SpeedStream is not a “Router”, it is a DSL Router.
Effectively, it is a modem that pretends to be a Router…
So your connection is either,
Internet -> Real Modem -> DSL Router -> PC
Internet -> DSL Router -> PC
If you do happen to have a real modem, not one of those ‘partial router’ pieces of shit. Please disconnect your speedstream… Otherwise, if you need it for multiple computers, please get a real Router.