Chapter 24 System
USG FLEX H Series User’s Guide
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24.4.3 Address/PTR Record
An address record contains the mapping of a Fully-Qualified Domain Name (FQDN) to an IP address.
The Zyxel Device allows you to configure address records about the Zyxel Device itself or another
device. This way you can keep a record of DNS names and addresses that people on your network may
use frequently. If the Zyxel Device receives a DNS query for an FQDN for which the Zyxel Device has an
address record, the Zyxel Device can send the IP address in a DNS response without having to query a
DNS name server.
A PTR (pointer) record is also called a reverse record or a reverse lookup record. It is a mapping of an IP
address to a domain name.
24.4.4 Adding an Address/PTR Record
Click the Add icon in the Address/PTR Record table to add an IPv4 address/PTR record.
Move To change an entry’s position in the numbered list, select the method and click Move to
display a field to type a number for where you want to put it and press [ENTER] to move the
rule to the number that you typed.
Priority 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 Zyxel Device uses this default record if the domain zone that needs to be
resolved does not match any of the other domain zone forwarder records.
Domain A domain zone is a fully qualified domain name without the host. For example, zyxel.com.tw
is the domain zone for the www.zyxel.com.tw fully qualified domain name.
A “*” means all domain zones.
Type This displays whether the DNS server IP address is assigned by the ISP dynamically through a
specified interface or configured manually (User-defined).
DNS Server This is the IP address of a DNS server. This field displays N/A if you have the Zyxel Device get a
DNS server IP address from the ISP dynamically but the specified interface is not active.
Query Via This is the interface through which the Zyxel Device sends DNS queries to the entry’s DNS
server. If the Zyxel Device connects through a VPN tunnel, tunnel displays.
Security Option
Control
Click the arrow in the Advanced Settings field to display this part of the screen. There are two
control policies: Default Action and Customize Action.
Query
Recursion
This displays if the Zyxel Device is allowed or denied to forward DNS client requests to DNS
servers for resolution.
Additional Info
from Cache
This displays if the Zyxel Device is allowed or denied to cache Resource Records (RR)
obtained from previous DNS queries.
Source Address These are the object addresses used in the control policy. RFC1918 refers to private IP address
ranges. It can be modified in Object > Address.
Table 179 System > DNS (continued)& DDNS > DNS
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