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D. NAT
Configuration
The NAT (Network Address Translation) selection allows multiple users at your local site to
access the Internet through a single Public IP Address or multiple Public IP Addresses. NAT
provides Firewall protection from hacker attacks and has the flexibility to allow you to map Private
IP Addresses to Public IP Addresses for key services such as Websites and FTP. To meet
various field applications, the On-Q Router/Switch NAT function can be disabled allowing it to
function as a regular router. If NAT is disabled, all LAN side workstations must have valid IP
addresses for Internet access. If the On-Q Router/Switch is strictly used for a routing application,
not for Internet access, then and only then should the NAT function be disabled.
Use the Virtual Server function (see
Figure 22
) when you want different servers/clients in your
LAN to handle different service/Internet application types (e.g. email, FTP, Web server etc.) from
the Internet. Computers use numbers called port numbers to recognize a particular
service/Internet application type. The Virtual Server allows you to re-direct a particular service
port number (from the Internet/WAN Port) to a particular LAN private IP address and its service
port number.
Figure 22
