Chapter 8. Dial Troubleshooting ScenariosMany problems can occur through the train-up, authentication, and Point-to-Point Protocol (PPP) negotiation phases when making a dialup connection. In all cases, it is best to take a step-by-step approach through the connection until you find the area where the problem occurs. This book cannot cover the details of all that can occur in the case of train-up failures or slow speed connections, but it does provide many helpful hints, tips, and tricks to assist with dial troubleshooting. The authentication and PPP negotiation stages can be resolved to the point of finding the exact cause of the problem almost every time. In certain cases, the provider or telephone company (telco) might be required to fix the issue. Five troubleshooting scenarios are provided in this chapter. Each scenario covers the most common troubleshooting issues that occur and how to pinpoint the exact causes of the problems. Following the scenarios are frequently asked questions with answers that can help you with common troubleshooting issues that don't always have clear solutions, or that have causes that cannot be pinpointed without more expertise. The topics covered in this chapter are as follows :
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