ZyXEL Communications ZyWALL5UTM 4.0 User Manual

ZyWALL 5/35/70 Series User’s Guide

Chapter 26 DNS

426

WAN Interface

Select the WAN port to use for updating the IP address of the domain name.

IP Address Update 

Policy

Select Use WAN IP Address to have the ZyWALL update the domain name 

with the WAN port's IP address.
Select Use User-Defined and enter the IP address if you have a static IP 

address.
Select Let DDNS Server Auto Detect only when there are one or more NAT 

routers between the ZyWALL and the DDNS server. This feature has the DDNS 

server automatically detect and use the IP address of the NAT router that has a 

public IP address.

Note: The DDNS server may not be able to detect the proper IP 

address if there is an HTTP proxy server between the 
ZyWALL and the DDNS server.

HA

Select this check box to enable the high availability (HA) feature. High 

availability has the ZyWALL update a domain name with another port’s IP 

address when the normal WAN port does not have a connection. 
If the WAN port specified in the WAN Interface field does not have a 

connection, the ZyWALL will attempt to use the IP address of another WAN port 

to update the domain name.
When the WAN ports are in the active/passive operating mode, the ZyWALL will 

update the domain name with the IP address of whichever WAN port has a 

connection, regardless of the setting in the WAN Interface field.
Disable this feature and the ZyWALL will only update the domain name with an 

IP address of the WAN port specified in the WAN Interface field. If that WAN 

port does not have a connection, the ZyWALL will not update the domain name 

with another port’s IP address.

Note: If you enable high availability, DDNS can also function 

when the ZyWALL uses the dial backup port. DDNS does 
not function when the ZyWALL uses traffic redirect.

Apply

Click Apply to save your changes back to the ZyWALL.

Reset

Click Reset to begin configuring this screen afresh.

Table 152   DDNS