I am using Windows Server 2012 instead of a router for my home network. Currently I am using RRAS and computers from local network can access Internet correctly.

Here is a map of the current setup:

[PC1] ---|
         |---- (lan ip)[Server](wan ip)--> internet
[PC2] ---|

I have applications running on Server, such as IIS and others. All can be accessed from internet using wan ip and from lan using lan ip. I have a domain, lets say its my-domain.com, which is resolved to my wan ip.

What I want is to enable my LAN computers to be able to connect to services on my server using the very same address as internet users: eg http://my-domain.com/. However this does not work for my lan computers.

What I understand is that I need to set up some kind of loopback route in a way that packets comming to LAN interface get routed to WAN interface. But I haven't found how to achieve this (in fact, I don't know WHAT to search for).

Feel free to ask for additional informations and I will try to update the question.