https://www.youtube.com/watch?v=xuhMQIpCP1A
sudo nano /etc/network/interfaces
iface em2 inet static
address 192.168.1.xxx
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1
dns-nameservers 192.168.1.1