PLANET GRT-501 - Manual (Page 30)

GRT-501 G.SHDSL.bis Bridge Router User’s Manual
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The screen will prompt the modified parameter. Check the parameters and perss Restart to restart the router
or press Continue to setup another parameters.
4.2.7 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.
Web UI Configuration