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Possible Duplicate:
Unable to resolve hostname to ip

I have a centos 5 box and can ping outside by IP but not by hostname.

For example, ping to a known server works fine using IP but not with HOSTNAME.

Any ideas how to trouble shoot this? Other computers inside the network are fine.

Thanks, Graham

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marked as duplicate by Sathya Jun 20 '12 at 18:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

What error are you receiving? hostname unreachable? – John T Dec 11 '09 at 20:48
Would you perhaps be so polite as to mark the answer as such? :) – Zsub Apr 1 '10 at 19:50

You probably have an incorrect dns server set. Check /etc/resolv.conf and make sure nameserver is your actual DNS server

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Thanks for the tip – Graham Clarke Dec 11 '09 at 21:04