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How to filter out foreign countries

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Hi All,
I have Merlin firmware for my RT-AX88u. I would like to block foreign countries from being able to find and hack my router.
How do i block them? I do have WAN access turned off.

But, you may do yourself more harm than good (depending on what you want/need to surf to).
If you have a public IP, you can't block anyone from 'finding' your router. CGNAT may provide some extra security here.
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