Nokia A032 User Manual page 204

The Nokia A032 refuses any external attempts
to access your PC directly. It only accepts data
sent to the external address (the Nokia A032 is
the only device that knows how to convert the
address back to that of a device on your
internal LAN).
The NAT function normally works in
conjunction with the dial-up networking
function. Most ISPs allocate an IP address
dynamically to a computer that dials in. The
Nokia A032 uses that IP address as the external
IP address to represent your LAN.
However, an advanced feature of the Nokia
A032 is the ability to put the NAT firewall
between the wireless and wired LAN, instead of
using a modem connection.
198 Nokia A032 Advanced User Guide