Chapter 45 System

Table 213 Configuration > System > DNS (continued)

LABEL

DESCRIPTION

DNS Server

This is the IP address of a DNS server. This field displays N/A if you

 

have the ZyWALL 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 ZyWALL sends DNS queries to

 

the entry’s DNS server. If the ZyWALL connects through a VPN tunnel,

 

tunnel displays.

 

 

MX Record (for

A MX (Mail eXchange) record identifies a mail server that handles the

My FQDN)

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 ZyWALL 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.

 

 

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).

 

 

684

 

ZyWALL USG 50 User’s Guide