Not to ask a possibly silly question but I haven’t seen these questions asked and I don’t know your network experience. You’ve supplied the actual network address of your pihole machine and not the 192.168.1.250 address shown, right? And you’ve set your pihole server up to have a static ip address as well, correct? You don’t want it assigned dynamically and therefore randomly everytime it renews its lease.
If the ip address is statically assigned - either hard-coded as static on the machine or at least being statically assigned on your router via its mac address - then setting the dns server on your router should work. I would however assign 2nd and 3rd dns servers as Google dns or cloud flare ip addresses in case your pihole server is ever down. (1.1.1.1, 8.8.8.8 or some of the others). If that’s all confirmed and your machines are not receiving your configured dns settings from the router, it’s possible (seems unlikely) the spectrum supplied router is ignoring the settings and assigning their dns servers. If so, buy your own router and put it between your home network and the spectrum hardware. Then you have control and it doesn’t matter what their hardware does. You’ll just set yours up on a different subnet - 192.168.x where x doesn’t match the same value as the spectrum network - and you should be good to go.
Not to ask a possibly silly question but I haven’t seen these questions asked and I don’t know your network experience. You’ve supplied the actual network address of your pihole machine and not the 192.168.1.250 address shown, right? And you’ve set your pihole server up to have a static ip address as well, correct? You don’t want it assigned dynamically and therefore randomly everytime it renews its lease.
If the ip address is statically assigned - either hard-coded as static on the machine or at least being statically assigned on your router via its mac address - then setting the dns server on your router should work. I would however assign 2nd and 3rd dns servers as Google dns or cloud flare ip addresses in case your pihole server is ever down. (1.1.1.1, 8.8.8.8 or some of the others). If that’s all confirmed and your machines are not receiving your configured dns settings from the router, it’s possible (seems unlikely) the spectrum supplied router is ignoring the settings and assigning their dns servers. If so, buy your own router and put it between your home network and the spectrum hardware. Then you have control and it doesn’t matter what their hardware does. You’ll just set yours up on a different subnet - 192.168.x where x doesn’t match the same value as the spectrum network - and you should be good to go.
Good luck!