ZyXEL Communications ZyWALL 300 User Manual
Chapter 43 System
ZyWALL USG 300 User’s Guide
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43.5.4 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.
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 allows you to configure address records about the ZyWALL 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 receives a DNS query for an FQDN for which
the ZyWALL has an address record, the ZyWALL can send the IP address in a DNS response
without having to query a DNS name server.
device. This way you can keep a record of DNS names and addresses that people on your
network may use frequently. If the ZyWALL receives a DNS query for an FQDN for which
the ZyWALL has an address record, the ZyWALL can send the IP address in a DNS response
without having to query a DNS name server.
43.5.5 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.
mapping of an IP address to a domain name.
43.5.6 Adding an Address/PTR Record
Click the Add icon in the Address/PTR Record table to add an address/PTR record.
Figure 421 System > DNS > Address/PTR Record Edit
The following table describes the labels in this screen.
Table 201 System > DNS > 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.
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.
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