How to Open your Nat Type for the Xbox 360. I don't know if this works for the PS3 but i'm sure you would have to do the same process with the PS3's IP and Mac Address.
If you router's page does not look like me see if you have the same options as mine does - DHCP Reservation, Port Forwarding, UPnP, and SPI Firewall.
I'm not an IT Specialist, all this information was gather though a tech support representative of Linksys. If you have any other question about your router here's where you can get them - http://www.linksysbycisco.com/support
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