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Tip If your computer has more than one network interface, Network Monitor prompts you to select one of the interfaces the first time you launch the program. Afterwards, you can switch interfaces at any time by selecting Networks from the Capture menu.
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Monitoring Network Traffic
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The Network Monitor Capture window
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When you have captured enough data to the buffer, you select Stop And View from the Capture menu to display a Capture Summary window containing a list of the packets in the buffer (see Figure 6-4). Each entry in the list contains the following information:
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Frame The frame number, beginning with 1, in the order in which the packets are captured Time The number of seconds since the beginning of the captured traffic sample The hardware address of the computer that transmitted the packet Src MAC Addr
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Dst MAC Addr The hardware address of the computer that received the packet Protocol The protocol that defines the primary function of the packet Description The function of the protocol, often including values of important header fields Src Other Addr The IP address or the Internetwork Packet Exchange (IPX) address of the computer that transmitted the packet Dst Other Addr The IP address or the IPX address of the computer that received the packet Type Other Addr The network layer protocol responsible for carrying the packet across the network
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Tip By default, the size of the capture buffer in Network Monitor is 1 megabyte. You can modify the buffer size by selecting Buffer Settings from the Capture menu.
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6
Maintaining Server Availability
Figure 6-4 The Network Monitor Capture Summary window
Figure 6-5 The Capture Summary window s Summary, Detail, and Hexadecimal panes
Double-clicking one of the entries in the Capture Summary window splits the screen into three panes (see Figure 6-5), which contain the following information:
Summary The same list of frames as the ones appearing in the full-size Capture Summary window
Lesson 1
Monitoring Network Traffic
6-11
Detail The decoded contents of the selected packet in the form of an expandable tree Hexadecimal The raw contents of the selected packet, in hexadecimal notation
The Detail pane is the most useful one in this display, as you can expand any of the pro tocols in the packet to display the values of specific header fields, as shown in Figure 6-6.
Figure 6-6
Network Monitor s expandable protocol display
Using Capture and Display Filters
One of the things you learn quickly when using Network Monitor is that the tool can often provide an embarrassment of riches. Even a brief network traffic sample can con tain hundreds of packets performing many different functions, and it can be difficult to home in on the information you need. However, Network Monitor provides the ability to filter the traffic you capture and display, so that you can concentrate on specific computers or protocols. Network Monitor includes both capture and display filters. Capture filters enable you to specify which packets the program should copy to its buffer, and display filters enable you to control which packets already stored in the buffer the program displays in the Capture Summary window. You use capture filters when you want to capture specific traffic to the buffer over a long period of time. For example, if you want to examine the traffic that a server
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Maintaining Server Availability
exchanges with a particular computer over the course of an entire day, you can use a capture filter to save only the packets containing the addresses of those two comput ers. Without the capture filter, an enormous amount of data would be captured during an entire day. Display filters are best when you want to capture a relatively short traffic sample and examine in it in different ways. For example, you might capture five min utes of traffic in the buffer and then create a series of display filters to examine the traf fic generated by various protocols. To create a capture filter, you display the Capture Filter dialog box by selecting Filter from the Capture menu in the Capture window. To create a display filter, you display the Display Filter dialog box (see Figure 6-7), by selecting Filter from the Display menu in the Capture Summary window. In this dialog box, you can use Boolean logic to select the combination of protocols and addresses you want to display. When you click OK, the program modifies the display to hide all the packets that don t meet the con ditions specified by the filter.
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