No men!
Only you has add one line.
Create the file:
su -c 'nano /etc/dhclient-eth0.conf'
and write:
prepend domain-name-servers: xxx.xxx.xxx.xxx
Note: xxx.xxx.xxx.xxx is DNS1 or DN2 of your IPS. ad! Save and restart "NetworkManager"
su -c 'service NetworkManager restart'
And Ready!
Enjoy! :-)
And excusme by my english is very bad. :-(