ZyXEL Communications ISG50 User Manual

 Chapter 52 System

ISG50 User’s Guide

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.

Click the Add icon in the Address/PTR Record table to add an address/PTR record.

Configuration > System > DNS > Address/PTR Record Add

The following table describes the labels in this screen. 

 

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. 

Configuration > System > DNS > Address/PTR Record Add

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