can't connect to the internet with my airport extreme

I try to configure my airport extreme router. I can get a green light on it. I can see it with mac book (under leopard) But I can't connect to the internet. I have all green lights up to the ISP after that (internet and aonther one) I get a red light.

I try to reset the router, reset the modem, reboot..

I have no problems connecting on the net with my dlink router.



Nothing worked so far. Any idea?



Thank you





Yvon