Extender mode on the GL-MT3000N-V2 should work in this application. What are the IP address and Default Gateway IP address that the client gets when connected to the router’s LAN port via Ethernet?

You can also try in Router mode to port forward both TCP Port 139 and TCP Port 445 from the WAN side to the LAN IP address of the NAS.

The GL-MT300N-V2 has only 2.4GHz wifi and may not provide much NAS speed.

I do not work for and I am not directly associated with GL.iNet

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