Nice one!Accurate port forwarding on the router did the trick!
I have to say I don't understand the question here. Your router and nas are 100% in a specific private network range already, the questions is, is that range working out for you and your needs. So ask your question again with a bit more details/example.how do i enable local network access (ie. 192.168.x.x) on the router and nas? Static route on both perhaps?