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Chapter 52 System
ISG50 User’s Guide
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52.6.4 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.
52.6.5 Adding an Address/PTR Record
Click the Add icon in the Address/PTR Record table to add an address/PTR record.
Figure 447 Configuration > System > DNS > Address/PTR Record Add
The following table describes the labels in this screen.
52.6.6 Domain Zone Forwarder
A domain zone forwarder contains a DNS server’s IP address. The ISG50 can query the DNS server
to resolve domain zones for features like VPN, DDNS and the time server. 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.
Table 270 Configuration > System > DNS > Address/PTR Record Add
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