@RandoMan That sounds like the traffic data may be passed through IPv6, while QoS only takes effect for IPv4 data. This may need to be confirmed by TP-Link @Kevin_Z

@MdRaihan22 It seems the firmware is designed in this way as stated here by Kevin.

@RakeshSarjan Which password do you refer to? If you forget the login password, the only way to find it back is to reset the router to factory defaults like this. If you don't remember your wireless...

@marcusob No, you cannot change the color on the router web page. The Color Scheme or Theme is written in the firmware code, we users cannot change it.

@Zoli21 Can you show us the error message of the grey box when trying to add the address reservation rules? Be sure that address is within the IP address pool of the router.

@HomeFileSharing It seems you are asking in the wrong community. This is the TP-Link official community, it's not the D-LINK community. Since your device model is D-LINK, you can ask for suggestions...