root@Net-Guard:~# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug enp1s0
#iface enp1s0 inet dhcp
iface enp1s0 inet static
  address 192.168.30.8/24
  gateway 192.168.30.1
  dns-nameservers 8.8.8.8 8.8.4.4