@Marvin_S Thanks for your suggestion. I already have reset the router 3 times but still cant connect to Cloudflare. And apparently i also cant connect to quad9 dns and any other dns that have low...

Hi, i cant connect to internet by changing DNS to Cloudflare 1.1.1.1 family either from DHCP settings or Internet settings. But, using default DNS from ISP or any other DNS like google i can connect...