Chapter 37 System

Table 179 Configuration > System > DNS (continued)

LABEL

DESCRIPTION

#

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.

 

 

Service Control

This specifies from which computers and zones you can send DNS queries to the

 

ZyWALL.

 

 

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 ZyWALL 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 ZyWALL’s (non-configurable)

 

default policy. The ZyWALL 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 ZyWALL will not have to use the default policy.

 

 

Zone

This is the zone on the ZyWALL 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 ZyWALL accepts DNS queries from the computer with the IP

 

address specified above through the specified zone (Accept) or discards them (Deny).

 

 

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

37.6.4 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.

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ZyWALL 110/310/1100 Series User’s Guide