Chapter 44 System
ZyWALL USG Series User’s Guide
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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.
44.6.4 PTR Record
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.
44.6.5 Adding an (IPv6) Address/PTR Record
Click the Add icon in the Address/PTR Record or IPv6 Address/PTR Record table to add an IPv4 or IPv6
address/PTR record.
Figure 639 Configuration > System > DNS > Address/PTR Record Edit
The following table describes the labels in this screen.
44.6.6 CNAME Record
A Canonical Name Record or CNAME record is a type of resource record in the Domain Name System
(DNS) that specifies that the domain name is an alias of another, canonical domain name. This allows
users to set up a record for a domain name which translates to an IP address, in other words, the domain
name is an alias of another. This record also binds all the subdomains to the same IP address without
having to create a record for each, so when the IP address is changed, all subdomain’s IP address is
updated as well, with one edit to the record.
Table 368 Configuration > System > DNS > (IPv6) Address/PTR Record Edit
LABEL DESCRIPTION
FQDN Type a Fully-Qualified Domain Name (FQDN) of a server. An FQDN starts with a host name and
continues all the way up to the top-level 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. Underscores are not allowed.
Use "*." as a prefix in the FQDN for a wildcard domain name (for example, *.example.com).
IP Address Enter the IP address of the host in dotted decimal notation.
OK Click OK to save your customized settings and exit this screen.
Cancel Click Cancel to exit this screen without saving.
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