Just a heads up, in some cases, routers may have a function or feature enabled called Filter WAN NAT Redirection or something along those lines which will basically not allow you to use your Public IP from within your LAN; it can typically be located or found under Security and/or Firewall (or something else along those lines) and would likely be the reason why you are unable to do anything having to do with your Public IP from within your LAN.
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