So, i normally use 1.1.1.1 etc for my DNS servers rather than the ISP supplied ones, and for some reason, if i change them, i still seem to be routed through the ISP servers as well as the CF ones.
If i leave them set to ISP supplied DNS servers, i only get theirs listed using the below test website.
https://www.top10vpn.com/tools/what-is-my-dns-server/
Surely i should only see the Cloudfare servers if i change them and not the ISP ones as well?
Or am i not understanding how they work?

What Router do you have. When connecting to the WAN (ISP) you have a choice of accepting the Default DNS or using your own. This is the case with my Asus router. I can say no to the automatic DNS and set my own. Separately, I can set the DNS for any client in DHCP setup. Lastly, I have the option of either advertising the router DNS in addition to the DHCP DNS. Most routers will always advertise their own address for DNS, regardless of whether you have set the DNS in LAN/DHCP. IF you have accepted the automatic WAN DNS in WAN configuration, then as far as I'm aware, all Windows PC's will accept 3 DNS addresses when obtaining a lease, the ones you specify in DHCP AND the Router IP, which will then route to the ISP DNS servers. As for other devices, cannot tell you, hit and miss as to whether they accept the router DNS as well.
Edited by wiggsc00 (Mon 30-Sep-24 16:07:03)