Jan 17 06:40:15 localhost.localdomain mount[1299]: mount error(101): Network is unreachable
At first look it seems the network is not fully up and running during boot when the call the mount "/mnt/nas" is made. If you can delay the call till a bit later to let the network finish setting up you should be OK. Been too long since I have messed with this so procedurally I am not sure what you would need to do. Just ran into this before myself and that was the issue.