14-Dec-2017, 11:06
If your router is serving DHCP to the devices then it's most likely telling them which DNS servers to use, so the settinngs are probably on your router. Anything you may have configured with a static IP address would probably have its own DNS server settings though, but that's not sounding like the case - so yes, change the DNS servers in the DHCP portion of the config on the router and reboot/restart the other devices on the network for them to pick up the DHCP server changes.
