Nokia M10 - Manual (Page 14)

Nokia M10 User’s Manual
DRAFT
E Copyright Nokia Telecommunications Oy NTC C33539002SE_A0 2-2
2.1.1 Internet access using NAPT router
M10 can connect your PC via your operator’s Digital Subscriber Line
Access Multiplexer (DSLAM) and ATM network to an Internet
service provider (ISP). If you are connected to a single ISP the network
addresses (IP addresses) in your home can be part of the ISP’s IP
address range. However, in many cases it is more practical that the
home network is an independent network utilising private IP addresses
which are not visible to outside and that M10 has only one external IP
address received from the ISP. The external Internet services are
accessed through this single IP address. This mode of operation is
called the Network Port Address Translation (NAPT).
The benefits of NAPT are the minimum coupling of the ISP and the
home network, the saving of public IP addresses, and in–built simple
firewall functionality.
LAN
Nokia M10
10Base-T
ATM
network
Internet
ISP Router
DSLAM
Home
network
Home
network
Home
network
Figure 2-1 Internet access using NAPT router