David,
Thank you very much for your reply.
How do I make sure that the firewall is properly set up? Is there a FAQ or an online guide about the firewall settings and other functionality of this modem?
Thanks
menguc

How do I configure the router to restrict access to other machines.
I entered my mac's Airport ID number in the Access Restrictions page to the PC's list. And check Allow box.
is there anything else I need to do?
Is the Airport ID # the same as the MAC number?
Thank you very much for your help
menguc