I have Armbian Linux and how do I add default gw (gateway or route) using this system?
Method # 1
You need to type the following command at the shell prompt
When asked select networking > IP
Method # 2
sudo vi /etc/network/interfaces
Append the following line for your interface:
# replace 192.168.1.254 with your actual router/gateway IP address gateway 192.168.1.254
Save and close the file. Restart the networking service or reboot the box. I hope this helps.