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Chapter 10 NAT
LTE3301-M209 User’s Guide
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10.2 General Screen
Use this screen to enable NAT and set a default server. Click Network > NAT to open the General screen.
Figure 57 Network > NAT > General
The following table describes the labels in this screen.
10.3 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.
Table 37 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.
NAT Loopback NAT loopback allows local users to use a domain name to access a server on the local
network. A packet sent to the public (WAN) IP address is always forwarded to the default
gateway (the Zyxel Device). With NAT loopback enabled, the Zyxel Device uses the WAN
interface’s IP address as the packet’s source address and treats the packet as if it came
from the WAN interface. The packet then can be forwarded to the local server according
to the port forwarding rule.
Select Enable to activate NAT loopback. Select Disable to turn it off.
Apply Click Apply to save your changes.
Cancel Click Cancel to begin configuring this screen afresh.