How to add a device with blockage to internet by default?

i got a chinese NAS,
i wanna add it to my own LAN,
but i wanna block it’s way to internet.


now i can only block it after add it,
there is a several minute window.


There aren’t support block a client before it connected in current firmware version.

I think you can disconnect internet until the NAS join to LAN and your block it.

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