ZyXEL Communications 100 Series User Manual

 Chapter 43 System

ZyWALL USG 100/200 Series User’s Guide

Click System > DNS to change your ZyWALL’s DNS settings. Use the DNS screen to 
configure the ZyWALL to use a DNS server to resolve domain names for ZyWALL system 
features like VPN, DDNS and the time server. You can also configure the ZyWALL to accept 
or discard DNS queries. Use the Network > Interface screens to configure the DNS server 
information that the ZyWALL sends to the specified DHCP client devices.

Figure 490   System > DNS

The following table describes the labels in this screen.  

Table 233   System > DNS

Address/PTR 
Record

This record specifies the mapping of a fully qualified domain name (FQDN) to an IP 
address. An FQDN consists of a host and domain name. For example, 
www.zyxel.com.tw is a fully qualified domain name, where “www” is the host, 
“zyxel” is the third-level domain, “com” is the second-level domain, and “tw” is the 
top level domain.

#

This is the index number of the address/PTR record.

FQDN

This is a host’s fully qualified domain name.

IP Address

This is the IP address of a host.

Add icon

Click the Add icon in the heading row to open a screen where you can add a new 
address/PTR record. Refer to 

 for information on the fields.

Click the Edit icon to go to the screen where you can edit the record.
Click the Delete icon to remove an existing record. A window display asking you to 
confirm that you want to delete the record. Note that subsequent records move up 
by one when you take this action.

Domain Zone 
Forwarder

This specifies a DNS server’s IP address. The ZyWALL can query the DNS server 
to resolve domain zones for features like VPN, DDNS and the time server.
When the ZyWALL needs to resolve a domain zone, it checks it against the domain 
zone forwarder entries in the order that they appear in this list. 

#

This is the index number of the domain zone forwarder record. The ordering of your 
rules is important as rules are applied in sequence. 
A hyphen (-) displays for the default domain zone forwarder record. The default 
record is not configurable. The ZyWALL uses this default record if the domain zone 
that needs to be resolved does not match any of the other domain zone forwarder 
records.