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lo, you can see requests from local users for local TCP/IP services). 4. Choose other options relating to what data is captured: Count: By default, Ethereal will capture data from the moment you click OK on the Capture Preferences until you click Stop (with this value set to 0). Optionally, you can type any number into the Count field to capture only that number of packets. Filter: This optional field lets you enter a filter that can be used to filter capture data. You can type in filters individually or click the Filter button to use a filter you have stored earlier. Cross-Reference Filtering is one of the most powerful features of Ethereal. See the sidebar “Using Ethereal Filters” for further information on how to enter filters into the Filter field. File: Enter the name of a file in which you want to capture the data gathered. If you don’t enter a file name, the information is displayed on the Ethereal window without being saved to a file. Capture length: Enter the maximum number of bytes of data that can be displayed for each packet. Capture packets in promiscuous mode: Any computer on a LAN can see all packets that traverse the LAN, except for those packets intended for switched portions of the LAN. With this option on, all packets that are seen by your network interface are captured. With this mode off, only packets intended specifically for your network interface (including multicast and broadcast packets) are captured. In other words, turn on promiscuous mode to monitor the whole LAN and turn it off to monitor only your interface. Update list of packets in real time: Select this option to have packet information appear in the Ethereal window as each packet crosses the interface. With this option off, the information is displayed after you stop capturing it. Automatic scrolling in live capture: If you are updating packets in real time, select this option to have packet information scroll up after the screen fills. With this option off, you will just see the first screen of packets and have to scroll down manually to see the rest. Enable name resolution: With this option on, Source and Destination IP addresses are displayed as host names (if they can be resolved from /etc/hosts or DNS). With this off, IP addresses appear for the Source and Destination columns. 5. Click OK. Ethereal will begin gathering data on the packets encountered by the selected interface. Figure 15-11 shows an example of the Ethereal capture window that appears.
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