You simply have no network connection. How did you enter the terminal mode? How to get network up:
When you are at grub boot loader screen, simply hit “e”
Navigate with the arrow keys to the line which starts with “linux”
Hit “end” at your keyboard
Put a blank and a 3 at the end of this line
Hit “F10”
login as root and repeat the zypper dup
The 3 will make sure that network interfaces get initialized and the network connection established.
