Belkin 54g User Manual page 40

ALTERNATE SETUP METHOD
Configuring your WAN Media Access Controller (MAC) Address
All network components including cards, adapters, and routers, have a unique
"serial number" called a MAC address. Your ISP may record the MAC address of
your computer's adapter and only let that particular computer connect to the
Internet service. When you install the Router, its own MAC address will be "seen"
by the ISP and may cause the connection not to work. Belkin has provided the
ability to clone (copy) the MAC address of the computer into the Router. This
MAC address, in turn, will be seen by the ISP's system as the original MAC
address and will allow the connection to work. If you are not sure whether your
ISP needs to see the original MAC address, simply clone the MAC address of the
computer that was originally connected to the modem. Cloning the address will
not cause any problems with your network.
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