HI There,
i am not sure whether you managed to solve the problem or not. I am having the same problem myself. The ISP service works with my PC but NOT with my Macintosh nor Airport Extreme. I called Apple and they suspect that it has something to do with the Media Access Controller of the modem that was provided by PCCW/Netvigator. But when I called PCCW/Netvigator, they say that their modem is just a common modem and there is nothing to configure.
I have spent full 24 hours to rectify this, short of buying a new Router (fingers crossed, hopes it works).
Please please, someone with the same problem, if you have managed to solve the problem, please kindly advise.
Thanks!
Laurie