Hongqi. Ask Intranet port tabing for a single Nic iptables

Hongqi. For more information about how to map a single Nic iptables port to the Intranet-Linux general technology-Linux technology and application, see the following. The situation is as follows:

Intranet:
2 machines:

A: ordinary PC with web Service, IP Address: 10.36.1.123 port: 80
B: lunix Suse host, also comes with a web service, IP Address: 10.36.1.41 port: 80


In special cases, port 80 of the Intranet address of machine B is mapped to the public network by the router. The address is 202.103.18.99.


How can I set iptables for a single Nic on host B.

So that machines on the public network can access the web Service of machine A on the Intranet by accessing the Internet address of machine B?

For example, public network access 202.103.18.99: 8001
Automatically jump to 10.36.1.123: 80 of Intranet


Thank you for your support!