After reading this chapter and completing the exercises, you will be able to:
• Describe the steps involved in an effective troubleshooting methodology
• Follow a systematic troubleshooting process to identify and resolve networking problems
• Document symptoms, solutions, and results when troubleshooting network problems
• Use a variety of software and hardware tools to diagnose problems
On the Job
A customer called the managed security services firm I worked for and asked why one of his subnets was unable to reach the HTTP proxy service that was running on the inside interface of the Linux-based firewall we managed for him. I dutifully fired up tcpdump, an open source network diagnostic utility, ...