Ptr Record; Adding An Address/Ptr Record; Cname Record - ZyXEL Communications USG40 User Manual

33.6.4 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.

33.6.5 Adding an Address/PTR Record

Click the Add icon in the Address/PTR Record table to add an address/PTR record.
Figure 416 Configuration > System > DNS > Address/PTR Record Edit
The following table describes the labels in this screen.
Table 270 Configuration > System > DNS > Address/PTR Record Edit
LABEL
FQDN
IP Address
OK
Cancel

33.6.6 CNAME Record

A Canonical Name Record or CNAME record is a type of resource record in the Domain Name
System (DNS) that specifies that the domain name is an alias of another, canonical domain name.
This allows users to set up a record for a domain name which translates to an IP address, in other
words, the domain name is an alias of another. This record also binds all the subdomains to the
same IP address without having to create a record for each, so when the IP address is changed, all
subdomain's IP address is updated as well, with one edit to the record.
For example, the domain name zyxel.com is hooked up to a record named A which translates it to
11.22.33.444. You also have several subdomains, like mail.zyxel.com, ftp.zyxel.com and you want
this subdomain to point to your main domain zyxel.com. Edit the IP Address in record A and all
subdomains will follow automatically. This eliminates chances for errors and increases efficiency in
DNS management.
Chapter 33 System
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
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