Chapter 29 System
NXC Series User’s Guide
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29.6.3 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.
29.6.4 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.
29.6.5 Adding an Address/PTR Record
Click the Add icon in the Address/PTR Record table to add an address/PTR record.
Service Control This specifies from which computers and zones you can send DNS queries to the NXC.
Add Click this to create a new entry. Select an entry and click Add to create a new entry after the
selected entry.
Edit Double-click an entry or select it and click Edit to be able to modify the entry’s settings.
Remove To remove an entry, select it and click Remove. The NXC confirms you want to remove it
before doing so. Note that subsequent entries move up by one when you take this action.
Move To change an entry’s position in the numbered list, select the method and click Move to
display a field to type a number for where you want to put it and press [ENTER] to move the
rule to the number that you typed.
# This the index number of the service control rule. The ordering of your rules is important as rules
are applied in sequence.
The entry with a hyphen (-) instead of a number is the NXC’s (non-configurable) default
policy. The NXC applies this to traffic that does not match any other configured rule. It is not
an editable rule. To apply other behavior, configure a rule that traffic will match so the NXC
will not have to use the default policy.
Zone This is the zone on the NXC the user is allowed or denied to access.
Address This is the object name of the IP address(es) with which the computer is allowed or denied to
send DNS queries.
Action This displays whether the NXC accepts DNS queries from the computer with the IP address
specified above through the specified zone (Accept) or discards them (Deny).
Table 168 Configuration > System > DNS (continued)
LABEL DESCRIPTION
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