barcode reader in asp.net c# Planning Routing and Remote Access in Software

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CHAPTER 5 Planning Routing and Remote Access
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One other useful piece of information is that the -t command-line option tells ping to continually send packets and measure responses until you terminate the command (with CONTROL-C) You can use this over time to monitor the link quality or, sometimes more helpfully, to report the accessibility of a machine while you try and fix/trace the problem the moment the machine suddenly responds, you know it s working again
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Checking Routes and Paths
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When you take a trip somewhere, do you always check that your destination is there before you start Probably not, but do you check the traffic and the roads you re going to take on the way I hope so I mean, you can phone Disneyworld before you leave to make sure it s still there, but what you really want to know is whether the roads that get you there are going to make it a 2-hour journey or a 17-hour journey The same is true of networks Although determining availability is useful, often it s the path or route to the device or machine that causes more problems You can ping a server and get a 230ms response time, but is that higher or lower than it should be If it s higher, why is it higher
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Many people think the tools here are only useful for checking Internet sites Although we ll use Internet sites to demonstrate their facilities, they are in fact general tools for determining availability and routes and have just as much relevance in a local, routed network as they do in the scope of the Internet What you need to do is check the routes and make sure that information is being routed around properly, and there are a few tools available for that within Windows Server 2003
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Using tracert
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You can determine the route packets take between two machines by using the tracert (traceroute) command The result is similar to ping, but instead of showing the response time for one machine, it shows you the response time for all the devices the packet has traveled through to make it to its destination To use, supply the name or IP address of the machine you are trying to reach For example, here s the entire trace from our office network to our hosting service:
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C:\>tracert wwwmcslpcom
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MCSE Planning a Windows Server 2003 Network Infrastructure
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Tracing route to wwwmcslpcom [663321364] over a maximum of 30 hops: 1 <1 ms 2 22 ms 3 23 ms 4 23 ms 5 30 ms 6 31 ms 7 31 ms 8 102 ms 21 191 ms [662867250] 22 176 ms 23 178 ms <1 22 24 24 30 31 31 104 ms ms ms ms ms ms ms ms <1 22 23 23 30 30 30 103 ms ms ms ms ms ms ms ms 19216811 gauss-dsl1whzennetuk [623832] chrysippus-ve-131whzennetuk [6238378] deleuze-ge-0-2-0hqzennetuk [6238081] suarez-so-0-0-0tezennetuk [6238062] ge9-0mpr2lhr1ukmfnxnet [1956622676] so-4-1-0cr2lhr3ukmfnxnet [2081851562] so-7-0-0cr2lga1usabovenet [6412531182] g50ba01b001202-2lax01atlascogentcocom gw-cosddreamhostcom [662507246] basic-argongimlidreamhostcom [663321364]
191 ms 177 ms 178 ms
191 ms 178 ms 177 ms
Trace complete
Each line shows a different device that the packet has been routed through on its way to its destination, including three individual ping times and the host name and IP address of each device You can see from this that there are big jumps between Steps 7 and 8, for example A slowdown like this indicates one of two things: either it s a slower link for example a 512Kbps line instead of a 2Mbps line or there s network saturation on that part of the link In this case, you can see from the UK and US denomination that it is just the difference due to a slower link over the Atlantic Because we re essentially using the same system as ping, it s subject to the same errors and issues You can get routing problems highlighted by a tracert, just as with ping, with some modification For example, request timeouts still indicate an inability to communicate with the device, but it s possible to have timeouts along a route while still effectively determining the route it used There are a few additional traps to look out for that ping doesn t already identify:
Repeated/bounced packets Sometimes you get repeated devices/IP addresses in the route, or the route seems to bounce between two or more addresses Usually this indicates a problem with the routing of the two devices they re each pointing to each other expecting the device to route but it can also indicate that the two devices have been configured not to forward ICMP packets Different/unexpected routes Depending on your network configuration, you may find that tracing a route to a host does not take the same route each time This could be perfectly valid if your routing metrics are the same But check the settings carefully; if your metrics
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