Simple enough for some but ‘really simple’ : static DHCP, BlueIris webserver, IIS reverse proxy with a documentation link to nginx as well 
Personally I run dynamic IP at the client and use a reasonable DHCP server so I can ‘simulate’ static and allocate a fixed IP for recognised devices. That way I can centrally control all the devices on the network without having to change client configs which can be tricky to impossible with many different OS devices. Also if I decide to change the structure or someone changes a phone I’ve only got to edit one DHCP server.
Yes do look at the ipconfig results. Server software like OH is only going to ask the local system for a list of ‘interfaces’ it can bind to:
[g.eclipse.smarthome.core.net.NetUtil] - Found multiple local interfaces - ignoring 192.168.1.115
that message indicates it found more than one and it didn’t pick 192.x. like you might have preferred.
If you need the other interfaces then selective IP binding is your only choice. Maybe read this binding thread. Would recommend reading top to bottom and then picking from the bottom to ensure most recent and relevant answers re OH2.