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After I change /etc/resolv.conf, the command "host" and "nslookup" works fine, they can follow the new name server defined in the /etc/resolv.conf, but the command "gethostbyname" will still use the old name server in the old /etc/ BTW, I have a lot of error of dbus cannot connect to the audit system, I am not sure it there is any relation. As described in my previous post, Ansible is very, very powerful tool for your daily automation tasks.Maybe I'm missing something, but according to the config instructions at https://help.ubuntu.com/14.04/serverguide/all you do is update the following. The GUI that you use to edit individual connections, edits a particular file in that directory.
I found this link from Ubuntu: https://wiki.ubuntu.com/Override DNSServers It says: If you would like to override the DNS settings provided to you by a DHCP server, open but this is not recommended in certain case, a better solution is to setup correctly all the program/services using the DNS like (dnsmasq/network-manager/resolvconf/etc.) Here is an exhaustive list of setups to get back the control of and avoid having it overwritten (how to disable/setup DNS from other location other than resolv.conf) note that resolvconf is an independent program from resolv.conf, also depending on your system/config you may not have one or many of the programs listed here. auto local iface lo inet loopback # The primary network interface #iface eth0 inet dhcp iface eth0 inet static address x.x.x.x netmask 255.255.255.0 gateway x.x.x.x #nameservers # you may not need dns-search # I use it because I'm running this on a Windows network # so its useful to have # dns-search x.y dns-nameservers 188.8.131.52 184.108.40.206 directory.configuration file contains information that allows a computer to convert alpha-numeric domain names into the numeric IP addresses.The process of converting domain names to IP addresses is called resolving.Having returned home from the university today, I discovered that I couldn't connect to my home Wi Fi.I've read-up a little on $ sudo sed -i 's/dns\x3Ddnsmasq/\x23dns\x3Ddnsmasq/' \ /etc/Network Manager/Network $ echo 'supersede domain-name-servers 220.127.116.11,18.104.22.168,22.214.171.124,126.96.36.199,188.8.131.52,184.108.40.206;' | \ sudo tee --append /etc/dhcp/$ sudo service network-manager restart Thank you for your interest in this question.