I have a Wi-Fi router which has WLAN MAC address and LAN MAC address. I can spoof WLAN MAC address easily, but can not spoof in the same way on LAN MAC address. How can I spoof the LAN MAC address?
If its not in the menu... look for settings in and export, maybe you can edit a mac cloning parameter in the resulting configfile. But most home routers allow only to spoof wan mac adress for identification by your isp.
Seems like no custom OS support like openwrt. If you find a way to get console access, you may find some kind of linux, where you can dig further into settings.