ZyXEL Communications MAX-207HW2, Руководство пользователя

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Chapter 8 The NAT Configuration Screens
User’s Guide
91
8.3 Port Forwarding
A NAT server set is a list of inside (behind NAT on the LAN) servers, for example,
web or FTP, that you can make accessible to the outside world even though NAT
makes your whole inside network appear as a single machine to the outside world.
Use the ADVANCED (
進階
) > NAT Configuration (NAT
設定
) > Port
Forwarding screen to forward incoming service requests to the server(s) on your
local network. 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.
For example, let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP
server (A in the example), port 80 to another (B in the example) and assign a
default server IP address of 192.168.1.35 to a third (C in the example). You
assign the LAN IP addresses and the ISP assigns the WAN IP address. The NAT
network appears as a single host on the Internet.
Figure 35 Multiple Servers Behind NAT Example
8.3.1 Port Forwarding Options
Click ADVANCED (
進階
) > NAT Configuration (NAT
設定
) > Port Forwarding
to look at the current port-forwarding rules in the WiMAX Modem, and to enable,