@sagar002100 Archer C6 is a home wireless router and I doubt that it can handle such number of client devices. I would recommend to get a business grade router for an internet gateway like one of...

@Drdiamond You wrote " I can ping websites via diagnostic menu. " That means the router has internet access itself but not your client devices - is that correct ? This router model is usually...

@Wasilewskiii RE330 is most probably working in proxy mode. Check this FAQ proxy mode description to see if that could help resolving your issue.

@Drdiamond In general your settings seem fine. Get rid of these optional settings: Restart XC220-G3V, then your mobile and test again.

@tarekitsme Yes, your topology description does makes sense and this should work as exspected. Talking about the wireless and wired speed - there's only one rule here - nothing can beat the cable in...

@Luca5chv Leave the settings as they are. De nada.