asus WL-520 gc with dd-wrt big problem

Hello,

I just bought a Asus WL-520 GC router and I upgraded to dd-wrt firmware.
My ISP assigned a static IP to my MAC address and I choosed to use mac cloneing to connect my router to my ISP's server.

The problem is the following:

My laptop connects to router (both wireless and cable) but is just a local connection, and I can't connect to the Internet.
On the other side, I can telnet to my router, and I can ping (from inside telnet connection) any website on the Internet. I can also ping my router (192.168.1.1) and work normally with router web interface.

Please help me resolve this problem.

Thank you,
Karka