We have 2 servers in our LAN set up via One-to-One NAT to accept WAN calls to 2 static IP addresses. This works fine.
What we cannot do is: access various calendar and web forms on these 2 servers from within our LAN (thought they work fine outside the LAN). Attempts to call these pages/services from within the LAN directs users to the router's admin login page.
My understanding is that this model does not support "hairpinning" (essentially leaving the LAN and coming back in via the WAN).
What is the best way to achieve seamless access regardless of whether the user is within the LAN or outside of it?