Web hosting solutions - You can filter for certain special activities on
You can filter for certain special activities on the network, using such things as the gateway, broadcast, or multicast primitives. Entering gateway host lets you find packets sent to a gateway host that is neither a Source nor Destination for the packet (which is determined because the Ethernet address doesn’t match either of those IP addresses). Enter ether broadcast to monitor broadcast packets on your Ethernet network, such as announcements from name servers announcing availability. Likewise, you could filter for multicast packets on ether or ip protocols (ether multicast). Interpreting captured Ethernet data With the captured data displayed in your Ethereal window, you can get a detailed view of the network traffic that your computer is exposed to. The Ethereal window is divided into three parts. The top part contains a scrollable list of packets. The protocol tree for the current packet appears in the middle part of the display. A hexadecimal dump of the entire contents of the packet appears in the bottom part. You can sort data in different ways from the top part of the window by clicking on the column headings. To see more details relating to different items in the protocol tree for the current packet, you can click the plus sign next to the protocol information that interests you. The following are some tips that will help you interpret what the data means: The Source and Destination columns show where each packet came from and where it went. If the Enable name resolution option is on (which is recommended), the host name associated with IP packets is displayed. This makes it much easier to see which computer is communicating with you. To see all activity associated with a particular location, click the Source or Destination column. Packets will be sorted alphabetically, making it easier for you to scroll through activity for the location that interests you. If you are trying to debug a particular feature, you may want to click the Protocol column to gather activities based on protocol. For example, if you were trying to get Samba to work (for Windows file or printer sharing), sorting by protocol would enable you to see all NetBIOS and NBNS (NetBIOS name server) requests that came to your computer. To mark a packet of interest to you, click the middle mouse button on it. This will highlight the packet, making it easier to find later. (If you only have a two-button mouse, and you indicated during installation that it should emulate a three-button mouse, you can click both mouse buttons together to emulate the middle mouse button.) The Info column gives you details about the intention of the packet. For example, you can see the type of service that was requested (such as http for Web service or FTP for file transfer). You can see what information is being broadcast and determine when attempts to find particular host computers are failing. If you believe someone is using your network improperly, you can see which sites they are visiting and the services they are requesting. Another handy option is one that lets you follow the stream of TCP information. Click Tools Follow TCP Stream. The “Contents of TCP stream” window that appears lets you see the total output of the HTTP, SMTP, or other protocol being used.
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