Lesson 4 in VB.NET

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Lesson 4
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Troubleshooting Internet Connectivity
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support personnel that field such problems must be aware of the policies configured on the proxy server so that they do not waste time troubleshooting nonproblems.
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Diagnosing Internet Connection Problems
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If the individual computer is not at fault, and the NAT router or proxy server is func tioning properly, the problem might lie with the Internet access router. You can check the router to make sure that both its network interfaces are configured properly, with one connecting to the internal network and one to the WAN link providing access to the ISP. The router s routing table should have a default gateway entry that sends traffic for all but the internal networks through the WAN interface to the ISP s router. If the Internet access router is functioning correctly, the problem might be with the Internet connection itself. In most cases, the WAN connection uses a hardware device, such as a CSU/DSU, which you can power cycle or reset. This might solve the problem in some cases, but at other times the difficulty might be in the actual WAN connection. These connections always involve a service provider of some type (which might or might not be the same as your ISP), and they might experience hardware or software problems that interrupt your connection.
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Tip WAN technology problems are a likely cause of a widespread Internet access problem, as many types of WAN connections can experience temporary outages.
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Your ISP might also experience a problem that inhibits their own connectivity to the Internet, and if they can t connect, you can t either. You often hear reports (whether gen uine or not) of a backhoe operator in some other city accidentally cutting a cable, which causes a service interruption to your ISP, your WAN provider, or a major Internet backbone. In these cases, there is little to do except keep in close contact with your providers to obtain status updates and register your displeasure. This is one occasion when you might regret signing up with a smaller ISP rather than with the large, expensive company that maintains multiple, redundant T-3 connections to various Internet backbones.
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Planning Internet Connectivity
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find the answers to the questions in the Questions and Answers section at the end of this chapter. 1. A user is unable to access an Internet Web site but can access file system shares on the same LAN. Which of the following might be the problem (Choose all answers that are correct.) a. The user s computer has an incorrect IP address. b. The user s computer has an incorrect default gateway address. c. The user s hub is malfunctioning. d. The router connecting the LAN to the ISP is malfunctioning. 2. What does a troubleshooter do to determine the scope of an Internet connection problem
3. If a Web server with a registered IP address can access the Internet but client com puters with unregistered addresses cannot, which of the following components might be the source of the problem a. The CSU/DSU b. The Internet access router c. The proxy server d. The WAN connection
Lesson Summary
Reproducing the fault on other computers can tell you whether the problem is in the computer itself or in a component that affects other users as well. An incorrect default gateway address or a malfunctioning default gateway router can hinder Internet connectivity while leaving local communications intact. To determine if an Internet connection problem is caused by a name resolution failure, which could be the result of an incorrect DNS server address or a malfunc tioning DNS server, try connecting to the Internet using an IP address instead of a DNS name.
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