To redirect specific requests to a specific address on the internal network, use dst-nat, follow the steps below:

  1. Once connected to the machine, select WebFig;
  2. Go to IP, Firewall section;
  3. Open the NAT tab;
  4. Create a new record by pressing Add New;
  5. A new window will open and fill in the following fields:
  6. Chain, choose dstnat because the IP address of the recipient will be changed;
  7. Select a protocol such as TCP;
  8. Dst. Port, specify the port that will be forwarded, for example port 80;
  9. In. In the Interface List, indicate the incoming interface to which the specific rule will apply, in this case it is WAN;
  10. Go to the bottom of the page, to the Action section;
  11. Action, select dst-nat;
  12. Enter the desired address to which you want to forward the data;
  13. Enter the required port.

This established rule can be translated as follows: When an incoming connection with the TCP protocol requests port 80, translate the recipient's address and redirect it to the local address and port 80.