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PLANET Technology Corp. GRT-101/401 User’s Manual
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23
NAT/DMZ
NAT (Network Address Translation) is the translation of an Internet Protocol
address (IP address) used within one network to a different IP address known
within another network. One network is designated the inside network and the
other is the outside. Typically, a company maps its local inside network
addresses to one or more global outside IP addresses and reverse the global
IP addresses of incoming packets back into local IP addresses. This ensure
security since each outgoing or incoming request must go through a translation
process, that also offers the opportunity to qualify or authenticate the request or
match it to a previous request. NAT also conserves on the number of global IP
addresses that a company needs and lets the company to use a single IP
address of its communication in the Internet world.
DMZ (demilitarized zone) is a computer host or small network inserted as a
“neutral zone” between a company private network and the outside public
network. It prevents outside users from getting direct access to a server that
has company private data.
In a typical DMZ configuration for an enterprise, a separate computer or host
receives requests from users within the private network to access via Web sites
or other companies accessible on the public network. The DMZ host then
initiates sessions for these requests to the public network. However, the DMZ
host is not able to initiate a session back into the private network. It can only
forward packets that have already been requested.
Users of the public network outside the company can access only the DMZ
host. The DMZ may typically also have the company’s Web pages so these
could serve the outside world. However, the DMZ provides access to no other
company data. In the event that an outside user penetrated the DMZ host’s
security, the Web pages might be corrupted, but no other company information
would be exposed.
Press NAT/DMZ to setup the parameters.
If you want to enable the NAT/DMZ
functions, click Enable. Enable the
DMZ host Function is used the IP
address assigned to the WAN for
enabling DMZ function for the
virtual IP address.
Multi-DMZ: Some users who have
two or more global IP addresses
assigned by ISP can be used the
multi DMZ. The table is for the
mapping of global IP address and
virtual IP address.
Multi-NAT: Some of the virtual IP