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7.4 NAT General Setup
You must create a firewall rule in addition to setting up SUA/NAT, to allow traffic from the
WAN to be forwarded through the ZyXEL Device. Click Network > NAT to open the
following screen. Not all fields are available on all models.
Figure 52 NAT General
The following table describes the labels in this screen.
Table 28 NAT General
LABEL
Active
Network
Address
Translation
(NAT)
SUA Only
Full Feature
Max NAT/
Firewall
Session Per
User
Enable SIP
ALG
Apply
Cancel
P-660H-Tx v2 User's Guide
Chapter 7 Network Address Translation (NAT) Screens
DESCRIPTION
Select this check box to enable NAT.
Select this radio button if you have just one public WAN IP address for your ZyXEL
Device.
Select this radio button if you have multiple public WAN IP addresses for your ZyXEL
Device.
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 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.
Select this to make sure SIP (VoIP) works correctly with port-forwarding and port-
triggering rules.
Click Apply to save your changes to the ZyXEL Device.
Click Cancel to reload the previous configuration for this screen.
101
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Troubleshooting
