Hmm.. that is strange. The router will be having 2 interface. One facing the service provider which will have the static ip address and the other one the private network having 192.168.x.x ip address range. The router should also be acting as your DHCP server for your internal networ. When you do an ipstat on your laptop which is connected directly to the router, you will get details only of the private network in which the router will be acting as the default gateway. If the ip address you have given is correct, it should be 192.168.15.1. If you find something else, try changing the TCP/IP settings on your laptop. Probably, it was configured with a static ip address(?).