Farallon Communications R9100 - Manual (Page 78)

9-2 User’s Reference Guide
Network Address Translation works by remapping the source IP address of traffic from the LAN to a single static
or dynamically assigned IP address shown to the remote side of the router.
When NAT is enabled, the Netopia R9100 can use either a statically assigned IP address or one dynamically
assigned each time the router connects to the ISP. While a dynamically assigned IP address offers the ISP more
flexibility, it does have an impor tant limitation: the router requires a static IP address to suppor t Web, FTP, or
other ser vices available to the WAN. To suppor t these ser vices with NAT enabled, a ser vice can be associated
with only one machine on the LAN.
When connected to the Internet or some other large network using Network Address Translation, the individual
machines on your LAN are not directly accessible from the WAN. NAT provides an inherently secure method of
connection to the outside world.
163.167.132.1
192.168.1.100
192.168.1.102
192.168.1.103
192.168.1.104
192.168.1.105
192.168.1.106
163.167.132.1
163.167.132.1
163.167.132.2
163.167.132.2
163.167.132.3
163.167.132.3
163.167.132.4
163.167.132.4
163.167.132.5
163.167.132.5
163.167.132.6
163.167.132.6
Without NAT
With NAT
HOW NAT WORKS
ISP*
*or corporate intranet router