Adding Additional Networks to Your A3
Problem: You want to have more than one network interface active on your A3 host.
Solution: Edit the /etc/network/interfaces file to add in the interfaces you need.
You have root on the A3 host (sudo password is your "alike" password) so you can make arbitrary networking changes. The A3 is an Alpine linux distribution. Network interfaces are listed under /etc/network/interfaces and by default, your A3 ships with loopback and eth0:
alike@a3h:~$ cat /etc/network/interfaces
iface lo inet loopback
iface eth0 inet static
You can edit this file using "vi" or "pico" to add additional interfaces. For more information on this topic, please consult Alpine documentation here: