It’s really not clear what you are trying to do !
You mention wireless but you do not say what wireless ?
What type of devices are we talking about ?
Where is WAN ?
Please post drawing of the network (piece of paper is ok) and how each device is connected to what.
Further request for info will come once that has been clarified.
To me the crucial question is: are those devices supposed to connect with each other freely (as if they were connected to same ethernet hub) regardless the side of wireless link they are?