I was on Optus cable and able to connect a Raspberry-pi running Pi-hole as my DNS server/ adblocker/ sinkhole. I've since signed up for the NBN and received my brand spanking new Sagemcom 5366TN router/ modem.
Can't change the DNS to point to the Raspberry-pi. Have read that a firmware update(?), admin password(?) may work. Anyone have any success?
Solved! Solved: Go to Solution.
That is a known issue that Optus have been made aware of.
You'll have to point your individual devices to the Pi-hole directly in the meantime.