Comcast router firewall?

I just got a new router from comcast, after I go to set it up I try to connect my ps3 to the router. It say's I'm success for obtaining an IP adress and Internet connection. However, it fails to connect with playstation network. I call psn and they tell me it has something to do with my firewall on the... show more I just got a new router from comcast, after I go to set it up I try to connect my ps3 to the router. It say's I'm success for obtaining an IP adress and Internet connection. However, it fails to connect with playstation network. I call psn and they tell me it has something to do with my firewall on the router and that I need to connect the IP adresses from ps3 to the router to allow Internet access. Comcast nor Xfinity is able to help me with it. So I'm wondering how do I fix my Comcast/Xfinity router firewall to allow my ps3 to have connections with PSN? I also have a Toshiba laptop, I'm not sure if that means anything.
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