The RT-AC68U router has 4 LAN ports on the back, I'll call them LAN1, LAN2, LAN3, and LAN4.
Ordinarily, if there are 4 devices plugged into the 4 LAN ports, they can talk to each other, see each other.
Is there a way for the router to segregate the device plugged into LAN1 from the others?
So...