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TW-H6W1IR ISDN Remote Router
Configuration and Management 77
NAT can work in conjunction with DHCP. Thus, if both are enabled
and properly configured, the DHCP server in the TW-H6W1IR will
assign local IP addresses to computers on your network.
How NAT Works
In the most common NAT configuration, your network uses local IP
addresses that are not valid on the Internet. Internet (global) IP
addresses are unique, with no two devices have the same IP address.
The local IP addresses can be freely assigned to computers on your
network by your network administrator (within guidelines defined later
in this chapter and in
Appendix B, IP Concepts ). This can be done
manually or by using DHCP. The ISDN port on the router is assigned a
globally unique IP Address that is valid on the Internet, since it will be
sending and receiving data directly to the Internet and is therefore part
of it. Please study the example diagram below carefully.