Chapter 29 System
NXC Series User’s Guide
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The following table describes the labels in this screen.
Table 168 Configuration > System > DNS
LABEL DESCRIPTION
Address/PTR
Record
This record specifies 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.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.
Add Click this to create a new 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.
# This is the index number of the address/PTR record.
FQDN This is a host’s fully qualified domain name.
IP Address This is the IP address of a host.
Domain Zone
Forwarder
This specifies a DNS server’s IP address. The NXC can query the DNS server to resolve domain
zones for features like the time server.
When the NXC needs to resolve a domain zone, it checks it against the domain zone
forwarder entries in the order that they appear in this list.
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 is the index number of the domain zone forwarder record. The ordering of your rules is
important as rules are applied in sequence.
A hyphen (-) displays for the default domain zone forwarder record. The default record is not
configurable. The NXC uses this default record if the domain zone that needs to be resolved
does not match any of the other domain zone forwarder records.
Domain Zone 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.
A “*” means all domain zones.
Type This displays whether the DNS server IP address is assigned by the ISP dynamically through a
specified interface or configured manually (User-Defined).
DNS Server This is the IP address of a DNS server. This field displays N/A if you have the NXC get a DNS
server IP address from the ISP dynamically but the specified interface is not active.
Query Via This is the interface through which the NXC sends DNS queries to the entry’s DNS server.
MX Record (for My
FQDN)
A MX (Mail eXchange) record identifies a mail server that handles the mail for a particular
domain.
Add Click this to create a new 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.
# This is the index number of the MX record.
Domain Name This is the domain name where the mail is destined for.
IP/FQDN This is the IP address or Fully-Qualified Domain Name (FQDN) of a mail server that handles the
mail for the domain specified in the field above.
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