How to configure ORBI in router mode for vnc connections

Let me try to clarify my set up and what I'm trying to accomplish.  My ISP is Spectrum, and I have two RBK752 setups (each with a  RBR750 unit and a RBS750 satellite).  Prior to this point the orbis were both set up as access points, so everything behaved as one big network.  I have several pcs and other devices connected.  In the past I have used vnc connections to have one of the pcs view and control other pcs remotely.  This has worked ok except for the amount of traffic on the network which can affect other people on pcs (response time degrades).  So I thought I could isolate the vnc traffic by having one orbi setup act as a controller, and isolating the vnc-using pcs on this orbi.  I was able to switch one orbi to being a router instead of an access point and connect multiple pcs to this orbi (each now with a 10.0.0.x address).  If I open a Windows command window and enter the command "arp -a", I can see the ip addresses of all of the pcs connected to this orbi.  However, I cannot  establish vnc connections between these pcs as I have done in the past.  I presume the router is somehow blocking the connection attempts, perhaps based on the port or perhaps based on the protocol used in a vnc connection.  I would like to find out how to clear up the problem so I can use this network as desired.  Any help would be appreciated.