Modem connects to interwebs, router won't let my comp connect!

Hi guys,

I recently bought a DIR615 router and I'm having trouble getting the internet working through it on my desktop and laptop, however my PS3 connected hassle free.

The first thing I tried doing was changing my modem from PPPoA to PPPoE to suit the router and I finally got a connection established that way, supposedly, however when I try pinging common sites via the routers interface, it won't return anything.

However, before I fiddled with the settings, the modem plugged in fine and the internet worked with the PS3 using the DHCP settings I believe.

Any ideas?