Well, first make sure that your netgear is connected properly to the internet. Then take a note of your netgear's ip address. They try the DMZ setting. You may also try port forwarding instead of using DMZ.
Let me know how it goes. Good luck.
I don't know whether fibre tv would work this way as I did not subscribe to fibre tv. But try anyways, if it did not work, you can always revert back to your original setup. (ie, do the pppoe id/password on Sagemcom as your current setup_
Btw, just noticed that Rogers started offering FTTH (Fibre to the Home), which is boasting speed of 250Mbps/250Mbps download/upload in certain regions. I am excited to this new development.
I chose Bell at this stage because I ran home server and want a decent upload speed, download speed is not very crucial to me, as long as it's not below 10Mbps.
With Roger's FTTH, we could have more choices, hopefully better competition is better for us consumers.