Chapter 11 Network Address Translation (NAT)
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 11.6 on page 153 for advanced technical information on NAT.
11.2 The NAT General Screen
Use this screen to activate NAT for the default WAN connection (PVC0). Click Network Setting > NAT to open the following screen.
Note: You must create an IP filter rule in addition to setting up NAT, to allow traffic from the WAN to be forwarded through the
Figure 69 Network Setting > NAT > General
The following table describes the labels in this screen.
Table 51 Network Setting > NAT > General
LABEL | DESCRIPTION |
Active | Select this check box to enable NAT. |
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Max NAT/Firewall | When computers use peer to peer applications, such as file sharing applications, they |
Session Per User | 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 |
| Series. |
| 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. |
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Apply | Click this to save your changes. |
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Cancel | Click this to restore your previously saved settings. |
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