Debian/Ubuntu
SSH to your server.
Open /etc/resolv.conf with your favorite editor (we like vi).
Remove all lines starting with nameserver and add the following lines (replace x.x.x.x and y.y.y.y with the IP addresses you've obtained from the IP linking process:
nameserver x.x.x.x
nameserver y.y.y.ySave the file.
Your server may have openresolv or resolvconf installed, which may change the contents of /etc/resolv.conf dynamically. You can check this with the following commands:
sudo apt list --installed | grep resolvconf
sudo apt list --installed | grep openresolv
If installed, repeat the steps above for the /etc/resolvconf/resolv.conf.d/head file instead of /etc/resolv.conf.