How to properly set up port forwarding in Ubuntu?

Question

linux

Port forwarding.
3 computers are participating (windows, Ubuntu server, Ubuntu client).
There is an apache server on the ubuntu server, on the ubuntu client machine do port forwarding using iptables, so that when you write the ip address of the ubuntu client in the browser on windows, it transfers it to the ubuntu server.
What is the correct way to set up iptables on the client for this?

Answer 1

1. check if IPv4 FORWARD is open in the kernel.
2. Google "iptables dnat", make the correct rule and run the command.
3. Ensure that the rule is saved and applied when the server is restarted.