Hello,
I use a DHCP address reservation for a specific MAC. So if a client with MAC xxxx requests an IP, the DHCP replies to him always the same IP: 192.168.1.10. That is valid for one IP only. So if the laptop is connected by LAN cable, it works fine. When he switches to the WiFi, that does not work any more, since the WiFi card has a different MAC.
Is it possible to bind two MAC addresses tot one IP? Of course these will never exist at the same time, in the network (WiFi card is automatically disabled once the LAN cable is inserted).