Restricting incoming access to a port to only some IP adresses R7000
I host a gameserver, but i have these unwanted incoming connections that takes a little time of the server, because it has to reject these login attempts.
I would like to make a rule that says: Incoming traffic on port 20000 is only accesible from IP adress that and IP adress that. That would take a workload of my server.
Is it possible to make this kind of restrictions?