ZyXEL Communications Corporation P660HNT1AV2 Manuel D’Utilisation

Chapter 10 Network Address Translation (NAT)

P-660HN-Tx(A) v2 User’s Guide

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.

See 

 for advanced technical information on NAT.

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 ADSL Router.

Network Setting > NAT > General

The following table describes the labels in this screen.

Network Setting > NAT > General

Active

Select this check box to enable NAT.

Max NAT/Firewall 
Session Per User

When computers use peer to peer applications, such as file sharing applications, 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 ADSL 
Router.

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.

Cancel

Click this to restore your previously saved settings.