Internal IP in authserver.exe?

[Seijixi]

I am planning to play with my friends outside my local connection.

I made a DNS host for my public IP on Free Dynamic DNS - Managed DNS - Managed Email - Domain Registration - No-IP.
But my internal IP is shown in authserver.exe, isn't this supposed to be an external one?
Or is this happening because of the port forwarding I did on my router?
Is this a problem? Cause no one can connect it to my server, they get "Login Server down" (PC's on my wi-fi can connect to it though, but only by using my internal IP as their realmlist)

[Seijixi]

Can someone please clarify it for me?