RT-86U Issues, Please help

[Tarou]

Hey,

So I decided to buy a new router, ASUS RT-86U.

I've set it up according to my ISP's settings and it's connected to the internet.

However, if I were to change something like my DNS to 1.1.1.1, it disconnects from the internet.
 

I've contacted Asus, they said apart from helping with setup everything else is an ISP problem.
Contacted ISP,
 

Quote

Thanks for waiting. I've completed the check on your line. The physical connection is fine and the signal for the broadband is stable. At the moment, There are no physical issues that appears to be affecting your line. Sorry Sean, for non spark supplied modem, we could provide details regarding the right set-up. And you've already tried it. If there's any issues with the modem connecting to the internet. We usually refer to the manufacturer of the device.

The range is awesome, I don't have the stability issues where there'd be no internet randomly with my ISP router, it's just WiFi speeds aren't as great as you'd expect for a $400 router hahah.

Please help me, I'm not the smartest with networking

Cheers.

[ItsTheDuckAgain]

chances are your ISP doesn't allow other than its own DNS servers to be used ...

are you fucked then? pretty much yes. sorry.

[Tarou]

4 minutes ago, ItsTheDuckAgain said:

chances are your ISP doesn't allow other than its own DNS servers to be used ...

are you fucked then? pretty much yes. sorry.

With the ISP modem I could easily change the DNS server?

[ItsTheDuckAgain]

1 minute ago, Tarou said:

With the ISP modem I could easily change the DNS server?

in that case I am out of ideas :-)

[Tarou]

2 minutes ago, ItsTheDuckAgain said:

in that case I am out of ideas :-)

Algood, there other stuff i tried to enable like QoS feature, but internet disconnected. will have to try again later and see what turns the internet off and update this post with more info