What IP should I listen to?

Question

Computer networks

I can't figure out which IP to listen to.
There is a server based on vibed. The task is to process requests coming to a specific subdomain. This subdomain forwards everything to the internal server, to a special port.

those. sub.domain.ru --> 123.123.123.123 port 8083 (internal server) The

question is, in order to catch incoming requests, which port / IP should I listen to?

Answer 1

If I understand correctly, you have forwarding from the external server sub.domain.ru:80 to the internal 123.123.123.123:8083.
If you want to hear requests to sub.domain.ru:80 on the internal server, then you need to listen on 123.123.123.123:8083.
Or have I misunderstood everything?