DDNS (Dynamic Domain Name System) is a service that allows network clients to connect to the wireless router, even with a dynamic public IP address, through its registered domain name. The wireless router is embedded with the ASUS DDNS service and other DDNS services
https://www.asus.com/support/FAQ/1011725/
I have not heard any negatives with regards to the latest firmware for the DSL-AX82U, so I would upgrade just to see how it looks and feels 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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