network interfaces

#ubuntu

sudo vim.tiny /etc/network/interfaces

# The loopback network interface

auto lo

iface lo inet loopback

# The primary network interface

auto eth0

iface eth0 inet static

address 192.168.31.101

netmask 255.255.255.0

network 192.168.31.0

broadcast 192.168.31.255

gateway 192.168.31.1

dns-nameserver 168.95.1.1

#sudo /etc/init.d/network-manager restart 

sudo /etc/init.d/networking restart