I have a Windows Server 2012 R2 with AD, DNS, DHCP, IIS.
I am hosting a domain example.com and have one public IP from my ISP.
Port 80 is forwarded to IIS server. I have a NAS server and created a host name (nas) in DNS Server, pointed it to NAS private IP and I can access it locally via nas.example.com
Now I want to be able to access nas.example.com from outside of my own network.