Chapter 9. DNS Diagnostics and Tools
Diagnosing DNS problems can be complex, made so by its interaction with other DNS systems. A DNS problem may originate locally or anywhere in the chain of name servers that provide the response to a query. Finding the location of the problem is, depending on your outlook, either the bane or the challenge of a DNS administrator's life. This chapter is divided into two parts. The first describes a number of tools that may be used to verify, support, or interrogate DNS systems—DNS utilities. The second part looks at diagnosing DNS systems, in some cases using the tools described and in other cases using methods such as log inspection and invoking debug levels to increase reporting.
DNS Utilities
There are a number ...
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