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Sams Teach Yourself Network Troubleshooting in 24 Hours, Second Edition by Jonathan Feldman

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The Name Game: Name Service Problems

Without name services, very little works because most clients are configured with symbolic names (www.quizro.com) rather than numerics (192.168.1.1). From a client perspective, it’s usually pretty easy to rule out name server problems: You simply try to use the service using the IP address rather than the symbolic name. But from a server perspective, it’s a bit trickier.

When name services fail on a server, it’s important to realize that existing connections continue to work; it’s only the new ones that will typically fail.

A UNIX host typically performs a name lookup to whatever its name resolution host ...

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