free vb.net barcode library FIgURE 31-8 Use Resource Monitor to help identify the source of network bandwidth . in C#.NET

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FIgURE 31-8 Use Resource Monitor to help identify the source of network bandwidth .
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The network utilization displayed in Task Manager and Resource Monitor only
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accounts for traffic sent to or from your computer. If another computer on your network is using bandwidth, that bandwidth won t be available to you but neither Task Manager nor Resource Monitor can show you bandwidth used by other hosts.
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1574 CHapTER 31 Troubleshooting Network Issues
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If possible, use the same application to connect to a different server . If the performance problem occurs when connecting to different servers, the problem is probably local host or network related . Performing the following steps will help you further isolate the problem . If the problem occurs only when connecting to a single server, the problem might be related to the server s performance or performance problems with the network to which the server is attached . Contact the server administrator for assistance . If possible, run the same application from a different computer on the same network . If both computers experience the same problem, the problem is probably related to network performance . The following steps will help you further isolate that problem . If other computers on the same network do not experience the same problem, it is probably related to your local computer . First, apply any updates and restart the computer . Then, install any network adapter driver updates . If problems persist, replace network cables and replace the network adapter . For more information, see 30 .
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At this point in the troubleshooting process, you have identified the network infrastructure as the most likely source of your problem . Open a command prompt and then run the PathPing tool, using your server s host name . PathPing will identify the route between your computer and the server and then spend several minutes calculating the latency of each router and network link in the path . Ideally, each network link will add only a few milliseconds of latency (displayed in the RTT column) onto the time measured for the prior link . If latency increases more than 100 milliseconds for a single link and stays at that level for following links, that link may be the cause of your performance problems . If the link is a satellite or intercontinental link, that latency is to be expected and probably cannot be improved . If, however, the link is your Internet connection or another network that is part of your intranet, your performance problems may be caused by overutilized network infrastructure . For example, if several computers are backing up their disk content to a folder on the network, a link can become overutilized, which can cause performance problems . Similarly, if several users are transferring large files across your Internet connection, other applications (especially real-time video or audio streaming, such as Voice over IP [VoIP]), may suffer . Contact network support for assistance . You might also be able to use Quality of Service (QoS) to prioritize time-sensitive traffic over file transfers . For more information about QoS, see 25 .
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If you are an administrator on a Small Office/Home Office (SOHO) network, you
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can quickly determine whether other computers on the network are causing Internet performance problems by connecting your computer directly to your Internet connection and disconnecting all other computers. If the problems disappear, another computer on your network is causing the problem.
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If the same gateway appears multiple times in the PathPing route, the network is experiencing a routing loop . Routing loops can cause performance problems or cause communicaThe Process of Troubleshooting Network Problems CHapTER 31 1575
tions to fail entirely . Networks that use routing protocols typically fix routing loops automatically; however, you should contact your network support team to make sure they are aware of the problem . The following PathPing output demonstrates a routing loop, because nodes 5, 6, and 7 repeat .
C:\>pathping www.contoso.com Tracing route to www.contoso.com [10.73.186.238] over a maximum of 30 hops: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 d820.hsd1.nh.contoso.com. [192.168.1.196] 192.168.1.1 c-3-0-ubr01.winchendon.ma.boston.contoso.com [10.165.8.1] ge-3-37-ur01.winchendon.ma.boston.contoso.com [10.87.148.129] ge-1-1-ur01.gardner.ma.boston.contoso.com [10.87.144.225] 10g-9-1-ur01.sterling.ma.boston.contoso.com [10.87.144.217] te-9-2-ur01.marlboro.ma.boston.contoso.com [10.87.144.77] 10g-8-1-ur01.natick.ma.boston.contoso.com [10.87.144.197] 10g-9-1-ur01.sterling.ma.boston.contoso.com [10.87.144.217] te-9-2-ur01.marlboro.ma.boston.contoso.com [10.87.144.77] 10g-8-1-ur01.natick.ma.boston.contoso.com [10.87.144.197] 10g-9-1-ur01.sterling.ma.boston.contoso.com [10.87.144.217] te-9-2-ur01.marlboro.ma.boston.contoso.com [10.87.144.77] 10g-8-1-ur01.natick.ma.boston.contoso.com [10.87.144.197]
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