Comment # 29 on bug 1171941 from Robin Shepheard

Ok after much mucking around I have managed to narrow down the issue and find a
way to fix it.

It appears that it is not initialising the default network connection correctly
and then not saving the information to autostart the connection. 

To fix the issue and keep it functioning after a reboot I was required to
reinitialise the default network with the below command

virsh net-define /usr/share/libvirt/networks/default.xml

then to get the network connection to restart each boot 

sudo virsh net-autostart default

and then to start it in this instance

virsh net-start default

After these steps it has continued to function and starts correctly after each
boot.

I don't think that this is quite the intended behaviour as I would assume that
when installed via YaST the configuration steps would have been done.