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I cannot ping/reach any website/service by name (e.g. ping google.com).

I could temporarily fix this by changing 127.0.0.1 to my router in /etc/resolv.conf But that file gets overwritten.

How can I permanently fix this?

To be clear, I don't need a DNS server, I just want my server to be able to use DNS from DHCP.

Pieter
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2 Answers2

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                                        Setup Static DNS Servers in Ubuntu 12.04 (Precise Pangolin)

sudo nano /etc/dhcp/dhclient.conf

Then change the line highlighted to

prepend domain-name-servers x.x.x.x, y.y.y.y;

enter image description here

liberiangeek

Ubuntu 12.04 changes the way DNS setup is handled. Rather than adding nameservers to /etc/resolv.conf, they need to be added to /etc/network/interfaces.

Edit /etc/network/interfaces, look for your primary ethernet device (such as eth0), and add this line under your primary ethernet device:

dns-nameservers 127.0.0.1

And then restart your networking:

/etc/init.d/networking restart

virtualmin

One Zero
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  • Note that this also breaks Vagrant and you need to add this line in your config: config.vm.customize ["modifyvm", :id, "--natdnshostresolver1", "on"] –  Aug 03 '12 at 12:45
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I solved it in another way, because I have the impression the solution above is doing what was not asked, i.e. implementing a dhcp server.

I deleted the bind9 and dhcp3-server with 

sudo aptitude remove bind9 dhcp3-server

and restarted networking with

sudo /etc/init.d/networking restart

I also changed the file /etc/NetworkManager/NetworkManager.conf. Its contents looks like:

[main]
plugins=ifupdown,keyfile
dns=dnsmasq

[ifupdown]
managed=true

After modifying this file, I had to restart the Network Manager service:

sudo service network-manager restart

Now the dhcp client seems to set the dns server to the one provided by dhcp.

Pierre François
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