D-Link DI-206 User Manual - How Nat Works

DI-206 ISDN Remote Router

Configuration and Management

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NAT can work in conjunction with DHCP. Thus, if both are enabled

and properly configured, the DHCP server in the DI-206 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.