ZyXEL Communications EMG6765-Q10A, Руководство пользователя

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Chapter 13 NAT
EMG6765-Q10A User’s Guide
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The following table describes the labels in this screen.
13.3 Port Forwarding Screen
Use this screen to forward incoming service requests to the server(s) on your local network and set a
default server. You may enter a single port number or a range of port numbers to be forwarded, and the
local IP address of the desired server. The port number identifies a service; for example, web service is on
port 80 and FTP on port 21. In some cases, such as for unknown services or where one server can support
more than one service (for example both FTP and web service), it might be better to specify a range of
port numbers.
In addition to the servers for specified services, NAT supports a default server. A service request that does
not have a server explicitly designated for it is forwarded to the default server. If the default is not
defined, the service request is simply discarded.
Note: Many residential broadband ISP accounts do not allow you to run any server processes
(such as a Web or FTP server) from your location. Your ISP may periodically check for
servers and may suspend your account if it discovers any active services at your
location. If you are unsure, refer to your ISP.
Port forwarding allows you to define the local servers to which the incoming services will be forwarded.
To change your EMG6765-Q10A’s port forwarding settings, click
Network > NAT > Port Forwarding . The
screen appears as shown.
Note: If you do not assign a Default Server , the EMG6765-Q10A discards all packets received
for ports that are not specified in this screen or remote management.
Refer to Appendix B on page 200 for port numbers commonly used for particular services.
Table 45 Network > NAT > General
LABEL DESCRIPTION
Network Address
Translation (NAT) Network Address Translation (NAT) allows the translation of an Internet protocol address
used within one network (for example a private IP address used in a local network) to a
different IP address known within another network (for example a public IP address used on
the Internet).
Select Enable to activate NAT. Select Disable to turn it off.
Apply Click Apply to save your changes back to the EMG6765-Q10A.
Cancel Click Cancel to begin configuring this screen afresh.