Hi David.
As Steve has already said, if you are using a DHCP client to configure
the interface then any nameserver addresses that the client receives
will (normally) be supplied to resolvconf, whether the DHCP client is
started by ifup or by NetworkManager. On many, many systems this is
exactly what happens.
Based on the nameserver addresses that have been supplied to it,
resolvconf writes /run/resolvconf/resolv.conf. Normally
/etc/resolv.conf is a symbolic link to /run/resolvconf/resolv.conf.
Please note that if a local nameserver is running and the loopback
address 127.0.0.1 has been registered with resolvconf then (normally)
resolvconf only lists that one address in resolv.conf. This has been
known to confuse people.
You (David) wrote:
> Trying to fix with: adding to /etc/network/interfaces
> dns-nameservers 4.2.2.2 4.2.2.3
> dns-search xyz.com
> FAIL. Because you have iface eth0 inet dhcp that option isn't read
If the interface is being configured by NetworkManager then it's true
that those options have no effect; NetworkManager does not fully emulate
ifup. The interface is configured by NetworkManager if you are running
NetworkManager and /etc/NetworkManager/NetworkManager.conf contains
[ifupdown]
managed=true
If the interface is configured by ifup then the dns-* options ARE
effective even for an "inet dhcp" interface.
If you can't figure out what's wrong with your configuration, please do
the following.
* Reboot, connect to the Internet, fix up DNS, if necessary by editing
/etc/resolv.conf by hand, then run "apport-collect 1045616" in order to supply
information about the affected system.
* Run the following commands in a terminal and post the output here.
ls -l /run/resolvconf
cat /run/resolvconf/resolv.conf
ls -l /run/resolvconf/interface
for F in /run/resolvconf/interface/* ; do echo === $F === ; cat $F ; done
ls -l /etc/resolvconf/resolv.conf.d
for F in /etc/resolvconf/resolv.conf.d/* ; do echo === $F === ; cat $F ;
done
cat /etc/resolvconf/interface-order
cat /etc/NetworkManager/NetworkManager.conf
cat /etc/network/interfaces
dpkg -l resolvconf network-manager
** Summary changed:
- DHCP server handing out DNS server but DHCP client not loading DNS settings
to client
+ DHCP server handing out DNS server addresses but DHCP client does not write
these to resolv.conf
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https://bugs.launchpad.net/bugs/1045616
Title:
DHCP server handing out DNS server addresses but DHCP client does not
write these to resolv.conf
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/resolvconf/+bug/1045616/+subscriptions
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