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If you can communicate by the IP address but not the DNS name of a system, then you most likely have a name resolution problem Check the IP address you have configured on the system as the DNS server entry If you have the wrong subnet mask typed into the TCP/IP properties, this could cause miscommunication When you check the IP address of a system, also verify that you are using the correct subnet mask Loops on the network will typically bring the network down This is why Cisco switches use the STP protocol: it is a protocol that prevents loops by placing one of the ports in the loop in a blocking state If you have intermittent problems with the network where systems seem to just lose connections, then it could be a loop issue Check how you have everything wired and remove the cable that creates a loop If you find all clients on the network cannot communicate with systems on another network, then you most likely have a routing problem Check the routing table on the router and ensure there is a route to the network you are trying to reach There are a number of potential wireless issues Your wireless client could have connected to the wrong wireless network automatically Check to ensure that you are connected to the correct wireless network If you are losing your wireless connection a lot, then you most likely are getting interference from cordless phones or the microwave
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network troubleshooting resources
Once you have determined the cause of your network problems, the battle is only half over You still have to figure out how to fix the problem In many cases, the solution, such as replacing a bad cable, might be obvious However, in other cases additional solutions could be required Resources are available to help in your search for the solution to your problems Let s look at a few of those resources now
Network Troubleshooting Resources
technet
TechNet is a Microsoft product that is distributed on a monthly basis to its subscribers TechNet is a searchable database of all Microsoft s articles and documentation on nearly all its products Because there is a really good chance that someone else has already had the same problem that you are having, TechNet is likely to contain some documentation about how others have solved the problem that can help you solve yours Microsoft has a version of TechNet online at wwwmicrosoftcom/technet that you can visit and search for articles and consult a knowledge base for most of the problems you encounter with Microsoft products
Manufacturer Web sites
The World Wide Web has simplified network troubleshooting tenfold The web enables us to find up-to-the-minute information on both hardware and software If you are having a problem with a NIC that is not properly communicating on the network, a good place to start is the web site of the NIC s manufacturer Most sites provide troubleshooting information, suggested steps to resolve common problems, phone numbers with which you can contact technical support, and the latest updated drivers Figure 13-5 illustrates the Microsoft Technical Support web site s interface
figure 13-5
The Microsoft Support web site
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Troubleshooting the Network
resource Kits and Knowledgebase
Resource kits provide a wealth of information about your operating system, including technical information that is not available anywhere else Resource kits contain additional documentation on your operating system that is too comprehensive to cover in the standard documentation Whenever you are faced with a problem that you cannot solve, check the resource kit s knowledgebase articles your problem could already have been solved
trade Publications and White Papers
Other excellent sources of information are trade publications and white papers These documents provide valuable information on current techniques and new practices that cannot be acquired anywhere else In the event of actual network problems, these publications will probably be of little direct use to you, but the information you absorb over time from reading them will become one of your most helpful tools
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