Chapter 8 Network Address Translation (NAT)
The following table describes the labels in this screen.
Table 44 Network > NAT > General
LABEL | DESCRIPTION |
Active Network | Select this check box to enable NAT. |
Address |
|
Translation (NAT) |
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|
SUA Only | Select this radio button if you have just one public WAN IP address for your ZyXEL |
| Device. |
|
|
Full Feature | Select this radio button if you have multiple public WAN IP addresses for your |
| ZyXEL Device. |
|
|
Max NAT/Firewall | When computers use peer to peer applications, such as file sharing applications, |
Session Per User | they need to establish 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 client computers 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 exhausting all of the available NAT sessions. |
|
|
Apply | Click this to save your changes. |
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|
Cancel | Click this to restore your previously saved settings. |
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8.3The Port Forwarding Screen
"This screen is available only when you select SUA only in the NAT > General screen.
Use this 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. You can allocate a server IP address that corresponds to a port or a range of ports.
The most often used port numbers and services are shown in Appendix E on page 373. Please refer to RFC 1700 for further information about port numbers.
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