Photography web hosting - Figure 15-9: Configure your Ethernet card for TCP/IP
Figure 15-9: Configure your Ethernet card for TCP/IP during installation. The primary function of Ethereal is to take a snapshot of the packets coming across your network interfaces and display that data in the Ethereal window. You can filter the data based on a variety of filter primitives. When the capture is done, you can step through and sort the data based on the values in different columns. Optionally, you can save the captured data to a file to study the data at a later time. Tip If you can’t use Ethereal because you don’t have a GUI available, you can use the tcpdump command from the shell. It is not as friendly as Ethereal, but it supports the same filtering syntax. Because tcpdump can produce a lot of output, you will probably want to use some form of filtering and/or direct the output of the command to a file. (Type man tcpdump for information on filter options.) Capturing Ethernet data With the Ethereal window displayed, you can capture data relating to packet activities on any of your Ethernet network interfaces by doing the following: 1. Click Capture. 2. Click Start. An Ethereal Capture Preferences window appears, as shown in Figure 15-10. Figure 15-10: Choose preferences for capturing Ethernet data from the Ethereal window. 3. Click the down arrow next to the Interface box, to see what interfaces are available, and select one. If you have an Ethernet card installed, select eth0 to choose to capture data for packets being sent across that card. You can also choose to monitor the lo interface, to watch the loopback driver. (By choosing
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