By default, all NDI channels are in the Public group, visible to all NDI clients on the same subnet.
Adding a custom Output group (Groups tab) lets others access your system’s NDI output by adding a matching entry to their Receive group list. If you remove Public from your Output groups, only systems configured to receive one of your custom Output groups will see your NDI channels.
Similarly, removing Public from your Receive groups tells your local system to ignore channels that aren’t among the remaining Receive groups.
Add entries to the Receive from IP Addresses list in the Network tab to access NDI sources from a different subnet. Note that an IP Address entry can serve multiple NDI channels (e.g., NDI Scan Converter can supply 1 channel or many more).
The channel count matters – you must ensure that, starting from port 5960 and counting up, enough network ports are available for the maximum supplied by any one NDI source – plus one (for NDI server messaging). So, adding an IP Address for a system supplying one NDI channel to the Receive from IP list means ports 5960 and 5961 must be available. A second source serving eight NDI channels would need ports 5960 – 5968 to be free, etc.