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Chapter 8 NAT
P-2304R-P1 Series User’s Guide
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Each field is described in the following table.
8.2.2 NAT Port Forwarding Screen
Use this screen to look at the current port-forwarding rules in the ZyXEL Device, and to
enable, disable, activate, and deactivate each one. You can also set up a default server to
handle ports not covered by rules. To access this screen, click Network > NAT > Port
Forwarding.
Table 41 Network > NAT > General
LABEL DESCRIPTION
NAT Setup
Enable Network
Address
Translation
Select this if you want to use port forwarding, trigger ports, or any of the ALG. The
more features you enable, the more memory you should allocate in Max NAT/
Firewall Session Per User.
Max NAT/Firewall
Session Per User
Select the maximum number of NAT rules and firewall rules the ZyXEL Device
enforces at one time. The ZyXEL Device automatically allocates memory for the
maximum number of rules, regardless of whether or not there is a rule to enforce.
This is the same number you enter in Security > Firewall > General.
When computers use peer to peer applications, such as file sharing applications,
they may use a large number of NAT sessions. If you do not limit the number of
NAT sessions a single client can establish, this can result in all of the available
NAT sessions being used. In this case, no additional NAT sessions can be
established, and users may not be able to access the Internet.
Each NAT session establishes a corresponding firewall session. Use this field to
limit the number of NAT/firewall sessions each client computer can establish
through the ZyXEL Device.
If your network has a small number of clients using peer to peer applications, you
can raise this number to ensure that their performance is not degraded by the
number of NAT sessions they can establish. If your network has a large number of
users using peer to peer applications, you can lower this number to ensure no
single client is using all of the available NAT sessions.
Apply
Click this to save your changes and to apply them to the ZyXEL Device.
Reset Click this to set every field in this screen to its last-saved value.