Get online support
Hi @Eric8226 . If you have a 5Ghz wifi device or ethernet computer, login to Sagemcom and disable Band Steering (you'll have to hunt around for it). Make the SSID names different.
Or, login to old router, change it to Dynamic IP instead of PPPoE, disable DHCP and NAT, connect its WAN port to Sagemcom LAN port. Disable Sagemcom wifi if nothing is going to use it.