But I Tried with another Router TP-Link MR3020 and Hame MPR-A1. I can Connect to Web UI from random IP Publik but we must know what number in this problem can’t solve because IP Public from 3G (Indonesia-Telkomsel) always change if we restart router.

I tried with no-ip.com (free DNS, just free for 30Days).

the last i tried with fiber profider (Indihome/Telkom) but Gl-inet port still not opened.

whether DDNS gl-inet has a validity period ???

because my GL-inet 6416A from 2014