How do I stop my Xfinity modem/router from changing the DNS setting on my Macs?
My Xfinity/Technicolor CGM4140COM modem/router does not appear to provide a way to configure a DNS for my home network (4 Macs + other devices). So, on each of my Macs, I've tried using System Preferences > Network > Advanced > DNS to specify my preferred DNS servers. When I click the Apply button, my DNS settings appear in the Network panel.
However, after a period of time (anywhere between 1 second and 1 to 2 hours), my DNS settings revert to the Xfinity defaults. Is there a way to stop this?