@Hichamq That's correct - here's the list of ethernet backhaul supported routers.

@Hichamq Make sure that both AX55 are with the latest FW release available on the support portal. AX55 supports building Easymesh with an ethernet backhaul. Follow this thread for troubleshooting a...

@Yakku AX55 doesn't support this feature. This is a list of routers supporting wireless connection to another modem/router.

@Gedikpasha Here's the title of the thread I mentioned: With the latest FW release for AX20 v3 Easymesh was added but not an ethernet backhaul:

@Gedikpasha No, but you already knew that - it's in your initial post. Here's the list of routers that support Easymesh over an ethernet backhaul. Two AX23 can build an ethernet backhaul.

@redsnowdonkey If you use the C80 in router mode you surely will introduce double NAT in your network. I would try both scenarios where C80 is in "manual" AP mode - details (Case 2) and check which...