I'm having issues to connect my nokia N97 to my home wi-fi. When I enter the mac address that the phone gives me into the router's configuration sheet it says that the mac address is invalid. Even though the phone doesn't have any trouble to connect to any other wi-fi net or to connect via the mobile operator net, I still think the phone's mac address is a bit odd as it starts with 18 instead of 00 like the rest of the addresses do. The router I'm using at the time is a D-link dir-025.

Any ideas or suggestions would be much appreciated.
Thanks in advance.