Tricky, as most people have a home internet router, so the external IP address will be that. The method will be to use port forwarding.
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OK
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This is what needs to be done when one has an internet router in one's shack and wants to operate remote from a comfy bedroom. -- ww6x
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No, assuming your shack and 'comfy bedroom' are behind the same home router, port forwarding is not required. Port forwarding is required to access your device behind the home router from the public Internet outside your home (like a coffee shop).