npub1mp…j2cfx on Nostr: I don't understand when you say your isp doesn't support port forwarding. You get an ...

I don't understand when you say your isp doesn't support port forwarding. You get an IP from your isp and you can open whatever ports you want, and if you use ddns you don't even need a public IP. Where would forwarding be involved? Am I missing something from your predicament?