I have 3 servers in private network.
192.168.0.2
192.168.0.3
192.168.0.4
And router setting to...
192.168.0.2:2593 [Login & Serverlist, 2593 Port forward]
192.168.0.3:25931 [Pre-AOS Server, 25931 Port forward]
192.168.0.4:25932 [HS Server, 25932 Port forward]
Public IP = 123.123.123.123...