of the copied frame are pasted into the window. Notice how the first line contains all of the fields, in sequence, of the summary pane in the Frame Viewer window. Next, the bulk of the pasted output, about 40 lines, corresponds to the information from the details pane in the Frame Viewer window. Here, all of the details pane information is expanded, and none of the protocol headers are collapsed into a summary form. Finally, the last group of lines of the pasted output represents the hex data from the hexadecimal pane of the Frame Viewer window. 8. In Notepad, press Ctrl+S to save the file. The Save As dialog box appears. 9. Using the navigation buttons and folder icons available within the dialog box, adjust the target folder so that the file will be saved in \Desktop\My Docu ments\My Captures. Do not save the file yet. 10. In the Encoding drop-down list box, select Unicode. 11. In the File Name text box, replace *.txt by typing ICMP frame, and then click Save. 12. Close the ICMP Frame.txt Notepad window. 13. In Network Monitor, from the File menu, select Exit to quit Network Monitor. If you are prompted to save entries in your address database, click No. 14. Log off Computer1.
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