generate qr code c# mvc Lesson 3: Using Network Monitor in Visual C#

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Lesson 3: Using Network Monitor
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capture traffic that does not match the parameter. For example, the filter !(tcp.port == 3389) captures all traffic except Remote Desktop traffic (which uses TCP port 3389), which is useful when logging on to a computer remotely to capture traffic.
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NOTE
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Other filter operators
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You can also use the operators AND and OR instead of && and ||.
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For example, if you were to capture traffic on a DNS server, the following filter would show all DNS traffic from the host at 192.168.10.123:
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DNS && IPv4.SourceAddress == 192.168.10.123
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The following filter would capture all Web requests for either the page named Page1.htm or Page2.htm:
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contains(Http.Request.URI,"Page1.htm") || contains(Http.Request.URI,"Page2.htm")
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If you have an existing capture, you can create a display filter based on an existing frame by right-clicking the frame in the Frame Summary window and then choosing Add Cell To Display Filter. Then click Apply. Network Monitor will show only frames that match that exact description. When creating custom filters, use the Verify button to check that your syntax is correct. The Display Filter pane will highlight any errors and allow you to correct them. For detailed information about creating custom filters, refer to the topic Using Filters in Network Monitor Help. Exam Tip
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For the exam, know how to create filters and how to capture network data at a command prompt using NMCap.
PRACTICE
Capture and Analyze Network Traffic
In this practice you will capture communications using both graphical and command-line tools and work with both capture and display filters. Exercise 1 Capture Traffic Using Graphical Tools In this exercise you must capture communications with Network Monitor. Then you will use a display filter to view only the frames you are most interested in. 1. Download and install the latest version of Network Monitor. 2. Start Network Monitor by clicking Start, All Programs, Microsoft Network Monitor 3.1 (or the current version) and then clicking Microsoft Network Monitor.
10
Monitoring Computers
3. If prompted, choose not to automatically check for updates. 4. In the Start Page tab, in the Select Networks pane, select only the network adapter that is connected to the Internet. 5. In the Capture Network Traffic pane, select the Enable Conversations check box. Then click Create A New Capture Tab. 6. In the new capture tab that appears, click the Start Capture button on the toolbar. 7. Open Internet Explorer and visit http://www.microsoft.com. After the page appears, return to Network Monitor and click the Stop Capture button. 8. Use the Frame Summary pane to examine the captured data. You should see the following sequence (each step probably generated multiple frames): ARP The computer might have generated an ARP request to identify the MAC address of its DNS server. If the DNS server is on another subnet, the computer would need to identify the MAC address of the default gateway. If no ARP requests were captured, the computer had previously cached the MAC address. DNS The computer would need to identify the IP address associated with the host name www.microsoft.com. TCP The computer establishes a TCP connection to the IP address that www.microsoft.com resolved to. This requires a total of three frames. HTTP Using the newly established TCP connection to www.microsoft.com, the computer can now query the Web site for the / URI, which is the default page. After the first HTTP requests, several other DNS queries, TCP connections, and HTTP sessions were probably captured as the computer downloaded objects embedded into the www.microsoft.com Web site. 9. In the Display Filter pane, type HTTP && IPv4.SourceAddress == IpConfig .LocalIpv4Address. Then click Apply. 10. Browse the frames displayed in the Frame Summary pane to see every HTTP request required to open the default page at www.microsoft.com. Exercise 2 Capture Traffic at the Command Line In this exercise you must capture network communications at a command prompt using a capture filter. Then you will examine the communications using Network Monitor. 1. Open a command prompt with administrative credentials and run the following commands:
cd %ProgramFiles%\Microsoft Network Monitor 3 NMCap /network * /capture DNS /StopWhen /TimeAfter 2 min /file DNS.cap
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