ZyXEL Communications P-2304R-P1 Series Manuel D’Utilisation

Chapter 8 NAT

P-2304R-P1 Series User’s Guide

Each field is described in the following table.

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

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.