Address Record; Ptr Record; Adding An Address/Ptr Record - ZyXEL Communications NXC2500 User Manual

Chapter 24 System

24.6.3 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 NXC allows you to configure address records about the NXC 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 NXC receives a DNS query for an FQDN for which the NXC has an address record,
the NXC can send the IP address in a DNS response without having to query a DNS name server.

24.6.4 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.

24.6.5 Adding an Address/PTR Record

Click the Add icon in the Address/PTR Record table to add an address/PTR record.
Figure 149 Configuration > System > DNS > Add Address/PTR Record
The following table describes the labels in this screen.
Table 135 Configuration > System > DNS > Add Address/PTR Record
LABEL
FQDN
IP Address
OK
Cancel
268
DESCRIPTION
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).
Enter the IP address of the host in dotted decimal notation.
Click OK to save your customized settings and exit this screen.
Click Cancel to exit this screen without saving
NXC2500 User's Guide