Sorry, we coulldn't be more help.
Cheap NAT routers have the ability to "DMZ" a single IP address on the private LAN; because the port numbers are not needed in that situation. Every incoming TCP or UDP packet that is not in the state table is simply redirected to that single IP address.
In your situation, you have a DMZ subnet. So you would need to know your ports or port ranges, to direct traffic to the appropriate device on that subnet.
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