Chapter 43 System
ZyWALL/USG Series User’s Guide
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43.6.3 (IPv6) Address Record
An address record contains 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 is a fully
qualified domain name, where “www” is the host, “zyxel” is the second-level domain, and “com” is
the top level domain. mail.myZyXEL.com.tw is also a FQDN, where “mail” is the host, “myZyXEL” is
the third-level domain, “com” is the second-level domain, and “tw” is the top level domain.
The ZyWALL/USG allows you to configure address records about the ZyWALL/USG 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 ZyWALL/USG receives a DNS query for an FQDN for which the ZyWALL/
USG has an address record, the ZyWALL/USG can send the IP address in a DNS response without
having to query a DNS name server.
43.6.4 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.
43.6.5 Adding an (IPv6) Address/PTR Record
Click the Add icon in the Address/PTR Record or IPv6 Address/PTR Recordtable to add an
IPv4 or IPv6 address/PTR record.
Figure 576 Configuration > System > DNS > Address/PTR Record Edit
# This the index number of the service control rule. The ordering of your rules is important
as rules are applied in sequence.
The entry with a hyphen (-) instead of a number is the ZyWALL/USG’s (non-configurable)
default policy. The ZyWALL/USG applies this to traffic that does not match any other
configured rule. It is not an editable rule. To apply other behavior, configure a rule that
traffic will match so the ZyWALL/USG will not have to use the default policy.
Zone This is the zone on the ZyWALL/USG the user is allowed or denied to access.
Address This is the object name of the IP address(es) with which the computer is allowed or
denied to send DNS queries.
Action This displays whether the ZyWALL/USG accepts DNS queries from the computer with the
IP address specified above through the specified zone (Accept) or discards them
(Deny).
Table 349 Configuration > System > DNS (continued)
LABEL DESCRIPTION
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