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When you have a domain but never leave your house
(lemmy.world)
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this post was submitted on 17 Sep 2023
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Yeah, the router ought to know that public IP belongs to a device in its own network unless you're doing stuff like running your own router behind an ISP provided router and just forwarding ports instead of maintaining IP assignment / routing tables
I think OP is referring to NAT hairpinning though.
Tell that to my opnsense box that refuses to NAT mirror.