You left out some information. You said both surfaces are run “there”. Where is there? How is it connected? If there is no Dante card in the surface, then you should not plug the surface into the Dante card in the mixrack. There would be no reason to do this and would cause conflicts especially if bridge mode is enabled in Dante controller.
Long story short, he surface’s gigace ports should be plugged into the gigace ports on the mixrack. The network ports from the surfaces should be plugged into the network switch and depending on the configuration of the Dante card, the primary port should be plugged into the network switch.
Based on some of the issues you described, there may be some additional IP configuration that needs to be done to avoid IP conflicts.
