Failed: A Mediation server may have '{1}' network interfaces for the gateway (public or external) side and for the proxy ...

Failed: A Mediation server may have '{1}' network interfaces for the gateway (public or external) side and for the proxy (private or internal Lync Front End Server) side. These '{1}' network interfaces on server '{0}' currently have '{1}' unique IP addresses, but they're on the same subnet on your network. For network routing to work correctly, the '{1}' network interfaces have to be from different subnets. Each network interface must also have its own default IP gateway. There are some situations when the IP gateways and the Skype for Business Front End Servers are all on the internal network and in the same network subnet. If this is the case, it is fine to use one listening network interface for the Lync Mediation Server. For help, see the Actions pane on the right.