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DNS entries on CentOS and how to revert back

0 votes
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I used to have opendns set up as my DNS.

network manager still has opendns IP addresses in the relevant entry of the gui. Also /etc/network/interfaces has the opendns IPs.

However, this has stopped working and I appear to be using my ISP DNS

How do I get back to my previous situation of using opendns?

posted Jul 19, 2013 by anonymous

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1 Answer

+1 vote

If you don't have "managed=true" in the "[ifupdown]" section of "/etc/NetworkManager/NetworkManager.conf"?

If you don't, NM will ignore the NIC that you've defined and set up in "/etc/network/interfaces".

How are you setting the DNS servers in "/etc/network/interfaces"? The only way that you can do so (using "dns-nameservers ...") is if you have resolvconf running and "/etc/resolv.conf" is a symlink to "/run/resolvconf/resolv.conf".

(If you don't use "dns-nameservers ...", you have to use "/etc/resolvconf/resolv.conf.d/{head,base,tail}" to set the nameservers in "/etc/resolv.conf", unless you want to use those that you get via dhcp.)

answer Jul 19, 2013 by anonymous
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+1 vote

My system is set to go directly to the OpenDNS name servers for DNS resolution. However, the results I get from "nslookup" differ from what I get if I query the same name server from another machine with the same resolv.conf settings.

That leads me to believe that DNS info is being cached locally somewhere. I don't have bind or nscd installed.

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