OK, I've got my USB WLAN adaptor working, but I can't seem to ping the router or use it to access our internet connection here. I've tried looking through FAQs that seemed appropriate, I've tried aproposing and looking at as many man pages as I thought were relevant, but I'm nowhere. The WLAN adapter can find the access point, but doesn't get any further.

Can anyone point out where I should be looking for this? I'm not even sure what's stopping it - I'm a complete Linux newbie (although I can handle myself on a CLI). Any particular FAQs I might've missed, any HOWTOs, anything at all?

By the way, I'm using a non-static IP for my internet connection, and as per usual the router is assigning intra-network IPs.