|To do what you are trying to do the router has to have local loop-back. The only routers I have come across that have this facility are Belkin.|
The manual for D-Link routers specifically mention that this cannot be done and I imagine it is the same for most other router. You are going to have to access a local web site with a local address.
It is like trying to phone a colleague in the office down the corridor by phoning the companies outside phone number and his extension when all you need do is dial his extension number.