I am trying to setup my ISP router and my TPLink (TL-WR741N) router to share the same subnet. The ISP router is connected to a fiber optic cable (internet connection), and I'm running an ethernet cable from the ISP router LAN 1 port to TPLink router LAN 1 port. I have disabled DHCP on TPLink, and set it's IP to 192.168.1.2 since the ISP one is 192.168.1.1 . When I connect to the TPLink router with WiFi, I can ping other computers which are connected to the ISP router and the other way around I can also ping all IPs. But, I can't open any web pages. So I found out that the DNS is not working on the TPLink router. That can be fixed by manually adding DNS servers in the adapter properties on Windows.
But that's more like a quick fix. Is there any other way I can fix this on router level?
I forgot to mention that there are 2 places where I can add the DNS servers on the TPLink router. On the DHCP settings, which are disabled. And on WAN port settings which again is not used.