An IP address is like your physical mailing address. Once you connect a Linux distribution like Ubuntu to the Internet or a router, your system gets assigned two IP addresses. There's the private one, ...

I changed the fixed ip address in network/interfaces on server XYZ, and "ip addr" reflects the change. I rebooted XYZ. I am able to ssh to the system using the new IP addr (192.168.1.1) . However ...