Ubuntu: Setup DNS Manual

sudo nano -w /etc/resolv.conf
nameserver x.x.x.x
nameserver x.x.x.x

sudo cp /etc/resolv.conf /etc/resolv.conf.auto

sudo nano -w /etc/dhcp3/dhclient.conf
prepend domain-name-servers x.x.x.x,x.x.x.x;

sudo ifdown eth0 && sudo ifup eth0

catatan:
ifconfig #cari tahu IP address
cat /etc/resolv.conf #cari tahu DNS
Ganti x dengan DNS sesuai selera misal: Google public DNS, OpenDNS dll ..