vi /etc/network/interfaces
eno1, eno2 = network card name
address = IP
eno1 <= main IP
eno1:0 <= second IP
eno1:1 <= third IP
eno2 <= internal IP
:wq [save]
reboot network card:
/etc/init.d/networking restart
Ubuntu 20.04 edit IP / add internal IP
vi /etc/network/interfaces
eno1, eno2 = network card name
address = IP
eno1 <= main IP
eno1:0 <= second IP
eno1:1 <= third IP
eno2 <= internal IP
:wq [save]
reboot network card:
/etc/init.d/networking restart