Hi
GL UI provides a single DMZ rule for the interface.
Port Forwarding - GL.iNet Router Docs 4
If you have a second WAN and plan to configure two DMZ rules, we can achieve this by creating multiple DMZ rules in Luci - Network - Firewall - Port Forwards.
Here's one example:
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Enter the Internal IP address based on actual setup, keeping all other settings the same as shown in the screenshot.
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Go to Advanced Settings tabs, Select the External IP address of corresponding WAN port (WAN1/WAN2) based on actual setup.

