How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)

Posted by Witek on Ask Ubuntu See other posts from Ask Ubuntu or by Witek
Published on 2013-10-30T10:56:19Z Indexed on 2013/10/31 10:21 UTC
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Filed under:

networking

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13.10

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network-manager

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dns

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resolv.conf

After upgrade to 13.10 my DNS resolving fails. It seams the DNS servers which I get by DHCP (LAN) are not used.

I could temporary solve the problem by adding nameserver 8.8.8.8 to /etc/resolv.conf. But then the intranet hosts still can not be resolved.

When clicking on the Connection Information menu item on the network indicator, the Primary DNS and the Secondary DNS are set correctly. But my computer seams not to use them.

So my questions:

What should I put into resolv.conf, if anything?
How to find out, which name servers my computer is querying?
Where to look next, to find out, why name servers received by DHCP are not used?

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