ZyXEL Communications VMG1312-T10C, User Manual

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Chapter 10 Network Address Translation (NAT)
VMG1312-T10C User’s Guide
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Port Forwarding
A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP,
that you can make visible to the outside world even though NAT makes your whole inside network
appear as a single computer to the outside world.
Finding Out More
See Section 10.6 on page 136 for advanced technical information on NAT.
10.2 The General Screen
Use the General screen to limit the number of concurrent NAT sessions each client can use.
Click Network Setting > NAT > General to display the following screen.
Figure 87
Network Setting > NAT > General
The following table describes the fields in this screen.
10.3 The Port Forwarding Screen
Use the Port Forwarding screen to forward incoming service requests to the servers 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
Table 47
Network Setting > NAT > General
LABEL DESCRIPTION
Max NAT/
Firewall Session
Per User Use this field to set a common limit to the number of concurrent NAT sessions each client
computer can have.
If only a few clients use peer to peer applications, you can raise this number to improve
their performance. With heavy peer to peer application use, lower this number to ensure no
single client uses too many of the available NAT sessions.
Apply Click Apply to save your changes.
Cancel Click Cancel to restore your previously saved settings.