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I have been searching a lot on how to enable QoS in my AC900 (model Archer C25), and there is no way I can do it properly because I can't find the option to disable NAT boost, which is needed in order to enable QoS (this need is written in the "?" buttons inside the router interface). The only option is to disable NAT, and this one makes my computer unable to access the internet.

How one can disable this "NAT boost" thing in this router model?

Thanks