ISP provided modem/router combo does not have firewall option?

My ISP provided modem/router combo (Home Hub 3000 from Bell Canada) does not have a firewall setting, is this an issue for all of the devices on my network? Or is the router doing some packet filtering or something along those lines without me knowing? If anyone has this or any other Bell modem/router and is knowledgeable about the topic that would be greatly appreciated.