[Question] Same PCs available under different subnets

[Gabry993]

Hello,
I have the following setup with ROS2 humble:
PC_A is directly connected via ethernet to PC_B.
PC_A and PC_B are also connected to the same WiFi network.
Cyclone is configured to use both network interfaces.

They can talk to each other and everything in ROS works smoothly. Also other PCs on the WiFi network can communicate with them.

My question is: how is the communication between them handled, since they can find each others on two different subnets? In my use case, I would like to prioritize the ethernet link. Does it only depend on the order in which the interfaces are specified in the middleware profile? Is there any particular issue in such a setup that I may be missing?

Thank you :)