ZyXEL 2WG Guida Utente

Chapter 22 DNS Screens

ZyWALL 2WG User’s Guide

First of all, you need to have registered a dynamic DNS account with www.dyndns.org. This is 
for people with a dynamic IP from their ISP or DHCP server that would still like to have a 
domain name. The Dynamic DNS service provider will give you a password or key. 

"

You must go to the Dynamic DNS service provider’s website and register a 
user account and a domain name before you can use the Dynamic DNS 
service with your ZyWALL.

Enabling the wildcard feature for your host causes *.yourhost.dyndns.org to be aliased to the 
same IP address as yourhost.dyndns.org. This feature is useful if you want to be able to use, 
for example, www.yourhost.dyndns.org and still reach your hostname.

"

If you have a private WAN IP address, then you cannot use Dynamic DNS.

IP

Select From ISP if your ISP dynamically assigns DNS server information (and 

the ZyWALL's WAN IP address). Use the drop-down list box to select a DNS 

server IP address that the ISP assigns in the field to the right. 
Select User-Defined if you have the IP address of a DNS server. Enter the 

DNS server's IP address in the field to the right. If you chose User-Defined, but 

leave the IP address set to 0.0.0.0, User-Defined changes to None after you 

click Apply. If you set a second choice to User-Defined, and enter the same IP 

address, the second User-Defined changes to None after you click Apply. 
Select DNS Relay to have the ZyWALL act as a DNS proxy. The ZyWALL's 

LAN, DMZ or WLAN IP address displays in the field to the right (read-only). The 

ZyWALL tells the DHCP clients on the LAN, DMZ or WLAN that the ZyWALL 

itself is the DNS server. When a computer on the LAN, DMZ or WLAN sends a 

DNS query to the ZyWALL, the ZyWALL forwards the query to the ZyWALL's 

system DNS server (configured in the DNS System screen) and relays the 

response back to the computer. You can only select DNS Relay for one of the 

three servers; if you select DNS Relay for a second or third DNS server, that 

choice changes to None after you click Apply. 
Select None if you do not want to configure DNS servers. You must have 

another DHCP sever on your LAN, or else the computers must have their DNS 

server addresses manually configured. If you do not configure a DNS server, 

you must know the IP address of a computer in order to access it.

Apply

Click Apply to save your changes back to the ZyWALL.

Reset

Click Reset to begin configuring this screen afresh.

Table 138   ADVANCED > DNS > DHCP