Looking at the screenshots of the admin panel (and the fact that pictures further down seem to show switch ports) it seems that this is a modem/router/switch combo. Unlike many providers that just provide a modem with no router functionality and just an Ethernet port.
It still would be easier to just put it into bridge mode if that's an option and use a better router, it is still an interesting hacking project!
It still would be easier to just put it into bridge mode if that's an option and use a better router, it is still an interesting hacking project!