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
The App uses DDNS but I seem to remember back in the day this enabled something which allowed Admin access from internet (I will have a look at my old notes) and a few ASUS routers got hacked
Updated : FYI – https://www.snbforums.com/threads/asus-router-app-and-unintentional-activation-of-remote-access-to-router.44181/
In a completely sane world, madness is the only freedom (J.G.Ballard).
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